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This looks almost good to go. I posted one comment which is pretty minor. Can 
you also add a unit test to ensure that a checkpoint gets written when you call 
close?


flume-ng-channels/flume-file-channel/src/main/java/org/apache/flume/channel/file/Log.java
<https://reviews.apache.org/r/30330/#comment115673>

    Since the lock is re-entrant, it is fine to acquire the exclusive lock at 
this point. I also think you should set open=false before writing the 
checkpoint to ensure that no write ops happen after (it is fine if it does, 
there would only be a small replay). Also not locking exclusively can cause a 
checkpoint to get written, followed by a scheduled checkpoint - which is pretty 
useless.


- Hari Shreedharan


On Jan. 27, 2015, 10 p.m., Roshan Naik wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/30330/
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> 
> (Updated Jan. 27, 2015, 10 p.m.)
> 
> 
> Review request for Flume.
> 
> 
> Bugs: FLUME-2595
>     https://issues.apache.org/jira/browse/FLUME-2595
> 
> 
> Repository: flume-git
> 
> 
> Description
> -------
> 
> FC to auto checkpoint on shutdown. Added an option to disable it if needed. 
> updated docs. 
> 
> 
> Diffs
> -----
> 
>   
> flume-ng-channels/flume-file-channel/src/main/java/org/apache/flume/channel/file/FileChannel.java
>  61c353a 
>   
> flume-ng-channels/flume-file-channel/src/main/java/org/apache/flume/channel/file/FileChannelConfiguration.java
>  f8c0378 
>   
> flume-ng-channels/flume-file-channel/src/main/java/org/apache/flume/channel/file/Log.java
>  0e9171e 
>   flume-ng-doc/sphinx/FlumeUserGuide.rst bcadc2d 
> 
> Diff: https://reviews.apache.org/r/30330/diff/
> 
> 
> Testing
> -------
> 
> verified manually with the option enabled & disabled
> 
> 
> Thanks,
> 
> Roshan Naik
> 
>

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