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From Sotirios Delimanolis <>
Subject Re: Live upgrade 2.0 to 2.1 temporarily increases GC time causing timeouts and unavailability
Date Fri, 19 Feb 2016 23:01:12 GMT
We're not all the way there yet with native. But the increased GC time is temporary, only during
the deployment. After all nodes are on 2.1, everything is smooth. 

    On Friday, February 19, 2016 1:47 PM, daemeon reiydelle <> wrote:

 FYI, my observations were with native, not thrift.


Daemeon C.M. Reiydelle
USA (+1) 415.501.0198
London (+44) (0) 20 8144 9872

On Fri, Feb 19, 2016 at 10:12 AM, Sotirios Delimanolis <> wrote:

Does your cluster contain 24+ nodes or fewer? 
We did the same upgrade on a smaller cluster of 5 nodes and we didn't see this behavior. On
the 24 node cluster, the timeouts only took effect once ~5-6-7+ nodes had been upgraded.
We're doing some more upgrades next week, trying different deployment plans. I'll report back
with the results.
Thanks for the reply (we absolutely want to move to CQL) 

    On Friday, February 19, 2016 1:10 AM, Alain RODRIGUEZ <> wrote:

 I performed this exact update a few days ago, excepted clients were using native protocol
and it wen smoothly. So I think this might be thrift related. No idea what is producing this
though, just wanted to give the info fwiw.
As a side note, unrelated to the issue, performances using native are a lot better than thrift
starting in C* 2.1. Drivers using native are also more modern allowing you to do very interesting
stuff. Updating to native now that you are using 2.1 is something you might want to do soon
enough :-).
C*heers,-----------------Alain RodriguezFrance
The Last Pickle
2016-02-19 3:07 GMT+01:00 Sotirios Delimanolis <>:

We have a Cassandra cluster with 24 nodes. These nodes were running 2.0.16. 
While the nodes are in the ring and handling queries, we perform the upgrade to 2.1.12 as
follows (more or less) one node at a time:
   - Stop the Cassandra process
   - Deploy jars, scripts, binaries, etc.
   - Start the Cassandra process

A few nodes into the upgrade, we start noticing that the majority of queries (mostly through
Thrift) time out or report unavailable. Looking at system information, Cassandra GC time goes
through the roof, which is what we assume causes the time outs.
Once all nodes are upgraded, the cluster stabilizes and no more (barely any) time outs occur. 
What could explain this? Does it have anything to do with how a 2.0 communicates with a 2.1?
Our Cassandra consumers haven't changed.


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