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href="https://web.archive.org/web/20210121173734/mailto:/?subject=Implementing%20leader%20election%20on%20Google%20Cloud%20Storage&body=Check%20out%20this%20article%20on%20the%20Cloud%20Blog:%0A%0AImplementing%20leader%20election%20on%20Google%20Cloud%20Storage%0A%0AControlling%20coordination%20among%20distributed%20systems%20can%20be%20complex.%20This%20article%20showcases%20how%20to%20build%20your%20own%20leader%20election%20system%20using%20only%20Google%20Cloud%20Storage.%0A%0Ahttps://cloud.google.com/blog/topics/developers-practitioners/implementing-leader-election-google-cloud-storage/"><svg aria-hidden="true" class="h-c-icon h-c-icon--social h-c-icon--30px" viewbox="0 0 30 30"><use xlink:href="/web/20210121173734im_/https://cloud.google.com/blog/#social-mail" xmlns:xlink="http://www.w3.org/1999/xlink"></use></svg></a></nav></div></div></article-sticky-share-block><section class="uni-container"><div class="uni-wrapper"><div class="uni-content uni-blog-article-container uni-tombstone"><article-content-stream-block class="ng-star-inserted"><div class="ng-star-inserted"><div class="module--text h-c-page ng-star-inserted"><div class="h-c-grid"><div class="uni-paragraph h-c-grid__col h-c-grid__col--8 h-c-grid__col-m--6 h-c-grid__col-l--6 h-c-grid__col--offset-2 h-c-grid__col-m--offset-3 h-c-grid__col-l--offset-3"><paragraph-block _nghost-c77="" class="ng-star-inserted"><div _ngcontent-c77="" class="rich-text" innerhtml="<p>Leader election is a commonly applied pattern for implementing distributed systems. For example, replicated relational databases such as MySQL, or distributed key-value stores such as Apache Zookeeper, choose a leader (sometimes referred to as master) among the replicas. All write operations go through the leader, so only a single node is writing to the system at any time. This is done to ensure no writes are lost and the database is not corrupted.</p><p>It can be challenging to choose a leader among the nodes of a distributed system due to the nature of networked systems and time synchronization. In this article, we&#8217;ll discuss why you need leader election (or more generally, &#34;distributed locks&#34;), explain why they are difficult to implement, and provide an example implementation that uses a strongly consistent storage system, in this case Google Cloud Storage.</p><h3>Why do we need distributed locks?</h3><p>Imagine a multithreaded program where each thread is interacting with a shared variable or data structure. To prevent data loss or corrupting the data structure, multiple threads should block and wait on each other while modifying the state. We ensure this with mutexes in a single-process application. Distributed locks are no different in this regard than mutexes in single-process systems.</p><p>A distributed system working on shared data still needs a locking mechanism to safely take turns while modifying shared data. However, we no longer have the notion of mutexes while working in a distributed environment. This is where distributed locks and leader elections come into the picture.</p><h3>Use cases for leader election</h3><p>Typically leader election is used to ensure exclusive access by a single node to shared data, or to ensure a single node coordinates the work in a system.</p><p>For replicated database systems such as MySQL, Apache Zookeeper, or Cassandra, we need to make sure only one &#34;leader&#34; exists at any given time. All writes go through this leader to ensure writes happen in one place. Meanwhile, the reads can be served from the follower nodes.</p><p>Here&#8217;s another example. You have three nodes for an application that consumes messages from a message queue; however, only one of these nodes is to process messages at any time. By choosing a leader, you can appoint a node to fulfill that responsibility. If the leader becomes unavailable, other nodes can take over and continue the work. In this case, a leader election is needed to coordinate the work.</p><p>Many distributed systems take advantage of leader election or distributed lock patterns. However, choosing a leader is a nontrivial problem.</p><h3>Why is distributed locking difficult?</h3><p>Distributed systems are like threads of a single-process program, except they are on different machines and they talk to each other over the network (which can be unreliable). As a result, they cannot rely on mutexes or similar locking mechanisms that use atomic CPU instructions and shared memory to implement the lock.</p><p>The distributed locking problem requires the participants to agree on who is holding the lock. We also expect a leader to be elected while some nodes in the system are unavailable. This may sound simple, but implementing such a system correctly can be quite difficult, in part due to the many edge cases. This is where distributed consensus algorithms come into the picture.</p><p>To implement distributed locking, you need a <a href="https://en.wikipedia.org/wiki/Strong_consistency" target="_blank">strongly consistent</a> system to decide which node holds the lock. Because this must be an atomic operation, it requires <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)" target="_blank">consensus protocols</a> such as <a href="https://en.wikipedia.org/wiki/Paxos_(computer_science)" target="_blank">Paxos</a>, <a href="https://en.wikipedia.org/wiki/Raft_(algorithm)" target="_blank">Raft</a>, or the <a href="https://en.wikipedia.org/wiki/Two-phase_commit_protocol" target="_blank">two-phase commit</a> protocol. However, implementing these algorithms correctly is quite difficult, as the implementations must be extensively tested and formally proved. Furthermore, the theoretical properties of these algorithms often fail to withstand real-world conditions, which has led to <a href="https://www.hashicorp.com/blog/making-gossip-more-robust-with-lifeguard" target="_blank">more advanced research</a> on the topic.