GitHub user tillrohrmann opened a pull request:
https://github.com/apache/flink/pull/622
[FLINK-1925] Fixes blocked method submitTask on the TM
The ```submitTask``` method which processes the ```SubmitTask``` message
blocks while downloading the task jars from the ```JobManager```. Depending on
the number of TMs and jars, this can take a long time.
In order to get rid of the blocking call the ```submitTask``` method is
split up into two phases: TDD reception with eager acknowledgement and TDD
instantiation with a subsequent state update message. The TDD instantiation is
executed concurrently in a future. Upon finishing the instantiation, an
```UpdateTaskExecutionState``` message with ```ExecutionState.RUNNING``` is
sent to the JM. This implies that the state of the ```Execution``` is not
directly set to ```RUNNING``` by the ```SubmitTask``` future handler which is
created in ```Execution.deployToSlot```.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tillrohrmann/flink fixSubmitTask
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/622.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 #622
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commit cccb6f2dc9ba506b117ba49f92b561cf35c60b2a
Author: Till Rohrmann <trohrm...@apache.org>
Date: 2015-04-23T14:13:22Z
[FLINK-1925] [runtime] Splits the processing of the SubmitTask message into
two phases: TDD reception with eager acknowledgement and TDD instantiation with
a subsequent state update message.
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