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https://issues.apache.org/jira/browse/HBASE-10660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13918841#comment-13918841
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Enis Soztutar commented on HBASE-10660:
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Lars suggested disabling caching data blocks in HBASE-10642. I think it makes
sense to do it. Not sure whether completely disabling the block cache would
have any impact on the scan, because we may still be going back to the index
block to continue the scan. I did not check that.
> 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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