</p><p>At Google, we achieve distributed locking using a service called <a href="https://static.googleusercontent.com/media/research.google.com/en//archive/chubby-osdi06.pdf" target="_blank">Chubby</a>. Across our stack, Chubby helps many teams at Google make use of distributed consensus without having to worry about implementing a locking service from scratch (and doing so correctly).</p><h3>Cheating a bit: Leveraging other storage primitives</h3><p>Instead of implementing your own consensus protocol, you can easily take advantage of a <a href="https://en.wikipedia.org/wiki/Strong_consistency" target="_blank">strongly consistent</a> storage system that provides the same guarantees through a single key or record. By delegating the responsibility for atomicity to an external storage system, we no longer need the participating nodes to form a quorum and vote on a new leader.</p><p>For example, a distributed database record (or file) can be used to name the current leader, and when the leader has renewed its leadership lock. If there's no leader in the record, or the leader has not renewed its lock, other nodes can run for election by attempting to write their name to the record. First one to come will win, because this record or file allows atomic writes.</p><p>Such atomic writes on files or database records are typically implemented using <a href="https://en.wikipedia.org/wiki/Optimistic_concurrency_control" target="_blank">optimistic concurrency control</a>, which lets you atomically update the record by providing its version number (if the record has changed since then, the write will be rejected). Similarly, the writes become immediately available to any readers. Using these two primitives (atomic updates and consistent reads), we can implement a leader election on top of any storage system.</p><p>In fact, many Google Cloud storage products, such as <a href="https://cloud.google.com/storage">Cloud Storage</a> and <a href="https://cloud.google.com/spanner">Cloud Spanner</a>, can be used to implement such a distributed lock. Similarly, open source storage systems like <a href="https://zookeeper.apache.org/" target="_blank">Zookeeper</a> (Paxos), <a href="https://etcd.io/" target="_blank">etcd</a> (Raft), <a href="https://www.consul.io/" target="_blank">Consul</a> (Raft), or even properly configured RDBMS systems like MySQL or PostgreSQL can provide the needed primitives.</p><h3>Example: Leader election with Cloud Storage</h3><p>We can implement leader election using a single object (file) on <a href="https://cloud.google.com/storage">Cloud Storage</a> that contains the leader data, and require each node to read that file, or run for election based on the file. In this setup, the leader must renew its leadership by updating this file with its heartbeat.</p><p>My colleague <a href="https://twitter.com/sethvargo" target="_blank">Seth Vargo</a> published such a leader election implementation &#8211; written in Go and using Cloud Storage &#8211; <a href="https://godoc.org/github.com/hashicorp/vault/physical/gcs" target="_blank">as a package</a> within the HashiCorp Vault project. (Vault also has a leader election on top of <a href="https://godoc.org/github.com/hashicorp/vault/physical" target="_blank">other storage backends</a>).</p><p>To implement leader election among distributed nodes of our application in Go, we can write a program that makes use of this package in just 50 lines of code:</p>"><p>Leader election is a commonly applied pattern for implementing distributed systems. For example, replicated relational databases such as MySQL, or distributed key-value stores such as Apache Zookeeper, choose a leader (sometimes referred to as master) among the replicas. All write operations go through the leader, so only a single node is writing to the system at any time. This is done to ensure no writes are lost and the database is not corrupted.</p><p>It can be challenging to choose a leader among the nodes of a distributed system due to the nature of networked systems and time synchronization. In this article, we’ll discuss why you need leader election (or more generally, "distributed locks"), explain why they are difficult to implement, and provide an example implementation that uses a strongly consistent storage system, in this case Google Cloud Storage.</p><h3>Why do we need distributed locks?</h3><p>Imagine a multithreaded program where each thread is interacting with a shared variable or data structure. To prevent data loss or corrupting the data structure, multiple threads should block and wait on each other while modifying the state. We ensure this with mutexes in a single-process application. Distributed locks are no different in this regard than mutexes in single-process systems.</p><p>A distributed system working on shared data still needs a locking mechanism to safely take turns while modifying shared data. However, we no longer have the notion of mutexes while working in a distributed environment. This is where distributed locks and leader elections come into the picture.</p><h3>Use cases for leader election</h3><p>Typically leader election is used to ensure exclusive access by a single node to shared data, or to ensure a single node coordinates the work in a system.</p><p>For replicated database systems such as MySQL, Apache Zookeeper, or Cassandra, we need to make sure only one "leader" exists at any given time. All writes go through this leader to ensure writes happen in one place. Meanwhile, the reads can be served from the follower nodes.</p><p>Here’s another example. You have three nodes for an application that consumes messages from a message queue; however, only one of these nodes is to process messages at any time. By choosing a leader, you can appoint a node to fulfill that responsibility. If the leader becomes unavailable, other nodes can take over and continue the work. In this case, a leader election is needed to coordinate the work.