James Z.M. Gao created FLINK-30387:
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Summary: support job singleton within TM
Key: FLINK-30387
URL: https://issues.apache.org/jira/browse/FLINK-30387
Project: Flink
Issue Type: New Feature
Components: API / Core
Reporter: James Z.M. Gao
For better managing some shared objects between slots of the same job, such as
thread pool, db connections, cache data, etc., we need the ability to create
these objects once for each job at the beginning, then to release the bounded
resource when the job finished some how with correct order. A simple static
filed cannot always archive this when the class is loaded by the TM classloader.
To implement this job level singleton, we can use the flink user classloader.
Since each flink job has its own context class loader, we could add some
methods to operate the user CL to create a user specify AutoCloseable object
only once for each job and close it at last in release hook of the user CL.
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