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From kurt greaves <>
Subject Re: Suggestions for migrating data from cassandra
Date Tue, 15 May 2018 18:04:14 GMT
COPY might work but over hundreds of gigabytes you'll probably run into
issues if you're overloaded. If you've got access to Spark that would be an
efficient way to pull down an entire table and dump it out using the

On 15 May 2018 at 10:59, Jing Meng <> wrote:

> Hi guys, for some historical reason, our cassandra cluster is currently
> overloaded and operating on that somehow becomes a nightmare. Anyway,
> (sadly) we're planning to migrate cassandra data back to mysql...
> So we're not quite clear how to migrating the historical data from
> cassandra.
> While as I know there is the COPY command, I wonder if it works in product
> env where more than hundreds gigabytes data are present. And, if it does,
> would it impact server performance significantly?
> Apart from that, I know spark-connector can be used to scan data from c*
> cluster, but I'm not that familiar with spark and still not sure whether
> write data to mysql database can be done naturally with spark-connector.
> Are there any suggestions/best-practice/read-materials doing this?
> Thanks!

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