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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5998) Bulk assignment: regionserver optimization by using a temporary cache for table descriptors when receveing an open regions request
Date Mon, 14 May 2012 10:38:48 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5998?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

nkeywal updated HBASE-5998:
---------------------------

    Status: Patch Available  (was: Open)
    
> 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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