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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3727) For better error recovery, check if the directory exists before using it for localization.
Date Wed, 30 Sep 2015 16:27:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-3727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14937472#comment-14937472
] 

Hudson commented on YARN-3727:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #2407 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2407/])
YARN-3727. For better error recovery, check if the directory exists (jlowe: rev 854d25b0c30fd40f640c052e79a8747741492042)
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/TestLocalResourcesTrackerImpl.java
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/ResourceLocalizationService.java
* hadoop-yarn-project/CHANGES.txt
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/LocalResourcesTrackerImpl.java
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/LocalResourcesTracker.java
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/TestResourceLocalizationService.java


> For better error recovery, check if the directory exists before using it for localization.
> ------------------------------------------------------------------------------------------
>
>                 Key: YARN-3727
>                 URL: https://issues.apache.org/jira/browse/YARN-3727
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>    Affects Versions: 2.7.0
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>             Fix For: 2.7.2, 2.6.2
>
>         Attachments: YARN-3727.000.patch, YARN-3727.001.patch
>
>
> For better error recovery, check if the directory exists before using it for localization.
> We saw the following localization failure happened due to existing cache directories.
> {code}
> 2015-05-11 18:59:59,756 INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService:
DEBUG: FAILED { hdfs://XXXX/XXXXX/libjars/1234.jar, 1431395961545, FILE, null }, Rename cannot
overwrite non empty destination directory /XXXX/8/yarn/nm/usercache/XXXX/filecache/21637
> 2015-05-11 18:59:59,756 INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.LocalizedResource:
Resource hdfs://XXXX/XXXXX/libjars/1234.jar(->/XXXX/8/yarn/nm/usercache/XXXX/filecache/21637/1234.jar)
transitioned from DOWNLOADING to FAILED
> {code}
> The real cause for this failure may be disk failure, LevelDB operation failure for {{startResourceLocalization}}/{{finishResourceLocalization}}
or others.
> I wonder whether we can add error recovery code to avoid the localization failure by
not using the existing cache directories for localization.
> The exception happened at {{files.rename(dst_work, destDirPath, Rename.OVERWRITE)}} in
FSDownload#call. Based on the following code, after the exception, the existing cache directory
used by {{LocalizedResource}} will be deleted.
> {code}
> try {
>      .........
>       files.rename(dst_work, destDirPath, Rename.OVERWRITE);
>     } catch (Exception e) {
>       try {
>         files.delete(destDirPath, true);
>       } catch (IOException ignore) {
>       }
>       throw e;
>     } finally {
> {code}
> Since the conflicting local directory will be deleted after localization failure,
> I think it will be better to check if the directory exists before using it for localization
to avoid the localization failure.



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