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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4907) TrackerDistributedCacheManager issues too many getFileStatus calls
Date Thu, 10 Jan 2013 00:44:15 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13549246#comment-13549246

Hadoop QA commented on MAPREDUCE-4907:

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  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: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-core.

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3225//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3225//console

This message is automatically generated.
> TrackerDistributedCacheManager issues too many getFileStatus calls
> ------------------------------------------------------------------
>                 Key: MAPREDUCE-4907
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4907
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv1, tasktracker
>    Affects Versions: 1.1.1
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: MAPREDUCE-4907.patch, MAPREDUCE-4907-trunk-1.patch, MAPREDUCE-4907-trunk-1.patch,
MAPREDUCE-4907-trunk-1.patch, MAPREDUCE-4907-trunk.patch
> TrackerDistributedCacheManager issues a number of redundant getFileStatus calls when
determining the timestamps and visibilities of files in the distributed cache.  300 distributed
cache files deep in the directory structure can hammer HDFS with a couple thousand requests.
> A couple optimizations can reduce this load:
> 1. determineTimestamps and determineCacheVisibilities both call getFileStatus on every
file.  We could cache the results of the former and use them for the latter.
> 2. determineCacheVisibilities needs to check that all ancestor directories of each file
have execute permissions for everyone.  This currently entails a getFileStatus on each ancestor
directory for each file.  The results of these getFileStatus calls could be cached as well.

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