[replication] Add a check to make sure we don't replicate to ourselves
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Key: HBASE-4654
URL: https://issues.apache.org/jira/browse/HBASE-4654
Project: HBase
Issue Type: Improvement
Affects Versions: 0.90.4
Reporter: Jean-Daniel Cryans
Fix For: 0.90.5
It's currently possible to add a peer for replication and point it to the local
cluster, which I believe could very well happen for those like us that use only
one ZK ensemble per DC so that only the root znode changes when you want to set
up replication intra-DC.
I don't think comparing just the cluster ID would be enough because you would
normally use a different one for another cluster and nothing will block you
from pointing elsewhere.
Comparing the ZK ensemble address doesn't work either when you have multiple
DNS entries that point at the same place.
I think this could be resolved by looking up the master address in the relevant
znode as it should be exactly the same thing in the case where you have the
same cluster.
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