Github user wenlong88 commented on the issue:
https://github.com/apache/flink/pull/2345
@StephanEwen
http://rocksdb.org/blog/2609/use-checkpoints-for-efficient-snapshots/
since sst files is immutable once created, in when doing checkpoint,
rocksdb creates hard link for all live sst files to a given directory and copy
manifest to the directory, it cost little IO and the checkpoint dir can be used
as data dir to restore
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