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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4785) Improve recovery time of HBase client when a region server dies.
Date Wed, 23 Nov 2011 20:53:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156269#comment-13156269
] 

Hadoop QA commented on HBASE-4785:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12504907/HBASE-4785.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 javadoc.  The javadoc tool appears to have generated -162 warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 66 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

     -1 core tests.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.client.TestAdmin
                  org.apache.hadoop.hbase.regionserver.wal.TestLogRolling

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/349//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/349//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/349//console

This message is automatically generated.
                
> Improve recovery time of HBase client when a region server dies.
> ----------------------------------------------------------------
>
>                 Key: HBASE-4785
>                 URL: https://issues.apache.org/jira/browse/HBASE-4785
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>            Priority: Minor
>             Fix For: 0.94.0
>
>         Attachments: HBASE-4785.patch, HBASE-4785.patch
>
>
> When a region server dies, the HBase client waits until the RPC timesout before learning
that it needs to check META to find the new location of the region. And it incurs this *timeout*
cost for every region being served by the dead region server. Remove this overhead by clearing
the entries in cache that have the dead region server as their values.

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