There's no easy and efficient way to implement auto_increment keys in
cassandra. So people usually use UUIDs
(http://en.wikipedia.org/wiki/UUID) for this purpose, which is
considered globally unique.
If you can use one of the fields from your data model as a unique key,
better use it instead of
Hi David, I have a few questions (and answers), see inline
On Tue, Apr 27, 2010 at 12:49 PM, David Boxenhorn da...@lookin2.com wrote:
Hi all,
I'm trying to install a Cassandra development environment for Java. It is
much harder than I thought it would be
I got Cassandra up and running
Thanks, Ran. Very nice to meet you!
Responses inline. Summary: I downloaded and unzipped Thrift and Hector. I
included them in my project. What do I do now?
On Tue, Apr 27, 2010 at 1:01 PM, Ran Tavory ran...@gmail.com wrote:
Hi David, I have a few questions (and answers), see inline
On Tue,
That was a lame joke - here it is (in the mail). I can use some help with
it, but what we have now for hector is here
http://wiki.github.com/rantav/hector/
http://wiki.github.com/rantav/hector/And for thrift, at lease the parts I
know of: http://wiki.apache.org/cassandra/ThriftExamples but you
good link, thanks, can I get one done for hector as? :)
There are some wiki pages and blog posts in the above mentioned links so
they are a good start for hector, then there are some unit tests, but I
certainly would appreciate help from the community here.
On Tue, Apr 27, 2010 at 1:25 PM,
Do you use Hecor? Do you find it useful?
Contribute back by helping others getting started and learn.
The hector dev team would appreciate help writing documentation for hector.
So far we have a few blog posts, a wiki and unit-tests, but proper
documentation, tutorials and examples aren't there
Some background: I am part of a team which is working on a rather large
internet program. It is currently using an RDBMS, but we want to start using
Cassandra. I'm working in Eclipse.
I downloaded and unzipped hector-0.6.0-11.zip and got a whole bunch of jars,
most of which don't look like
So I should get rid of my Thrift project?
On Tue, Apr 27, 2010 at 2:11 PM, Ran Tavory ran...@gmail.com wrote:
It includes thrift, yes.
You need cassandra as well (the jar includes both client and server code)
On Apr 27, 2010 2:03 PM, David Boxenhorn da...@lookin2.com wrote:
Some
Thanks for all your help, Ran! (I'll probably be needing more, later...)
On Tue, Apr 27, 2010 at 2:28 PM, Ran Tavory ran...@gmail.com wrote:
if you're speaking of an eclipse thrift project, then I don't think you
need one, no.
On Tue, Apr 27, 2010 at 2:14 PM, David Boxenhorn
Hi all,
if the node that proccesses my write fails, I should retry my write. If my
write increments some counter, the counter will be incremented several times
instead of just once.
Does Cassandra support any mechanism to identify write retries to avoid
multiple exacution?
Maxim
get_range_slices works fine in the system tests, so something is wrong
on your client side. Some possibilities:
- sending to a non-Thrift port
- using an incompatible set of Thrift bindings than the one your
server supports
- mixing a framed client with a non-framed server or vice versa
I just saw this note from storage-conf.xml:
Except in very unusual circumstances you will have one Keyspace per
application.
Why is that?
I was thinking of putting our normal data and indexes in separate
keyspaces so they could be maintained separately.
What are the disadvantages of multiple
Can anyone help with this? It is preventing me from getting backups of our
cluster.
Lee Parker
On Mon, Apr 26, 2010 at 10:02 PM, Lee Parker l...@socialagency.com wrote:
I was attempting to get a snapshot on our cassandra nodes. I get the
following error every time I run nodetool ...
Have you read this?
http://forums.sun.com/thread.jspa?messageID=9734530
http://forums.sun.com/thread.jspa?messageID=9734530I don't think EC2
instances have any swap.
On Tue, Apr 27, 2010 at 10:16 AM, Lee Parker l...@socialagency.com wrote:
Can anyone help with this? It is preventing me from
Assuming a ColumnFamily with a CompareWith of TimeUUIDType, is it possible
to call get_slice with an arbitrary date range? How would valid values for
the start and finish attributes of the slice range be constructed?
Thanks
Ed
Adding a swapfile fixed the error, but it doesn't look as though the process
is even using the swap file at all.
Lee Parker
On Tue, Apr 27, 2010 at 9:49 AM, Eric Hauser ewhau...@gmail.com wrote:
Have you read this?
http://forums.sun.com/thread.jspa?messageID=9734530
The only advantage is the RF is per keyspace
On Tue, Apr 27, 2010 at 6:57 AM, David Boxenhorn da...@lookin2.com wrote:
I just saw this note from storage-conf.xml:
Except in very unusual circumstances you will have one Keyspace per
application.
Why is that?
