[jira] [Created] (FLINK-4992) Expose String parameter for timers in Timely functions and TimerService

["Gyula Fora (JIRA)" <ji...@apache.org>]

Gyula Fora created FLINK-4992:
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             Summary: Expose String parameter for timers in Timely functions and TimerService
                 Key: FLINK-4992
                 URL: https://issues.apache.org/jira/browse/FLINK-4992
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
    Affects Versions: 1.2.0
            Reporter: Gyula Fora
            Priority: Minor


Currently it is very hard to register and execute multiple different types timers from the same user function because timers don't carry any metadata.

We propose to extend the timer registration and onTimer logic by attaching a String argument so users of these features can implement functionality that depends on this addtitional metadata.

The proposed new methods:

In the TimerService:
void registerProcessingTimeTimer(long time, String label);
void registerEventTimeTimer(long time, String label);

In the TimelyFunctions:
void onTimer(long timestamp, String label, TimeDomain timeDomain, TimerService timerService...);

This extended functionality can be mapped to a String namespace for the internal timer service. I suggest we don't use the term "namespace" here because it just complicates things for the users, I think "label" or "id" or "name" is much simpler to understand.




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