What is the meaning of eventual consistency in Cassandra when nodes in
a single cluster do not mantain the copies of same data but rather
data is distributed among nodes. Since a single peice of data is
recorded at a single place(node),Why wouldn't Cassandra return the
recent value from that single
For what parts of a social network is Cassandra a good fit ? Is it
recommendable to throw all social network data into Cassandra
datastore specifically, what about the data for newsfeed generation
from user's network updates ?
Hi,
we have a couple of use cases with wide rows with a small portion of hot data
in them.
Example:
Chatlog:
{
$userid1-$userid2: [{timestamp: message}, {timestamp: message} ...]
}
People tend to check only the most recent pages. So while the current row cache
doesn't work with the
On Sun, Jan 2, 2011 at 3:45 PM, vicent roca daniel wrote:
> Hi guys, I need your help.
> I'm trying to insert a column name of type LongType using the ruby wrapper,
> but I can't get it working.
> What I'm trying is something like this:
> app.insert(:Data, 'device1-cpu', { Time.now => 1234.to_s
On Sat, Jan 1, 2011 at 2:42 PM, vicent roca daniel wrote:
> Hi guys, I'm new in this list && Cassandra :)
> I'm playing with Cassandra with the ruby wrapper, and I can't figurate out
> what's happing with this error...
> I have this:
> app = Cassandra.new('AOM', servers = "127.0.0.1:9160", :transp
While I think "adaptively cache just hot parts of the row wherever
they are" is not feasible, the limitations you describe should be
fine. I think it's a clever idea, and probably widely useful.
On Mon, Jan 3, 2011 at 10:48 AM, Daniel Doubleday
wrote:
> Hi,
>
> we have a couple of use cases with
Hi Ryan,
When I insert the column, I don't get any error. But, when I inspect the
contents, I don't see a valid number.
also, If I try to do a range query, I'm not getting the expected results.
On Mon, Jan 3, 2011 at 6:02 PM, Ryan King wrote:
> On Sun, Jan 2, 2011 at 3:45 PM, vicent roca danie
Sorry for this message. I realize that I was doing it wrong.
Thanks ryan.
On Mon, Jan 3, 2011 at 6:03 PM, Ryan King wrote:
> On Sat, Jan 1, 2011 at 2:42 PM, vicent roca daniel
> wrote:
> > Hi guys, I'm new in this list && Cassandra :)
> > I'm playing with Cassandra with the ruby wrapper, and I
On Mon, Jan 3, 2011 at 9:32 AM, vicent roca daniel wrote:
> Hi Ryan,
> When I insert the column, I don't get any error. But, when I inspect the
> contents, I don't see a valid number.
> also, If I try to do a range query, I'm not getting the expected results.
Please show the code you're using.
> Lets assume I have:
> * single 100GB SSTable file
> * min compaction threshold is set to 2
> If I delete rows which are located in this file. Is the only way to "clean"
> the deleted rows is by inserting another 100GB of data or by triggering a
> painful major compaction?
Major compaction does i
> Major compaction does it, but only if GCGraceSeconds has elapsed. See:
>
> http://spyced.blogspot.com/2010/02/distributed-deletes-in-cassandra.html
But to be clear, under the assumption that your data is a lot smaller
than the tombstones, a major compaction will definitely reclaim space
even i
> What is the meaning of eventual consistency in Cassandra when nodes in
> a single cluster do not mantain the copies of same data but rather
> data is distributed among nodes. Since a single peice of data is
> recorded at a single place(node),Why wouldn't Cassandra return the
> recent value from t
This means that nodes in cassandra cluster contain data that has been
sharded onto serveral nodes as well as this sharded data may be
replicated further across several nodes ? So cassandra storage
utilizes both sharded as well as replication for load balancing? Is
this correct ?
On Mon, Jan 3, 201
> This means that nodes in cassandra cluster contain data that has been
> sharded onto serveral nodes as well as this sharded data may be
> replicated further across several nodes ? So cassandra storage
> utilizes both sharded as well as replication for load balancing? Is
> this correct ?
