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From <chandrasekar....@wipro.com>
Subject Re: Cassandra Multi DC (Active-Active) Setup - Measuring latency & throughput performance
Date Sat, 27 Feb 2016 17:22:02 GMT
Thanks Bryan for the inputs. One of the tests that I'm trying to do is fire write requests
in one DC and simultaneously do read requests from other DC using cassandra-stress (custom
schema option). While reading from the other DC, I'm expecting cassandra-stress to throw some
error for no data found scenario atleast for the first few milli-seconds until the cross data
center replication is successful.


Likewise, for writes across both DC, does Cassandra have any function similar to Oracle SYSDATE/SYSTIMESTAMP
which can be used to measure the time difference of records across data centers.


Thanks & Regards, Chandra Sekar KR
________________________________
From: Bryan Cheng <bryan@blockcypher.com>
Sent: Saturday, February 27, 2016 05:01
To: user@cassandra.apache.org
Subject: Re: Cassandra Multi DC (Active-Active) Setup - Measuring latency & throughput
performance

Hi Chandra,

For write latency, etc. the tools are still largely the same set of tools you'd use for single-DC-
stuff like tracing, cfhistograms, cassandra-stress come to mind. The exact results are going
to differ based on your consistency tuning (can you get away with LOCAL_QUORUM vs QUORUM?)
and read/write patterns.

What other data are you looking to gather?

On Fri, Feb 26, 2016 at 5:53 AM, <chandrasekar.krc@wipro.com<mailto:chandrasekar.krc@wipro.com>>
wrote:

Hi,


Are there any links/resources which describe performance measurement (latency & throughput)
for a Cassandra Multi DC Active-Active setup across a WAN network (20Gbps bandwidth) with
5 nodes in each DC.


Basically, I would like to know how to measure latency of writes when data is replicated across
DC (local/remote) in active-active cluster setup


Regards, Chandra KR

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