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From "Igor Zubchenok (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9328) WriteTimeoutException thrown when LWT concurrency > 1, despite the query duration taking MUCH less than cas_contention_timeout_in_ms
Date Tue, 15 Aug 2017 02:27:00 GMT

    [ 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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