[ 
https://issues.apache.org/jira/browse/YARN-3727?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Junping Du updated YARN-3727:
-----------------------------
    Fix Version/s: 2.8.0

> 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: 2.8.0, 2.7.2, 2.6.2, 3.0.0-alpha1
>
>         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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org

Reply via email to