IO scheduler for SSDs on EC2?

I was watching a talk recently on Elasticsearch performance in EC2, and they recommended setting the IO scheduler to noop for SSDs. Is that the case for Cassandra as well, or is it recommended to keep the default 'deadline' scheduler for Cassandra? Thanks.

bootstrap failure and strange gossiper state

I am also experiencing issues bootstrapping new nodes in my 2.0.10 Cassandra cluster. The first attempt to bootstrap ALWAYS fails, followed by a second bootstrap attempt that ALWAYS succeeds. The first attempt at bootstrapping fails with: INFO [main] 2015-03-15 02:41:02,550 StorageService.java

Re: IO scheduler for SSDs on EC2?

Hi Ali, The best practice is to use the noop scheduler on array of SSDs behind your block device (Hardware RAID controller). If you are using only one SSD disk, the deadline scheduler is the best choice to reduce IO latency. It is not recommended to set cfq on SSDs disks. Regards, Roni

Re: IO scheduler for SSDs on EC2?

On Sun, Mar 15, 2015 at 2:03 PM, Ali Akhtar ali.rac...@gmail.com wrote: I was watching a talk recently on Elasticsearch performance in EC2, and they recommended setting the IO scheduler to noop for SSDs. Is that the case for Cassandra as well, or is it recommended to keep the default

Begginer with cassandra Apache - Gossip

Hello All, Please, i'm newer with cassandra Apache. i'm sooo interested. i know some details about its architecture, some details also about gossip protocol. I'd like to test it, to more understand :) i ask if there is a howto tutorial that can help me ? Thanks a lot for help. Best Regards.

Re: Begginer with cassandra Apache - Gossip

Hi Jean, I have written three article that might be of help to you: http://abiasforaction.net/an-introduction-to-apache-cassandra/ http://abiasforaction.net/an-introduction-to-apache-cassandra/ http://abiasforaction.net/cassandra-architecture/ http://abiasforaction.net/cassandra-architecture/

Re: Begginer with cassandra Apache - Gossip

Hi Jean, Check our the following urls: https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/gms/ https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/gms/Gossiper.java

Re: Begginer with cassandra Apache - Gossip

Ok i will read all documents :) thanks a lot for help :) Please, can i you send me some details (url of source code) about the implementation of gossip protocol used in cassandra ? thanks a lot for help :) i find this https://github.com/bpot/node-gossip ? Bests. 2015-03-15 22:38 GMT+01:00 Akhil

Is Table created in all the nodes if the default consistency level used

Could you tell me whether the meta data of the new table are build in all the nodes after execute the following statement. cassandra_session.execute_async( “““CREATE TABLE Table_test( ID uuid, Time timestamp, Value double, Date timestamp, PRIMARY KEY