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[jira] [Created] (FLINK-10461) Speed up download file procedure when restore

Congxian Qiu created FLINK-10461:

             Summary: Speed up download file procedure when restore 
                 Key: FLINK-10461
                 URL: https://issues.apache.org/jira/browse/FLINK-10461
             Project: Flink
          Issue Type: Improvement
          Components: State Backends, Checkpointing
            Reporter: Congxian Qiu

In the current master branch, the restore will download file from DFS, the download procedure are single-thread, this could speed up by using multi-thread for downloading states from DFS.


In my company, the states will come to some terabytes, so the restore procedure will become a litter slow, after a bit digging, I find download states from DFS using single thread, this could using multi-thread for speed up.

I test the time used for download states from DFS with ~2 terabytes states. With single thread it used 640+s, and 130+s when using 5 threads for download.

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