[GitHub] [flink] dawidwys edited a comment on pull request #17440: [FLINK-24468][runtime] Wait for the channel activation before creating partition request client

[GitBox]

dawidwys edited a comment on pull request #17440:
URL: https://github.com/apache/flink/pull/17440#issuecomment-941031617


   I found the reason why the exception was swallowed. Please see: 
https://issues.apache.org/jira/browse/FLINK-24515.
   
   I think we should not swallow exceptions if debloating fails. Therefore I'd 
remove the `try/catch` block and replace the `submit` with `execute` in 
`org.apache.flink.streaming.runtime.tasks.StreamTask#scheduleBufferDebloater`:
   
   ```
       private void scheduleBufferDebloater() {
           // See https://issues.apache.org/jira/browse/FLINK-23560
           // If there are no input gates, there is no point of calculating the 
throughput and running
           // the debloater. At the same time, for SourceStreamTask using 
legacy sources and checkpoint
           // lock, enqueuing even a single mailbox action can cause 
performance regression. This is
           // especially visible in batch, with disabled checkpointing and no 
processing time timers.
           if (getEnvironment().getAllInputGates().length == 0) {
               return;
           }
           systemTimerService.registerTimer(
                   systemTimerService.getCurrentProcessingTime() + 
bufferDebloatPeriod,
                   timestamp ->
                           mainMailboxExecutor.execute(
                                   () -> {
                                       debloat();
                                       scheduleBufferDebloater();
                                   },
                                   "Buffer size recalculation"));
       }
   ```
   
   As for the `waitForActivation`, I need to think about it for a bit more.


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