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https://issues.apache.org/jira/browse/YARN-3727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14935314#comment-14935314
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Hadoop QA commented on YARN-3727:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  17m 17s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 2 new or modified test files. |
| {color:red}-1{color} | javac |   3m 17s | The patch appears to cause the 
build to fail. |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12735768/YARN-3727.000.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 715dbdd |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/9294/console |


This message was automatically generated.

> 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
>         Attachments: YARN-3727.000.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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