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From Robert Wille <rwi...@fold3.com>
Subject Re: Recommissioned node is much smaller
Date Tue, 02 Dec 2014 21:06:27 GMT
I meant to mention that I had run repair, but neglected to do so. Sorry about that. Repair
runs pretty quick (a fraction of the time that compaction takes) and doesn’t seem to do
anything.

On Dec 2, 2014, at 1:44 PM, Robert Coli <rcoli@eventbrite.com<mailto:rcoli@eventbrite.com>>
wrote:

On Tue, Dec 2, 2014 at 12:21 PM, Robert Wille <rwille@fold3.com<mailto:rwille@fold3.com>>
wrote:
As a a test, I took down a node, deleted /var/lib/cassandra and restarted it. After it joined
the cluster, it’s about 75% the size of its neighbors (both in terms of bytes and numbers
of keys). Prior to my test it was approximately the same size. I have no explanation for why
that node would shrink so much, other than data loss. I have no deleted data, and no TTL’s.
Only a small percentage of my data has had any updates (and some of my tables have had only
inserts, and those have shrunk by 25% as well). I don’t really know how to check if I have
records that have fewer than three replicas (RF=3).

Sounds suspicious, actually. I would suspect "partial-bootstrap."

To determine if you have under-replicated data, run repair. That's what it's for.

=Rob



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