[jira] [Created] (FLINK-12887) Schedule UnfencedMessage would lost envelope info

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

TisonKun created FLINK-12887:
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             Summary: Schedule UnfencedMessage would lost envelope info 
                 Key: FLINK-12887
                 URL: https://issues.apache.org/jira/browse/FLINK-12887
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Coordination
    Affects Versions: 1.9.0
            Reporter: TisonKun


We provide {{runAsync}}, {{callAsync}} and {{scheduleRunAsync}} for {{MainThreadExecutable}}, while providing {{runAsyncWithoutFencing}} and {{callAsyncWithoutFencing}} additionally for {{FencedMainThreadExecutable}}.

Let's think about a case when we want to schedule a unfenced runnable or any other unfenced message(currently, we don't have such code path but it's semantically valid.). 

1. {{FencedAkkaRpcActor}} received an unfenced runnable with delay
2. It extracted the runnable from unfenced message and call {{super.handleRpcMessage}}.
3. {{AkkaRpcActor}} enveloped the message and schedule it by {{AkkaRpcActor#L410}}.

However, {{FencedAkkaRpcActor#envelopeSelfMessage}} was called for envelope. Thus the unfenced message now become a fenced message.

We can anyway implement {{scheduleRunAsyncWithoutFencing}} to schedule unfenced message directly by {{actorsystem.scheduler.scheduleOnce(..., dispatcher)}}, but with current codebase I notice that {{RunAsync}} has a wried {{atTimeNanos}}(i.e., delay) property. Ideally how to schedule a message is shown on what params ScheduleExecutorService called with, at least we cannot extract an unfenced message and envelop it into a fence message and then schedule it, which goes into wrong semantic.

cc [~till.rohrmann]



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