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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2576) Namenode should have a favored nodes hint to enable clients to have control over block placement.
Date Fri, 26 Apr 2013 03:58:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642566#comment-13642566
] 

Hadoop QA commented on HDFS-2576:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12580648/hdfs-2576-trunk-8.2.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 5 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:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-common-project/hadoop-common
hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.server.blockmanagement.TestReplicationPolicy
                  org.apache.hadoop.hdfs.server.datanode.TestBlockReplacement
                  org.apache.hadoop.net.TestNetworkTopology
                  org.apache.hadoop.cli.TestHDFSCLI
                  org.apache.hadoop.hdfs.server.balancer.TestBalancerWithNodeGroup
                  org.apache.hadoop.hdfs.server.namenode.TestHostsFiles
                  org.apache.hadoop.hdfs.server.blockmanagement.TestBlocksWithNotEnoughRacks
                  org.apache.hadoop.hdfs.TestReplication

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/4321//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/4321//console

This message is automatically generated.
                
> Namenode should have a favored nodes hint to enable clients to have control over block
placement.
> -------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-2576
>                 URL: https://issues.apache.org/jira/browse/HDFS-2576
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Pritam Damania
>            Assignee: Devaraj Das
>             Fix For: 2.0.5-beta
>
>         Attachments: hdfs-2576-1.txt, hdfs-2576-trunk-1.patch, hdfs-2576-trunk-2.patch,
hdfs-2576-trunk-7.1.patch, hdfs-2576-trunk-7.patch, hdfs-2576-trunk-8.1.patch, hdfs-2576-trunk-8.2.patch,
hdfs-2576-trunk-8.patch
>
>
> Sometimes Clients like HBase are required to dynamically compute the datanodes it wishes
to place the blocks for a file for higher level of locality. For this purpose there is a need
of a way to give the Namenode a hint in terms of a favoredNodes parameter about the locations
where the client wants to put each block. The proposed solution is a favored nodes parameter
in the addBlock() method and in the create() file method to enable the clients to give the
hints to the NameNode about the locations of each replica of the block. Note that this would
be just a hint and finally the NameNode would look at disk usage, datanode load etc. and decide
whether it can respect the hints or not.

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