GitHub user tillrohrmann opened a pull request:
https://github.com/apache/flink/pull/4689
[FLINK-7655] [flip6] Set fencing token to null if not leader
## What is the purpose of the change
This commit changes the fencing behaviour such that a component which is
not the
leader will set its fencing token to null. This distinction allows to throw
different
exceptions depending on whether it is a token mismatch or whether the
receiver has
no fencing token set (== not being the leader).
## Brief change log
- allow the fencing token to be null in `FencedRpcEndpoint`
- allow `FencedAkkaInvocationHandler` to send a `null` fencing token
- filter out messages if component is not a leader in `FencedAkkaRpcActor`
- Adapt `Dispatcher`, `ResourceManager` and `JobMaster` to set fencing
token to `null` at start-up
## Verifying this change
This change is already covered by existing tests, such as
`FencedRpcEndpointTest` and `AsyncCallsTest`.
## 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)
## Documentation
- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (not applicable)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tillrohrmann/flink defaultLeaderIds
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/4689.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 #4689
----
commit c4bf767afcc28f96fbfed35cc97ce58b5de009fa
Author: Till Rohrmann <[email protected]>
Date: 2017-09-20T15:39:35Z
[FLINK-7655] [flip6] Set fencing token to null if not leader
This commit changes the fencing behaviour such that a component which is
not the
leader will set its fencing token to null. This distinction allows to throw
different
exceptions depending on whether it is a token mismatch or whether the
receiver has
no fencing token set (== not being the leader).
----
---
