Attila Magyar created TEZ-4185:
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Summary: Tez may skip file permission update on intermediate output
Key: TEZ-4185
URL: https://issues.apache.org/jira/browse/TEZ-4185
Project: Apache Tez
Issue Type: Bug
Reporter: Attila Magyar
Assignee: Attila Magyar
Before updating file permissions TEZ check if the permission change is needed
with the following conditional:
{code:java}
if
(!SPILL_FILE_PERMS.equals(SPILL_FILE_PERMS.applyUMask(FsPermission.getUMask(conf))))
{
rfs.setPermission(filename, SPILL_FILE_PERMS);
} {code}
If the config object is changing in the background then setPermission() call
will be skipped.
The rfs file system is always a local file system so there is no need to do
this check beforehand (it doesn't generate an additional NameNode call).
{code:java}
rfs = ((LocalFileSystem)FileSystem.getLocal(this.conf)).getRaw(); {code}
We can remove the if statement and do the permission change unconditionally.
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