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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11676) Add API to NetworkTopology for getting all racks
Date Sat, 07 Mar 2015 08:15:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14351476#comment-14351476
] 

Hadoop QA commented on HADOOP-11676:
------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12703217/HADOOP-11676.patch
  against trunk revision 608ebd5.

    {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-common-project/hadoop-common
hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.TestRollingUpgrade
                  org.apache.hadoop.hdfs.server.balancer.TestBalancer

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/5879//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/5879//console

This message is automatically generated.

> Add API to NetworkTopology for getting all racks
> ------------------------------------------------
>
>                 Key: HADOOP-11676
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11676
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Walter Su
>            Assignee: Walter Su
>         Attachments: HADOOP-11676.patch
>
>
> The existing two NetworkTopology.chooseRandom(..) API support choosing node from scope
and choosing outside scope. BlockPlacementPolicyDefault class use these two API to choose
node from one rack or choose outside one rack.
> We want to implement a new placement policy called BlockPlacementPolicyFaultTolerant
which tries its best to place replicas to most racks. To achieve this, We need to know how
many replicas each rack has. And first, we need to get all racks.



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