Re: [Cassandra] Replacing a cassandra node with one of the same IP
So are hints to a given UUID discarded after some period of time with that UUID not present in the cluster? From memory they are TTL'd at the gc_grace_seconds for the CF. Cheers - Aaron Morton Freelance Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 26/06/2013, at 5:11 AM, Robert Coli rc...@eventbrite.com wrote: On Mon, Jun 24, 2013 at 8:53 PM, aaron morton aa...@thelastpickle.com wrote: so I am just wondering if this means the hinted handoffs are also updated to reflect the new Cassandra node uuid. Without checking the code I would guess not. Because it would involve a potentially large read / write / delete to create a new row with the same data. And Hinted Handoff is an optimisation. So are hints to a given UUID discarded after some period of time with that UUID not present in the cluster? Or might they need to be manually purged? =Rob
Re: [Cassandra] Replacing a cassandra node with one of the same IP
On Mon, Jun 24, 2013 at 8:53 PM, aaron morton aa...@thelastpickle.com wrote: so I am just wondering if this means the hinted handoffs are also updated to reflect the new Cassandra node uuid. Without checking the code I would guess not. Because it would involve a potentially large read / write / delete to create a new row with the same data. And Hinted Handoff is an optimisation. So are hints to a given UUID discarded after some period of time with that UUID not present in the cluster? Or might they need to be manually purged? =Rob
Re: [Cassandra] Replacing a cassandra node with one of the same IP
so I am just wondering if this means the hinted handoffs are also updated to reflect the new Cassandra node uuid. Without checking the code I would guess not. Because it would involve a potentially large read / write / delete to create a new row with the same data. And Hinted Handoff is an optimisation. Cheers - Aaron Morton Freelance Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 22/06/2013, at 9:52 AM, Mahony, Robin robin.mah...@netapp.com wrote: Please note that I am currently using version 1.2.2 of Cassandra. Also we are using virtual nodes. My question mainly stems from the fact that the nodes appear to be aware that the node uuid changes for the IP (from reading the logs), so I am just wondering if this means the hinted handoffs are also updated to reflect the new Cassandra node uuid. If that was the case, I would not think a nodetool cleanup would be necessary. - Forwarded Message - From: Robert Coli rc...@eventbrite.com To: user@cassandra.apache.org; Emalayan Vairavanathan svemala...@yahoo.com Sent: Thursday, 20 June 2013 11:40 AM Subject: Re: [Cassandra] Replacing a cassandra node On Thu, Jun 20, 2013 at 10:40 AM, Emalayan Vairavanathan svemala...@yahoo.com wrote: In the case where replace a cassandra node (call it node A) with another one that has the exact same IP (ie. during a node failure), what exactly should we do? Currently I understand that we should at least run nodetool repair. If you lost the data from the node, then what you want is replace_token. If you didn't lose the data from the node (and can tolerate stale reads until the repair completes) you want to start the node with auto_bootstrap set to false and then repair. =Rob
Re: [Cassandra] Replacing a cassandra node with one of the same IP
Please note that I am currently using version 1.2.2 of Cassandra. Also we are using virtual nodes. My question mainly stems from the fact that the nodes appear to be aware that the node uuid changes for the IP (from reading the logs), so I am just wondering if this means the hinted handoffs are also updated to reflect the new Cassandra node uuid. If that was the case, I would not think a nodetool cleanup would be necessary. - Forwarded Message - From: Robert Coli rc...@eventbrite.commailto:rc...@eventbrite.com To: user@cassandra.apache.orgmailto:user@cassandra.apache.org; Emalayan Vairavanathan svemala...@yahoo.commailto:svemala...@yahoo.com Sent: Thursday, 20 June 2013 11:40 AM Subject: Re: [Cassandra] Replacing a cassandra node On Thu, Jun 20, 2013 at 10:40 AM, Emalayan Vairavanathan svemala...@yahoo.commailto:svemala...@yahoo.com wrote: In the case where replace a cassandra node (call it node A) with another one that has the exact same IP (ie. during a node failure), what exactly should we do? Currently I understand that we should at least run nodetool repair. If you lost the data from the node, then what you want is replace_token. If you didn't lose the data from the node (and can tolerate stale reads until the repair completes) you want to start the node with auto_bootstrap set to false and then repair. =Rob
