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https://issues.apache.org/jira/browse/YARN-5867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15653868#comment-15653868
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Bibin A Chundatt commented on YARN-5867:
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*Solution*
# We can check and try creation of localdir before testdir() all dir with
*0755* permission
# Should create Random localdir only if the localdir exits , So that local dir
will be considered as bad.
In my opinion should use *Solution 1* makes NM auto recoverable.Thoughts?
> DirectoryCollection#checkDirs can cause incorrect permission of nmlocal dir
> ---------------------------------------------------------------------------
>
> Key: YARN-5867
> URL: https://issues.apache.org/jira/browse/YARN-5867
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Bibin A Chundatt
> Assignee: Bibin A Chundatt
>
> Steps to reproduce
> ===============
> # Set umask to 027 for user
> # Start nodemanager with nmlocal dir configured
> nmlocal dir permission is *755*
> {{LocalDirsHandlerService#serviceInit}}
> {code}
> FsPermission perm = new FsPermission((short)0755);
> boolean createSucceeded = localDirs.createNonExistentDirs(localFs, perm);
> createSucceeded &= logDirs.createNonExistentDirs(localFs, perm);
> {code}
> # After startup delete the nmlocal dir and wait for {{MonitoringTimerTask}}
> to run (simulation using delete)
> # Now check the permission of {{nmlocal dir}} will be *750*
> *Root Cause*
> {{DirectoryCollection#testDirs}} checks as following
> {code}
> // create a random dir to make sure fs isn't in read-only mode
> verifyDirUsingMkdir(testDir);
> {code}
> which cause a new Random directory to be create in {{localdir}} using
> {{DiskChecker.checkDir(dir)}} -> {{!mkdirsWithExistsCheck(dir)}} causing the
> nmlocal dir to be created with wrong permission. *750*
> Few application fail to container launch due to permission denied.
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