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Date: Mon, 14 May 2012 12:14:13 +0000 (UTC)
From: "nkeywal (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-5998) Bulk assignment: regionserver
 optimization by using a temporary cache for table descriptors when
 receveing an open regions request
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    [ https://issues.apache.org/jira/browse/HBASE-5998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13274572#comment-13274572 ] 

nkeywal commented on HBASE-5998:
--------------------------------

The failure in TestDrainingServer is not directly related to my change. I will have a look and fix the flakiness in another jira.
                
> 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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