[jira] [Created] (FLINK-18990) Optimize reading ResultSubpartition state

["Roman Khachatryan (Jira)" <ji...@apache.org>]

Roman Khachatryan created FLINK-18990:
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             Summary: Optimize reading ResultSubpartition state
                 Key: FLINK-18990
                 URL: https://issues.apache.org/jira/browse/FLINK-18990
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Task
            Reporter: Roman Khachatryan
            Assignee: Roman Khachatryan
             Fix For: 1.12.0


Curently, channel state is read not sequentially.

Inverting control would make it more efficient.

Current call chain:

 
{code:java}
StreamTask.readRecoveredChannelState  
    ResultPartition.readRecoveredState - loop through subpartitions
        PipelinedSubpartition.readRecoveredState - loop while have data; bufferBuilder = parent.getBufferPool().requestBufferBuilderBlocking(subpartitionInfo.getSubPartitionIdx());
            ChannelStateReader.readOutputData   {code}
Proposed call chain:

 
{code:java}
StreamTask.readRecoveredChannelState
 ChannelStateReader.readOutputData loop through state handles ordererd by handle, offset
 request buffer in the same way: BufferBuilder bufferBuilder = resPart.getBufferPool().requestBufferBuilderBlocking(subpartitionInfo.getSubPartitionIdx());
 pass to resPart.getSubpartition(idx).add(BufferConsumer, boolean, boolean)
{code}
 

 

Depends on FLINK-18989



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