</p><p>Many distributed systems take advantage of leader election or distributed lock patterns. However, choosing a leader is a nontrivial problem.</p><h3>Why is distributed locking difficult?</h3><p>Distributed systems are like threads of a single-process program, except they are on different machines and they talk to each other over the network (which can be unreliable). As a result, they cannot rely on mutexes or similar locking mechanisms that use atomic CPU instructions and shared memory to implement the lock.</p><p>The distributed locking problem requires the participants to agree on who is holding the lock. We also expect a leader to be elected while some nodes in the system are unavailable. This may sound simple, but implementing such a system correctly can be quite difficult, in part due to the many edge cases. This is where distributed consensus algorithms come into the picture.</p><p>To implement distributed locking, you need a <a href="https://web.archive.org/web/20210121173734/https://en.wikipedia.org/wiki/Strong_consistency" target="_blank">strongly consistent</a> system to decide which node holds the lock. Because this must be an atomic operation, it requires <a href="https://web.archive.org/web/20210121173734/https://en.wikipedia.org/wiki/Consensus_(computer_science)" target="_blank">consensus protocols</a> such as <a href="https://web.archive.org/web/20210121173734/https://en.wikipedia.org/wiki/Paxos_(computer_science)" target="_blank">Paxos</a>, <a href="https://web.archive.org/web/20210121173734/https://en.wikipedia.org/wiki/Raft_(algorithm)" target="_blank">Raft</a>, or the <a href="https://web.archive.org/web/20210121173734/https://en.wikipedia.org/wiki/Two-phase_commit_protocol" target="_blank">two-phase commit</a> protocol. However, implementing these algorithms correctly is quite difficult, as the implementations must be extensively tested and formally proved. Furthermore, the theoretical properties of these algorithms often fail to withstand real-world conditions, which has led to <a href="https://web.archive.org/web/20210121173734/https://www.hashicorp.com/blog/making-gossip-more-robust-with-lifeguard" target="_blank">more advanced research</a> on the topic.</p><p>At Google, we achieve distributed locking using a service called <a href="https://web.archive.org/web/20210121173734/https://static.googleusercontent.com/media/research.google.com/en//archive/chubby-osdi06.pdf" target="_blank">Chubby</a>. Across our stack, Chubby helps many teams at Google make use of distributed consensus without having to worry about implementing a locking service from scratch (and doing so correctly).</p><h3>Cheating a bit: Leveraging other storage primitives</h3><p>Instead of implementing your own consensus protocol, you can easily take advantage of a <a href="https://web.archive.org/web/20210121173734/https://en.wikipedia.org/wiki/Strong_consistency" target="_blank">strongly consistent</a> storage system that provides the same guarantees through a single key or record. By delegating the responsibility for atomicity to an external storage system, we no longer need the participating nodes to form a quorum and vote on a new leader.</p><p>For example, a distributed database record (or file) can be used to name the current leader, and when the leader has renewed its leadership lock. If there's no leader in the record, or the leader has not renewed its lock, other nodes can run for election by attempting to write their name to the record. First one to come will win, because this record or file allows atomic writes.</p><p>Such atomic writes on files or database records are typically implemented using <a href="https://web.archive.org/web/20210121173734/https://en.wikipedia.org/wiki/Optimistic_concurrency_control" target="_blank">optimistic concurrency control</a>, which lets you atomically update the record by providing its version number (if the record has changed since then, the write will be rejected). Similarly, the writes become immediately available to any readers. Using these two primitives (atomic updates and consistent reads), we can implement a leader election on top of any storage system.</p><p>In fact, many Google Cloud storage products, such as <a href="https://web.archive.org/web/20210121173734/https://cloud.google.com/storage">Cloud Storage</a> and <a href="https://web.archive.org/web/20210121173734/https://cloud.google.com/spanner">Cloud Spanner</a>, can be used to implement such a distributed lock. Similarly, open source storage systems like <a href="https://web.archive.org/web/20210121173734/https://zookeeper.apache.org/" target="_blank">Zookeeper</a> (Paxos), <a href="https://web.archive.org/web/20210121173734/https://etcd.io/" target="_blank">etcd</a> (Raft), <a href="https://web.archive.org/web/20210121173734/https://www.consul.io/" target="_blank">Consul</a> (Raft), or even properly configured RDBMS systems like MySQL or PostgreSQL can provide the needed primitives.</p><h3>Example: Leader election with Cloud Storage</h3><p>We can implement leader election using a single object (file) on <a href="https://web.archive.org/web/20210121173734/https://cloud.google.com/storage">Cloud Storage</a> that contains the leader data, and require each node to read that file, or run for election based on the file. In this setup, the leader must renew its leadership by updating this file with its heartbeat.</p><p>My colleague <a href="https://web.archive.org/web/20210121173734/https://twitter.com/sethvargo" target="_blank">Seth Vargo</a> published such a leader election implementation – written in Go and using Cloud Storage – <a href="https://web.archive.org/web/20210121173734/https://godoc.org/github.com/hashicorp/vault/physical/gcs" target="_blank">as a package</a> within the HashiCorp Vault project. (Vault also has a leader election on top of <a href="https://web.archive.org/web/20210121173734/https://godoc.org/github.com/hashicorp/vault/physical" target="_blank">other storage backends</a>).