Bibin A Chundatt created YARN-5867:
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Summary: 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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