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https://issues.apache.org/jira/browse/HDFS-4870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13673490#comment-13673490
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Hadoop QA commented on HDFS-4870:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12585903/HDFS-4870.001.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 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}. 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-hdfs-project/hadoop-hdfs:
org.apache.hadoop.hdfs.server.balancer.TestBalancerWithNodeGroup
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/4469//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/4469//console
This message is automatically generated.
> periodically re-resolve hostnames in included and excluded datanodes list
> -------------------------------------------------------------------------
>
> Key: HDFS-4870
> URL: https://issues.apache.org/jira/browse/HDFS-4870
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.0.5-alpha
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Priority: Minor
> Attachments: HDFS-4870.001.patch
>
>
> We currently only resolve the hostnames in the included and excluded
> datanodes list once-- when the list is read. The rationale for this is that
> in big clusters, DNS resolution for thousands of nodes can take a long time
> (when generating a datanode list in getDatanodeListForReport, for example).
> However, if the DNS information changes for one of these hosts, we should
> reflect that. A background thread could do these DNS resolutions every few
> minutes without blocking any foreground operations.
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