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Subject: Re: nodetool repair with vnodes
From: Marco Matarazzo <marco.matarazzo@hexkeep.com>
In-Reply-To: <40ED42F4-50A1-4391-B815-6AD2680FF042@thelastpickle.com>
Date: Sun, 17 Feb 2013 23:12:16 +0100
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 <40ED42F4-50A1-4391-B815-6AD2680FF042@thelastpickle.com>
To: user@cassandra.apache.org

>> So, to me, it's like the "nodetool repair" command is running always =
on the same single node and repairing everything.
> If you use nodetool repair without the -pr flag in your setup (3 nodes =
and I assume RF 3) it will repair all token ranges in the cluster.=20

That's correct, 3 nodes and RF 3. Sorry for not specifying it in the =
beginning.


So, running it periodically on just one node is enough for cluster =
maintenance ? Does this depends on the fact that every vnode data is =
related with the previous and next vnode, and this particular setup =
makes this enough as it cover every physical node?


Also: running it with -pr does output:

[2013-02-17 12:29:25,293] Nothing to repair for keyspace 'system'
[2013-02-17 12:29:25,301] Starting repair command #2, repairing 1 ranges =
for keyspace keyspace_test
[2013-02-17 12:29:28,028] Repair session =
487d0650-78f5-11e2-a73a-2f5b109ee83c for range =
(-9177680845984855691,-9171525326632276709] finished
[2013-02-17 12:29:28,028] Repair command #2 finished

=85 that, as far as I can understand, works on the first vnode on the =
specified node, or so it seems from the output range. Am I right? Is =
there a way to run it only for all vnodes on a single physical node ?

Thank you!

--
Marco Matarazzo