Mark Payne created NIFI-10051:
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Summary: When a Controller Service is removed, its state should be
cleared in a background thread
Key: NIFI-10051
URL: https://issues.apache.org/jira/browse/NIFI-10051
Project: Apache NiFi
Issue Type: Improvement
Components: Core Framework
Reporter: Mark Payne
Currently, when a Processor is removed from the canvas, the State Manager's
onComponentRemoved method is called. This is called in a synchronous/blocking
manner. By default, the timeout to communicate with ZooKeeper is 30 seconds.
There are cases when the request can time out (for instance, due to improper
Kerberos configuration), and with a 30 second timeout, this often results in
nodes getting kicked out of the cluster.
However, if the request fails, we simply log a warning and move on. As a
result, this synchronous network call should be moved to a background thread to
ensure that it does not interfere with the web request to remove the component.
This already was done in NIFI-1606 for Processors but it never got done for
Controller Services. We should do this for controller services as well.
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