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https://issues.apache.org/jira/browse/CASSANDRA-9328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sylvain Lebresne resolved CASSANDRA-9328.
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    Resolution: Won't Fix

> 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: Core
>            Reporter: Aaron Whiteside
>            Priority: Critical
>             Fix For: 2.1.x
>
>         Attachments: CassandraLWTTest.java, CassandraLWTTest2.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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