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https://issues.apache.org/jira/browse/HBASE-14621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14959650#comment-14959650
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Ashu Pachauri commented on HBASE-14621:
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The testable parts were already tested in HBASE-12865. This is a transient
error, I am not sure what to test here.
> ReplicationLogCleaner gets stuck when a regionserver crashes
> ------------------------------------------------------------
>
> Key: HBASE-14621
> URL: https://issues.apache.org/jira/browse/HBASE-14621
> Project: HBase
> Issue Type: Bug
> Components: Replication
> Reporter: Ashu Pachauri
> Assignee: Ashu Pachauri
> Priority: Critical
> Attachments: HBASE-14621.patch
>
>
> The ReplicationLogCleaner has a bug that makes it get stuck in an infinite
> loop when a regionserver crashes. This bug was introduced in the fix for
> HBASE-12865; which makes sure that the loadWALsFromQueues method attempts a
> retry whenever the replication node's cversion is changed in the middle of
> loading the replication queue for the regionservers. However, if this
> scenario actually happens (a regionserver crash in the middle of the
> operation), it will get stuck in an infinite loop.
> It has very serious ramifications because the old WALs are not cleaned up
> because of this and in a high load environment, the file count in the oldWALs
> directory soon exceeds the inode limit and the cluster goes down.
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