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From Kévin LOVATO (JIRA) <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-5550) nodetool repair hanging on multi sites config
Date Wed, 08 May 2013 13:19:16 GMT
Kévin LOVATO created CASSANDRA-5550:
---------------------------------------

             Summary: nodetool repair hanging on multi sites config
                 Key: CASSANDRA-5550
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5550
             Project: Cassandra
          Issue Type: Bug
          Components: Tools
    Affects Versions: 1.2.4
            Reporter: Kévin LOVATO


We recently added a new datacenter to our cluster, and we want some keyspaces to be replicated
to it, but not all.
So some of our Keyspaces have a replication factor of {code}{ dcMain: 3, dcNew: 1 }{code}and
some have {code}{ dcMain: 3 }{code}We then ran a nodetool repair on one of the new servers
so the data would be replicated correctly, but it just hung.
After some investigation, we saw that if a Keyspace didn't have replication info for dcNew,
or a replication factor of 0, a nodetool repair from the new servers would hang (nothing concerning
repair in the logs, not even in DEBUG level).
On the other hand, it works properly if the Keyspace has a replica in dcNew or if the repair
is called from dcMain.
We might be doing something wrong, but I don't think nodetool should hang silently even if
something is going wrong.

Nodetool repair -pr also works in all situations, but it seems that it is not copying the
data to the new datacenter at all, it runs and logs that the keyspace is up to date after
receiving the merkle trees, even though nothing is actually copied on the disk, even after
flushing (maybe an unrelated issue, should I open another ticket?).

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