ratorStreamTask should implement cancelTask() and finishTask()
</li>
<li>[<a href='https://issues.apache.org/jira/browse/FLINK-20554'>FLINK-20554</a>] -         The Checkpointed Data Size of the Latest Completed Checkpoint is incorrectly displayed on the Overview page of the UI
</li>
</ul>
<h2>        New Feature
</h2>
<ul>
<li>[<a href='https://issues.apache.org/jira/browse/FLINK-19934'>FLINK-19934</a>] -         [FLIP-27 source] add new API: SplitEnumeratorContext.runInCoordinatorThread(Runnable)
</li>
</