Re: configuring read write quorums in cassandra
Thanks! Muntasir. On Wed, Aug 28, 2013 at 3:52 PM, Robert Coli wrote: > On Wed, Aug 28, 2013 at 1:48 PM, Muntasir Raihan Rahman > wrote: >> >> Let us say I set read consistency level = ONE, and I am running the >> system for a while. Then I want to change the read consistency level >> to TWO so that reads now wait to hear back from 2 replicas instead of >> 1 before responding to the client. > > > In general, TWO is only for users who really know what they are doing. Most > users will use ONE or *_QUORUM. > > But changing it is just a matter of changing the ConsistencyLevel of your > new requests, in your application code. > > Changing *replication factor* is a bit more involved. > > =Rob > -- Best Regards Muntasir Raihan Rahman Email: muntasir.rai...@gmail.com Department of Computer Science, University of Illinois Urbana Champaign, 3111 Siebel Center, 201 N. Goodwin Avenue, Urbana, IL 61801
Re: configuring read write quorums in cassandra
Thanks for clarifying that! Muntasir. On Wed, Aug 28, 2013 at 3:51 PM, Andrey Ilinykh wrote: > Each query has its own consistency level. It has nothing to do with > cassandra. > > > On Wed, Aug 28, 2013 at 1:48 PM, Muntasir Raihan Rahman > wrote: >> >> Sorry, let me clarify. >> >> Let us say I set read consistency level = ONE, and I am running the >> system for a while. Then I want to change the read consistency level >> to TWO so that reads now wait to hear back from 2 replicas instead of >> 1 before responding to the client. I want to change this consistency >> level, and then continue running the system. >> >> Does that clarify my query? >> >> Thanks >> Muntasir. >> >> On Wed, Aug 28, 2013 at 3:39 PM, Andrey Ilinykh >> wrote: >> > What do you mean "to change the cassandra read and write quorums"? >> > Quorum is >> > quorum, 2 of 3 for example. What do you want to change? >> > >> > Andrey >> > >> > >> > On Wed, Aug 28, 2013 at 1:33 PM, Muntasir Raihan Rahman >> > wrote: >> >> >> >> Hello, >> >> >> >> Are there any tools (e.g like nodetool) that could be used to change >> >> the cassandra read and write quorums at run-time? >> >> >> >> In general what is a good strategy of changing these system parameters >> >> while cassandra is running? >> >> >> >> Any pointers could be useful! >> >> >> >> Thanks >> >> Muntasir. >> > >> > >> >> >> >> -- >> Best Regards >> Muntasir Raihan Rahman >> Email: muntasir.rai...@gmail.com >> Department of Computer Science, >> University of Illinois Urbana Champaign, >> 3111 Siebel Center, >> 201 N. Goodwin Avenue, >> Urbana, IL 61801 > > -- Best Regards Muntasir Raihan Rahman Email: muntasir.rai...@gmail.com Department of Computer Science, University of Illinois Urbana Champaign, 3111 Siebel Center, 201 N. Goodwin Avenue, Urbana, IL 61801
Re: configuring read write quorums in cassandra
Sorry, let me clarify. Let us say I set read consistency level = ONE, and I am running the system for a while. Then I want to change the read consistency level to TWO so that reads now wait to hear back from 2 replicas instead of 1 before responding to the client. I want to change this consistency level, and then continue running the system. Does that clarify my query? Thanks Muntasir. On Wed, Aug 28, 2013 at 3:39 PM, Andrey Ilinykh wrote: > What do you mean "to change the cassandra read and write quorums"? Quorum is > quorum, 2 of 3 for example. What do you want to change? > > Andrey > > > On Wed, Aug 28, 2013 at 1:33 PM, Muntasir Raihan Rahman > wrote: >> >> Hello, >> >> Are there any tools (e.g like nodetool) that could be used to change >> the cassandra read and write quorums at run-time? >> >> In general what is a good strategy of changing these system parameters >> while cassandra is running? >> >> Any pointers could be useful! >> >> Thanks >> Muntasir. > > -- Best Regards Muntasir Raihan Rahman Email: muntasir.rai...@gmail.com Department of Computer Science, University of Illinois Urbana Champaign, 3111 Siebel Center, 201 N. Goodwin Avenue, Urbana, IL 61801
configuring read write quorums in cassandra
Hello, Are there any tools (e.g like nodetool) that could be used to change the cassandra read and write quorums at run-time? In general what is a good strategy of changing these system parameters while cassandra is running? Any pointers could be useful! Thanks Muntasir.
Re: subscribe request
I apologize for this silly mistake! Thanks Muntasir. On Thu, Feb 14, 2013 at 11:01 AM, Andy Twigg wrote: > i was hoping for a rick roll. > > On 14 February 2013 16:55, Eric Evans wrote: > > This is new. > > > > On Thu, Feb 14, 2013 at 9:24 AM, Muntasir Raihan Rahman > > wrote: > >> > >> > >> -- > >> Best Regards > >> Muntasir Raihan Rahman > >> Email: muntasir.rai...@gmail.com > >> Phone: 1-217-979-9307 > >> Department of Computer Science, > >> University of Illinois Urbana Champaign, > >> 3111 Siebel Center, > >> 201 N. Goodwin Avenue, > >> Urbana, IL 61801 > > > > > > > > -- > > Eric Evans > > Acunu | http://www.acunu.com | @acunu > -- Best Regards Muntasir Raihan Rahman Email: muntasir.rai...@gmail.com Phone: 1-217-979-9307 Department of Computer Science, University of Illinois Urbana Champaign, 3111 Siebel Center, 201 N. Goodwin Avenue, Urbana, IL 61801
