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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4870) periodically re-resolve hostnames in included and excluded datanodes list
Date Sat, 02 May 2015 04:29:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14524646#comment-14524646
] 

Hadoop QA commented on HDFS-4870:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | patch |   0m  0s | The patch command could not apply the patch during
dryrun. |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12585903/HDFS-4870.001.patch
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| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / f1a152c |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/10546/console |


This message was 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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