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From "Bibin A Chundatt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6708) Nodemanager container crash after ext3 folder limit
Date Sat, 10 Jun 2017 10:33:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-6708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16045484#comment-16045484
] 

Bibin A Chundatt commented on YARN-6708:
----------------------------------------

FS download takes cares for setting permission for localization directory 
{code}
  Callable<Path> download(Path path, LocalResource rsrc,
      UserGroupInformation ugi) throws IOException {
    diskValidator.checkStatus(new File(path.toUri().getRawPath()));
    return new FSDownloadWrapper(lfs, ugi, conf, path, rsrc);
  }

{code}

{{FSDownload#call}}  *createDir(destDirPath, cachePerms);* only for {{0/14}} so for {{0}}
rights are not set
{code}
 @Override
  public Path call() throws Exception {
    final Path sCopy;
    try {
      sCopy = resource.getResource().toPath();
    } catch (URISyntaxException e) {
      throw new IOException("Invalid resource", e);
    }
    createDir(destDirPath, cachePerms);
{code}
Joint founder + [~varun_saxena] 

> Nodemanager container crash after ext3 folder limit
> ---------------------------------------------------
>
>                 Key: YARN-6708
>                 URL: https://issues.apache.org/jira/browse/YARN-6708
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Bibin A Chundatt
>            Priority: Critical
>
> Configure umask as *027* for nodemanager service user
> and {{yarn.nodemanager.local-cache.max-files-per-directory}} as {{40}}. After 4  *private*
dir localization next directory will be *0/14*
> Local Directory cache manager 
> {code}
> vm2:/opt/hadoop/release/data/nmlocal/usercache/mapred/filecache # l
> total 28
> drwx--x--- 7 mapred hadoop 4096 Jun 10 14:35 ./
> drwxr-s--- 4 mapred hadoop 4096 Jun 10 12:07 ../
> drwxr-x--- 3 mapred users  4096 Jun 10 14:36 0/
> drwxr-xr-x 3 mapred users  4096 Jun 10 12:15 10/
> drwxr-xr-x 3 mapred users  4096 Jun 10 12:22 11/
> drwxr-xr-x 3 mapred users  4096 Jun 10 12:27 12/
> drwxr-xr-x 3 mapred users  4096 Jun 10 12:31 13/
> {code}
> *drwxr-x---* 3 mapred users  4096 Jun 10 14:36 0/ is only *750*
> Nodemanager user will not be able check for localization path exists or not.
> {{LocalResourcesTrackerImpl}}
> {code}
>     case REQUEST:
>       if (rsrc != null && (!isResourcePresent(rsrc))) {
>         LOG.info("Resource " + rsrc.getLocalPath()
>             + " is missing, localizing it again");
>         removeResource(req);
>         rsrc = null;
>       }
>       if (null == rsrc) {
>         rsrc = new LocalizedResource(req, dispatcher);
>         localrsrc.put(req, rsrc);
>       }
>       break;
> {code}
> *isResourcePresent* will always return false and same resource will be localized to {{0}}
to next unique number



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