Roman Khachatryan created FLINK-18991:
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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
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