[jira] [Created] (FLINK-4866) Make Trigger.clear() Abstract to Enforce Implementation

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-4866:
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             Summary: Make Trigger.clear() Abstract to Enforce Implementation
                 Key: FLINK-4866
                 URL: https://issues.apache.org/jira/browse/FLINK-4866
             Project: Flink
          Issue Type: Bug
          Components: Streaming
            Reporter: Aljoscha Krettek


If the method is not abstract implementors of custom triggers will not realise that it could be necessary and they will likely not clean up their state/timers properly.



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