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From "Chris Lohfink (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-6772) Cassandra inter data center communication broken
Date Wed, 26 Feb 2014 16:01:21 GMT


Chris Lohfink commented on CASSANDRA-6772:

I would check the firewall and accessibility between the servers.  From one of the DC1 servers
see if you can create a tcp connection to port 7000 with telnet or netcat to one of the DC2
servers using the same IP DC1 servers would try to use.

Is there different IPs they should be using locally vs the other DC?  With GPFS you can set
the broadcast address to the external IP and listen_address to local IP and it should handle

> Cassandra inter data center communication broken
> ------------------------------------------------
>                 Key: CASSANDRA-6772
>                 URL:
>             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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