Re: cassandra hit a wall: Too many open files (98567!)

2012-01-17 Thread dir dir
Very Interesting Why you open so many file? Actually what kind of system that is built by you until open so many files? would you tell us? Thanks... On Sat, Jan 14, 2012 at 2:01 AM, Thorsten von Eicken wrote: > I'm running a single node cassandra 1.0.6 server which hit a wall > yesterday: >

Re: Integration Error between Cassandra and Eclipse

2012-01-07 Thread dir dir
I am also beginner user in cassandra. Honestly I wonder, if we can download binary installer from http://cassandra.apache.org/download/ but why we have to check out from: svn http://svn.apache.org/repos/asf/cassandra/trunk/cassandra-trunk ?? What is the deference between them? Can we perform ca

Hector and CQL

2012-01-05 Thread dir dir
Hi Folk, I am a beginner user in Cassandra. I have a question about the usage and integration (or installation) hector into eclipse IDE? I try to find the answer by googling, but I do not find a proper guidance to do it. Would you want to help me by telling me how to do it or showing me the proper

Re: Cassandra training on May 21 in Palo Alto

2010-05-09 Thread dir dir
In my opinion, To share the training material for us who do not living in the USA is a good idea. Thanks. Dir On Mon, May 10, 2010 at 2:25 AM, S Ahmed wrote: > I guess the hard part would be recording something so long (9-5pm) > > A video that is split between the screen (say powerpoint) and li

Re: value size, is there a suggested limit?

2010-04-26 Thread dir dir
Hi Ahmed, Casandra has a limitation to store value in to database. the maximum size is 2^31-1 byte. if you have more than 2^31-1 byte, I suggest you to create several chunk data. On Mon, Apr 26, 2010 at 3:19 AM, S Ahmed wrote: > Is there a suggested sized maximum that you can set the value of

Re: how to store file in the cassandra?

2010-04-26 Thread dir dir
Hi Jonathan, Cassandra seems has not a Blob data type. To handle binary large object data, we have to use array of byte. I have a question to you. Suppose I have a MPEG video files 15 MB. To save this video file into Cassandra database I will store this file into array of byte. One day, I feel thi

Re: The Difference Between Cassandra and HBase

2010-04-24 Thread dir dir
M, Paul Prescod wrote: > http://ria101.wordpress.com/2010/02/24/hbase-vs-cassandra-why-we-moved/ > > http://spyced.blogspot.com/2009/03/why-i-like-cassandra.html > > On Sat, Apr 24, 2010 at 10:20 AM, dir dir wrote: > > In general what is the difference between Cassandra and HBase?? > > > > Thanks. > > >

Re: Does anybody work about transaction on cassandra ?

2010-04-24 Thread dir dir
>No, it just means they don't have dependencies on each other. In this >case, it means you could create a transactional layer on top of >cassandra, without having to make it part of the core. Now I Understand, thank you. On Sun, Apr 25, 2010 at 12:46 AM, Jonathan Ellis wrote: > On Sat, Apr 24

Re: Does anybody work about transaction on cassandra ?

2010-04-24 Thread dir dir
uot;?? Thank you. On Sun, Apr 25, 2010 at 12:30 AM, Benoit Perroud wrote: > "orthogonal" means "go to the opposite direction, but without going > back". Including "transaction" in Cassandra needs to turn 90 degrees > the design of Cassandra. > > Kin

The Difference Between Cassandra and HBase

2010-04-24 Thread dir dir
In general what is the difference between Cassandra and HBase?? Thanks.

Re: Does anybody work about transaction on cassandra ?

2010-04-24 Thread dir dir
>Transactions are orthogonal to the design of Cassandra Sorry, Would you want to tell me what is an orthogonal mean in this context?? honestly I do not understand what is it. Thank you. On Thu, Apr 22, 2010 at 9:14 PM, Miguel Verde wrote: > No, as far as I know no one is working on transaction

Re: ORM in Cassandra?

