Congxian Qiu created FLINK-10461:
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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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