RE: Replica info

[Kanwar Sangha]

Thanks ! Is there also a way to find out the replica nodes ?

Say we have 2 DCs, DC1 and DC2 with RF=2 (DC1:1, DC2:1)

Can we find out which node in DC2 is a replica ?



From: Edward Capriolo [mailto:edlinuxg...@gmail.com]
Sent: 08 May 2013 21:08
To: user@cassandra.apache.org
Subject: Re: Replica info

http://www.datastax.com/docs/1.1/references/nodetool#nodetool-getendpoints
This tells you where a key lives. (you need to hex encode the key)

On Wed, May 8, 2013 at 5:14 PM, Hiller, Dean 
dean.hil...@nrel.govmailto:dean.hil...@nrel.gov wrote:
nodetool describering {keyspace}


From: Kanwar Sangha 
kan...@mavenir.commailto:kan...@mavenir.commailto:kan...@mavenir.commailto:kan...@mavenir.com
Reply-To: 
user@cassandra.apache.orgmailto:user@cassandra.apache.orgmailto:user@cassandra.apache.orgmailto:user@cassandra.apache.org
 
user@cassandra.apache.orgmailto:user@cassandra.apache.orgmailto:user@cassandra.apache.orgmailto:user@cassandra.apache.org
Date: Wednesday, May 8, 2013 3:00 PM
To: 
user@cassandra.apache.orgmailto:user@cassandra.apache.orgmailto:user@cassandra.apache.orgmailto:user@cassandra.apache.org
 
user@cassandra.apache.orgmailto:user@cassandra.apache.orgmailto:user@cassandra.apache.orgmailto:user@cassandra.apache.org
Subject: Replica info

Is there a way in Cassandra that we can know which node has the replica for the 
data ? if we have 4 nodes and RF = 2, is there a way we can find which 2 nodes 
have the same data ?

Thanks,
Kanwar

Re: Replica info

[Michael Morris]

Not directly, but you should be able to use the output of the getendpoints
operation, and of nodetool ring to find the IP address that matches the DC
you are looking for.

Thanks,

Mike


On Thu, May 9, 2013 at 11:08 AM, Kanwar Sangha kan...@mavenir.com wrote:

  Thanks ! Is there also a way to find out the replica nodes ?

 ** **

 Say we have 2 DCs, DC1 and DC2 with RF=2 (DC1:1, DC2:1)

 ** **

 Can we find out which node in DC2 is a replica ?

 ** **

 ** **

 ** **

 *From:* Edward Capriolo [mailto:edlinuxg...@gmail.com]
 *Sent:* 08 May 2013 21:08
 *To:* user@cassandra.apache.org
 *Subject:* Re: Replica info

 ** **

 http://www.datastax.com/docs/1.1/references/nodetool#nodetool-getendpoints
 

 This tells you where a key lives. (you need to hex encode the key)

 ** **

 On Wed, May 8, 2013 at 5:14 PM, Hiller, Dean dean.hil...@nrel.gov wrote:
 

 nodetool describering {keyspace}


 From: Kanwar Sangha kan...@mavenir.commailto:kan...@mavenir.com
 Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org 
 user@cassandra.apache.orgmailto:user@cassandra.apache.org
 Date: Wednesday, May 8, 2013 3:00 PM
 To: user@cassandra.apache.orgmailto:user@cassandra.apache.org 
 user@cassandra.apache.orgmailto:user@cassandra.apache.org
 Subject: Replica info

 Is there a way in Cassandra that we can know which node has the replica
 for the data ? if we have 4 nodes and RF = 2, is there a way we can find
 which 2 nodes have the same data ?

 Thanks,
 Kanwar

 ** **

Re: Replica info

[Hiller, Dean]

nodetool describering {keyspace}


From: Kanwar Sangha kan...@mavenir.commailto:kan...@mavenir.com
Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org 
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Date: Wednesday, May 8, 2013 3:00 PM
To: user@cassandra.apache.orgmailto:user@cassandra.apache.org 
user@cassandra.apache.orgmailto:user@cassandra.apache.org
Subject: Replica info

Is there a way in Cassandra that we can know which node has the replica for the 
data ? if we have 4 nodes and RF = 2, is there a way we can find which 2 nodes 
have the same data ?

Thanks,
Kanwar

Re: Replica info

[Tyler Hobbs]

You also might be interested in nodetool getendpoints keyspace cf
key, which prints the nodes that are replicas for a given key


On Wed, May 8, 2013 at 4:14 PM, Hiller, Dean dean.hil...@nrel.gov wrote:

 nodetool describering {keyspace}


 From: Kanwar Sangha kan...@mavenir.commailto:kan...@mavenir.com
 Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org 
 user@cassandra.apache.orgmailto:user@cassandra.apache.org
 Date: Wednesday, May 8, 2013 3:00 PM
 To: user@cassandra.apache.orgmailto:user@cassandra.apache.org 
 user@cassandra.apache.orgmailto:user@cassandra.apache.org
 Subject: Replica info

 Is there a way in Cassandra that we can know which node has the replica
 for the data ? if we have 4 nodes and RF = 2, is there a way we can find
 which 2 nodes have the same data ?

 Thanks,
 Kanwar




-- 
Tyler Hobbs
DataStax http://datastax.com/

Re: Replica info

[Edward Capriolo]

http://www.datastax.com/docs/1.1/references/nodetool#nodetool-getendpoints

This tells you where a key lives. (you need to hex encode the key)


On Wed, May 8, 2013 at 5:14 PM, Hiller, Dean dean.hil...@nrel.gov wrote:

 nodetool describering {keyspace}


 From: Kanwar Sangha kan...@mavenir.commailto:kan...@mavenir.com
 Reply-To: user@cassandra.apache.orgmailto:user@cassandra.apache.org 
 user@cassandra.apache.orgmailto:user@cassandra.apache.org
 Date: Wednesday, May 8, 2013 3:00 PM
 To: user@cassandra.apache.orgmailto:user@cassandra.apache.org 
 user@cassandra.apache.orgmailto:user@cassandra.apache.org
 Subject: Replica info

 Is there a way in Cassandra that we can know which node has the replica
 for the data ? if we have 4 nodes and RF = 2, is there a way we can find
 which 2 nodes have the same data ?

 Thanks,
 Kanwar