I was thinking of putting our
Thanks!. er, what is RF?
On Tue, Apr 27, 2010 at 6:50 PM, banks bankse...@gmail.com wrote:
The only advantage is the RF is per keyspace
On Tue, Apr 27, 2010 at 6:57 AM, David Boxenhorn da...@lookin2.comwrote:
I just saw this note from storage-conf.xml:
Except in very unusual
Replication Factor, the number of copies (replicas) of the data that
Cassandra will store and an important number for quorum consistency
calculations.
On Tue, Apr 27, 2010 at 11:14 AM, David Boxenhorn da...@lookin2.com wrote:
Thanks!. er, what is RF?
On Tue, Apr 27, 2010 at 6:50 PM, banks
To check that rows are gone, I check that KeySlice.columns is empty. And as
I mentioned, immediately after the delete job, this returns the expected
number.
Unfortunately I reproduced with QUORUM this morning. No node outages. I am
going to try ALL to see if that changes anything, but I am
The allocation of memory may have failed depending on the available virtual
memory, whether or not the memory would have been subsequently accessed by
the process. Some systems do the work of allocating physical pages only
when they are accessed for the first time. I'm not sure if yours is one of
You're going to have to build TimeUUIDs based on the date range you are
scanning. Problem is most UUID libraries build version 1 UUIDs based on the
current time. I was able to get this working in Python by changing the
library to allow me to pass in a time. This isn't safe for creating unique
Hello,
I'm importing some data on Cassandra, running only on my laptop, with all
config values by default. After some time running the import script I've
written (which includes some reads besides the import writes), I get the
following error message and stack trace:
Thanks Ryan for the fast response! Can you explain to me why binding against
127.0.0.1 causes the problem? Maybe it's useful to point this out in the
documentation to avoid users deploy this kind of setups.
Thanks again!
El 27/04/2010, a las 17:28, Ryan King escribió:
It looks like you need
On Tue, Apr 27, 2010 at 1:31 PM, Lucas Di Pentima
lu...@di-pentima.com.ar wrote:
Thanks Ryan for the fast response! Can you explain to me why binding against
127.0.0.1 causes the problem? Maybe it's useful to point this out in the
documentation to avoid users deploy this kind of setups.
Are
El 27/04/2010, a las 17:34, Ryan King escribió:
On Tue, Apr 27, 2010 at 1:31 PM, Lucas Di Pentima
lu...@di-pentima.com.ar wrote:
Thanks Ryan for the fast response! Can you explain to me why binding against
127.0.0.1 causes the problem? Maybe it's useful to point this out in the
On Tue, Apr 27, 2010 at 1:38 PM, Lucas Di Pentima
lu...@di-pentima.com.ar wrote:
Nope, I'm doing some tests locally on my notebook (Macbook OSX 10.6.3 w/4GB
RAM). My script insert several hundred thousand columns with stable speed,
and then it exits throwing that exception.
Its possible
Hmm... Even after deleting with cl.ALL, I'm getting data back for some
rows after having deleted them. Which rows return data is
inconsistent from one run of the job to the next.
On Tue, Apr 27, 2010 at 1:44 PM, Joost Ouwerkerk jo...@openplaces.org wrote:
To check that rows are gone, I check
I have used the solution presented by Justin and it works just fine. When
you construct a TimeUUID with a specific timestamp and use that for the
start or finish of the range slice, cassandra will use the timestamp
embedded in the UUID even if that specific UUID doesn't exist in the index.
It is
I'm trying to model a one-to-many set of data in which both sides of the
relation may grow arbitrarily large.
There are arbitrarily many FOOs. For each FOO, there are arbitrarily many
BARs.
Both types are modeled as an object, containing multiple fields (columns) in
the application.
Given a
Clocks are in sync:
cluster04:~/cassandra$ dsh -g development date
Tue Apr 27 17:36:33 EDT 2010
Tue Apr 27 17:36:33 EDT 2010
Tue Apr 27 17:36:33 EDT 2010
Tue Apr 27 17:36:33 EDT 2010
Tue Apr 27 17:36:34 EDT 2010
Tue Apr 27 17:36:34 EDT 2010
Tue Apr 27 17:36:34 EDT 2010
Tue Apr 27 17:36:34 EDT
Just trying to get my head wrapped around everything here, so bare with me
:)
So Thrift can spit out generated code for any language, be it C#, Java or
python etc.
Hector is a higher level wrapper around the java generated code by Thrift.
Do I have this right?
