GitHub user StefanRRichter opened a pull request:
FLINK-6471 [checkpoint] Fix RocksDBStateBackendTest
`RocksDBStateBackendTest::testCancelRunningSnapshot` sometimes failes. This is cause by a problem that I fixed in `BlockerCheckpointStreamFactory`.
However, it seems like for unknown reason (probably a move refactoring + merge) this class existed twice, with all duplicated code. This PR deletes the copy and uses the one correct implementation everywhere.
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This closes #3837