Github user NicoK commented on the issue:
https://github.com/apache/flink/pull/4456
yes, seems like it was changed from `-Xmx800m` to `-Xmx1536m` by FLINK-6128
and again to `-Xmx2048m` by FLINK-7004 without changing it here. The question
should rather be whether we need the specialised options anyway or whether we
can remove them.
I tested the latter (removing the `<argLine>...</argLine>` lines but
keeping the `<forkCount>1</forkCount>`) and then the root pom's values are
inherited which may be a better solution anyway.
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