I using 1.2.0 release, so I read the document in
https://ci.apache.org/projects/flink/flink-docs-release-1.2/setup/savepoints.html.
It means it can recover from the savepoint even if I change the parallelism.
How does flink implement it? 
For example using rocksdb+hdfs as state backend,  flink just download all
rocksdb to local?



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