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https://issues.apache.org/jira/browse/HBASE-16135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15358326#comment-15358326
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Ted Yu commented on HBASE-16135:
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To remove element from CopyOnWriteArrayList, we don't need to use iterator.
We can iterate oldsources using index (in reverse) and call
closeRecoveredQueue() passing the element at the index.
Just for your reference.
> PeerClusterZnode under rs of removed peer may never be deleted
> --------------------------------------------------------------
>
> Key: HBASE-16135
> URL: https://issues.apache.org/jira/browse/HBASE-16135
> Project: HBase
> Issue Type: Bug
> Components: Replication
> Affects Versions: 2.0.0, 1.3.0, 1.4.0, 1.1.5, 1.2.2, 0.98.20
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Fix For: 2.0.0, 1.3.0, 1.4.0, 1.1.6, 0.98.21, 1.2.3
>
> Attachments: HBASE-16135-0.98.patch, HBASE-16135-branch-1.1.patch,
> HBASE-16135-branch-1.2.patch, HBASE-16135-branch-1.patch,
> HBASE-16135-v1.patch, HBASE-16135-v2.patch, HBASE-16135.patch
>
>
> One of our cluster run out of space recently, and we found that the .oldlogs
> directory had almost the same size as the data directory.
> Finally we found the problem is that, we removed a peer abort 3 months ago,
> but there are still some replication queue znode under some rs nodes. This
> prevents the deletion of .oldlogs.
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