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https://issues.apache.org/jira/browse/FLINK-8398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16319741#comment-16319741
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ASF GitHub Bot commented on FLINK-8398:
---------------------------------------
GitHub user tzulitai opened a pull request:
https://github.com/apache/flink/pull/5268
[FLINK-8398] [kinesis, tests] Harden KinesisDataFetcherTest unit tests
## What is the purpose of the change
Prior to this PR, many of the `KinesisDataFetcherTest` unit tests relied on
thread sleeps to wait until a certain operation occurs to allow the test to
pass. This test behaviour is very flaky, and should be replaced with
`OneShotLatch`.
## Brief change log
- 94b4591: Several minor cleanups of confusing implementations / code
smells in the `KinesisDataFetcherTest` and related test classes. The commit
message explains what exactly was changed.
- 547d19f: Remove thread sleeps in unit tests, and replace them with
`OneShotLatch`.
## Verifying this change
No test coverage should have been affected by this change.
The existing tests in `KinesisDataFetcherTest` verifies this.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / *no*)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / *no*)
- The serializers: (yes / *no* / don't know)
- The runtime per-record code paths (performance sensitive): (yes / *no*
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / *no* / don't know)
- The S3 file system connector: (yes / *no* / don't know)
## 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/tzulitai/flink FLINK-8398
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/5268.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 #5268
----
commit 94b45919afa5a3ec3ce68c45e57f7989397f9640
Author: Tzu-Li (Gordon) Tai <tzulitai@...>
Date: 2018-01-10T02:11:31Z
[FLINK-8398] [kinesis, tests] Cleanup confusing implementations in
KinesisDataFetcherTest and related classes
The previous implementation of the TestableKinesisDataFetcher was
confusing in various ways, causing it hard to be re-used for other
tests. This commit contains the following various cleaups:
- Remove confusing mocks of source context and checkpoint lock. We now
allow users of the TestableKinesisDataFetcher to provide a source
context, which should provide the checkpoint lock.
- Remove override of emitRecordAndUpdateState(). Strictly speaking, that
method should be final. It was previously overriden to allow
verifying how many records were output by the fetcher. That
verification would be better implemented within a mock source context.
- Properly parameterize the output type for the
TestableKinesisDataFetcher.
- Remove use of PowerMockito in KinesisDataFetcherTest.
- Use CheckedThreads to properly capture any exceptions in fetcher /
consumer threads in unit tests.
- Use assertEquals / assertNull instead of assertTrue where-ever
appropriate.
commit 547d19f9196512231661f427f3792f2e1f831339
Author: Tzu-Li (Gordon) Tai <tzulitai@...>
Date: 2018-01-10T05:41:49Z
[FLINK-8398] [kinesis, tests] Stabilize flaky KinesisDataFetcherTests
Prior to this commit, several unit tests in KinesisDataFetcherTest
relied on sleeps to wait until a certain operation happens, in order for
the test to pass.
This commit removes those sleeps and replaces the test behaviours with
OneShotLatches.
----
> Stabilize flaky KinesisDataFetcherTests
> ---------------------------------------
>
> Key: FLINK-8398
> URL: https://issues.apache.org/jira/browse/FLINK-8398
> Project: Flink
> Issue Type: Bug
> Components: Kinesis Connector, Tests
> Affects Versions: 1.4.0, 1.5.0
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Tzu-Li (Gordon) Tai
> Fix For: 1.5.0, 1.4.1
>
>
> The unit tests in {{KinesisDataFetcherTest}} have very flaky implementations.
> They rely on on thread sleeps to wait for a certain operation to happen,
> which can easily miss and cause tests to fail.
> Although there isn't any reports of consistent failures on these tests yet
> (as far as I am aware of), they can easily surface in the future.
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