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From Romain HARDOUIN <>
Subject RE: Cassandra-shuffle fails
Date Fri, 30 Aug 2013 12:34:38 GMT

"Failed to enable shuffling" is thrown when an IOException occurs in the 
constructor JMXConnection(endpoint, port).
See Shuffle.enableRelocations() in

Have you set up credentials for JMX?


De :    Tamar Rosen <>
A :, 
Cc :    Vitaly Sourikov <>, Yair Pinyan 
Date :  29/08/2013 17:35
Objet : Cassandra-shuffle fails


We recently upgraded from version 1.1 to 1.2
It all went well, including setting up vnodes, but shuffle fails. 

We have 2 nodes, hosted on Amazon AWS

The steps we took (on each of our nodes) are pretty straight forward:
1. upgrade binaries
2. adjust cassandra.yaml (keep token)
3. nodetool upgradesstables
4. change cassandra.yaml to vnodes rather than tokens
5. restart cassandra
6. cassandra-shuffle create. 

All the above went fine. However, the following fails:
cassandra-shuffle enable
Failed to enable shuffling on!

1. The failure is immediate, and consistent.  
2. Calling shuffle create on either node prepares the shuffle files for 
3. I made sure both servers are communicating fine on both 9160 and 7199.

Any help will be greatly appreciated.


Tamar Rosen
Senior Data Architect


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