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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5153) Datanode should send block reports for each storage in a separate message
Date Thu, 16 Jan 2014 07:19:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13873116#comment-13873116
] 

Hadoop QA commented on HDFS-5153:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12623310/HDFS-5153.03.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:red}-1 findbugs{color}.  The patch appears to introduce 1 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/5894//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/5894//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5894//console

This message is automatically generated.

> Datanode should send block reports for each storage in a separate message
> -------------------------------------------------------------------------
>
>                 Key: HDFS-5153
>                 URL: https://issues.apache.org/jira/browse/HDFS-5153
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 3.0.0
>            Reporter: Arpit Agarwal
>         Attachments: HDFS-5153.01.patch, HDFS-5153.03.patch
>
>
> When the number of blocks on the DataNode grows large we start running into a few issues:
> # Block reports take a long time to process on the NameNode. In testing we have seen
that a block report with 6 Million blocks takes close to one second to process on the NameNode.
The NameSystem write lock is held during this time.
> # We start hitting the default protobuf message limit of 64MB somewhere around 10 Million
blocks. While we can increase the message size limit it already takes over 7 seconds to serialize/unserialize
a block report of this size.
> HDFS-2832 has introduced the concept of a DataNode as a collection of storages i.e. the
NameNode is aware of all the volumes (storage directories) attached to a given DataNode. This
makes it easy to split block reports from the DN by sending one report per storage directory
to mitigate the above problems.



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