Yes, sor
Hi again!
code:
require 'rubygems'
require 'cassandra'
app = Cassandra.new('AOM', servers = "127.0.0.1:9160")
app.insert(:NumData, 'device1-cpu', { Time.now => 10.to_s })
storag-confl.xm.
Thanks!!
On Mon, Jan 3, 2011 at 6:52 PM, Ryan King wrote:
> On Mon, Jan 3, 2011 at 9:32 AM,
On Mon, Jan 3, 2011 at 12:56 PM, vicent roca daniel wrote:
> Hi again!
> code:
> require 'rubygems'
> require 'cassandra'
> app = Cassandra.new('AOM', servers = "127.0.0.1:9160")
> app.insert(:NumData, 'device1-cpu', { Time.now => 10.to_s })
I'm going to assume you're getting an exception here? I
hi,
no I'n not getting any exception.
The value gets inserted withou problem.
If I try to convert to string I get:
Cassandra::Comparable::TypeError: Expected "2011-01-03 22:14:40 +0100" to
cast to a Cassandra::Long (invalid bytecount)
from
/Users/armandolalala/.rvm/gems/ruby-1.9.2-p0/gems/cassandr
On Mon, Jan 3, 2011 at 1:15 PM, vicent roca daniel wrote:
> hi,
> no I'n not getting any exception.
Then what problem are you seeing?
-ryan
> The value gets inserted withou problem.
> If I try to convert to string I get:
> Cassandra::Comparable::TypeError: Expected "2011-01-03 22:14:40 +0100" t
The problem I think I have is that I think I'm not storing the correct
value.
If I do this (for example):
app.insert(:NumData, 'device1-cpu', { Time.now + 1 minut => 10.to_s })
app.insert(:NumData, 'device1-cpu', { Time.now + 1 minu => 10.to_s })
app.insert(:NumData, 'device1-cpu', { Time.now + 1
Hi everyone,
I've been lurking in the #cassandra IRC channel lately looking for help
on this, but wanted to try the mailing list as well.
We have 3 nodes, and last week it was suggested that I run 'nodetool
move' to reset our token values on the 3 nodes because they were
randomly assigned wh
My company is looking to develop a software prototype based off Cassandra in
the cloud. We except to run 5 - 10 NoSQL servers for the prototype. I've
read online (Jonathan Ellis was pretty vocal about this) that EC2 has some
I/O issues. Is the general consensus to run Cassandra on EC2 or Rackspace?
On Mon, Jan 3, 2011 at 3:04 PM, Cassy Andra wrote:
> My company is looking to develop a software prototype based off Cassandra in
> the cloud. We except to run 5 - 10 NoSQL servers for the prototype. I've
> read online (Jonathan Ellis was pretty vocal about this) that EC2 has some
> I/O issues. Is
Since it's all pay-for-use, you could build your system on both, then do
whatever stress testing you want.
The cassandra part of your app should be unchanged between different cloud
providers.
Personally, I'm using EC2 and don't have any complaints.
Dave Viner
On Mon, Jan 3, 2011 at 3:49 PM, R
EBS volumes don't work well, but the instance local disks are fine on EC2. Also
the smaller instance types are a lot slower on I/O than the bigger ones. We are
using local disk on m2.2xl or 4xl (to get lots of RAM). Don't use the m1.small
instances.
Adrian
From: Dave Viner mailto:davevi...@gma
Hi All,
I am fresh on Cassandra, and I want to know some topics have been
discussed before.
But I don't known how can I find the old topics before 2010-08-19.
The oldest thread I found is
http://www.mail-archive.com/user@cassandra.apache.org/mail15.html
Can someone told me?
Thank you.
Bin
http://mail-archives.apache.org/mod_mbox/cassandra-user/
On Mon, Jan 3, 2011 at 11:40 PM, wang bin wrote:
> Hi All,
>
> I am fresh on Cassandra, and I want to know some topics have been
> discussed before.
> But I don't known how can I find the old topics before 2010-08-19.
> The oldest threa
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