Not exactly. You mean one data will be put in four nodes which have 25%? If
does, how about two replica?
From: Viktor Jevdokimov [mailto:viktor.jevdoki...@adform.com]
Sent: Thursday, January 13, 2011 2:59 PM
To: user@cassandra.apache.org
Subject: RE: about the data directory
I have 4 nodes,
I have 4 nodes, then I I create one keyspace (such as FOO) with replica
factor =1 and insert an data, why I can see the directory of
/var/lib/Cassandra/data/FOO in every nodes? As I know, I just have one replica
The schema (keyspaces and column families) are global across the
cluster
I agree with you totally. but I want to know which node is the data kept? I
mean which way to know the actual data kept?
-Original Message-
From: sc...@scode.org [mailto:sc...@scode.org] On Behalf Of Peter Schuller
Sent: Thursday, January 13, 2011 4:20 PM
To: user@cassandra.apache.org
I agree with you totally. but I want to know which node is the data kept? I
mean which way to know the actual data kept?
If you're just doing testing, you might 'nodetool flush' each host and
then look for the sstable being written. Prior to a flush, it's going
to sit in a memtable in memory
So you mean just the replica node 's sstable will be changed ,right?
If all the replica node broke down, whether the users can read the data?
-Original Message-
From: sc...@scode.org [mailto:sc...@scode.org] On Behalf Of Peter Schuller
Sent: Thursday, January 13, 2011 4:32 PM
To:
It is unlikely that both racing threads will have exactly the same
microsecond timestamp at the moment of creating a new user - so if data you
read
have exactly the same timestamp you used to write data - this is your data.
I think this would have to be combined with CL=QUORUM for both write and
Hi everyone.
I have a question about data modeling in my application. I have to store
items of a customer, and I can do it in one fat row per customer where
the column name is the id and the value a json serialized object, or one
entry per item with the same layout. This data is updated almost
Hello Scott,
6 month later but maybe you are still interested. I wrote an article on the
subject of migrating EERD models to Cassandra on the Cassandra wiki.
Have a look and tell me what you think of it:
http://wiki.apache.org/cassandra/ThomasBoose/EERD%20model%20components%20to%20Ca
Thanks for your answer.
You're right when you say it's unlikely that 2 threads have the same
timestamp, but it can. So it could work for user creation, but maybe
not on a more write intensive problem.
Moreover, we cannot rely on fully time synchronized node in the
cluster (but on node
On Jan 12, 2011, at 12:40 PM, Jairam Chandar wrote:
Hi folks,
We have a Cassandra 0.6.6 cluster running in production. We want to run
Hadoop (version 0.20.2) jobs over this cluster in order to generate reports.
I modified the word_count example in the contrib folder of the cassandra
So you mean just the replica node 's sstable will be changed ,right?
The data will only be written to the nodes that are part of the
replica set fo the row (with the exception of hinted handoff, but
that's a different sstable).
If all the replica node broke down, whether the users can read the
Gary Dusbabek gdusbabek at gmail.com writes:
On Tue, Nov 3, 2009 at 15:44, mobiledreamers at gmail.com wrote:
ERROR - Exception encountered during startup.
java.net.BindException: Cannot assign requested address
at sun.nio.ch.Net.bind(Native Method)
at
The Cassandra PMC has voted to add Jake as a committer. (Jake is also
a committer on Thrift.)
Welcome, Jake, and thanks for the hard work!
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com
Thanks Jonathan and Cassandra PMC!
Happy to help Cassandra take over the world!
-Jake
On Thu, Jan 13, 2011 at 1:41 PM, Jonathan Ellis jbel...@gmail.com wrote:
The Cassandra PMC has voted to add Jake as a committer. (Jake is also
a committer on Thrift.)
Welcome, Jake, and thanks for the
Hi,
I am running a 15 node cluster ,version 0.6.8, Linux 64bit OS, using
mmap I/O, 6GB ram allocated. I have row cache enabled to 8 keys
(mean row size is 2KB). I am observing a strange behaviour.. I query for
1.6 Million rows across the cluster and time taken is around 40 mins , I
query the
does the cache size change between 2nd and 3rd time?
On Thu, Jan 13, 2011 at 10:47 AM, Saket Joshi sjo...@touchcommerce.com wrote:
Hi,
I am running a 15 node cluster ,version 0.6.8, Linux 64bit OS, using mmap
I/O, 6GB ram allocated. I have row cache enabled to 8 keys (mean row
size is
Three cheers!
On Thu, Jan 13, 2011 at 1:45 PM, Jake Luciani jak...@gmail.com wrote:
Thanks Jonathan and Cassandra PMC!
Happy to help Cassandra take over the world!
-Jake
On Thu, Jan 13, 2011 at 1:41 PM, Jonathan Ellis jbel...@gmail.com wrote:
The Cassandra PMC has voted to add Jake as a
Yes it does change.
