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https://issues.apache.org/jira/browse/HBASE-4055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060191#comment-13060191
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stack commented on HBASE-4055:
------------------------------
Andrew. I think 451 in 90 too big a change (it's not finished yet on trunk).
Meantime the fix by the lads from huawei should do in the meantime. We just
need to push out 0.90.4
> 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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