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https://issues.apache.org/jira/browse/HBASE-5998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295271#comment-13295271
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stack commented on HBASE-5998:
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I took a look at backporting at Anoop's request. Its not a clean backport.
Mind taking a look Nkeywal?
> Bulk assignment: regionserver optimization by using a temporary cache for
> table descriptors when receveing an open regions request
> ----------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-5998
> URL: https://issues.apache.org/jira/browse/HBASE-5998
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Affects Versions: 0.96.0
> Reporter: nkeywal
> Assignee: nkeywal
> Priority: Minor
> Fix For: 0.96.0
>
> Attachments: 5998.v2.patch, 5998.v3.patch
>
>
> During the assignment, on the regionserver, before creating the handlers we
> load the table description. Even if there is a cache, we check the timestamps
> for each region, while it's not necessary. The test below is just with one
> node, with more nodes the benefit will improve. By limiting the time spent in
> HRegion#openRegion we increase the parallelization during cluster startup, as
> the master is using a pool of threads to call the RS.
> -- Without the fix
> 2012-05-14 11:40:52,501 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning 1193
> region(s) to localhost,11003,1336988444043
> 2012-05-14 11:41:09,947 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning done for
> localhost,11003,1336988444043
> -- With the fix
> 2012-05-14 11:34:40,444 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning 1193
> region(s) to localhost,11003,1336988444043
> 2012-05-14 11:34:40,929 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning done for
> localhost,11003,1336988065948
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