Marcos Klein created FLINK-14300:
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Summary:
org.apache.flink.streaming.runtime.tasks.StreamTask#invoke leaks threads if
org.apache.flink.streaming.runtime.tasks.OperatorChain fails to be constructed
Key: FLINK-14300
URL: https://issues.apache.org/jira/browse/FLINK-14300
Project: Flink
Issue Type: Bug
Components: Runtime / Task
Affects Versions: 1.9.0, 1.8.2, 1.8.1
Reporter: Marcos Klein
Attachments: thread-leak-patch.diff
In the *StreamTask#invoke* method if an exception occurs during the allocation
of the
[operatorChain|[https://github.com/apache/flink/blob/release-1.9.0/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java#L370]]
class, the [exception
handling|[https://github.com/apache/flink/blob/release-1.9.0/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java#L485-L491]]
fails to cleanup the threads allocated as *StreamTask#recordWriters*. This
causes threads to leak as flink attempts to continually restart and fail for
the same cause.
An example cause is a deserialization issue on a custom operator from a
checkpoint.
Attached is a suggested fix for the master branch.
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