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From George Sigletos <>
Subject Re: Running sstableloader from every node when migrating?
Date Tue, 01 Dec 2015 15:20:23 GMT
Thank you Robert and Anuja,

It does not seem that sstable2json is the right tool to go: there is no
documentation beyond Cassandra 1.2, it requires a specific sstable to be
given, which means a lot of manual work.

The documentation also mentions it is good for testing/debugging but I
would need to migrate near 1 TB of data from a 6-node cluster to a 3-node
one. Neither copying sstables/nodetool refresh seems a great option as
well. Unless I am missing something.

Using sstableloader seems a more logical option. Still a bottleneck if you
need to do it for every node in your source cluster. What if you had a
100-node cluster?

Thinking of just running a simple script, instead, that selects data from
the source cluster and inserts them to the target one.

Kind regards,

On Tue, Dec 1, 2015 at 7:54 AM, anuja jain <> wrote:

> Hello George,
> You can use sstable2json to create the json of your keyspace and then load
> this json to your keyspace in new cluster using json2sstable utility.
> On Tue, Dec 1, 2015 at 3:06 AM, Robert Coli <> wrote:
>> On Thu, Nov 19, 2015 at 7:01 AM, George Sigletos <>
>> wrote:
>>> We would like to migrate one keyspace from a 6-node cluster to a 3-node
>>> one.
>> =Rob

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