Jordan Hatcher created FLINK-15043:
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Summary: Possible thread leak in task manager
Key: FLINK-15043
URL: https://issues.apache.org/jira/browse/FLINK-15043
Project: Flink
Issue Type: Bug
Components: Runtime / Task
Affects Versions: 1.8.2
Reporter: Jordan Hatcher
We have a few flink clusters running version 1.8.2, with a mongo 4.2 database.
We initially noticed a large number (16000-19000) of connections to the
database, which we traced back to the flink task manager. Restarting the task
managers dropped this number down to a few hundred connections. The number of
database connections roughly corresponds to the number of task manager threads
as reported by the metrics API
(/taskmanagers/metrics?get=Status.JVM.Threads.Count) across a few different
clusters, so we suspect there is some kind of thread leak occurring in the task
manager. Running a few jobs through our flink workflow shows that the number of
database connections is increasing by about 50 for each job we run.
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