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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6945) excessReplicateMap can increase infinitely
Date Mon, 01 Sep 2014 04:50:21 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Akira AJISAKA updated HDFS-6945:
--------------------------------
    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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