using NTS, you get a an error (datacenter has no more endpoints) when there are
no nodes in a DC
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Key: CASSANDRA-2456
URL: https://issues.apache.org/jira/browse/CASSANDRA-2456
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 0.7.4
Reporter: Josep M. Blanquer
If one creates a brand new DC in the NTS (NetworkTopologyStrategy) for which no
node has been seen, you'll get exceptions for any write consistency level after
that.
Note that you don't get the problem if you have a DC for which you have all
nodes marked 'down'. It seems just a bug when there are 0 nodes seen in the DC.
To reproduce:
1- Go to a running NTS cluster, and add a new DC in the strategy options. I.e.,
from the console, assuming you have DC1 and DC2 normally, add a DC3:
update keyspace WhateverKeyspace with strategy_options=[{DC1:2,DC2:1,DC3:1}];
2- Try to write...and you'll get:
java.lang.IllegalStateException: datacenter (DC3) has no more endpoints, (1)
replicas still needed
but if you boot a node in DC3, and then stop it...the writes will succeed.
I believe it should always succeed to be consistent?
Otherwise one needs to boot nodes in the right DCs, get the snitches propagated
and all...all before changing the NTS strategy options. Maybe that's fine...but
it feels inconsistent with succeeding when a whole DC is down.
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