GitHub user NicoK opened a pull request:
https://github.com/apache/flink/pull/5914
[FLINK-9256][network] fix NPE in SingleInputGate#updateInputChannel() for
non-credit based flow control
## What is the purpose of the change
`SingleInputGate#updateInputChannel()` fails to update an unknown into a
remote partition without credit based flow control due to a
`NullPointerException` resulting from `networkBufferPool == null`.
## Brief change log
- make `SingleInputGate` aware of credit-based flow control
- only try to assign exclusive buffers in `SingleInputGate` if credit-based
- replace some Mockito use in `SingleInputGateTest`
## Verifying this change
This change added tests and can be verified as follows:
- extend `SingleInputGateTest` with credit and non-credit based test
variants
- add a test for `SingleInputGate#updateInputChannel()` in both modes
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): **no**
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: **no**
- The serializers: **no**
- The runtime per-record code paths (performance sensitive): **no**
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: **no**
- The S3 file system connector: **no**
## Documentation
- Does this pull request introduce a new feature? (yes / no)
- If yes, how is the feature documented? (not applicable / docs /
JavaDocs / not documented)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/NicoK/flink flink-9256
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/5914.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 #5914
----
commit c5fb35ace872c5479a037ec2e42b1cefdfe502a8
Author: Nico Kruber <nico@...>
Date: 2018-04-25T16:28:48Z
[FLINK-9256][network] fix NPE in SingleInputGate#updateInputChannel() for
non-credit based flow control
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