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https://issues.apache.org/jira/browse/HBASE-4055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13058887#comment-13058887
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Andrew Purtell commented on HBASE-4055:
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bq. HRegionInfo no longer carries an HTableDescriptor instance in TRUNK
Maybe we should do this in 0.90 too? ... assuming we do the right thing with
actually returning valid HTDs from methods as if nothing has changed behind the
curtain.
> 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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