Hi Noble, Well I was just playing around to see if there were scenarios where different coreNodeNames could register themselves even if they weren't creating using the Collections API.
So I was doing it intentionally here to see what happens. But I can totally imagine users running into the second scenario where an old node comes back up and ends up messing up that replica in the collection accidentally. On Thu, Mar 12, 2015 at 7:01 PM, Noble Paul <noble.p...@gmail.com> wrote: > It is totally possible. > The point is , it was not a security feature and it is extremely easy to > spoof it. > The question is , was it a normal scenario or was it an effort to prove > that the system was not foolproof > > --Noble > > On Thu, Mar 12, 2015 at 6:23 PM, Varun Thacker <varunthacker1...@gmail.com > > wrote: > >> Two scenarios I observed where we can bring up a replica even when I >> think it shouldn't. legacyCloud is set to false. >> >> - I have two nodes A and B. >> - CREATE collection 'test' with 1 shard, 1 replica. It gets created >> on node A. >> - manually copy test_shard1_replica1 folder to node B's solr home. >> - Bring down node A. >> - Restart node B. The shard comes up registering itself on node B and >> becomes 'active' >> >> >> - I have two nodes A and B ( this is down currently ). >> - CREATE collection 'test' with 1 shard, 1 replica. It gets created >> on node A. >> - manually copy test_shard1_replica1 folder to node B's solr home. >> - Start node B. The shard comes up registering itself on node B and >> stays 'down'. The reason being the leader is still node A but clusterstate >> has base_url of Node B. This is the error in the logs - "Error getting >> leader from zk for shard shard1 >> >> In legacyCloud=false you get a 'no_such_replica in clusterstate' error if >> the 'coreNodeName' is not present in clusterstate. >> >> But in my two observations the 'coreNodeName' were the same, hence I ran >> into that scenario. >> >> Should we make the check more stringent to not allow this to happen? >> Check against base_url also? >> >> Also should we be making legacyCloud=false as default in 5.x? >> -- >> >> >> Regards, >> Varun Thacker >> http://www.vthacker.in/ >> > > > > -- > ----------------------------------------------------- > Noble Paul > -- Regards, Varun Thacker http://www.vthacker.in/
