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Posted to dev@lucene.apache.org by "Ishan Chattopadhyaya (JIRA)" <ji...@apache.org> on 2018/02/05 14:10:00 UTC
[jira] [Assigned] (SOLR-11932) ZkCmdExecutor: Retry ZkOperation on
SessionExpired
[ https://issues.apache.org/jira/browse/SOLR-11932?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ishan Chattopadhyaya reassigned SOLR-11932:
-------------------------------------------
Assignee: Ishan Chattopadhyaya
> ZkCmdExecutor: Retry ZkOperation on SessionExpired
> ---------------------------------------------------
>
> Key: SOLR-11932
> URL: https://issues.apache.org/jira/browse/SOLR-11932
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.2
> Reporter: John Gallagher
> Assignee: Ishan Chattopadhyaya
> Priority: Major
> Attachments: SessionExpiredLog.txt, zk_retry.patch
>
>
> We are seeing situations where an operation, such as changing a replica's state to active after a recovery, fails because the zk session has expired.
> However, these operations seem like they are retryable, because the ZookeeperConnect receives an event that the session expired and tries to reconnect.
> That makes the SessionExpired handling scenario seem very similar to the ConnectionLoss handling scenario, so the ZkCmdExecutor seems like it could handle them in the same way.
>
> Here's an example stack trace with some slight redactions: [^SessionExpiredLog.txt] In this case, a zk operation (a read) failed with a SessionExpired event, which seems retriable. The exception kicked off a reconnection, but seems like the subsequent operation, (publishing as active) failed (perhaps it was using a stale connection handle at that point?)
>
> Regardless, the watch mechanism that reestablishes connection on SessionExpired seems sufficient to allow the ZkCmdExecutor to retry that operation at a later time and have hope of succeeding.
>
> I have included a simple patch we are trying that catches both exceptions instead of just ConnectionLossException: [^zk_retry.patch]
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