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https://issues.apache.org/jira/browse/FLINK-19011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jiayi Liao closed FLINK-19011.
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Resolution: Won't Fix
> Parallelize the restore operation in OperatorStateBackend
> ----------------------------------------------------------
>
> Key: FLINK-19011
> URL: https://issues.apache.org/jira/browse/FLINK-19011
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Checkpointing
> Affects Versions: 1.11.1
> Reporter: Jiayi Liao
> Priority: Major
> Labels: stale-major
>
> To restore the states, union state needs to read state handles produced by
> all operators. And currently during the restore operation, Flink iterates the
> state handles one by one, which could last tens of minutes if the magnitude
> of state handles exceeds ten thousand.
> To accelerate the process, I propose to parallelize the random reads on HDFS
> and deserialization. We can create a runnable for each state handle and let
> it return the metadata and deserialized data, which can be aggregated in main
> thread.
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