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Posted to commits@cassandra.apache.org by "Jordan West (Jira)" <ji...@apache.org> on 2019/12/03 18:08:00 UTC
[jira] [Commented] (CASSANDRA-15295) Running into deadlock when do
CommitLog initialization
[ https://issues.apache.org/jira/browse/CASSANDRA-15295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16987133#comment-16987133 ]
Jordan West commented on CASSANDRA-15295:
-----------------------------------------
LGTM. +1. Thanks for all the revisions along the way [~gzh1992n] [~djoshi]
> Running into deadlock when do CommitLog initialization
> ------------------------------------------------------
>
> Key: CASSANDRA-15295
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15295
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Commit Log
> Reporter: Zephyr Guo
> Assignee: Zephyr Guo
> Priority: Normal
> Attachments: image.png, jstack.log, pstack.log, screenshot-1.png, screenshot-2.png, screenshot-3.png
>
>
> Recently, I found a cassandra(3.11.4) node stuck in STARTING status for a long time.
> I used jstack to saw what happened. The main thread stuck in *AbstractCommitLogSegmentManager.awaitAvailableSegment*
> !screenshot-1.png!
> The strange thing is COMMIT-LOG-ALLOCATOR thread state was runnable but it was not actually running.
> !screenshot-2.png!
> And then I used pstack to troubleshoot. I found COMMIT-LOG-ALLOCATOR block on java class initialization.
> !screenshot-3.png!
> This is a deadlock obviously. CommitLog waits for a CommitLogSegment when initializing. In this moment, the CommitLog class is not initialized and the main thread holds the class lock. After that, COMMIT-LOG-ALLOCATOR creates a CommitLogSegment with exception and call *CommitLog.handleCommitError*(static method). COMMIT-LOG-ALLOCATOR will block on this line because CommitLog class is still initializing.
>
>
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