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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5492) Caching StartKeys and EndKeys of Regions
Date Wed, 29 Feb 2012 17:11:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13219345#comment-13219345
] 

Hadoop QA commented on HBASE-5492:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12516578/HBASE-5492.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 -131 warning messages.

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

    -1 findbugs.  The patch appears to introduce 154 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.regionserver.wal.TestHLog
                  org.apache.hadoop.hbase.TestRegionRebalancing

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/1061//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/1061//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/1061//console

This message is automatically generated.
                
> Caching StartKeys and EndKeys of Regions
> ----------------------------------------
>
>                 Key: HBASE-5492
>                 URL: https://issues.apache.org/jira/browse/HBASE-5492
>             Project: HBase
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 0.92.0
>         Environment: all
>            Reporter: honghua zhu
>             Fix For: 0.92.1
>
>         Attachments: HBASE-5492.patch
>
>
> Each call for HTable.getStartEndKeys will read meta table.
> In particular, 
> in the case of client side multi-threaded concurrency statistics, 
> we must call HTable.coprocessorExec== > getStartKeysInRange ==> getStartEndKeys,
> resulting in the need to always scan the meta table.
> This is not necessary,
> we can implement the HConnectionManager.HConnectionImplementation.locateRegions(byte[]
tableName) method,
> then, get the StartKeys and EndKeys from the cachedRegionLocations of HConnectionImplementation.
> Combined with https://issues.apache.org/jira/browse/HBASE-5491, can improve the performance
of statistical

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