Deegue opened a new pull request #2550:
URL: https://github.com/apache/hadoop/pull/2550
History Server searches applications by visiting `history file`. If we move
`history file` to `/done` before `conf file`, at the same time, stop the
History Server, however, `conf file` is still in `/intermediate`. When we start
History Server again, this `conf file` won't be moved to `/done` because ` the
history file` is no longer in `/intermediate`. In this case, `conf file` is
trash.
When we move `conf file` first, stop the History Server, however, `conf
file` isn't exist but `history file` does. When we start History Server again,
it'll try to move the `conf file` and throw FileNotFound exception. In this
case, `history file` is trash.
Trash(outdated `conf file` and `history file`) will pile up in
`/intermediate` directory util we delete them manually or it'll slow down
History Server.
Our solution is changing move order and making file exist check.
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