[jira] [Commented] (CASSANDRA-6772) Cassandra inter data center communication broken

["Ananthkumar K S (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-6772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13999743#comment-13999743 ] 

Ananthkumar K S commented on CASSANDRA-6772:
--------------------------------------------

[~cnlwsu]

Thread dump for the this problem. Now this occurs within the same datacenter.

https://www.dropbox.com/s/67kyh7em21jymqa/cassandra-threaddump.zip


> Cassandra inter data center communication broken
> ------------------------------------------------
>
>                 Key: CASSANDRA-6772
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6772
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: CentOS 6.0
>            Reporter: Ananthkumar K S
>            Priority: Blocker
>
> I have two data enters DC1 and DC2. Both communicate via a private link. Yesterday, we had a problem with a private link for 10 mins. From the time the problem was resolved, nodes in both data centers are not able to communicate with each other. When I do a nodetool status on a node in DC1, the nodes in DC2 are stated as down. When tried in DC2, nodes in DC1 are shown as down .
> But in the cassandra logs, we can clearly see that handshaking is failing every 5 seconds for communication between data centres. At TCP level, there are too many fin_wait1 generated by cassandra which is still a puzzle . Closed_wait top transitions due to this is very high. Due to this kind of problem of TCP listen drops, we moved from 2.0.1 to 2.0.3. In 2.0.1, it was within data center itself. But here it's between data centers. If it has anything to do with the snitch configuration, I am using GossipingPropertyFileSnitch.
> This clearly started happening post private link failure. Any idea on this?
> Cassandra version used is 2.0.3



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