[jira] [Commented] (MAPREDUCE-7017) Too many times of meaningless invocation in TaskAttemptImpl#resolveHosts

["Hadoop QA (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-7017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17167599#comment-17167599 ] 

Hadoop QA commented on MAPREDUCE-7017:
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| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} docker {color} | {color:red} 16m 58s{color} | {color:red} Docker failed to build yetus/hadoop:e277d338da2. {color} |
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|| Subsystem || Report/Notes ||
| GITHUB PR | https://github.com/apache/hadoop/pull/309 |
| JIRA Issue | MAPREDUCE-7017 |
| Console output | https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-309/2/console |
| versions | git=2.17.1 |
| Powered by | Apache Yetus 0.12.0 https://yetus.apache.org |


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> Too many times of meaningless invocation in TaskAttemptImpl#resolveHosts
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7017
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7017
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mr-am
>    Affects Versions: 3.0.0-alpha4
>            Reporter: jiayuhan-it
>            Assignee: jiayuhan-it
>            Priority: Major
>         Attachments: MAPREDUCE-7017.001.patch
>
>
>   MRAppMaster uses {{TaskAttemptImpl::resolveHosts}} to determine the dataLocalHosts for each task when the location of data split is IP, which will call a lot of times ( taskNum * dfsReplication) of function {{InetAddress::getByName}} and most of the funcition calls are redundant.  When the job has a great number of tasks and the speed of DNS resolution is not fast enough, it will take a lot of time at this stage before the job running.



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