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https://issues.apache.org/jira/browse/HBASE-1988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780347#action_12780347
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Stefan Will commented on HBASE-1988:
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Our HBase instance currently only has 700MB of data, and most scans are done by
MR mappers that all scan a very small amount of meta data (less than 10MB, I
think). So the scans should easily be able to be handled out of cache. At this
point we're using HBase as a cache for some precomputed data values, so the
tables are neither particularly tall nor particularly wide.
> OutOfMemoryError in RegionServer
> --------------------------------
>
> Key: HBASE-1988
> URL: https://issues.apache.org/jira/browse/HBASE-1988
> Project: Hadoop HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.20.2
> Environment: Java 1.6.0_16 64bit on CentOS with 3000M max heap
> Reporter: Stefan Will
> Attachments: regionserver.log.gz
>
>
> RegionServers tend to die with an OutOfMemoryError under load. I expected
> this problem to go away with the fix for HBASE-1927 in 0.20.2 RC1, but it's
> still happening. Also, when this happens the cluster becomes unresponsive,
> even once the load on the machines has gone back down. Interestingly there
> are lots and lots of scanner lease expired messages right before the OOM.
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