2010-04-22 Thread dir dir
>So maybe it's weird to combine ORM and Cassandra, right? Is there >anything we can take from ORM? Honestly I do not understand what is your question. It is clear that you can not combine ORM such as Hibernate or iBATIS with Cassandra. Cassandra it self is not a RDBMS, so you will not map the tabl

Re: why read operation use so much of memory?

2010-04-19 Thread dir dir
Hi Jonathan, I see this page (http://wiki.apache.org/cassandra/SSTableMemtable) does not exist yet. thanks. Dir. On Tue, Apr 20, 2010 at 3:41 AM, Jonathan Ellis wrote: > (Moving to users@ list.) > > Like any Java server, Cassandra will use as much memory in its heap as > you allow it to. You

Re: Regarding Cassandra Scalability

2010-04-19 Thread dir dir
On Sun, Apr 18, 2010 at 9:14 AM, dir dir wrote: > > Hi Gary, > > > >>The main reason is that the compaction operation (removing deleted > >>values) currently requires that an entire row be read into memory. > > > > Thank you for your explanation. But I

Re: Regarding Cassandra Scalability

2010-04-18 Thread dir dir
es that entire row be read into memory" whether this is a problem of "out of memory"?? When we need to perform compaction operation?? In what situation we shall perform compaction operation?? Thank You. Dir. On Sun, Apr 18, 2010 at 7:41 PM, Gary Dusbabek wrote: > On Sat

Re: Regarding Cassandra Scalability

2010-04-17 Thread dir dir
tand the meaning from that statement. Thank you. Dir. On Sat, Apr 17, 2010 at 8:46 PM, Mason Hale wrote: > On Saturday, April 17, 2010, dir dir > > I want to ask to the advance user or experience software developer in > this forum, > > why tweeter.com choose Cassandra? would you

Re: Regarding Cassandra Scalability

2010-04-17 Thread dir dir
mike.e.gallam...@googlemail.com> wrote: > On 04/16/2010 01:38 AM, dir dir wrote: > > I hear Facebook.com and tweeter.com using cassandra database. In my > opinion Facebook and > tweeter have hundreds TB data. because their user reach hundreds million > people. > > I think you mig

Re: Cassandra Java Client

2010-04-17 Thread dir dir
What is a SpyMemCahced?? What is the correlation between SpyMemCahced and Cassandra?? Thank You. Dir. On Sat, Apr 17, 2010 at 3:10 AM, Weijun Li wrote: > I'm using spymemcached and it works great! Easy to use, support sharding > and compression and can handle high volume traffic. > > http://cod

Re: Regarding Cassandra Scalability

2010-04-16 Thread dir dir
I hear Facebook.com and tweeter.com using cassandra database. In my opinion Facebook and tweeter have hundreds TB data. because their user reach hundreds million people. Dir. On Fri, Apr 16, 2010 at 1:28 PM, Linton N wrote: > hi , > I am working for the past 1 year with hadoop, but qu

Re: [RELEASE] 0.6.0

2010-04-13 Thread dir dir
Any change or update in the new version (especially for the implementation in the Microsoft Windows)?? Thanks. Dir. On Tue, Apr 13, 2010 at 11:14 PM, Lee Parker wrote: > Any chance of an updated debian package? > > Lee Parker > l...@spredfast.com > > [image: Spredfast] > On Tue, Apr 13, 2010 a

Re: How to perform queries on Cassandra?

2010-04-10 Thread dir dir
2010 at 11:06 AM, Paul Prescod wrote: > No. Cassandra has an API. > > http://wiki.apache.org/cassandra/API > > On Fri, Apr 9, 2010 at 8:00 PM, dir dir wrote: > > Does Cassandra has a default query language such as SQL in RDBMS > > and Object Query in OODBMS? Thank

Re: How to perform queries on Cassandra?

2010-04-09 Thread dir dir
Does Cassandra has a default query language such as SQL in RDBMS and Object Query in OODBMS? Thank you. Dir. On Sat, Apr 10, 2010 at 7:01 AM, malsmith wrote: > > > It's sort of an interesting problem - in RDBMS one relatively simple > approach would be calculate a rectangle that is X km by Y km