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https://issues.apache.org/jira/browse/SAMZA-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390263#comment-16390263
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ASF GitHub Bot commented on SAMZA-1607:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/samza/pull/437
> SAMZA-1607: Handle ZkNoNodeExistsException in zkUtils.readProcessorData
> -----------------------------------------------------------------------
>
> Key: SAMZA-1607
> URL: https://issues.apache.org/jira/browse/SAMZA-1607
> Project: Samza
> Issue Type: Bug
> Reporter: Shanthoosh Venkataraman
> Assignee: Shanthoosh Venkataraman
> Priority: Major
>
> Existing implementation of reading the data of ephemeral processor nodes in
> zookeeper happens in two steps.
> A. Fetch the list of ephemeral processor nodes.
> B. Read the data of each processor node from the list.
> A ephemeral zookeeper node present in step A might be unavailable in the step
> B. This exception in unhandled currently and can kill the leader processor
> unnecessarily. Here's the related exception observed in a dev setup.
> {code:java}
> org.apache.samza.SamzaException: Cannot read ZK node:
> /app-test-app-name-9fba7675-36e3-4a6e-8934-4cad6a8ebab0-test-app-id-9fba7675-36e3-4a6e-8934-4cad6a8ebab0/test-app-name-9fba7675-36e3-4a6e-8934-4cad6a8ebab0-test-app-id-9fba7675-36e3-4a6e-8934-4cad6a8ebab0-coordinationData/processors/0000000001
> at org.apache.samza.zk.ZkUtils.readProcessorData(ZkUtils.java:232)
> at org.apache.samza.zk.ZkUtils.getActiveProcessorsIDs(ZkUtils.java:255)
> at
> org.apache.samza.zk.ZkJobCoordinator.getActualProcessorIds(ZkJobCoordinator.java:292)
> at
> org.apache.samza.zk.ZkJobCoordinator.doOnProcessorChange(ZkJobCoordinator.java:194)
> at
> org.apache.samza.zk.ZkJobCoordinator.lambda$onProcessorChange$1(ZkJobCoordinator.java:188)
> at
> org.apache.samza.zk.ScheduleAfterDebounceTime.lambda$getScheduleableAction$0(ScheduleAfterDebounceTime.java:134)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: org.I0Itec.zkclient.exception.ZkNoNodeException:
> org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode =
> NoNode for
> /app-test-app-name-9fba7675-36e3-4a6e-8934-4cad6a8ebab0-test-app-id-9fba7675-36e3-4a6e-8934-4cad6a8ebab0/test-app-name-9fba7675-36e3-4a6e-8934-4cad6a8ebab0-test-app-id-9fba7675-36e3-4a6e-8934-4cad6a8ebab0-coordinationData/processors/0000000001
> at org.I0Itec.zkclient.exception.ZkException.create(ZkException.java:47)
> at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:1001)
> at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:1100)
> at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:1095)
> at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:1084)
> at org.apache.samza.zk.ZkUtils.readProcessorData(ZkUtils.java:226)
> {code}
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