-Original Message-
From: Jonathan Ellis [mailto:jbel...@gmail.com]
Sent: Thursday, January 13, 2011 11:01 AM
To: user
Subject: Re: cassandra row cache
does the cache size change between 2nd and 3rd time?
On Thu, Jan 13, 2011 at 10:47 AM, Saket Joshi
I'm just starting to play with Cassandra, so this is almost certainly
a conceptual problem on my part, so apologies in advance. I was
testing out how I'd do things like bring up new nodes. I've got a
simple 2-node cluster with my only keyspace having
replication_factor=2. This is on 32-bit Debian
Slow. Look at the Play Framework, http://www.playframework.org/, with a
Java client.
On Thu, Jan 13, 2011 at 12:17 PM, Ertio Lew ertio...@gmail.com wrote:
I need to choose one amongst several client options to work with
Cassandra for a serious web application for production environments. I
I'm not sure if this is entirely true, but I *think* older version of
cassandra used a version of the ConcurrentLinkedHashmap (which backs
the row cache) that used the Second Chance algorithm, rather than LRU,
which might explain this non-LRU-like behavior. I may be entirely
wrong about this
All,
Could someone tell me where (what classes) or what library is Cassandra using
for its bloom filters?
Thanks
Carlos
This email message and any attachments are for the sole use of the intended
recipients and may contain proprietary and/or confidential information which
may be privileged
The cache is 800,000 per node , I have 15 nodes in the cluster. I see the cache
value increased after the first run, the row cache hit rate was 0 for first
run. For second run of the same data , the hit rate increased to 30% but on the
third it jumps to 99%
-Saket
-Original Message-
It is impossible to properly bootstrap a new node into a system where
there are not enough nodes to satisfy the replication factor. The
cluster as it stands doesn't contain all the data you are asking it to
replicate on the new node.
Gary.
On Thu, Jan 13, 2011 at 13:13, Mark Moseley
On 01/13/2011 04:07 PM, Carlos Sanchez wrote:
Could someone tell me where (what classes) or what library is Cassandra using
for its bloom filters?
src/java/org/apache/cassandra/utils/BloomFilter.java
We use SimpleCassie in production right now.
http://code.google.com/p/simpletools-php/wiki/SimpleCassie
On 01/13/2011 11:17 AM, Ertio Lew wrote:
I need to choose one amongst several client options to work with
Cassandra for a serious web application for production environments. I
prefer to
Is it possible that your are reading at READ.ONE and that READ.ONE
only warms cache on 1 of your three nodes= 20. 2nd read warms another
60%, and by the third read all the replicas are warm? 99% ?
This would be true if digest reads were not warming caches.
Edward
On Thu, Jan 13, 2011 at 4:07
On Thu, Jan 13, 2011 at 1:08 PM, Gary Dusbabek gdusba...@gmail.com wrote:
It is impossible to properly bootstrap a new node into a system where
there are not enough nodes to satisfy the replication factor. The
cluster as it stands doesn't contain all the data you are asking it to
replicate on
Guys,
I just installed python-cassandra 0.6.1 and Thrift 0.5.0 on my machine and I
would like to query against also write into a cassandra server. I guess i
am pretty weak in google-fu, there isn't any examples for me get started
with. Please help me on how to do this.
Thanks,
Felix
Can you post the settings you have for- listen_address- storage_port- rpc_address- rpc_portAlso the full error stack again, your original email has dropped off. can you use cassanra 0.7 ?AaronOn 14 Jan, 2011,at 05:22 AM, vikram prajapati prajapativik...@hotmail.com wrote:
ERROR 11:33:56,246
Dear all,
In a project I would like to store big objects in columns, serialized. For
example entire images (several Ko to several Mo), flash animations (several
Mo) etc...
Does someone use Cassandra with those relatively big columns and if yes does
it work well ? Is there any drawbacks using this
On Thu, Jan 13, 2011 at 2:38 PM, Victor Kabdebon
victor.kabde...@gmail.com wrote:
Dear all,
In a project I would like to store big objects in columns, serialized. For
example entire images (several Ko to several Mo), flash animations (several
Mo) etc...
Does someone use Cassandra with those
Pycassahttps://github.com/pycassa/pycassaHas documentation herehttp://pycassa.github.com/pycassa/Where does python-cassandra live ?AaronOn 14 Jan, 2011,at 11:34 AM, felix gao gre1...@gmail.com wrote:Guys,I justinstalledpython-cassandra 0.6.1 andThrift 0.5.0 on my machine and I would like to query
this is where it is stored
/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/
On Thu, Jan 13, 2011 at 2:39 PM, Aaron Morton aa...@thelastpickle.comwrote:
Pycassa https://github.com/pycassa/pycassa
Has documentation here http://pycassa.github.com/pycassa/
Is there any recommanded maximum size for a Column ? (not the very upper
limit which is 2Gb)
Why is it useful to chunk the content into multiple columns ?
