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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7276) Limit the number of byte arrays used by DFSOutputStream
Date Thu, 30 Oct 2014 01:20:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14189431#comment-14189431
] 

Hadoop QA commented on HDFS-7276:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12678023/h7276_20141029.patch
  against trunk revision d33e07d.

    {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}.  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.util.TestByteArrayManager

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8591//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8591//console

This message is automatically generated.

> Limit the number of byte arrays used by DFSOutputStream
> -------------------------------------------------------
>
>                 Key: HDFS-7276
>                 URL: https://issues.apache.org/jira/browse/HDFS-7276
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h7276_20141021.patch, h7276_20141022.patch, h7276_20141023.patch,
h7276_20141024.patch, h7276_20141027.patch, h7276_20141027b.patch, h7276_20141028.patch, h7276_20141029.patch,
h7276_20141029b.patch
>
>
> When there are a lot of DFSOutputStream's writing concurrently, the number of outstanding
packets could be large.  The byte arrays created by those packets could occupy a lot of memory.



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