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Valuser avatar image
Valuser asked Erick Ramirez answered

Do I need to run sstableloader in each of the target nodes?

Hi, I have a 3 node cluster . I took a backup snapshot from each of these 3 nodes. I want to restore the above snapshot to a 2 node (n1, n2) target cluster.

I am currenlty logged in to one of the target cluster nodes (n1). I am running sstableloader from this instance to restore the above said 3 node cluster snapshot folder.

Is it enough to run sstableloader in one of the target cluster nodes?(here n1). I mean will sstableloader understand the other node(n2) also belong in the target cluster ring and distribute accordingly.

Or do i need to run sstableloader in each of the target cluster nodes?

sstableloader
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Erick Ramirez answered

As I explained in your other question, the Cassandra bulk loader utility sstableloader loads table snapshots to a cluster by streaming relevant parts of SSTables to destination nodes. In this context, "relevant parts" means the data which belongs in the token range(s) owned by the destination nodes.

This means that any data you restore is streamed to the relevant token range owners in the cluster.

For what it's worth, you just happen to be running the sstableloader utility on "node 1". You can run multiple instances of the utility on other servers which are not part of the cluster for optimum performance. Cheers!

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