</p><p>To implement leader election among distributed nodes of our application in Go, we can write a program that makes use of this package in just 50 lines of code:</p></div></paragraph-block></div></div></div></div><div class="ng-star-inserted"><div class="module--text h-c-page ng-star-inserted"><div class="h-c-grid"><div class="uni-paragraph h-c-grid__col h-c-grid__col--8 h-c-grid__col-m--6 h-c-grid__col-l--6 h-c-grid__col--offset-2 h-c-grid__col-m--offset-3 h-c-grid__col-l--offset-3"><article-code-block _nghost-c78="" class="ng-star-inserted"><pre _ngcontent-c78=""> <code _ngcontent-c78="" class="ng-star-inserted">import ( </code><code _ngcontent-c78="" class="ng-star-inserted"> "context" </code><code _ngcontent-c78="" class="ng-star-inserted"> </code><code _ngcontent-c78="" class="ng-star-inserted"> log "github.com/hashicorp/go-hclog" </code><code _ngcontent-c78="" class="ng-star-inserted"> "github.com/hashicorp/vault/physical/gcs" </code><code _ngcontent-c78="" class="ng-star-inserted"> "github.com/hashicorp/vault/sdk/physical" </code><code _ngcontent-c78="" class="ng-star-inserted">) </code><code _ngcontent-c78="" class="ng-star-inserted"> </code><code _ngcontent-c78="" class="ng-star-inserted">const ( </code><code _ngcontent-c78="" class="ng-star-inserted"> bucketName = "YOUR_GCS_BUCKET_NAME" </code><code _ngcontent-c78="" class="ng-star-inserted"> leadershipFile = "leader.txt" </code><code _ngcontent-c78="" class="ng-star-inserted">) </code><code _ngcontent-c78="" class="ng-star-inserted"> </code><code _ngcontent-c78="" class="ng-star-inserted">func main() { </code><code _ngcontent-c78="" class="ng-star-inserted"> logger := log.Default() </code><code _ngcontent-c78="" class="ng-star-inserted"> b, err := gcs.NewBackend(map[string]string{ </code><code _ngcontent-c78="" class="ng-star-inserted"> "bucket": bucketName, </code><code _ngcontent-c78="" class="ng-star-inserted"> "ha_enabled": "true", </code><code _ngcontent-c78="" class="ng-star-inserted"> }, logger) </code><code _ngcontent-c78="" class="ng-star-inserted"> if err != nil { </code><code _ngcontent-c78="" class="ng-star-inserted"> panic(err) </code><code _ngcontent-c78="" class="ng-star-inserted"> } </code><code _ngcontent-c78="" class="ng-star-inserted"> haBackend, ok := b.(physical.HABackend) </code><code _ngcontent-c78="" class="ng-star-inserted"> if !ok { </code><code _ngcontent-c78="" class="ng-star-inserted"> panic("type casting failed") </code><code _ngcontent-c78="" class="ng-star-inserted"> } </code><code _ngcontent-c78="" class="ng-star-inserted"> </code><code _ngcontent-c78="" class="ng-star-inserted"> ctx, cancel := context.WithCancel(context.Background()) </code><code _ngcontent-c78="" class="ng-star-inserted"> defer cancel() </code><code _ngcontent-c78="" class="ng-star-inserted"> </code><code _ngcontent-c78="" class="ng-star-inserted"> for { </code><code _ngcontent-c78="" class="ng-star-inserted"> lock, err := haBackend.LockWith(leadershipFile, "ignored") </code><code _ngcontent-c78="" class="ng-star-inserted"> if err != nil { </code><code _ngcontent-c78="" class="ng-star-inserted"> panic(err) </code><code _ngcontent-c78="" class="ng-star-inserted"> } </code><code _ngcontent-c78="" class="ng-star-inserted"> </code><code _ngcontent-c78="" class="ng-star-inserted"> logger.Info("running for LEADERSHIP") </code><code _ngcontent-c78="" class="ng-star-inserted"> doneCh, err := lock.Lock(ctx.Done()) </code><code _ngcontent-c78="" class="ng-star-inserted"> if err != nil { </code><code _ngcontent-c78="" class="ng-star-inserted"> panic(err) </code><code _ngcontent-c78="" class="ng-star-inserted"> } </code><code _ngcontent-c78="" class="ng-star-inserted"> logger.Info("elected as LEADER") </code><code _ngcontent-c78="" class="ng-star-inserted"> <-doneCh </code><code _ngcontent-c78="" class="ng-star-inserted"> logger.Info("lost LEADERSHIP") </code><code _ngcontent-c78="" class="ng-star-inserted"> if err := lock.Unlock(); err != nil { </code><code _ngcontent-c78="" class="ng-star-inserted"> panic(err) </code><code _ngcontent-c78="" class="ng-star-inserted"> } </code><code _ngcontent-c78="" class="ng-star-inserted"> } </code><code _ngcontent-c78="" class="ng-star-inserted">}</code> </pre></article-code-block></div></div></div></div><div class="ng-star-inserted"><div class="module--text h-c-page ng-star-inserted"><div class="h-c-grid"><div class="uni-paragraph h-c-grid__col h-c-grid__col--8 h-c-grid__col-m--6 h-c-grid__col-l--6 h-c-grid__col--offset-2 h-c-grid__col-m--offset-3 h-c-grid__col-l--offset-3"><paragraph-block _nghost-c77="" class="ng-star-inserted"><div _ngcontent-c77="" class="rich-text" innerhtml="<p>This example program creates a lock using a file in Cloud Storage, and continually runs for election.</p><p>In this example, the <code>Lock()</code> call blocks until the calling program becomes a leader (or the context is cancelled). This call may block indefinitely since there might be another leader in the system.</p><p>If a process is elected as the leader, the library periodically sends heartbeats keeping the lock active. The leader then must finish work and give up the lock by calling the <code>Unlock()</code> method. If the leader loses the leadership, the <code>doneCh</code> channel will receive a message and the process can tell that it has lost the lock, as there might be a new leader.</p><p>Fortunately for us, the library we're using implements a heartbeat mechanism to ensure the elected leader remains available and active. If the elected leader fails abruptly without giving up the lock, after the TTL (time-to-live) on the lock expires, the remaining nodes then select a new leader, ensuring the overall system's availability.</p><p>Fortunately, this library implements the mentioned details around sending so-called periodic heartbeats, or how frequently the followers should check if the leader has died and if they should run for election. Similarly, the library employs various optimizations via storing the leadership data in <a href="https://cloud.google.com/storage/docs/metadata">object metadata</a> instead of object contents, which is costlier to read frequently.