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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8599) HLogs in ZK are not cleaned up when replication lag is minimal
Date Wed, 10 Jul 2013 18:11:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704853#comment-13704853
] 

Hadoop QA commented on HBASE-8599:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12591675/8599-trunk-v3.patch
  against trunk revision .

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

    {color:red}-1 tests included{color}.  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.

    {color:green}+1 hadoop1.0{color}.  The patch compiles against the hadoop 1.0 profile.

    {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:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn site goal succeeds with this patch.

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.client.TestAdmin

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/6294//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6294//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6294//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6294//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6294//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6294//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6294//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6294//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/6294//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/6294//console

This message is automatically generated.
                
> HLogs in ZK are not cleaned up when replication lag is minimal
> --------------------------------------------------------------
>
>                 Key: HBASE-8599
>                 URL: https://issues.apache.org/jira/browse/HBASE-8599
>             Project: HBase
>          Issue Type: Improvement
>          Components: Replication
>    Affects Versions: 0.98.0, 0.94.7
>            Reporter: Varun Sharma
>            Assignee: Varun Sharma
>             Fix For: 0.98.0, 0.94.10
>
>         Attachments: 8599-0.94.patch, 8599-trunk.patch, 8599-trunk-v2.patch, 8599-trunk-v3.patch
>
>
> On a cluster with very low replication lag (as measured by ageOfLastShippedOp on source),
we found HLogs accumulating and not being cleaned up as new WAL(s) are rolled.
> Each time, we call logPositionAndCleanOldLogs() to clean older logs whenever the current
WAL is not being written to any more - as suggested by currentWALBeingWrittenTo being false.
However, when lags are small, we may hit the following block first and continue onto the next
WAL without clearing the old WAL(s)...
> ReplicationSource::run() {
>     if (readAllEntriesToReplicateOrNextFile(currentWALisBeingWrittenTo = false)) {
>         // If we are here, then we advance to the next WAL without any cleaning
>         // and close existing WAL
>         continue;
>     }
>     // Ship some edits and call logPositionAndCleanOldLogs
> }
> If we hit readAllEntriesToReplicateOrNextFile(false) only once - then older logs are
not cleaned out and persist in the zookeeper node since we simply call "continue" and skip
the subsequent logPositionAndCleanOldLogs call - if its called more than once, we do end up
clearing the old logs.

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