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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4434) Improve log rotation and reduce communication between agent and logging process, make agent more fault tolerant
Date Thu, 06 Nov 2008 09:53:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645442#action_12645442
] 

Hadoop QA commented on HADOOP-4434:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12393353/HADOOP-4434.patch
  against trunk revision 711734.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 12 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

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

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3540/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3540/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3540/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3540/console

This message is automatically generated.

> Improve log rotation and reduce communication between agent and logging process, make
agent more fault tolerant
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4434
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4434
>             Project: Hadoop Core
>          Issue Type: Improvement
>         Environment: Redhat Enterprise Linux 4.5, Java 6
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>         Attachments: HADOOP-4434.patch
>
>   Original Estimate: 96h
>  Remaining Estimate: 96h
>
> - Chukwa Agent does not handle rotated log correctly.  The current design requires the
logging process to pause the agent, rotate the log, then resume the log streaming.  The three
communication between the running process and chukwa agent could become a problem when either
or one of the process is down.  The implementation should be able to detect log rotation in
the chukwa agent.
> - Chukwa Agent should detect and prevent the same log being streamed more than once.
> - Chukwa Agent should synchronize data streaming addition when picking up the check point
file.

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