klion26 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_r242554475
##########
File path:
flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBStateBackend.java
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@@ -686,6 +697,17 @@ public RocksDBNativeMetricOptions
getMemoryWatcherOptions() {
return options;
}
+ /**
+ * Gets the thread number will used for downloading files from DFS when
restore.
+ */
+ public int getNumberOfRestoringThreads() {
+ return numberOfRestoringThreads == -1 ?
RocksDBOptions.CHECKPOINT_RESTORE_THREAD_NUM.defaultValue() :
numberOfRestoringThreads;
Review comment:
@zentol thank you for your review. How about add a variable `private final
int undefinedThreadNum = -1` in `RocksDBStateBackend`, change the code in
constructor to `this.numberOfRestoringThreads = undefinedThreadNum` and here
`return numberOfRestoringThreads == undefinedThreadNum ?
RocksDBOptions.CHECKPOINT_RESTORE_THREAD_NUM.defaultValue() :
numberOfRestoringThreads;`
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