Fumiya Yamashita created CASSANDRA-14847:
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Summary: improvement of nodetool status -r
Key: CASSANDRA-14847
URL: https://issues.apache.org/jira/browse/CASSANDRA-14847
Project: Cassandra
Issue Type: Improvement
Reporter: Fumiya Yamashita
Fix For: 3.11.x
Attachments: 3.11.1.patch
Hello,
When using "nodetool -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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