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From "ZhaoYang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13562) nodes in cluster gets into split-brain mode
Date Wed, 05 Jul 2017 00:32:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16074128#comment-16074128
] 

ZhaoYang commented on CASSANDRA-13562:
--------------------------------------

you may consider checking `phi_convict_threshold` in cassandra.yaml and turning the logging
for phi value in gossip. then you will get a better idea why c* node thinks another as down
node.

> nodes in cluster gets into split-brain mode
> -------------------------------------------
>
>                 Key: CASSANDRA-13562
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13562
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jaydeepkumar Chovatia
>             Fix For: 3.0.x
>
>
> We have seen nodes in Cassandra (3.0.11) ring gets into split-brain somehow. We don't
know exact reproducible steps but here is our observation:
> Let's assume we have 5 node cluster n1,n2,n3,n4,n5. In this bug when do nodetool status
on each node then each one has different view of DN node
> e.g.
> n1 sees n3 as DN and other nodes are UN
> n3 sees n4 as DN and other nodes are UN
> n4 sees n5 as DN and other nodes are UN and so on...
> One thing we have observed is once n/w link is broken and restored then sometimes nodes
go into this split-brain mode but we still don't have exact reproducible steps.
> Please let us know if I am missing anything specific here.



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