Re: Cassandra slow on some reads

Whooops  On one of the nodes when running my tests I found an exception java FileNotFoundException : file -Data.db not found at org.apache.cassandra.io.compress.CompressedThrottledReader.open(CompressedThrottledReader.java:52 also got another one coming from java.io.RandomAccessFile.o

Re: Cassandra slow on some reads

Post the server logs and traces of one of the lengthy queries? On 15 Mar 2014 20:49, "Batranut Bogdan" wrote: > Hello, > > Yes for the first query the server can be slow but no matter what is > should not take 10 seconds to get one key from a column family. I can see > this happening if I have ti

Re: Cassandra slow on some reads

Hello, Yes for the first query the server can be slow but no matter what is should not take 10 seconds to get one key from a column family. I can see this happening if I have times like 20 ms for some queries and let's say 300 ms for uncached ones. But I have responses that take from 8 to 20 ms

Re: Serial Consistency and Thrift API

Thanks for all your replies. I was thinking to modify YCSB to support lightweight transactions in order to measure the overhead introduced. Since YCSB extends thrift api this is the only way to do it. I am not quite sure how to use CAS but I am now looking at it. If there is an easier way to measur

Re: Scala Driver?

Here is an example wrapper how to use the DataStax java driver in scala https://github.com/stealthly/scala-cassandra /*** Joe Stein Founder, Principal Consultant Big Data Open Source Security LLC http://www.stealth.ly Twitter: @allthingshadoop ***

Re: Scala Driver?

Hi, You can use one of following libs: * https://github.com/Shimi/cascal * https://github.com/newzly/phantom On 15/03/14 21:42, NORD SC wrote: > Hi all, > > I am building a system using the Play 2 Framework with Scala and wonder what > driver I should use or whether I should wrap the Datas

Scala Driver?

Hi all, I am building a system using the Play 2 Framework with Scala and wonder what driver I should use or whether I should wrap the Datastax java-driver myself? Can you share any experience with the available drivers? I have looked a Phantom briefly which seems to use java-driver internally -

Relation between Atomic Batches and Consistency Level

Hi Guys, How do Atomic Batches and Consistency Level relate to each other? More specifically: - Is consistency level set/applicable per statement in the batch or the batch as a whole? - Say if I write a Logged Batch at QUORUM and read it back at QUORUM, what can I expect at normal, single nod

Re: Serial Consistency and Thrift API

thanks for sharing that info. I haven't needed to use CAS yet and haven't bothered to look at it. I'll have to document that for hector. On Sat, Mar 15, 2014 at 5:45 AM, Sylvain Lebresne wrote: > On Fri, Mar 14, 2014 at 7:59 PM, Panagiotis Garefalakis < > panga...@gmail.com> wrote: > >> >> Hello

Re: Serial Consistency and Thrift API

On Fri, Mar 14, 2014 at 7:59 PM, Panagiotis Garefalakis wrote: > > Hello all, > > I am running some tests in my cluster and I wanted to try some of the new > features of Cassandra like lightweight transactions and Serial Writes. > Surprisingly I found out that Serial writes are not supported by th