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Posted to issues@flink.apache.org by "Fan Hong (Jira)" <ji...@apache.org> on 2023/04/14 09:40:00 UTC

[jira] [Created] (FLINK-31809) Improve efficiency of ListStateWithCache#snapshotState

Fan Hong created FLINK-31809:
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             Summary: Improve efficiency of ListStateWithCache#snapshotState
                 Key: FLINK-31809
                 URL: https://issues.apache.org/jira/browse/FLINK-31809
             Project: Flink
          Issue Type: Improvement
          Components: Library / Machine Learning
            Reporter: Fan Hong


Current `ListStateWithCache#snapshotState` supports distributed file systems and local file systems. However, in both cases, full data is written to the filesystem (`
dataCacheWriter.writeSegmentsToFiles()`) when `snapshotState` is called. 
 
Moreover, when local file system is used, full data is written to Flink state storage right now, which doubles the costs.



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