</p><p>If you need to ensure coordination between your nodes, using leader election in your distributed systems can help you safely achieve there's at most one node that has this responsibility. Using Cloud Storage or other strongly consistent systems, you can implement your own leader election. However, make sure you are aware of all the corner cases before implementing a new such library.</p><p>Further reading:</p><a href="https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank"></a><ul><a href="https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank"></a><a href="https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank"></a><li><a href="https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank"></a><a href="https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank"></a><a href="https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank">Implementing leader election using Kubernetes API</a></li><li><a href="https://aws.amazon.com/builders-library/leader-election-in-distributed-systems/" target="_blank">Leader election in distributed systems - AWS Builders Library</a></li><li><a href="https://docs.microsoft.com/en-us/azure/architecture/patterns/leader-election" target="_blank">Leader election -&#160; Azure Design Patterns Library</a></li><li><a href="https://kubernetespodcast.com/episode/123-leader-election/" target="_blank">Kubernetes Leader Election on Kubernetes Podcast</a><br></li></ul><p>Thanks to <a href="https://twitter.com/sethvargo" target="_blank">Seth Vargo</a> for reading drafts of this article. You can follow me <a href="https://twitter.com/ahmetb" target="_blank">on Twitter</a>.</p>"><p>This example program creates a lock using a file in Cloud Storage, and continually runs for election.</p><p>In this example, the <code>Lock()</code> call blocks until the calling program becomes a leader (or the context is cancelled). This call may block indefinitely since there might be another leader in the system.</p><p>If a process is elected as the leader, the library periodically sends heartbeats keeping the lock active. The leader then must finish work and give up the lock by calling the <code>Unlock()</code> method. If the leader loses the leadership, the <code>doneCh</code> channel will receive a message and the process can tell that it has lost the lock, as there might be a new leader.</p><p>Fortunately for us, the library we're using implements a heartbeat mechanism to ensure the elected leader remains available and active. If the elected leader fails abruptly without giving up the lock, after the TTL (time-to-live) on the lock expires, the remaining nodes then select a new leader, ensuring the overall system's availability.</p><p>Fortunately, this library implements the mentioned details around sending so-called periodic heartbeats, or how frequently the followers should check if the leader has died and if they should run for election. Similarly, the library employs various optimizations via storing the leadership data in <a href="https://web.archive.org/web/20210121173734/https://cloud.google.com/storage/docs/metadata">object metadata</a> instead of object contents, which is costlier to read frequently.</p><p>If you need to ensure coordination between your nodes, using leader election in your distributed systems can help you safely achieve there's at most one node that has this responsibility. Using Cloud Storage or other strongly consistent systems, you can implement your own leader election. However, make sure you are aware of all the corner cases before implementing a new such library.</p><p>Further reading:</p><a href="https://web.archive.org/web/20210121173734/https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank"></a><ul><a href="https://web.archive.org/web/20210121173734/https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank"></a><a href="https://web.archive.org/web/20210121173734/https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank"></a><li><a href="https://web.archive.org/web/20210121173734/https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank"></a><a href="https://web.archive.org/web/20210121173734/https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank"></a><a href="https://web.archive.org/web/20210121173734/https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/" target="_blank">Implementing leader election using Kubernetes API</a></li><li><a href="https://web.archive.org/web/20210121173734/https://aws.amazon.com/builders-library/leader-election-in-distributed-systems/" target="_blank">Leader election in distributed systems - AWS Builders Library</a></li><li><a href="https://web.archive.org/web/20210121173734/https://docs.microsoft.com/en-us/azure/architecture/patterns/leader-election" target="_blank">Leader election -  Azure Design Patterns Library</a></li><li><a href="https://web.archive.org/web/20210121173734/https://kubernetespodcast.com/episode/123-leader-election/" target="_blank">Kubernetes Leader Election on Kubernetes Podcast</a><br></li></ul><p>Thanks to <a href="https://web.archive.org/web/20210121173734/https://twitter.com/sethvargo" target="_blank">Seth Vargo</a> for reading drafts of this article. You can follow me <a href="https://web.archive.org/web/20210121173734/https://twitter.com/ahmetb" target="_blank">on Twitter</a>.