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https://issues.apache.org/jira/browse/FLINK-12486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16838372#comment-16838372
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aitozi commented on FLINK-12486:
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I can do this a favour to complete the explanation.
> RocksDB State Backend docs don't explain that operator state is kept on heap
> ----------------------------------------------------------------------------
>
> Key: FLINK-12486
> URL: https://issues.apache.org/jira/browse/FLINK-12486
> Project: Flink
> Issue Type: Improvement
> Components: Documentation, Runtime / State Backends
> Affects Versions: 1.7.2, 1.8.0, 1.9.0
> Reporter: Fabian Hueske
> Priority: Minor
>
> The documentation of the [RocksDB State
> Backend|https://ci.apache.org/projects/flink/flink-docs-release-1.8/ops/state/state_backends.html#the-rocksdbstatebackend]
> does not explain that operator state is maintained on the JVM heap and not
> in RocksDB (on disk).
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