Wangda Tan commented on YARN-4405:

Thanks [~sunilg].

Addressed #2/#3. For #1, I was using 
fs.create(newTmpPath, true);
So old tmp file will be always overwritten by the new one.

Attaching ver.4 patch.

> Support node label store in non-appendable file system
> ------------------------------------------------------
>                 Key: YARN-4405
>                 URL: https://issues.apache.org/jira/browse/YARN-4405
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api, client, resourcemanager
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-4405.1.patch, YARN-4405.2.patch, YARN-4405.3.patch, 
> YARN-4405.4.patch
> Existing node label file system store implementation uses append to write 
> edit logs. However, some file system doesn't support append, we need add an 
> implementation to support such non-appendable file systems as well. 

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