</p></div></paragraph-block><span class="tombstone ng-star-inserted"></span></div></div></div></div></article-content-stream-block><article-tag-list-block class="ng-star-inserted"><div class="uni-blog-article-tags ng-star-inserted"><div class="h-c-page"><div class="h-c-grid"><div class="h-c-grid__col h-c-grid__col--8 h-c-grid__col-m--6 h-c-grid__col-l--6 h-c-grid__col--offset-2 h-c-grid__col-m--offset-3 h-c-grid__col-l--offset-3"><span class="uni-blog-article-tags__label">Posted in:</span><tag-list-block _nghost-c81=""><nav _ngcontent-c81="" class="uni-blog-article-tags__container"><ul _ngcontent-c81="" class="uni-blog-article-tags__tags-list"><li _ngcontent-c81="" class="ng-star-inserted"><a _ngcontent-c81="" class="uni-blog-article-tags-value uni-link-active ng-star-inserted" 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type="application/json">{&q;G.https://gweb-cloudblog-publish.appspot.com/api/w_v2/pagesByUrl/home/topics/developers-practitioners/implementing-leader-election-google-cloud-storage/&q;:{&q;body&q;:{&q;id&q;:42740,&q;meta&q;:{&q;type&q;:&q;blog.ArticlePage&q;,&q;detail_url&q;:&q;/api/w_v2/pagesByUrl/42740&q;,&q;html_url&q;:&q;https://gweb-cloudblog-publish.appspot.com/topics/developers-practitioners/implementing-leader-election-google-cloud-storage/&q;,&q;slug&q;:&q;implementing-leader-election-google-cloud-storage&q;,&q;show_in_menus&q;:false,&q;seo_title&q;:&q;Implementing leader election on Google Cloud Storage&q;,&q;search_description&q;:&q;&q;,&q;first_published_at&q;:&q;2021-01-13T20:12:00.985303Z&q;,&q;parent&q;:{&q;id&q;:41594,&q;meta&q;:{&q;type&q;:&q;blog.TopicLandingPage&q;,&q;detail_url&q;:&q;/api/w_v2/pagesByUrl/41594&q;,&q;html_url&q;:&q;https://gweb-cloudblog-publish.appspot.com/home/topics/developers-practitioners/&q;},&q;title&q;:&q;Developers &a; Practitioners&q;}},&q;title&q;:&q;Implementing leader election on Google Cloud Storage&q;,&q;published_at&q;:&q;2021-01-13T20:00:00Z&q;,&q;last_published_at&q;:&q;2021-01-15T04:07:53.724527Z&q;,&q;authors&q;:[{&q;display_name&q;:&q;Ahmet Alp Balkan&q;,&q;display_role_list&q;:&q;Senior Developer Advocate&q;}],&q;image&q;:{&q;sources&q;:[{&q;url&q;:&q;https://storage.googleapis.com/gweb-cloudblog-publish/images/GCP_Storage_and_Data_Transfer.max-2800x280.max-1100x1100.jpg&q;,&q;media&q;:&q;(max-resolution: 1.5dppx)&q;,&q;srcset&q;:&q;https://storage.googleapis.com/gweb-cloudblog-publish/images/GCP_Storage_and_Data_Transfer.max-2800x280.max-1100x1100.jpg 1060w&q;,&q;width&q;:1060,&q;sizes&q;:&q; 1060px&q;},{&q;url&q;:&q;https://storage.googleapis.com/gweb-cloudblog-publish/images/GCP_Storage_and_Data_Transfer.max-2800x280.max-2200x2200.jpg&q;,&q;media&q;:&q;(min-resolution: 1.5dppx)&q;,&q;srcset&q;:&q;https://storage.googleapis.com/gweb-cloudblog-publish/images/GCP_Storage_and_Data_Transfer.max-2800x280.max-2200x2200.jpg 2120w&q;,&q;width&q;:2120,&q;sizes&q;:&q; 2120px&q;}],&q;alt&q;:&q;#storage&q;,&q;sizes&q;:&q; 1060px, 2120px&q;,&q;srcset&q;:&q;https://storage.googleapis.com/gweb-cloudblog-publish/images/GCP_Storage_and_Data_Transfer.max-2800x280.max-1100x1100.jpg 1060w, https://storage.googleapis.com/gweb-cloudblog-publish/images/GCP_Storage_and_Data_Transfer.max-2800x280.max-2200x2200.jpg 2120w&q;,&q;src&q;:&q;https://storage.googleapis.com/gweb-cloudblog-publish/images/GCP_Storage_and_Data_Transfer.max-2800x280.max-2200x2200.jpg&q;},&q;video&q;:null,&q;summary&q;:&q;Controlling coordination among distributed systems can be complex. This article showcases how to build your own leader election system using only Google Cloud Storage.&q;,&q;body&q;:[{&q;type&q;:&q;paragraph&q;,&q;id&q;:&q;81b745d4-2148-4039-afb5-117935bfdcad&q;,&q;value&q;:&q;&l;p&g;Leader election is a commonly applied pattern for implementing distributed systems. For example, replicated relational databases such as MySQL, or distributed key-value stores such as Apache Zookeeper, choose a leader (sometimes referred to as master) among the replicas. All write operations go through the leader, so only a single node is writing to the system at any time. This is done to ensure no writes are lost and the database is not corrupted.&l;/p&g;&l;p&g;It can be challenging to choose a leader among the nodes of a distributed system due to the nature of networked systems and time synchronization. In this article, we’ll discuss why you need leader election (or more generally, \&q;distributed locks\&q;), explain why they are difficult to implement, and provide an example implementation that uses a strongly consistent storage system, in this case Google Cloud Storage.&l;/p&g;&l;h3&g;Why do we need distributed locks?&l;/h3&g;&l;p&g;Imagine a multithreaded program where each thread is interacting with a shared variable or data structure. To prevent data loss or corrupting the data structure, multiple threads should block and wait on each other while modifying the state. We ensure this with mutexes in a single-process application. Distributed locks are no different in this regard than mutexes in single-process systems.&l;/p&g;&l;p&g;A distributed system working on shared data still needs a locking mechanism to safely take turns while modifying shared data. However, we no longer have the notion of mutexes while working in a distributed environment. This is where distributed locks and leader elections come into the picture.&l;/p&g;&l;h3&g;Use cases for leader election&l;/h3&g;&l;p&g;Typically leader election is used to ensure exclusive access by a single node to shared data, or to ensure a single node coordinates the work in a system.&l;/p&g;&l;p&g;For replicated database systems such as MySQL, Apache Zookeeper, or Cassandra, we need to make sure only one \&q;leader\&q; exists at any given time. All writes go through this leader to ensure writes happen in one place. Meanwhile, the reads can be served from the follower nodes.&l;/p&g;&l;p&g;Here’s another example. You have three nodes for an application that consumes messages from a message queue; however, only one of these nodes is to process messages at any time. By choosing a leader, you can appoint a node to fulfill that responsibility. If the leader becomes unavailable, other nodes can take over and continue the work. In this case, a leader election is needed to coordinate the work.&l;/p&g;&l;p&g;Many distributed systems take advantage of leader election or distributed lock patterns. However, choosing a leader is a nontrivial problem.&l;/p&g;&l;h3&g;Why is distributed locking difficult?