http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live Software, Support, and Training for Apache Cassandra en-US Thu, 23 May 2013 15:52:34 +0000 http://bbpress.org/?v=1.0.3 q http://www.datastax.com/support-forums/search.php http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6711 Thu, 27 Sep 2012 17:09:27 +0000 Casa 6711@http://www.datastax.com/support-forums/ <p>I just brought down the node. That is the issue I think. I will try decommissioning.</p> <p>Thanks again </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6707 Thu, 27 Sep 2012 15:39:41 +0000 mbulman 6707@http://www.datastax.com/support-forums/ <p>How did you bring the node down? If you use decommission, it should be removed from the ring (and that decommission is what would stream the old node's data to the new node) </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6706 Thu, 27 Sep 2012 14:48:49 +0000 Casa 6706@http://www.datastax.com/support-forums/ <p>Thanks. Yes i am going to run it background.</p> <p>One last thing i want to know is, when i bring down a node from a cluster. i still see it when i do nodetool ring. how do i remove it completely ? </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6702 Thu, 27 Sep 2012 14:13:54 +0000 mbulman 6702@http://www.datastax.com/support-forums/ <p>Confirmed. If it's feasible, it would be a good idea to run repair on all of your nodes afterwards, just to make sure all data is where it's supposed to be. </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6701 Thu, 27 Sep 2012 13:32:32 +0000 Casa 6701@http://www.datastax.com/support-forums/ <p>Thanks, summing up the steps again.</p> <p>1. Install Cassandra in new node<br /> 2. Set the initial token of the new node to initial_token of the node that need to replaced - 1.<br /> 3. Start the new node. wait for bootstrap<br /> 4. Bring down the node which needs to be replaced.</p> <p>please confirm. </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6700 Thu, 27 Sep 2012 13:05:04 +0000 mbulman 6700@http://www.datastax.com/support-forums/ <p>Yes. You should not bring down the "old node" until the new node is up and running. Step 2 in your original post is the "very near to the token of the old node" part you're mentioning. Just be sure to set auto_bootstrap to true on the new node, and it will automatically stream the data it needs when it joins the ring.</p> <p>One extra thing to note is to be sure you have RF &gt; 1 on all of your keyspaces. That will ensure that if something does go wrong during the swap, you won't actually lose any data. </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6699 Thu, 27 Sep 2012 12:25:27 +0000 Casa 6699@http://www.datastax.com/support-forums/ <p>Something like doing a decommission of a node live. but i want the data to be copied only to the new node. Can i assign the token of the new node very near to the token of old node so that when old node is decommissioned, all data goes to the new node. </p> <p>Is this right way ? </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6698 Thu, 27 Sep 2012 08:03:06 +0000 Casa 6698@http://www.datastax.com/support-forums/ <p>Hi,</p> <p>If i bring down the old node before starting the replacement node, request reaching the old node will fail right ? </p> <p>i wanted to replace the node seamlessly without any down time. </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6690 Wed, 26 Sep 2012 19:43:56 +0000 mbulman 6690@http://www.datastax.com/support-forums/ <p>Yeah, apologies. Steps 1-6 still apply. You can avoid step 7 (repair) as long as auto_boostrap=true. </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6689 Wed, 26 Sep 2012 18:51:51 +0000 Casa 6689@http://www.datastax.com/support-forums/ <p>I went through the above link. But, bringing down the old node is before starting up new node. which is right for dead node replacement.</p> <p>My steps had reverse. The reason is, my node is not dead still and i do not want any request fail when i do node replacement. am i right here ? </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6677 Wed, 26 Sep 2012 14:56:18 +0000 mbulman 6677@http://www.datastax.com/support-forums/ <p>Your steps are correct. We have documentation you can follow if you'd like: <a href="http://www.datastax.com/docs/1.0/operations/cluster_management#replacing-a-dead-node" rel="nofollow">http://www.datastax.com/docs/1.0/operations/cluster_management#replacing-a-dead-node</a> </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6672 Wed, 26 Sep 2012 12:22:05 +0000 Casa 6672@http://www.datastax.com/support-forums/ <p>Any suggestions ? </p> http://www.datastax.com/support-forums/topic/replacing-a-cassandra-node-in-live#post-6635 Mon, 24 Sep 2012 08:38:19 +0000 Casa 6635@http://www.datastax.com/support-forums/ <p>I have a Cassandra Multi DC cluster (DC1:2,DC2:2). I want to replace one node in DC1 with a new node. i have to do this on live. Are these steps best way to do that ? </p> <p>1. Install Cassandra and make default settings in the new node.<br /> 2. Set the initial token of the new node to initial_token of the node that need to replaced - 1.<br /> 3. Start the new node<br /> 4. Bring down the old node.<br /> 5. Run cleanup on all the nodes </p>