Hi,
Yes, used only master.
i downloaded the tar file and placed in cassandra folder and run again
cassandra_helper cassandra
now i am getting
Error: Exception thrown by the agent : java.net.MalformedURLException: Local
host name
when set hostname to localhost or 127.0.0.1
i get Exception in
I guess I'm putting in the wrong email list. Sorry for this.
My question in short is: whether I can get a certain range of super column
in a single query?
I have checked the following APIs, but looks they don't work for this:
get: for a single column
get_slice: contains column_parent as
Hi
A little while ago I tried cassandra's read n write operations and timed it.
I am using Pandra for communication with cassandra. System is CentOS 5 with
2 GB RAM and dual core.
I inserted 10 rows in around 30 secs and read the same in 25 seconds.
If anyone of you have run similar tests
The supercolumn parameter to ColumnParent is optional precisely so you
can do this. http://wiki.apache.org/cassandra/API
On Mon, Apr 12, 2010 at 6:37 AM, Dop Sun su...@dopsun.com wrote:
I guess I'm putting in the wrong email list. Sorry for this.
My question in short is: whether I can get a
I dont think it would be a good idea not to use pandra for benchmarks as we
are going to use pandra for our application. Secondly, it will give Pandra
guys some boost to enhance the performance of thier library.
On Mon, Apr 12, 2010 at 6:05 PM, Jordan Pittier jordan.pitt...@gmail.comwrote:
Hi,
Also tried:
client.multiget_slice(ksName, mKeyList, parent, predicate,
ConsistencyLevel.ONE);
Gets the same result, if I put the super_column as null or empty array, it
returns nothing, but if I give the correct super_column value, it returns
expected 3 columns.
I'm using the Keyspace1.Super1.
Hello Colin,
El 12/04/2010, a las 07:52, Colin Yates escribió:
Hi,
In our architecture, our consultants want to perform some
analysis on the train, disconnected from the web.
How can I achieve this in Cassandra? I realise this isn't quite
the use-case that was thought about when the
Actually, to be honest I dont know how to insert 100 rows without PHP or
Pandra. If you could help me out I will surely try it and will share the
results with you guys.
On Mon, Apr 12, 2010 at 7:25 PM, Paul Prescod pres...@gmail.com wrote:
How will they know whether the performance problem
On Mon, Apr 12, 2010 at 3:52 AM, Colin Yates colin.ya...@gmail.com wrote:
Hi,
In our architecture, our consultants want to perform some
analysis on the train, disconnected from the web.
How can I achieve this in Cassandra? I realise this isn't quite
the use-case that was thought about when
First, read carefully and understand :
http://wiki.apache.org/cassandra/ThriftExamples#PHP
But you really shouldn't bother with benchmarks. Ask yourself this question
: what if my Cassandra performs at 5k operation/s ? And what about 3k
op/s?. In other terms why are you benchmarking ?. You've got
contrib/py_stress
Although that's still written in a scripting language, it at least
uses threading.
Anyhow, what's your real goal? Inserting 100K or 1M rows in 30 seconds
from a single-threaded environment like PHP is pretty good. Do your
business goals require more?
Also: Is it 100K or 1M? In
I am a newbie with Cassandra. We are currently migrating a large amount of
data out of MySQL into Cassandra. I have two ColumnFamilies. One contains
one row per item and each item has roughly 12 columns. These are items from
REST APIs like the Twitter API. Then I have a second ColumnFamily
unknown result means thrift is badly confused. You will get this when
using the same thrift connection from multiple threads, for instance.
On Mon, Apr 12, 2010 at 10:02 AM, Lee Parker l...@socialagency.com wrote:
I am a newbie with Cassandra. We are currently migrating a large amount of
data
If the connections are being made by individual PHP processes running from
the command line, they shouldn't be using the same connection. Should my
code close the connections after each query and open a new one?
Here is the flow of what is happening when we get the error:
1. Get a set of items
Then you're probably using a client incompatible with the server
version you're using.
On Mon, Apr 12, 2010 at 10:24 AM, Lee Parker l...@socialagency.com wrote:
If the connections are being made by individual PHP processes running from
the command line, they shouldn't be using the same
According to his docs, he says you need Cassandra = 0.5.0. I guess it is
possible that the included thrift files are targeted at 0.6, but I don't see
the batch_mutate method which is part of 0.6. So I'm assuming that it
should work fine with 0.5.0.
