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https://issues.apache.org/jira/browse/CASSANDRA-14847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16769535#comment-16769535
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Dinesh Joshi commented on CASSANDRA-14847:
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Thanks, [~iamaleksey]
> improvement of nodetool status -r
> ---------------------------------
>
> Key: CASSANDRA-14847
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14847
> Project: Cassandra
> Issue Type: Improvement
> Components: Tool/nodetool
> Reporter: Fumiya Yamashita
> Assignee: Fumiya Yamashita
> Priority: Major
> Fix For: 3.0.19, 3.11.5, 4.0
>
> Attachments: 3.11.1.patch
>
>
> Hello,
> When using "nodetool status -r", I found a problem that the response time
> becomes longer depending on the number of vnodes.
> In my testing environment, when the num_token is 256 and the number of nodes
> is 6, the response takes about 60 seconds.
> It turned out that the findMaxAddressLength method in status.java is causing
> the delay.
> Despite only obtaining the maximum length of the address by the number of
> vnodes, `tokenrange * vnode` times also loop processing, there is redundancy.
> To prevent duplicate host names from being referenced every time, I modified
> to check with hash.
> In my environment, the response time has been reduced from 60 seconds to 2
> seconds.
> I attached the patch, so please check it.
> Thank you
> {code:java}
> [before]
> Datacenter: dc1
> ===============
> Status=Up/Down
> |/ State=Normal/Leaving/Joining/Moving
> -- Address Load Tokens Owns (effective) Host ID Rack
> UN ******* 559.32 KB 256 48.7% 0555746a-60c2-4717-b042-94ba951ef679 *******
> UN ******* 721.48 KB 256 51.4% 1af4acb6-e0a0-4bcb-8bba-76ae2e225cd5 *******
> UN ******* 699.98 KB 256 48.3% 5215c728-9b80-4e3c-b46b-c5b8e5eb753f *******
> UN ******* 691.65 KB 256 48.1% 57da4edf-4acb-474d-b26c-27f048c37bd6 *******
> UN ******* 705.66 KB 256 52.8% 07520eab-47d2-4f5d-aeeb-f6e599c9b084 *******
> UN ******* 610.87 KB 256 50.7% 6b39acaf-6ed6-42e4-a357-0d258bdf87b7 *******
> time : 66s
> [after]
> Datacenter: dc1
> ===============
> Status=Up/Down
> |/ State=Normal/Leaving/Joining/Moving
> -- Address Load Tokens Owns (effective) Host ID Rack
> UN ******* 559.32 KB 256 48.7% 0555746a-60c2-4717-b042-94ba951ef679 *******
> UN ******* 721.48 KB 256 51.4% 1af4acb6-e0a0-4bcb-8bba-76ae2e225cd5 *******
> UN ******* 699.98 KB 256 48.3% 5215c728-9b80-4e3c-b46b-c5b8e5eb753f *******
> UN ******* 691.65 KB 256 48.1% 57da4edf-4acb-474d-b26c-27f048c37bd6 *******
> UN ******* 705.66 KB 256 52.8% 07520eab-47d2-4f5d-aeeb-f6e599c9b084 *******
> UN ******* 610.87 KB 256 50.7% 6b39acaf-6ed6-42e4-a357-0d258bdf87b7 *******
> time : 2s
> {code}
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