Thank you,
Victor K.
2011/1/13 Ryan King r...@twitter.com
On Thu, Jan 13, 2011 at 2:38 PM, Victor Kabdebon
victor.kabde...@gmail.com
Sorry, I meant where did you get python-cassandra from on the web.Can you use Pycassa, even just as a learning experience ? There is a tutorial herehttp://pycassa.github.com/pycassa/tutorial.htmlAOn 14 Jan, 2011,at 11:42 AM, felix gao gre1...@gmail.com wrote:this is where it is
Right, python-cassandra just provides the raw Thrift API, which is no fun at
all. You should start out with pycassa.
- Tyler
On Thu, Jan 13, 2011 at 4:45 PM, Aaron Morton aa...@thelastpickle.comwrote:
Sorry, I meant where did you get python-cassandra from on the web.
Can you use Pycassa,
On Thu, Jan 13, 2011 at 2:44 PM, Victor Kabdebon
victor.kabde...@gmail.com wrote:
Is there any recommanded maximum size for a Column ? (not the very upper
limit which is 2Gb)
Why is it useful to chunk the content into multiple columns ?
I think you're going to have to do some tests yourself.
Ok thank you very much for these information !
If somebody has more insights on this matter I am still interested !
Victor K.
2011/1/13 Ryan King r...@twitter.com
On Thu, Jan 13, 2011 at 2:44 PM, Victor Kabdebon
victor.kabde...@gmail.com wrote:
Is there any recommanded maximum size for a
Ah, i get it now. The python code generated from running ant gen-thrift-py .IMHO Start with Pycassa *even* if you want to go your own way later. It solves a lot of problems for you and will save you time.AOn 14 Jan, 2011,at 11:46 AM, Tyler Hobbs ty...@riptano.com wrote:Right, python-cassandra just
Thanks guys, playing around with pycassa right now. seems pretty good.
On Thu, Jan 13, 2011 at 2:56 PM, Aaron Morton aa...@thelastpickle.comwrote:
Ah, i get it now. The python code generated from running ant gen-thrift-py
.
IMHO Start with Pycassa *even* if you want to go your own way later.
On Thu, Jan 13, 2011 at 2:00 PM, Edward Capriolo edlinuxg...@gmail.com wrote:
Is it possible that your are reading at READ.ONE and that READ.ONE
only warms cache on 1 of your three nodes= 20. 2nd read warms another
60%, and by the third read all the replicas are warm? 99% ?
This would be true
It's ip address problem, whether you ip address had changed? Please confirm it
and restart the Cassandra.
-Original Message-
From: vikram prajapati [mailto:prajapativik...@hotmail.com]
Sent: Friday, January 14, 2011 12:23 AM
To: user@cassandra.apache.org
Subject: Re:
Hey folks,
We've discovered an issue on Ubuntu/Lenny with libc6 2.11.1-0ubuntu7.5 (it
may also affect versions between 2.11.1-0ubuntu7.1 and 2.11.1-0ubuntu7.4).
The bug affects systems when a large number of threads (or processes) are
created rapidly. Once triggered, the system will become
Hi all,
More specifically, I added two rows of data. Row A
(users['A']['state']='UT') is added before I add indexing to the column
and the Row B (users['B']['state']='UT') after indexing. When I call
get_indexed_slices (state='UT') to query the two rows, only the Row B is
returned. It's as if
On Thu, Jan 13, 2011 at 7:56 PM, raoyixuan (Shandy)
raoyix...@huawei.com wrote:
I have some confused, why do the users can read the data in all nodes? I mean
the data just be kept in the replica, how to achieve it?
-Original Message-
From: sc...@scode.org [mailto:sc...@scode.org] On
as a administrator, I want to know why I can read the data from any node,
because the data just be kept the replica. Can you tell me? Thanks in advance.
-Original Message-
From: Edward Capriolo [mailto:edlinuxg...@gmail.com]
Sent: Friday, January 14, 2011 9:44 AM
To:
I would like to keep the reference of other rows as names of super
column and sort those super columns according to time.
Is there any way I could implement that ?
Thanks in advance!
You could make the time an a fixed width integer and prefix your row keys with it, then set the comparotor to ascii or utf.Some issues:- Will you have time collisions ?- Not sure what your are storing in the super columns, but their are
hi,
the time-to-live feature in 0.7 is very nice and it made me want to ask about
a somewhat similar feature.
i have a stream of data consisting of entities and associated samples. so i
create
a row for each entity and the columns in each row contain the samples for that
entity.
when i
May or may not be related but I thought I'd recount a similar experience we
had in EC2 in hopes it helps someone else.
As background, we had been running several servers in a 0.6.8 ring with no
Cassandra issues (some EC2 issues, but none related to Cassandra) on
multiple EC2 XL instances in a
51 matches
Mail list logo
