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https://issues.apache.org/jira/browse/HDFS-6945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Akira AJISAKA updated HDFS-6945:
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Attachment: HDFS-6945.2.patch
Updated the patch to avoid ConcurrentModificationException when removing a
value from TreeMap.
> excessReplicateMap can increase infinitely
> ------------------------------------------
>
> Key: HDFS-6945
> URL: https://issues.apache.org/jira/browse/HDFS-6945
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.5.0
> Reporter: Akira AJISAKA
> Assignee: Akira AJISAKA
> Priority: Critical
> Labels: metrics
> Attachments: HDFS-6945.2.patch, HDFS-6945.patch
>
>
> I'm seeing ExcessBlocks metric increases to more than 300K in some clusters,
> however, there are no over-replicated blocks (confirmed by fsck).
> After a further research, I noticed when deleting a block, BlockManager does
> not remove the block from excessReplicateMap or decrement excessBlocksCount.
> Usually the metric is decremented when processing block report, however, if
> the block has been deleted, BlockManager does not remove the block from
> excessReplicateMap or decrement the metric.
> That way the metric and excessReplicateMap can increase infinitely (i.e.
> memory leak can occur).
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