And Hector is probably the most
On Tue, Apr 27, 2010 at 2:29 PM, Lucas Di Pentima
lu...@di-pentima.com.ar wrote:
El 27/04/2010, a las 18:11, Ryan King escribió:
On Tue, Apr 27, 2010 at 1:38 PM, Lucas Di Pentima
lu...@di-pentima.com.ar wrote:
Nope, I'm doing some tests locally on my notebook (Macbook OSX 10.6.3 w/4GB
Hi,
Here is a working example :
$mutation_map = array($key=array(Standard1 = array()));
for($column_name=0; $column_name$options['numcolumns']; $column_name++)
{
$column = new cassandra_Column(array('name' = $column_name, 'value'
= 'put your data here', 'timestamp' = time()));
El 27/04/2010, a las 19:00, Ryan King escribió:
On Tue, Apr 27, 2010 at 2:29 PM, Lucas Di Pentima
lu...@di-pentima.com.ar wrote:
El 27/04/2010, a las 18:11, Ryan King escribió:
On Tue, Apr 27, 2010 at 1:38 PM, Lucas Di Pentima
lu...@di-pentima.com.ar wrote:
Nope, I'm doing some tests
I can't see any advantage in using multiple keyspaces. It is highly unlikely
that several applications would share the same Cassandra cluster in any
nontrivial deployment.
Things more important than replication-factor, such as partitioner and ring
token distribution would be compromised by
2010/4/26 Roland Hänel rol...@haenel.me:
Typically, in the SQL world we use things like AUTO_INCREMENT columns
that
let us create a unique key automatically if a row is inserted into a
table.
auto_increment is an antipattern; it adds an extra key which you don't need
(usually). If your
Yes, Lucas was correct about the nature of my original question. I'm glad
to hear that Justin's solution works, it makes for a much simpler schema.
Ed
On Tue, Apr 27, 2010 at 3:06 PM, Lucas Di Pentima
lu...@di-pentima.com.arwrote:
El 27/04/2010, a las 18:23, Lee Parker escribió:
I have
embedded response, way down below...
On 2010-04-26, at 12:56 PM, Ryan King wrote:
On Sun, Apr 25, 2010 at 11:14 AM, Bob Hutchison
hutch-li...@recursive.ca wrote:
Hi,
I'm new to Cassandra and trying to work out how to do something that I've
implemented any number of times (e.g.
You'll want to follow https://issues.apache.org/jira/browse/CASSANDRA-580
On Tue, Apr 27, 2010 at 7:06 AM, Maxim Grinev ma...@grinev.net wrote:
Hi all,
if the node that proccesses my write fails, I should retry my write. If my
write increments some counter, the counter will be incremented
We're working on this in https://issues.apache.org/jira/browse/CASSANDRA-1014
On Tue, Apr 27, 2010 at 12:28 PM, Daniel Gimenez danie...@gmail.com wrote:
Hi everyone,
several days ago I was doing some tests in a Cassandra installation and
everything was right (few inserts, few deletions, few
You'll want to create a ticket at
https://issues.apache.org/jira/browse/CASSANDRA to add that, then.
On Mon, Apr 26, 2010 at 9:46 PM, Shuge Lee shuge@gmail.com wrote:
I know I can get thrift API version.
However, I writing a CLI for Cassandra in Python with readline support,
and it will
On Tue, Apr 27, 2010 at 7:05 PM, Jonathan Ellis jbel...@gmail.com wrote:
We're working on this in
https://issues.apache.org/jira/browse/CASSANDRA-1014
There's an easy workaround noted in the ticket if you're willing to
sacrifice a bit of performance: use batch mode instead of periodic for
import uuid
unique_key = uuid.uuid4()
if you using Python.
2010/4/28 Mark Robson mar...@gmail.com
2010/4/26 Roland Hänel rol...@haenel.me:
Typically, in the SQL world we use things like AUTO_INCREMENT columns
that
let us create a unique key automatically if a row is inserted into a
Hi all,
I use the thrift api to remove one key, and then use the
get_range_slices to get all the keys and find that the key which I
deleted is still there. I refer to the thrift api doc which says
get_range_slices will apply to all the keys including the deleted
keys. So my question is how can I
Yes, Hector is a higher level wrapper around the java thrift api, also
with other features such as connection poll.
Not sure whether there's something similar in python.
On Wed, Apr 28, 2010 at 5:54 AM, S Ahmed sahmed1...@gmail.com wrote:
Just trying to get my head wrapped around everything
So, after reading the thread which Eric posted earlier, I have created a
workaround for the issue. In my backup script, I add a swapfile with
swapon, tell cassandra to create the snapshots, then remove the swapfile
with swapoff. Then I continue with the rest of the work the backup script
needs
Hey Jeff,
I think this article addresses your question:
http://spyced.blogspot.com/2010/02/distributed-deletes-in-cassandra.html
-Greg
On Tue, Apr 27, 2010 at 10:14 PM, Jeff Zhang zjf...@gmail.com wrote:
Hi all,
I use the thrift api to remove one key, and then use the
get_range_slices to
48 matches
Mail list logo
