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https://issues.apache.org/jira/browse/FLINK-10461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16667357#comment-16667357
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ASF GitHub Bot commented on FLINK-10461:
----------------------------------------
azagrebin commented on a change in pull request #6777: [FLINK-10461] [State
Backends, Checkpointing] Speed up download files when restore from DFS
URL: https://github.com/apache/flink/pull/6777#discussion_r228937420
##########
File path:
flink-core/src/main/java/org/apache/flink/configuration/CheckpointingOptions.java
##########
@@ -115,4 +115,12 @@
.defaultValue(1024)
.withDescription("The minimum size of state data files.
All state chunks smaller than that are stored" +
" inline in the root checkpoint metadata
file.");
+
+ /**
+ * The thread numbers used to download files from DFS in
RocksDBStateBackend.
+ */
+ public static final ConfigOption<Integer> CHECKPOINT_RESTORE_THREAD_NUM
= ConfigOptions
+ .key("state.checkpoint.restore.thread.num")
+ .defaultValue(1)
+ .withDescription("The thread numbers used to download files
from DFS in RocksDBStateBackend.");
Review comment:
also here: `The thread number` without `s`.
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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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