if key of keyby operator is unbound ,the memor...
# troubleshootingu
田明刚
05/26/2023, 10:37 AMif key of keyby operator is unbound ,the memory usage will grow for ever ?
plusone 2
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David Anderson
05/26/2023, 2:04 PMNot necessarily. If you are holding onto state for every key (and never clearing it), then you'll have unbounded state. And if on top of that you are using a heap-based state backend, then memory usage will grow forever.
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田明刚
05/27/2023, 12:46 AMThanks
田明刚
05/27/2023, 2:36 AMI am using rocksdb state backend, after processing logic in onTimer method , i clear the state,will the memory usage grow forever?
d
David Anderson
05/27/2023, 1:46 PMThat should be fine — the memory usage should not grow forever.
I don’t remember exactly which versions of Flink had this problem, but a few versions ago there was a bug in the version of rocksdb we were using at the time that would sometimes lead to out-of-memory errors. So if you are having problems, try upgrading to a newer version of Flink.
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田明刚
05/29/2023, 2:52 AMThanks