&l;/h3&g;&l;p&g;Distributed systems are like threads of a single-process program, except they are on different machines and they talk to each other over the network (which can be unreliable). As a result, they cannot rely on mutexes or similar locking mechanisms that use atomic CPU instructions and shared memory to implement the lock.&l;/p&g;&l;p&g;The distributed locking problem requires the participants to agree on who is holding the lock. We also expect a leader to be elected while some nodes in the system are unavailable. This may sound simple, but implementing such a system correctly can be quite difficult, in part due to the many edge cases. This is where distributed consensus algorithms come into the picture.&l;/p&g;&l;p&g;To implement distributed locking, you need a &l;a href=\&q;https://en.wikipedia.org/wiki/Strong_consistency\&q; target=\&q;_blank\&q;&g;strongly consistent&l;/a&g; system to decide which node holds the lock. Because this must be an atomic operation, it requires &l;a href=\&q;https://en.wikipedia.org/wiki/Consensus_(computer_science)\&q; target=\&q;_blank\&q;&g;consensus protocols&l;/a&g; such as &l;a href=\&q;https://en.wikipedia.org/wiki/Paxos_(computer_science)\&q; target=\&q;_blank\&q;&g;Paxos&l;/a&g;, &l;a href=\&q;https://en.wikipedia.org/wiki/Raft_(algorithm)\&q; target=\&q;_blank\&q;&g;Raft&l;/a&g;, or the &l;a href=\&q;https://en.wikipedia.org/wiki/Two-phase_commit_protocol\&q; target=\&q;_blank\&q;&g;two-phase commit&l;/a&g; protocol. However, implementing these algorithms correctly is quite difficult, as the implementations must be extensively tested and formally proved. Furthermore, the theoretical properties of these algorithms often fail to withstand real-world conditions, which has led to &l;a href=\&q;https://www.hashicorp.com/blog/making-gossip-more-robust-with-lifeguard\&q; target=\&q;_blank\&q;&g;more advanced research&l;/a&g; on the topic.&l;/p&g;&l;p&g;At Google, we achieve distributed locking using a service called &l;a href=\&q;https://static.googleusercontent.com/media/research.google.com/en//archive/chubby-osdi06.pdf\&q; target=\&q;_blank\&q;&g;Chubby&l;/a&g;. Across our stack, Chubby helps many teams at Google make use of distributed consensus without having to worry about implementing a locking service from scratch (and doing so correctly).&l;/p&g;&l;h3&g;Cheating a bit: Leveraging other storage primitives&l;/h3&g;&l;p&g;Instead of implementing your own consensus protocol, you can easily take advantage of a &l;a href=\&q;https://en.wikipedia.org/wiki/Strong_consistency\&q; target=\&q;_blank\&q;&g;strongly consistent&l;/a&g; storage system that provides the same guarantees through a single key or record. By delegating the responsibility for atomicity to an external storage system, we no longer need the participating nodes to form a quorum and vote on a new leader.&l;/p&g;&l;p&g;For example, a distributed database record (or file) can be used to name the current leader, and when the leader has renewed its leadership lock. If there&s;s no leader in the record, or the leader has not renewed its lock, other nodes can run for election by attempting to write their name to the record. First one to come will win, because this record or file allows atomic writes.&l;/p&g;&l;p&g;Such atomic writes on files or database records are typically implemented using &l;a href=\&q;https://en.wikipedia.org/wiki/Optimistic_concurrency_control\&q; target=\&q;_blank\&q;&g;optimistic concurrency control&l;/a&g;, which lets you atomically update the record by providing its version number (if the record has changed since then, the write will be rejected). Similarly, the writes become immediately available to any readers. Using these two primitives (atomic updates and consistent reads), we can implement a leader election on top of any storage system.&l;/p&g;&l;p&g;In fact, many Google Cloud storage products, such as &l;a href=\&q;https://cloud.google.com/storage\&q;&g;Cloud Storage&l;/a&g; and &l;a href=\&q;https://cloud.google.com/spanner\&q;&g;Cloud Spanner&l;/a&g;, can be used to implement such a distributed lock. Similarly, open source storage systems like &l;a href=\&q;https://zookeeper.apache.org/\&q; target=\&q;_blank\&q;&g;Zookeeper&l;/a&g; (Paxos), &l;a href=\&q;https://etcd.io/\&q; target=\&q;_blank\&q;&g;etcd&l;/a&g; (Raft), &l;a href=\&q;https://www.consul.io/\&q; target=\&q;_blank\&q;&g;Consul&l;/a&g; (Raft), or even properly configured RDBMS systems like MySQL or PostgreSQL can provide the needed primitives.&l;/p&g;&l;h3&g;Example: Leader election with Cloud Storage&l;/h3&g;&l;p&g;We can implement leader election using a single object (file) on &l;a href=\&q;https://cloud.google.com/storage\&q;&g;Cloud Storage&l;/a&g; that contains the leader data, and require each node to read that file, or run for election based on the file. In this setup, the leader must renew its leadership by updating this file with its heartbeat.&l;/p&g;&l;p&g;My colleague &l;a href=\&q;https://twitter.com/sethvargo\&q; target=\&q;_blank\&q;&g;Seth Vargo&l;/a&g; published such a leader election implementation – written in Go and using Cloud Storage – &l;a href=\&q;https://godoc.org/github.com/hashicorp/vault/physical/gcs\&q; target=\&q;_blank\&q;&g;as a package&l;/a&g; within the HashiCorp Vault project. (Vault also has a leader election on top of &l;a href=\&q;https://godoc.org/github.com/hashicorp/vault/physical\&q; target=\&q;_blank\&q;&g;other storage backends&l;/a&g;).&l;/p&g;&l;p&g;To implement leader election among distributed nodes of our application in Go, we can write a program that makes use of this package in just 50 lines of code:&l;/p&g;&q;},{&q;type&q;:&q;code&q;,&q;id&q;:&q;b5d8e5f3-1733-4fb7-9891-4d6f348d50b9&q;,&q;value&q;:{&q;code_block&q;:[{&q;code&q;:&q;import (\r\n\t\&q;context\&q;\r\n\r\n\tlog \&q;github.com/hashicorp/go-hclog\&q;\r\n\t\&q;github.com/hashicorp/vault/physical/gcs\&q;\r\n\t\&q;github.com/hashicorp/vault/sdk/physical\&q;\r\n)\r\n\r\nconst (\r\n\tbucketName = \&q;YOUR_GCS_BUCKET_NAME\&q; \r\n \tleadershipFile = \&q;leader.txt\&q;\r\n)\r\n\r\nfunc main() {\r\n\tlogger := log.Default()\r\n\tb, err := gcs.NewBackend(map[string]string{\r\n\t\t\&q;bucket\&q;: bucketName,\r\n\t\t\&q;ha_enabled\&q;: \&q;true\&q;,\r\n\t}, logger)\r\n\tif err != nil {\r\n\t\tpanic(err)\r\n\t}\r\n\thaBackend, ok := b.