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https://issues.apache.org/jira/browse/HBASE-4055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dave Latham resolved HBASE-4055.
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Resolution: Duplicate
Ah, that should probably do it, Stack. Thanks for the work. Sorry for the
duplicate issue.
It seems like too risky a change for the branch to me. I look forward to
seeing 0.92.
> Client region location caches redundant HTableDescriptor's
> ----------------------------------------------------------
>
> Key: HBASE-4055
> URL: https://issues.apache.org/jira/browse/HBASE-4055
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.90.3
> Reporter: Dave Latham
> Fix For: 0.92.0
>
>
> While examining the heap of a map task in a MapReduce job that writes
> directly to HBase, I noticed that the HRegionLocation instances were taking
> up 90 MB (out of a 700 MB heap for each map task) to cache the locations for
> 15K regions. As the number of regions in the cluster continues to grow, this
> continues to grow as well.
> Of that, it appears that about 80 MB were going to 15K HTableDescriptor
> instances. There are only 5 tables that it's writing to, so it seems to be
> wasting a great deal of memory with a separate copy of the table descriptor
> for each region.
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