Francis created FLINK-39900:
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Summary: Support configuring the number of threads used in
ForStStateDataTransfer
Key: FLINK-39900
URL: https://issues.apache.org/jira/browse/FLINK-39900
Project: Flink
Issue Type: Improvement
Components: Runtime / State Backends
Reporter: Francis
Currently it is not possible to configure the thread pool used in the
`ForStStateDataTransfer` class. This limits the amount of threads available
when transferring or writing state using ForSt. Whenever a
`ForStStateDataTransfer` class is created, the default `DEFAULT_THREAD_NUM` of
4 is passed in via the class constructor.
When working with Flink applications that handle large amounts of state it
would be helpful to tune this value. We should add a `ConfigOption` that allows
configuring the amount of threads made available to the
`ForStStateDataTransfer` class.
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