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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6059) Speed up history server startup time
Date Thu, 28 Aug 2014 18:24:09 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14114110#comment-14114110
] 

Hadoop QA commented on MAPREDUCE-6059:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12658247/YARN-2366.v1.patch
  against trunk revision c4c9a78.

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

    {color:green}+1 javadoc{color}.  There were no new javadoc 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
2.0.3) warnings.

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

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

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4832//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4832//console

This message is automatically generated.

> Speed up history server startup time
> ------------------------------------
>
>                 Key: MAPREDUCE-6059
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6059
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: Siqi Li
>            Assignee: Siqi Li
>         Attachments: YARN-2366.v1.patch
>
>
> When history server starts up, It scans every history directories and put all history
files into a cache, whereas this cache only stores 20K recent history files. Therefore, it
is wasting a large portion of time loading old history files into the cache, and the startup
time will keep increasing if we don't trim the number of history files. For example, when
history server starts up with 2.5M history files in HDFS, it took ~5 minutes.



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