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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5517) Lower the default maximum number of blocks per file
Date Fri, 15 Nov 2013 22:05:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824152#comment-13824152
] 

Hadoop QA commented on HDFS-5517:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12614116/HDFS-5517.patch
  against trunk revision .

    {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}.  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/5449//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5449//console

This message is automatically generated.

> Lower the default maximum number of blocks per file
> ---------------------------------------------------
>
>                 Key: HDFS-5517
>                 URL: https://issues.apache.org/jira/browse/HDFS-5517
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.2.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-5517.patch
>
>
> We introduced the maximum number of blocks per file in HDFS-4305, but we set the default
to 1MM. In practice this limit is so high as to never be hit, whereas we know that an individual
file with 10s of thousands of blocks can cause problems. We should lower the default value,
in my opinion to 10k.



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