Hi Ethan, For now, my suggestion is that you can set "preallocate" to false. The description(the link provided by you) of "taskmanager.memory.preallocate" says:
"When taskmanager.memory.off-heap is set to true, then it is advised that this configuration is also set to true." Best, Vino Ethan Li <ethanopensou...@gmail.com> 于2019年12月14日周六 上午5:20写道： > Hi Community, > > I have a question about the taskmanager.memory.preallocate config in the > doc > https://ci.apache.org/projects/flink/flink-docs-release-1.8/ops/config.html#taskmanager-memory-preallocate > > We have large memory box so as it suggested we should use off heap memory > for flink managed memory. And the doc then suggests to > set taskmanager.memory.preallocate to true. However, > > "For streaming setups is is highly recommended to set this value to false > as the core state backends currently do not use the managed memory." > > > Our flink set up is mainly for streaming jobs so I think the above applies > to our case. So should I use off-heap with “preallocate" setting to false? > What would be the impact with these configs? > > > Thank you very much! > > > Best, > Ethan >
