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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HELIX-682) Stale message should not prevent controller from rebalancing resource
Date Tue, 24 Apr 2018 22:45:00 GMT

    [ https://issues.apache.org/jira/browse/HELIX-682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16451358#comment-16451358

Hudson commented on HELIX-682:

FAILURE: Integrated in Jenkins build helix #1451 (See [https://builds.apache.org/job/helix/1451/])
[HELIX-682] delete duplicated message and log error in HelixTaskExecutor (zhan849: rev 5f9fadc72bc1916f008792707db848ee51bbd997)
* (edit) helix-core/src/test/java/org/apache/helix/messaging/handling/TestHelixTaskExecutor.java
* (edit) helix-core/src/test/java/org/apache/helix/MockAccessor.java
* (edit) helix-core/src/main/java/org/apache/helix/messaging/handling/HelixTaskExecutor.java

> Stale message should not prevent controller from rebalancing resource
> ---------------------------------------------------------------------
>                 Key: HELIX-682
>                 URL: https://issues.apache.org/jira/browse/HELIX-682
>             Project: Apache Helix
>          Issue Type: Bug
>            Reporter: Hao Zhang
>            Priority: Major
> Currently during MessageGenerationPhase, we skip re-balancing when there is pending message.
Though we assume that participant will delete messages when they finish the task, there will
be cases that when ZK is not stable and participant fail to do so, which will leave message
un-deleted and thus block rebalance.
> Ideally on controller side, we should try to delete message as well: if partition's current
state is same as message's toState, or there is totally invalid message remaining, controller
should try to delete message to unblock rebalancing

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