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Posted to issues@hbase.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2012/05/14 12:22:49 UTC
[jira] [Commented] (HBASE-5998) Bulk assignment: regionserver
optimization by using a temporary cache for table descriptors when
receveing an open regions request
[ https://issues.apache.org/jira/browse/HBASE-5998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13274545#comment-13274545 ]
Hadoop QA commented on HBASE-5998:
----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12526734/5998.v2.patch
against trunk revision .
+1 @author. The patch does not contain any @author tags.
-1 tests included. The patch doesn't appear to include any new or modified tests.
Please justify why no new tests are needed for this patch.
Also please list what manual steps were performed to verify this patch.
-1 patch. The patch command could not apply the patch.
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/1864//console
This message is automatically generated.
> 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
>
>
> 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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