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Posted to commits@cassandra.apache.org by "Paulo Motta (Jira)" <ji...@apache.org> on 2022/07/18 21:21:00 UTC
[jira] [Updated] (CASSANDRA-11170) Uneven load can be created by cross DC mutation propagations, as remote forwarding node is not randomly picked
[ https://issues.apache.org/jira/browse/CASSANDRA-11170?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Paulo Motta updated CASSANDRA-11170:
------------------------------------
Resolution: Fixed
Status: Resolved (was: Open)
Closing as fixed by CASSANDRA-15318
> Uneven load can be created by cross DC mutation propagations, as remote forwarding node is not randomly picked
> --------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-11170
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11170
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/Coordination
> Reporter: Wei Deng
> Assignee: Wei Deng
> Priority: Normal
> Attachments: 11170.patch
>
>
> I was looking at the o.a.c.service.StorageProxy code and realized that it seems to be always picking the first IP in the remote DC target list as the destination, whenever it needs to send the mutation to a remote DC. See these lines in the code:
> https://github.com/apache/cassandra/blob/1944bf507d66b5c103c136319caeb4a9e3767a69/src/java/org/apache/cassandra/service/StorageProxy.java#L1280-L1301
> This could cause one node in the remote DC receiving more mutation messages than the other nodes, and hence uneven workload distribution.
> A trivial test (with TRACE logging level enabled) on a 3+3 node cluster proved the problem, see the system.log entries below:
> {code}
> INFO [RMI TCP Connection(18)-54.173.227.52] 2016-02-13 09:54:55,948 StorageService.java:3353 - set log level to TRACE for classes under 'org.apache.cassandra.service.StorageProxy' (if the level doesn't look like 'TRACE' then the logger couldn't parse 'TRACE')
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:15,148 StorageProxy.java:1284 - Adding FWD message to 8996@/52.53.215.74
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:15,149 StorageProxy.java:1284 - Adding FWD message to 8997@/54.183.23.201
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:15,149 StorageProxy.java:1289 - Sending message to 8998@/54.183.209.219
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:22,939 StorageProxy.java:1284 - Adding FWD message to 9032@/52.53.215.74
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:22,940 StorageProxy.java:1284 - Adding FWD message to 9033@/54.183.23.201
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:22,941 StorageProxy.java:1289 - Sending message to 9034@/54.183.209.219
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:28,975 StorageProxy.java:1284 - Adding FWD message to 9064@/52.53.215.74
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:28,976 StorageProxy.java:1284 - Adding FWD message to 9065@/54.183.23.201
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:28,977 StorageProxy.java:1289 - Sending message to 9066@/54.183.209.219
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:33,464 StorageProxy.java:1284 - Adding FWD message to 9094@/52.53.215.74
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:33,465 StorageProxy.java:1284 - Adding FWD message to 9095@/54.183.23.201
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:33,478 StorageProxy.java:1289 - Sending message to 9096@/54.183.209.219
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:39,243 StorageProxy.java:1284 - Adding FWD message to 9121@/52.53.215.74
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:39,244 StorageProxy.java:1284 - Adding FWD message to 9122@/54.183.23.201
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:39,244 StorageProxy.java:1289 - Sending message to 9123@/54.183.209.219
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:44,248 StorageProxy.java:1284 - Adding FWD message to 9145@/52.53.215.74
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:44,249 StorageProxy.java:1284 - Adding FWD message to 9146@/54.183.23.201
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:44,249 StorageProxy.java:1289 - Sending message to 9147@/54.183.209.219
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:49,731 StorageProxy.java:1284 - Adding FWD message to 9170@/52.53.215.74
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:49,734 StorageProxy.java:1284 - Adding FWD message to 9171@/54.183.23.201
> TRACE [SharedPool-Worker-1] 2016-02-13 09:55:49,735 StorageProxy.java:1289 - Sending message to 9172@/54.183.209.219
> INFO [RMI TCP Connection(22)-54.173.227.52] 2016-02-13 09:56:19,545 StorageService.java:3353 - set log level to INFO for classes under 'org.apache.cassandra.service.StorageProxy' (if the level doesn't look like 'INFO' then the logger couldn't parse 'INFO')
> {code}
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