There are 2 options for that situation when riak-admin cluster plan gives
you the Not all replicas will be on distinct nodes warning.
1. You can riak-admin cluster clear, which will wipe out the plan, and the
riak-admin cluster plan again. You will get the same effect of
redistributing the vnodes without needing to join/leave.
2. Or you could change the claim algorithm. Set {choose_claim_fun,
{riak_core_claim,choose_claim_v3}} and
{wants_claim_fun,{riak_core_claim,wants_claim_v3}} in the riak_core section
of app.config on each node and restart. Then clear and plan again, the new
plan will use the version 3 claim functions.
Joe
From: Guillermo <[email protected]>
Date: Wednesday, August 7, 2013 5:17 AM
To: <[email protected]>
Subject: WARNING: Not all replicas will be on distinct nodes (with 5 nodes)
Hi. I saw before this warning with clusters with not enough nodes.
On this case, the environment is amazon ec2 c1.xlarge machines in the same
availability zone. 5 machines. Manage with chef and the oficial riak
cookbook 2.2.0 that installs riak 1.4.0 build 1.
The process:
>
> knife ssh "roles:riak" "riak-admin cluster join riak@node01"
> ssh node01 riak-admin cluster plan
> ssh node01 riak-admin cluster commit
In the plan face, it already says:
>
> WARNING: Not all replicas will be on distinct nodes
And after commit, riak-admin diag confirms that:
> [warning] The following preflists do not satisfy the n_val: [[{0,
> 'riak@node02'},
>
> {2854495385411919762116571938898990272765493248,
> 'riak@node02'},
>
> {5708990770823839524233143877797980545530986496,
> [....] (with
> metions to all the nodes)
>
The solution I found was:
In node01 (or probably any). riak-admin cluster leave. Wait till transfers
finish, and join again.
After this tedious process (30 minuts every cluster commit), riak-diag no
longer mentions nothing.
I do this process to times, with the same result, and needing to apply the
same solution.
Any way to skip this? I am doing something wrong?
Thanks.
--
Guillermo Álvarez
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