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Piotr Nowojski updated FLINK-24815: ----------------------------------- Component/s: Runtime / State Backends > 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, Runtime / State Backends > Affects Versions: 1.14.0 > Reporter: ming li > Priority: Major > > 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{}}}. -- This message was sent by Atlassian Jira (v8.20.1#820001)