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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7495) parallel seek in StoreScanner
Date Mon, 04 Feb 2013 10:08:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13570095#comment-13570095
] 

Hadoop QA commented on HBASE-7495:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12567823/HBASE-7495-v11.txt
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 15 new or modified
tests.

    {color:green}+1 hadoop2.0{color}.  The patch compiles against the hadoop 2.0 profile.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 lineLengths{color}.  The patch introduces lines longer than 100

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.regionserver.wal.TestHLog

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/4314//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4314//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4314//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4314//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4314//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4314//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/4314//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/4314//console

This message is automatically generated.
                
> parallel seek in StoreScanner
> -----------------------------
>
>                 Key: HBASE-7495
>                 URL: https://issues.apache.org/jira/browse/HBASE-7495
>             Project: HBase
>          Issue Type: Bug
>          Components: Scanners
>    Affects Versions: 0.94.3, 0.96.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>         Attachments: HBASE-7495-0.94.txt, HBASE-7495.txt, HBASE-7495.txt, HBASE-7495.txt,
HBASE-7495-v10.txt, HBASE-7495-v11.txt, HBASE-7495-v2.txt, HBASE-7495-v3.txt, HBASE-7495-v4.txt,
HBASE-7495-v4.txt, HBASE-7495-v5.txt, HBASE-7495-v6.txt, HBASE-7495-v7.txt, HBASE-7495-v8.txt,
HBASE-7495-v9.txt
>
>
> seems there's a potential improvable space before doing scanner.next:
> {code:title=StoreScanner.java|borderStyle=solid}
>     if (explicitColumnQuery && lazySeekEnabledGlobally) {
>       for (KeyValueScanner scanner : scanners) {
>         scanner.requestSeek(matcher.getStartKey(), false, true);
>       }
>     } else {
>       for (KeyValueScanner scanner : scanners) {
>         scanner.seek(matcher.getStartKey());
>       }
>     }
> {code} 
> we can do scanner.requestSeek or scanner.seek in parallel, instead of current serialization,
to reduce latency for special case.
> Any ideas on it ?  I'll have a try if the comments/suggestions are positive:)

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