Github user NicoK commented on the issue: https://github.com/apache/flink/pull/4481 ok, one test fixed, the other is not so simple but maybe @tillrohrmann can help with it: Inside `ContaineredTaskManagerParameters#create()`, we calculate the amount of off-heap space that we need and for yarn, we use exactly this amount for setting the `-XX:MaxDirectMemorySize` JVM property without letting room for other components and libraries. This worked so far for the network buffers when memory as a whole was set to off-/on-heap and the flink-reserved memory was not completely used. Now, however, if set to on-heap, the `-XX:MaxDirectMemorySize` is too sharp. I'm unsure about the solutions: 1) remove setting `-XX:MaxDirectMemorySize` and let the JVM adjust automatically, or 2) add some "sane" default to our off-heap usage? The same may apply to Mesos if `ResourceProfile(cpuCores, heapMemoryInMB, directMemoryInMB, nativeMemoryInMB)` is used. At the moment, only the other constructors are used leading to solution 1.
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