[GitHub] flink pull request #2062: [FLINK-4000] Fix for checkpoint state restore at M...

[asfgit]

Github user asfgit closed the pull request at:

https://github.com/apache/flink/pull/2062


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[GitHub] flink pull request #2062: [FLINK-4000] Fix for checkpoint state restore at M...

[asavartsov]

GitHub user asavartsov opened a pull request:

https://github.com/apache/flink/pull/2062

[FLINK-4000] Fix for checkpoint state restore at 
MessageAcknowledgingSourceBase

As says documentation for MessageAcknowledgingSourceBase.restoreState() 

This method is invoked when a function is executed as part of a recovery 
run. Note that restoreState() is called before open().

So current implementation

1. Fails on restoreState with NullPointerException, jobs fail to restart.
2. Does not restore anything because following open erases all checkpoint 
data immediately.
3. As consequence, violates exactly once rule because processed but not 
acknowledged list erased.

Proposed change fixes that.

You can merge this pull request into a Git repository by running:

$ git pull https://github.com/asavartsov/flink FLINK-4000

Alternatively you can review and apply these changes as the patch at:

https://github.com/apache/flink/pull/2062.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

This closes #2062


commit 58fb7df0b2d1dd68a90f4088fbde10874eb290b6
Author: Alexey Savartsov 
Date:   2016-06-01T23:23:53Z

[FLINK-4000] Fix for checkpoint state restore at 
MessageAcknowledgingSourceBase

As says documentation for MessageAcknowledgingSourceBase.restoreState() 

This method is invoked when a function is executed as part of a recovery 
run. Note that restoreState() is called before open().

So current implementation

1. Fails on restoreState with NullPointerException, jobs fail to restart.
2. Does not restore anything because following open erases all checkpoint 
data immediately.
3. As consequence, violates exactly once rule because processed but not 
acknowledged list erased.

Proposed change fixes that.




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