GitHub user zentol opened a pull request:
https://github.com/apache/flink/pull/5657
[FLINK-8887][tests] Add single retry in MiniClusterClient
## What is the purpose of the change
This PR presents a test workaround for race-conditions in FLIP-6 (most
notably FLINK-8887). Basically, every `MiniClusterClient` call is retried
*once* after 500ms in case of certain exceptions.
**This is only a band-aid until a proper fix is in place** so we can
finally continue merging more test ports.
## Brief change log
* add `guardWithSingleRetry` convenience method
* add `ScheduledExecutor` to `MiniClusterClient`
* guard all calls to the `MiniCluster`
## Verifying this change
The change can be verified by cherry-picking [this
branch](https://github.com/zentol/flink/tree/8797) and running the
`AbstractOperatorRestoreTestBase`. Before this change there was always 1-2
tests failing, whereas now none should fail.
/cc @aljoscha @GJL
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zentol/flink 8887_bandaid
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/5657.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 #5657
commit f685fad6731b7c1774b247985a446260ea285663
Author: zentol
Date: 2018-03-07T14:02:05Z
[FLINK-8887][tests] Add single retry in MiniClusterClient
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