[jira] [Created] (YARN-6319) race condition between deleting app dir and deleting container dir

["Hong Zhiguo (JIRA)" <ji...@apache.org>]

Hong Zhiguo created YARN-6319:
---------------------------------

             Summary: race condition between deleting app dir and deleting container dir
                 Key: YARN-6319
                 URL: https://issues.apache.org/jira/browse/YARN-6319
             Project: Hadoop YARN
          Issue Type: Bug
          Components: nodemanager
            Reporter: Hong Zhiguo
            Assignee: Hong Zhiguo


Last container (on one node) of one app complete
    |    --> triggers async deletion of container dir (container cleanup)
    |    --> triggers async deletion of app dir (app cleanup)

For LCE, deletion is done by container-executor. The "app cleanup" lists sub-dir (step 1), and then unlink items one by one(step 2).   If a file is deleted by "container cleanup" between step 1 and step2, it'll report below error and breaks the deletion.
{code}
ContainerExecutor: Couldn't delete file $LOCAL/usercache/$USER/appcache/application_1481785469354_353539/container_1481785469354_353539_01_000028/$FILE - No such file or directory
{code}

This app dir then escape the cleanup. And that's why we always have many app dirs left there.

solution 1: just ignore the error without breaking in container-executor.c::delete_path()
solution 2: use a lock to serialize the cleanup of same app dir.
solution 3: backoff and retry on error

Suggestions are welcome.





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