CODEWITHSUNDEEP
cassandradatastax-java-driverphantom-dsl
omer
omer

Reputation: 1440

How to check from/to which Cassandra node the client read/write data?

I'm working with Cassandra 3.x and Phantom driver (scala), and modifying my Cassandra deployment from a simple, three nodes cluster to a multi datacenter Cassandra deployment that consists of two datacenters:

Transactional - the "main" datacenter, to which all reads/writes occur (except for reads/writes done by some analytics job).

Analytics - a datacenter used for analytics purposes only. The analytics job should operate (i.e. read/write to) on this datacenter.

I configured the client on the analytics job to read/write to the analytics data-center, and all other services to read/write from the transactional data-center.

How can I check the client actually behaves as expected - and reads/writes the data to the correct data-center?

Upvotes: 2

Views: 395

Answers (1)

Aaron
Aaron

Reputation: 57748

The driver has an option allowing you to turn on tracking. That should allow you to see which nodes are involved with each query.

There's a short description of how to do this on the driver documentation page: https://docs.datastax.com/en/developer/java-driver/4.2/manual/core/logging/

The query logger reference API has a lot more detail on the available methods, and can even show the values of bind vars, if needed.

Upvotes: 1

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