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From <>
Subject RE: Gossip heartbeat and packet capture
Date Wed, 23 Mar 2016 14:38:43 GMT
Is this from the 1.1 line, perhaps? In my experience it could be very flappy for no particular
reason we could discover. 1.1 is a pretty dusty version. Upgrading into the 2.1 or later would
be a good idea. If you have to upgrade in place without down time, you will need to go through
many upgrades to get to the latest versions. (The late versions of 1.2 are pretty stable,

Also, you can look at the phi_convict_threshold Cassandra.yaml parameter to help with network
flakiness. Default is 8, I believe in most versions. Increasing to 10 or 12 might help.

Finally, a 2 node cluster doesn't give you many of the benefits of a distributed system. Consider
adding some nodes, if you can.

Sean Durity - Lead Cassandra Admin
Big DATA Team
For support, create a JIRA<>

From: Michael Fong []
Sent: Wednesday, March 23, 2016 4:12 AM
Subject: Gossip heartbeat and packet capture

Hi, all,

We are trying to reason the possible scenarios when a C*(v1.x) cluster connection keeps flapping
in production. (Two node cluster, each node keeps marking the other node DOWN but came back
UP within seconds; multiple times a day) We have checked the load on the cluster i- very light
and low GC activities also. We have also checked the network interface / devices were working
just fine on the nodes during the incidence. We are changing our investigation direction to
the network topology/settings, so we are thinking to capture gossip heartbeat packet to verify
if the packet is received as expected on the other end.

Has anyone tried to capture the packet of gossip internode communication? What would be the
filter / criteria to grep heartbeat-related packet only?

Thanks in advance!



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