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https://issues.apache.org/jira/browse/FLINK-15043?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jordan Hatcher closed FLINK-15043.
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Resolution: Invalid
> 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
> Priority: Major
>
> 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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