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From "sankalp kohli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10423) Paxos/LWT failures when moving node
Date Thu, 17 Dec 2015 00:09:46 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15061181#comment-15061181
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sankalp kohli commented on CASSANDRA-10423:
-------------------------------------------

[~slebresne] Why will there be more contention when there are more participants? Contention
depends upon if you have more clients which are updating the same CQL partitions. I don't
see how this should be affected. 


> Paxos/LWT failures when moving node
> -----------------------------------
>
>                 Key: CASSANDRA-10423
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10423
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Cassandra version: 2.0.14
> Java-driver version: 2.0.11
>            Reporter: Roger Schildmeijer
>             Fix For: 2.1.x
>
>
> While moving a node (nodetool move <newtoken>) we noticed that lwt started failing
for some (~50%) requests. The java-driver (version 2.0.11) returned com.datastax.driver.core.exceptions.WriteTimeoutException:
Cassandra timeout during write query at consistency SERIAL (7 replica were required but only
0 acknowledged the write). The cluster was not under heavy load.
> I noticed that the failed lwt requests all took just above 1s. That information and the
WriteTimeoutException could indicate that this happens:
> https://github.com/apache/cassandra/blob/cassandra-2.0.14/src/java/org/apache/cassandra/service/StorageProxy.java#L268
> I can't explain why though. Why would there be more cas contention just because a node
is moving?



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