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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5037) Active NN should trigger its own edit log rolls
Date Fri, 01 Nov 2013 00:35:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13810896#comment-13810896
] 

Hadoop QA commented on HDFS-5037:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12611500/hdfs-5037-2.patch
  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 1 new or modified
test files.

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

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

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

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

        {color:red}-1 release audit{color}.  The applied patch generated 1 release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/5319//testReport/
Release audit warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/5319//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5319//console

This message is automatically generated.

> Active NN should trigger its own edit log rolls
> -----------------------------------------------
>
>                 Key: HDFS-5037
>                 URL: https://issues.apache.org/jira/browse/HDFS-5037
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha, namenode
>    Affects Versions: 3.0.0, 2.1.0-beta
>            Reporter: Todd Lipcon
>            Assignee: Andrew Wang
>            Priority: Critical
>         Attachments: hdfs-5037-1.patch, hdfs-5037-2.patch, hdfs-5037-3.patch
>
>
> We've seen cases where the SBN/2NN went down, and then users accumulated very very large
edit log segments. This causes a slow startup time because the last edit log segment must
be read fully to recover it before the NN can start up again. Additionally, in the case of
QJM, it can trigger timeouts on recovery or edit log syncing because the very-large segment
has to get processed within a certain time bound.
> We could easily improve this by having the NN trigger its own edit log rolls on a configurable
size (eg every 256MB)



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