ming li created FLINK-24815:
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Summary: Reduce the cpu cost of calculating stateSize during state
allocation
Key: FLINK-24815
URL: https://issues.apache.org/jira/browse/FLINK-24815
Project: Flink
Issue Type: Improvement
Components: Runtime / Checkpointing
Reporter: ming li
When the task failover, we will reassign the state for each subtask and create
a new {{OperatorSubtaskState}} object. At this time, the {{stateSize}} field in
the {{OperatorSubtaskState}} will be recalculated. When using incremental
{{{}Checkpoint{}}}, this field needs to traverse all shared states and then
accumulate the size of the state.
Taking a job with 2000 parallelism and 100 share state for each task as an
example, it needs to traverse 2000 * 100 = 20w times. At this time, the cpu of
the JM scheduling thread will be full.
I think we can try to provide a construction method with {{stateSize}} for
{{OperatorSubtaskState}} or delay the calculation of {{{}stateSize{}}}.
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