[jira] [Commented] (HDFS-4995) Make getContentSummary() less expensive

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-4995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13798500#comment-13798500 ] 

Hadoop QA commented on HDFS-4995:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12609007/HDFS-4995.trunk1.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: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-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/5229//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5229//console

This message is automatically generated.

> Make getContentSummary() less expensive
> ---------------------------------------
>
>                 Key: HDFS-4995
>                 URL: https://issues.apache.org/jira/browse/HDFS-4995
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 0.23.9, 2.3.0
>            Reporter: Kihwal Lee
>         Attachments: HDFS-4995.trunk1.patch
>
>
> When users call du or count DFS command, getContentSummary() method is called against namenode. If the directory has many directories and files, it could hold the namesystem lock for a long time. We've seen it taking over 20 seconds. Namenode should not allow regular users to cause extended locking.



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