I submit a Flink job to Yarn, Flink version is 1.9, and the submission mod is per-Job, but i find the Maximum heap size in taskmanager.log is always lower than the value of 'xmx' in Java Options, details can be seen in the picture, i want to know what is the reason? taskmanager.log
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One possible guess is that you have different definitions of megabyte involved. For example 1024 kilobytes versus 1000 kilobytes – PiRocks Jun 14 '20 at 10:38
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One of the [survivor spaces](https://docs.oracle.com/javase/8/docs/technotes/guides/vm/gctuning/generations.html) is always empty and not included in the calculation of `Runtime.maxMemory`. See [this question](https://stackoverflow.com/questions/27005220/why-does-my-garbage-collection-log-show-3-8gb-as-the-max-available-heap-size-whi). – apangin Jun 14 '20 at 11:22
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First, i checked the definitions of megabyte involed, both of them use 1024 kilobytes; And secondly, the value is sitll not equal to the value of Runtime.maxMemory after i substract the space of one survivor space from -xmx. – H.Die Jun 15 '20 at 01:52