[jira] [Resolved] (HBASE-10660) MR over snapshots can OOM when alternative blockcache is enabled

["Nick Dimiduk (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-10660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nick Dimiduk resolved HBASE-10660.
----------------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed

Committed to 0.98 and trunk. We can backport to 0.96 and 0.94 when the time comes.

> MR over snapshots can OOM when alternative blockcache is enabled
> ----------------------------------------------------------------
>
>                 Key: HBASE-10660
>                 URL: https://issues.apache.org/jira/browse/HBASE-10660
>             Project: HBase
>          Issue Type: Bug
>          Components: mapreduce
>    Affects Versions: 0.98.0, 0.99.0
>            Reporter: Nick Dimiduk
>            Assignee: Nick Dimiduk
>         Attachments: HBASE-10660.00.patch, HBASE-10660.01.patch, HBASE-10660.02.patch, HBASE-10660.03.patch
>
>
> Running {{IntegrationTestTableSnapshotInputFormat}} with the {{BucketCache}} enabled results in OOM. The map task is running a sequential scan over the region region it opened, so probably it's not benefiting much from a blockcache. Just disable blockcache entirely for these scans because it's likely the cache config detected is designed for a RS running on a different class of hardware than that running the map task.



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