Mark Payne created NIFI-1606:
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Summary: When a component is removed, its state should be cleared
in a background thread
Key: NIFI-1606
URL: https://issues.apache.org/jira/browse/NIFI-1606
Project: Apache NiFi
Issue Type: Bug
Components: Core Framework
Reporter: Mark Payne
Assignee: Mark Payne
Fix For: 0.6.0
Currently, when a Processor is removed from the graph, 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.
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