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From "James Howe (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-9328) WriteTimeoutException thrown when LWT concurrency > 1, despite the query duration taking MUCH less than cas_contention_timeout_in_ms
Date Fri, 15 Jan 2016 12:47:39 GMT

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James Howe edited comment on CASSANDRA-9328 at 1/15/16 12:46 PM:
-----------------------------------------------------------------

Am I understanding this correctly? If a SERIAL write throws a WriteTimeoutException, I must
then perform a SERIAL read to find out whether it actually succeeded or not? Or is not that
even guaranteed to work?


was (Author: jameshowe):
Am I understanding this correctly? If a SERIAL write throws a WriteTimeoutException, I must
then perform a SERIAL read to find out whether it actually succeeded or not?

> 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
>             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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