Mark Payne created NIFI-11289:
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Summary: NiFi UI blocks on read access to FlowFile Queues
Key: NIFI-11289
URL: https://issues.apache.org/jira/browse/NIFI-11289
Project: Apache NiFi
Issue Type: Bug
Components: Core Framework
Reporter: Mark Payne
Assignee: Mark Payne
When the NiFi UI makes a request for a given Process Group or its status, the
backend must obtain Read Locks on the FlowFile Queues in order to provide the
information back to the UI.
This results in a sluggish UI whenever there are a lot of queues with a lot of
FlowFiles flowing. And in a case where we drop huge numbers of FlowFiles or add
huge numbers of FlowFiles to queue (for instance, as a result of SplitJson)
that lock can be held for quite a while, making the UI block arbitrarily long.
The Read Locks, however, are not necessary for any of the requests that the UI
makes for the canvas. They are necessary only for the Status History of the
Connection/Queue. And for backward compatibility we should also make it
available to Reporting Tasks.
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