[GitHub] [flink] lamber-ken opened a new pull request #9158: [FLINK-10052][coordination] Tolerate temporarily suspended ZooKeeper connections

[GitBox <gi...@apache.org>]

lamber-ken opened a new pull request #9158: [FLINK-10052][coordination] Tolerate temporarily suspended ZooKeeper connections
URL: https://github.com/apache/flink/pull/9158
 
 
   ## What is the purpose of the change
   ### Desc
   The `ZooKeeperLeaderElectionService` uses the LeaderLatch Curator recipe for leader election. The leader latch revokes leadership in case of a suspended ZooKeeper connection. This can be premature in case that the system can reconnect to ZooKeeper before its session expires. The effect of the lost leadership is that all jobs will be canceled and directly restarted after regaining the leadership. When more and more tasks deployed in cluster, the situation will get worse and worse.
   
   ### Aims
   - Fix the impact of zookeeper network disconnect temporarily on flink long running jobs.
   - Improve the stability of the flink longrunning jobs.
   
   ### Detail
   Click here for more jira detail [FLINK-10052](https://issues.apache.org/jira/browse/FLINK-10052).
   
   <br />
   
   ## Brief change log
   
     - upgrage curator-recipes dependency to 4.2.0
     - use `SessionConnectionStateErrorPolicy` as the error connect policy when build `CuratorFramework`
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as *ZooKeeperLeaderElectionITCase*.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not documented)
   

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