Re: Changing replication factor of Cassandra cluster

2015-01-06 Thread Pranay Agarwal
Thanks Robert. Also, I have seen the node-repair operation to fail for some nodes. What are the chances of the data getting corrupt if node-repair fails? I am okay with data availability issues for some time as long as I don't loose or corrupt data. Also, is there way to restore the graph without

Re: Changing replication factor of Cassandra cluster

2015-01-06 Thread Robert Coli
On Tue, Jan 6, 2015 at 4:40 PM, Pranay Agarwal agarwalpran...@gmail.com wrote: Thanks Robert. Also, I have seen the node-repair operation to fail for some nodes. What are the chances of the data getting corrupt if node-repair fails? If repair does not complete before gc_grace_seconds, chance

Re: Changing replication factor of Cassandra cluster

2014-12-29 Thread Pranay Agarwal
Thanks Ryan. I want to understand what is the best way to increase/change the replica factor of the cassandra cluster? My priority is consistency and probably I am tolerant about some down time of the cluster. Is it totally weird to try changing replica later or are there people doing it for

Re: Changing replication factor of Cassandra cluster

2014-12-29 Thread Robert Coli
On Mon, Dec 29, 2014 at 1:40 PM, Pranay Agarwal agarwalpran...@gmail.com wrote: I want to understand what is the best way to increase/change the replica factor of the cassandra cluster? My priority is consistency and probably I am tolerant about some down time of the cluster. Is it totally

Re: Changing replication factor of Cassandra cluster

2014-12-16 Thread Ryan Svihla
Repair's performance is going to vary heavily by a large number of factors, hours for 1 node to finish is within range of what I see in the wild, again there are so many factors it's impossible to speculate on if that is good or bad for your cluster. Factors that matter include: 1. speed of

Changing replication factor of Cassandra cluster

2014-12-15 Thread Pranay Agarwal
Hi All, I have 20 nodes cassandra cluster with 500gb of data and replication factor of 1. I increased the replication factor to 3 and ran nodetool repair on each node one by one as the docs says. But it takes hours for 1 node to finish repair. Is that normal or am I doing something wrong? Also,