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https://issues.apache.org/jira/browse/FLINK-10461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16632735#comment-16632735
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ASF GitHub Bot commented on FLINK-10461:
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klion26 opened a new pull request #6777: [FLINK-10461] [State Backends,
Checkpointing] Speed up download files when restore from DFS
URL: https://github.com/apache/flink/pull/6777
## What is the purpose of the change
This PR speed up the download files when restore from DFS using multi-thread.
## Brief change log
Use multi-thread from download files when restore from DFS.
## Verifying this change
Add a UT for test exception rethrow in thread pool
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (**no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (**no**)
- The serializers: (**no**)
- The runtime per-record code paths (performance sensitive): (**no**)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (**no**)
- The S3 file system connector: (**no**)
## Documentation
- Does this pull request introduce a new feature? (**no)
- If yes, how is the feature documented? (**not applicable**)
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> 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
> Assignee: Congxian Qiu
> Priority: Major
> Labels: pull-request-available
>
> 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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