Shammon created FLINK-29637:
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Summary: Improve to reuse threads in TaskManager for different
tasks between jobs
Key: FLINK-29637
URL: https://issues.apache.org/jira/browse/FLINK-29637
Project: Flink
Issue Type: Sub-task
Components: Runtime / Task
Affects Versions: 1.17.0
Reporter: Shammon
Currently `TaskManager` will create multiple threads for each task, such as
execution thread, cancel thread, source thread, flush thread and etc. These
threads will be destroyed when the task is finished. In olap cluster, the
`TaskManager` frequently creates and destroys threads, which causes a great
waste of resources. We should improve the `TaskManager` to reuse these thread
after the task is finished.
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