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Posted to commits@cassandra.apache.org by "Igor Zubchenok (JIRA)" <ji...@apache.org> on 2017/08/15 02:27:00 UTC
[jira] [Commented] (CASSANDRA-9328) WriteTimeoutException thrown
when LWT concurrency > 1, despite the query duration taking MUCH less than
cas_contention_timeout_in_ms
[ https://issues.apache.org/jira/browse/CASSANDRA-9328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126736#comment-16126736 ]
Igor Zubchenok commented on CASSANDRA-9328:
-------------------------------------------
I completely discouraged. Is there any workaround on this?
If CAS can not be actually used on non-idempotent operations, what is a real use of current LWT implementation?
> WriteTimeoutException thrown when LWT concurrency > 1, despite the query duration taking MUCH less than cas_contention_timeout_in_ms
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-9328
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9328
> Project: Cassandra
> Issue Type: Bug
> Components: Coordination
> Reporter: Aaron Whiteside
> Attachments: CassandraLWTTest2.java, CassandraLWTTest.java
>
>
> WriteTimeoutException thrown when LWT concurrency > 1, despite the query duration taking MUCH less than cas_contention_timeout_in_ms.
> Unit test attached, run against a 3 node cluster running 2.1.5.
> If you reduce the threadCount to 1, you never see a WriteTimeoutException. If the WTE is due to not being able to communicate with other nodes, why does the concurrency >1 cause inter-node communication to fail?
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