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.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
