> I wrote a small (yet untested) utility, which should be able to read SSTable > files from disk and write them into a cassandra cluster using Hector. Consider using the SSTableSimpleUnsortedWriter (see http://www.datastax.com/dev/blog/bulk-loading) to create the SSTables you can then bulk load them into the destination system.This will be much faster.
Cheers ----------------- Aaron Morton New Zealand @aaronmorton Co-Founder & Principal Consultant Apache Cassandra Consulting http://www.thelastpickle.com On 29/12/2013, at 6:26 am, Edward Capriolo <edlinuxg...@gmail.com> wrote: > Internally we have a tool that does get range slice on the souce cluster and > replicates to destination. > > Remeber that writes are itempotemt. Our tool can optionally only replicate > data between two timestamps, allowing incremental transfers. > > So if you get your application writing new data to both clusters you can run > a range scanning program to copy all the data. > > On Monday, December 23, 2013, horschi <hors...@gmail.com> wrote: > > Interesting you even dare to do a live migration :-) > > > > Do you do all Murmur-writes with the timestamp from the "Random"-data? So > > that all migrated data is written with timestamps from the past. > > > > > > > > On Mon, Dec 23, 2013 at 3:59 PM, Rahul Menon <ra...@apigee.com> wrote: > >> > >> Christian, > >> > >> I have been planning to migrate my cluster from random to murmur3 in a > >> similar manner. I intend to use pycassa to read and then write to the > >> newer cluster. My only concern would be ensuring the consistency of > >> already migrated data as the cluster ( with random ) would be constantly > >> serving the production traffic. I was able to do this on a non prod > >> cluster, but production is a different game. > >> > >> I would also like to hear more about this, especially if someone was able > >> to successfully do this. > >> > >> Thanks > >> Rahul > >> > >> > >> On Mon, Dec 23, 2013 at 6:45 PM, horschi <hors...@gmail.com> wrote: > >>> > >>> Hi list, > >>> > >>> has anyone ever tried to migrate a cluster from Random to Murmur? > >>> > >>> We would like to do so, to have a more standardized setup. I wrote a > >>> small (yet untested) utility, which should be able to read SSTable files > >>> from disk and write them into a cassandra cluster using Hector. This > >>> migration would be offline of course and would only work for smaller > >>> clusters. > >>> > >>> Any thoughts on the topic? > >>> > >>> kind regards, > >>> Christian > >>> > >>> PS: The reason for doing so are not "performance". It is to simplify > >>> operational stuff for the years to come. :-) > >> > > > > > > -- > Sorry this was sent from mobile. Will do less grammar and spell check than > usual.
