Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/3704
Unfortunately, all newer versions of RocksDB are broken for some functions
when used through the Java API and will segfault when using merge operators.
This is the same version as we previously used in Flink, so there is no
regression. Furthermore, it is possible to use a different compression scheme.
We might at some point try to build our custom version against zlib-1.2.9.
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