sensible data model ?

2012-02-04 Thread Franc Carter
Hi, I'm pretty new to Cassandra and am currently doing a proof of concept, and thought it would be a good idea to ask if my data model is sane . . . The data I have, and need to query, is reasonably simple. It consists of about 10 million entities, each of which have a set of key/value properties

GC performance in 1.0.x

2012-02-04 Thread Jonathan Ellis
We put a bunch of effort into reducing GC pauses in 1.0, which worked great on our synthetic benchmarks but I don't have much data on how well that's working in practice, on real-world workloads. If you're running a Cassandra app in production or testing, I'd appreciate it if you could send me [ei

Re: Cassandra OOM - 1.0.2

2012-02-04 Thread Jonathan Ellis
Sounds like you need to increase sysctl vm.max_map_count On Fri, Feb 3, 2012 at 7:27 PM, Ajeet Grewal wrote: > Hey guys, > > I am getting an out of memory (mmap failed) error with Cassandra > 1.0.2. The relevant log lines are pasted at > http://pastebin.com/UM28ZC1g. > > Cassandra works fine unti

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2012-02-04 Thread Giuseppe Zileni

Re: yet a couple more questions on composite columns

2012-02-04 Thread Yiming Sun
Thanks Andrey and Chris. It sounds like we don't necessarily have to use composite columns. From what I understand about dynamic CF, each row may have completely different data from other rows; but in our case, the data in each row is similar to other rows; my concern was more about the homogene

Re: yet a couple more questions on composite columns

2012-02-04 Thread R. Verlangen
I also made something like this a while ago. I decided to go for the 2-rows-solution: by doing that you don't have the need for super columns. Cassandra is really good at reading, so this should not be an issue. Cheers! 2012/2/4 Yiming Sun > Thanks Andrey and Chris. It sounds like we don't nec

Re: yet a couple more questions on composite columns

2012-02-04 Thread Yiming Sun
Interesting idea, R.V. But what did you do with the row keys? On Sat, Feb 4, 2012 at 2:29 PM, R. Verlangen wrote: > I also made something like this a while ago. I decided to go for the > 2-rows-solution: by doing that you don't have the need for super columns. > Cassandra is really good at read

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2012-02-04 Thread Dave Brosius
On 02/04/2012 12:05 PM, Andrea Loggia wrote: Unsubscribe If you wish to unsubscribe from the cassandra user list send a blank email here user-unsubscr...@cassandra.apache.org

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2012-02-04 Thread Mr.Quintero
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2012-02-04 Thread Mr.Quintero
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2012-02-04 Thread Mr.Quintero
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2012-02-04 Thread Mr.Quintero
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2012-02-04 Thread francesco . tangari . inf
stop this damn you -- francesco.tangari@gmail.com Inviato con Sparrow (http://www.sparrowmailapp.com/?sig) Il giorno sabato 4 febbraio 2012, alle ore 23.17, Mr.Quintero ha scritto: > > > Andrea Loggia (mailto:andrea.loggia...@gmail.com)> wrote: > > > Unsubscribe

Re: yet a couple more questions on composite columns

2012-02-04 Thread R. Verlangen
I just kept both row keys the same. This was very trivial for fetching them both. When you have A, you can fetch B, and vice versa. 2012/2/4 Yiming Sun > Interesting idea, R.V. But what did you do with the row keys? > > > On Sat, Feb 4, 2012 at 2:29 PM, R. Verlangen wrote: > >> I also made som

Re: yet a couple more questions on composite columns

2012-02-04 Thread Jim Ancona
I've used "special" values which still comply with the Composite schema for the metadata columns, e.g. a column of 1970-01-01:{accountId} for a metadata column where the Composite is DateType:UTF8Type. Jim On Sat, Feb 4, 2012 at 2:13 PM, Yiming Sun wrote: > Thanks Andrey and Chris.  It sounds li

Re: yet a couple more questions on composite columns

2012-02-04 Thread Yiming Sun
R.V., I am a little confused. I was under the impression that you cannot have two rows with the same key - unless you were referring to two different CFs? On Sat, Feb 4, 2012 at 6:11 PM, R. Verlangen wrote: > I just kept both row keys the same. This was very trivial for fetching > them both. Wh

Re: yet a couple more questions on composite columns

2012-02-04 Thread Yiming Sun
Interesting idea, Jim. Is there a reason you don't you use "metadata:{accountId}" instead? For performance reasons? On Sat, Feb 4, 2012 at 6:24 PM, Jim Ancona wrote: > I've used "special" values which still comply with the Composite > schema for the metadata columns, e.g. a column of > 1970-01

Re: read-repair?

2012-02-04 Thread Mr.Quintero

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2012-02-04 Thread Eric Evans
On Sat, Feb 4, 2012 at 4:17 PM, Mr.Quintero wrote: > > Andrea Loggia wrote: > >>Unsubscribe http://www.quickmeme.com/meme/35w46c/ -- Eric Evans Acunu | http://www.acunu.com | @acunu