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https://issues.apache.org/jira/browse/HBASE-10660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13918897#comment-13918897
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Lars Hofhansl commented on HBASE-10660:
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We should just disable the caching of data blocks (i.e. just setting
cacheBlocks to false on the Scan object used). We still want the index blocks
cached (typically a few MB are enough for those) otherwise scan performance
will probably be quite bad.
> 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
>
>
> 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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