[jira] [Commented] (NIFI-11289) NiFi UI blocks on read access to FlowFile Queues

["ASF subversion and git services (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-11289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17700843#comment-17700843 ] 

ASF subversion and git services commented on NIFI-11289:
--------------------------------------------------------

Commit 450a46bc588d2944544044e782ad722f898f47d0 in nifi's branch refs/heads/main from Mark Payne
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=450a46bc58 ]

NIFI-11289: Avoid obtaining read locks on queues when fetching Group Status, except in those few specific situations where it's needed.

This closes #7046

Signed-off-by: David Handermann <ex...@apache.org>


> 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
>            Priority: Major
>             Fix For: 1.latest, 2.latest
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> 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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