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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8046) Allow better control of getContentSummary
Date Thu, 02 Apr 2015 21:22:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14393448#comment-14393448
] 

Hadoop QA commented on HDFS-8046:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12709012/HDFS-8046.v1.patch
  against trunk revision 867d5d2.

    {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:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.server.namenode.ha.TestRetryCacheWithHA
                  org.apache.hadoop.hdfs.server.namenode.ha.TestFailureToReadEdits

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/10164//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/10164//console

This message is automatically generated.

> Allow better control of getContentSummary
> -----------------------------------------
>
>                 Key: HDFS-8046
>                 URL: https://issues.apache.org/jira/browse/HDFS-8046
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>         Attachments: HDFS-8046.v1.patch
>
>
> On busy clusters, users performing quota checks against a big directory structure can
affect the namenode performance. It has become a lot better after HDFS-4995, but as clusters
get bigger and busier, it is apparent that we need finer grain control to avoid long read
lock causing throughput drop.
> Even with unfair namesystem lock setting, a long read lock (10s of milliseconds) can
starve many readers and especially writers. So the locking duration should be reduced, which
can be done by imposing a lower count-per-iteration limit in the existing implementation.
 But HDFS-4995 came with a fixed amount of sleep between locks. This needs to be made configurable,
so that {{getContentSummary()}} doesn't get exceedingly slow.



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