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https://issues.apache.org/jira/browse/HDFS-6268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13977644#comment-13977644
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Hadoop QA commented on HDFS-6268:
---------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12641332/hdfs-6268-2.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 3 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 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-common-project/hadoop-common 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/6692//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6692//console
This message is automatically generated.
> Better sorting in NetworkTopology#pseudoSortByDistance when no local node is
> found
> ----------------------------------------------------------------------------------
>
> Key: HDFS-6268
> URL: https://issues.apache.org/jira/browse/HDFS-6268
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.4.0
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Priority: Minor
> Attachments: hdfs-6268-1.patch, hdfs-6268-2.patch
>
>
> In NetworkTopology#pseudoSortByDistance, if no local node is found, it will
> always place the first rack local node in the list in front.
> This became an issue when a dataset was loaded from a single datanode. This
> datanode ended up being the first replica for all the blocks in the dataset.
> When running an Impala query, the non-local reads when reading past a block
> boundary were all hitting this node, meaning massive load skew.
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