(physical.HABackend)\r\n\tif !ok {\r\n\t\tpanic(\&q;type casting failed\&q;)\r\n\t}\r\n\r\n\tctx, cancel := context.WithCancel(context.Background())\r\n\tdefer cancel()\r\n\r\n\tfor {\r\n\t\tlock, err := haBackend.LockWith(leadershipFile, \&q;ignored\&q;)\r\n\t\tif err != nil {\r\n\t\t\tpanic(err)\r\n\t\t}\r\n\r\n\t\tlogger.Info(\&q;running for LEADERSHIP\&q;)\r\n\t\tdoneCh, err := lock.Lock(ctx.Done())\r\n\t\tif err != nil {\r\n\t\t\tpanic(err)\r\n\t\t}\r\n\t\tlogger.Info(\&q;elected as LEADER\&q;)\r\n\t\t&l;-doneCh\r\n\t\tlogger.Info(\&q;lost LEADERSHIP\&q;)\r\n\t\tif err := lock.Unlock(); err != nil {\r\n\t\t\tpanic(err)\r\n\t\t}\r\n\t}\r\n}&q;,&q;language&q;:&q;&q;}]}},{&q;type&q;:&q;paragraph&q;,&q;id&q;:&q;79e025ff-6fe9-4fb6-bac2-1e362d760a81&q;,&q;value&q;:&q;&l;p&g;This example program creates a lock using a file in Cloud Storage, and continually runs for election.&l;/p&g;&l;p&g;In this example, the &l;code&g;Lock()&l;/code&g; call blocks until the calling program becomes a leader (or the context is cancelled). This call may block indefinitely since there might be another leader in the system.&l;/p&g;&l;p&g;If a process is elected as the leader, the library periodically sends heartbeats keeping the lock active. The leader then must finish work and give up the lock by calling the &l;code&g;Unlock()&l;/code&g; method. If the leader loses the leadership, the &l;code&g;doneCh&l;/code&g; channel will receive a message and the process can tell that it has lost the lock, as there might be a new leader.&l;/p&g;&l;p&g;Fortunately for us, the library we&s;re using implements a heartbeat mechanism to ensure the elected leader remains available and active. If the elected leader fails abruptly without giving up the lock, after the TTL (time-to-live) on the lock expires, the remaining nodes then select a new leader, ensuring the overall system&s;s availability.&l;/p&g;&l;p&g;Fortunately, this library implements the mentioned details around sending so-called periodic heartbeats, or how frequently the followers should check if the leader has died and if they should run for election. Similarly, the library employs various optimizations via storing the leadership data in &l;a href=\&q;https://cloud.google.com/storage/docs/metadata\&q;&g;object metadata&l;/a&g; instead of object contents, which is costlier to read frequently.&l;/p&g;&l;p&g;If you need to ensure coordination between your nodes, using leader election in your distributed systems can help you safely achieve there&s;s at most one node that has this responsibility. Using Cloud Storage or other strongly consistent systems, you can implement your own leader election. However, make sure you are aware of all the corner cases before implementing a new such library.&l;/p&g;&l;p&g;Further reading:&l;/p&g;&l;a href=\&q;https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/\&q; target=\&q;_blank\&q;&g;&l;/a&g;&l;ul&g;&l;a href=\&q;https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/\&q; target=\&q;_blank\&q;&g;&l;/a&g;&l;a href=\&q;https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/\&q; target=\&q;_blank\&q;&g;&l;/a&g;&l;li&g;&l;a href=\&q;https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/\&q; target=\&q;_blank\&q;&g;&l;/a&g;&l;a href=\&q;https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/\&q; target=\&q;_blank\&q;&g;&l;/a&g;&l;a href=\&q;https://kubernetes.io/blog/2016/01/simple-leader-election-with-kubernetes/\&q; target=\&q;_blank\&q;&g;Implementing leader election using Kubernetes API&l;/a&g;&l;/li&g;&l;li&g;&l;a href=\&q;https://aws.amazon.com/builders-library/leader-election-in-distributed-systems/\&q; target=\&q;_blank\&q;&g;Leader election in distributed systems - AWS Builders Library&l;/a&g;&l;/li&g;&l;li&g;&l;a href=\&q;https://docs.microsoft.com/en-us/azure/architecture/patterns/leader-election\&q; target=\&q;_blank\&q;&g;Leader election - Azure Design Patterns Library&l;/a&g;&l;/li&g;&l;li&g;&l;a href=\&q;https://kubernetespodcast.com/episode/123-leader-election/\&q; target=\&q;_blank\&q;&g;Kubernetes Leader Election on Kubernetes Podcast&l;/a&g;&l;br/&g;&l;/li&g;&l;/ul&g;&l;p&g;Thanks to &l;a href=\&q;https://twitter.com/sethvargo\&q; target=\&q;_blank\&q;&g;Seth Vargo&l;/a&g; for reading drafts of this article. You can follow me &l;a href=\&q;https://twitter.com/ahmetb\&q; target=\&q;_blank\&q;&g;on Twitter&l;/a&g;.&l;/p&g;&q;}],&q;recommended_for_you&q;:[],&q;full_amp_url&q;:&q;https://cloudblog.withgoogle.com/topics/developers-practitioners/implementing-leader-election-google-cloud-storage/amp/&q;,&q;primary_tag&q;:{&q;icon&q;:null,&q;type&q;:&q;Topics&q;,&q;display_name&q;:&q;Developers &a; Practitioners&q;,&q;active&q;:true,&q;landing_page_url&q;:&q;https://gweb-cloudblog-publish.appspot.com/topics/developers-practitioners/&q;,&q;analytics_type&q;:&q;topic&q;,&q;slug&q;:&q;developers&q;},&q;cta&q;:null,&q;secondary_tags&q;:[{&q;icon&q;:{&q;sources&q;:[{&q;url&q;:&q;https://storage.googleapis.com/gweb-cloudblog-publish/images/logo_cloud_color_2x_web_96dp.max-200x200.png&q;,&q;media&q;:&q;(max-resolution: 1.5dppx)&q;,&q;srcset&q;:&q;https://storage.googleapis.com/gweb-cloudblog-publish/images/logo_cloud_color_2x_web_96dp.max-200x200.png 120w&q;,&q;width&q;:120,&q;sizes&q;:&q; 120px&q;},{&q;url&q;:&q;https://storage.googleapis.com/gweb-cloudblog-publish/images/logo_cloud_color_2x_web_96dp.max-200x200.png&q;,&q;media&q;:&q;(min-resolution: 1.5dppx)&q;,&q;srcset&q;:&q;https://storage.googleapis.com/gweb-cloudblog-publish/images/logo_cloud_color_2x_web_96dp.max-200x200.png 192w&q;,&q;width&q;:192,&q;sizes&q;:&q; 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