I have now changed some of those entries in
I'm guessing you missed the ant ivy-retrieve step.
We're planning on releasing a new gem today that should fix this issue.
-ryan
On Mon, Apr 12, 2010 at 3:30 AM, Nirmala Agadgar nirmala...@gmail.com wrote:
Hi,
Yes, used only master.
i downloaded the tar file and placed in cassandra folder
On Mon, 2010-04-12 at 01:31 +0200, Philippe wrote:
I have data that is two dimensional, time varying (think of a grid).
At each
cell of this grid,I store a binary array.
My data model will be
- single keyspace
- key = {Y dimension}
- super column family = {type of data
i also noticed unknown result errors when my php thrift code was
generated using a different version of thrift than cassandra uses.
after regenerating my php code from thrift-r917130 (for
cassandra-0.6.0-rc1), the errors stopped.
-keith
On Mon, Apr 12, 2010 at 9:40 AM, vineet daniel
Eric, Dop,
Thanks for your answers.
If I understand what you're asking, a rectangle (identified by X and Y
coordinates for a time-frame), will boil down to a single column. There
are certainly no problems with retrieving a single sub-column from a
super column.
I realize I wasn't clear
On Mon, Apr 12, 2010 at 3:45 PM, Time Less timelessn...@gmail.com wrote:
I'm confused. That's really worst-case? 3 iops?
max 3 per sstable, as RK clarified out.
What if we have 10B rows in the column family? What sort of index do you use
that would only require one iop to find the row index
It's not common for me to recommend CouchDB, but this is one instance it's
great for: synching complete datasets for disconnected use. Cassandra treats
disconnection as a problem, not something that should occur in the normal plan
of operations.
-Original Message-
From: Colin Yates
Cassandra treats disconnection as something that *does* occur, like it
or not, and deals with it well.
But there's no way to easily sync just some subset of data to your
laptop. Couch may well be better at doing that sort of thing.
On Mon, Apr 12, 2010 at 3:50 PM, David Timothy Strauss
So, it didn't get rid of the problem, i'm still getting the errors. The
only thing I can think of now is top upgrade to 0.6, but I would prefer to
stay with the current stable release. I have regenerated the thrift code
for 0.5.0 and there is no difference between those files and the ones i'm
On Mon, 2010-04-12 at 22:40 +0200, Philippe wrote:
If I understand what you're asking, a rectangle (identified by X and Y
coordinates for a time-frame), will boil down to a single column.
There
are certainly no problems with retrieving a single sub-column from a
super column.
I realize
Alright, so assuming we're looking for a slice of the grid against a
given time-frame, that would look something like:
get_range_slice(
keyspaceName,
ColumnParent(CFname, timeFrame),
SlicePredicate(
slice_range=SliceRange(xstart, xend, false, colCount)
),
ystart,
Hello,
Asked this question on Stack Oveflow
(http://stackoverflow.com/questions/2619744/searches-and-general-querying-with-hbase-and-or-cassandra-best-practices)
but didn't get much of answers. May be some Cassandra people can help
me and point to the right direction? So:
I have User model
On Tue, 2010-04-13 at 00:23 +0200, Philippe wrote:
Alright, so assuming we're looking for a slice of the grid against a
given time-frame, that would look something like:
get_range_slice(
keyspaceName,
ColumnParent(CFname, timeFrame),
SlicePredicate(
However, you are also saying there is no way to also take into account
the timeFrame supercolumn in the same API call ? IE, it is not
possible to get back a data structure keyed by
'key,supercolumn,column' hence y,x and timeframe which I can then
process to my heart's delight ?
If
What if we have 10B rows in the column family? What sort of index do you
use
that would only require one iop to find the row index block?
basically what is described in sections 5.3 and 5.4 here:
http://labs.google.com/papers/bigtable.html
Incorrect. Section 4 of the paper describes the
On Mon, Apr 12, 2010 at 4:27 PM, Time Less timelessn...@gmail.com wrote:
With this formula, we can already begin to formulate more useful answers to
the question. If I have 10B rows in my CF, and I can fit 10k rows per
SStable, and the SStables are spread across 5 nodes, and I have 1 bloom
On Tue, 2010-04-13 at 00:45 +0200, Philippe wrote:
However, you are also saying there is no way to also take
into account
the timeFrame supercolumn in the same API call ? IE, it is
not
possible to get back a data structure keyed by
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