[jira] [Created] (FLINK-18991) Optimize reading InputChannel state

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

Roman Khachatryan created FLINK-18991:
-----------------------------------------

             Summary: Optimize reading InputChannel state
                 Key: FLINK-18991
                 URL: https://issues.apache.org/jira/browse/FLINK-18991
             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 ->  strictly after reading output; when state is *consumed*, requests partitions
    SingleInputGate.readRecoveredState -> submits a task to an executor from main task thread; loop through special channels
        RecoveredInputChannel.readRecoveredState  -> loop while has data; buffer = bufferManager.requestBufferBlocking();
                where bufferManager = new BufferManager(inputGate.getMemorySegmentProvider(), this, 0);
            ChannelStateReader.readInputData  
{code}
Proposed call chain:
{code:java}
StreamTask.readRecoveredChannelState ->  strictly after reading output; when state is *consumed*, requests partitionsStreamTask.readRecoveredChannelState ->  strictly after reading output; when state is *consumed*, requests partitions    ChannelStateReader.readInputData (another thread, maybe same executor, maybe change injection)        loop through state handles ordererd by handle, offset        request buffer from channel        pass buffer to RecoveredInputChannel.onRecoveredStateBuffer
{code}
  Depends on FLINK-18989



--
This message was sent by Atlassian Jira
(v8.3.4#803005)