[jira] [Created] (FLINK-21915) Optimize Execution#finishPartitionsAndUpdateConsumers

["Zhilong Hong (Jira)" <ji...@apache.org>]

Zhilong Hong created FLINK-21915:
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             Summary: Optimize Execution#finishPartitionsAndUpdateConsumers
                 Key: FLINK-21915
                 URL: https://issues.apache.org/jira/browse/FLINK-21915
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Coordination
    Affects Versions: 1.13.0
            Reporter: Zhilong Hong
             Fix For: 1.13.0


Based on the scheduler benchmark {{PartitionReleaseInBatchJobBenchmark}} introduced in FLINK-20612, we find that there's another procedure that has O(N^2) computation complexity: {{Execution#finishPartitionsAndUpdateConsumers}}. 

Once an execution is finished, it will finish all its BLOCKING partitions and update the partition info to all consumer vertices. The procedure can be illustrated as the following pseudo code:
{code:java}
for all Execution in ExecutionGraph:
  for all produced IntermediateResultPartition of the Execution:
    for all consumer ExecutionVertex of the IntermediateResultPartition:
      update or cache partition info{code}
This procedure has O(N^2) complexity in total.

Based on FLINK-21326, the consumed partitions are grouped if they are connected to the same consumer vertices. Therefore, we can update partition info of the entire ConsumedPartitionGroup in batch, rather than one by one. This will decrease the complexity from O(N^2) to O(N).



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