Github user wenlong88 commented on the issue:
https://github.com/apache/flink/pull/2345
@aljoscha we use rocksdb checkpoint machanism to do the semi-async
checkpoint, which use hard link to make checkpoint, cost quite a little IO and
time in synchronized phrase. This works well even when the state is large. and
using the checkpoint dir to restore is also very fast, since no extra IO need,
if the task manager didn't changed.
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