Hello Everyone,
I am doing study on cassandra to make use of it for the below problem -
My current system has many components. To complete any transaction(request),
it has to pass through all the components. While it passes through, there is
no clear visibility to know what is happening behind ea
From what you have described that sounds OK (am assuming there is not millions
of events per transaction). When designing the model consider all the ways you
will want to read the data back and then dernomalize the data appropriately.
Ideally each request for data from cassandra should be handle
Ok I have two test servers, they are RH and pretty nice. I have two problems
with one of them and none with the other. Same configuration but the seed and
listen address that is their opposites. Nothing fancy. RF=2
All info I can get is also here and some more like conf, 590 rows
http://pastie.o
Hi,
I came across this presentation (link below) by Sarkissian (no first name
given) at Digg about their use of Cassandra. On page 27 he says "Custom
comparators turn out to be key" and mentions in the next few slides a
LongString (actually once a LongString the other times a LongSting, but I'm
Or this one =)
Server error was indeed an error but on my behalf.
If you try to memlock more than available memory on server it will kernel crash
Also
If you use swap as ram it will be having a lot of trouble
/J
AB SVENSKA SPEL
106 10 Stockholm
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To follow up on this post: the PHP implementation of Avro has been committed
to trunk (see https://issues.apache.org/jira/browse/AVRO-627) and will be
available in the 1.4.0 release, which is being voted on currently.
On Wed, Aug 25, 2010 at 7:39 PM, Jeremy Hanna wrote:
> For those interested in
Hi guys,
I'm new in cassandra development and I would like to know witch is the best
(stable) client in Ruby to use with Cassandra? It will be use in a rails
project, but it don't need to be "Active Record" like.
Thanks
Guilherme
On Tue, Aug 31, 2010 at 11:58 PM, Gasol Wu wrote:
> great to see
On Wed, Sep 1, 2010 at 9:03 AM, Matthew Conway wrote:
> If you need to tunnel jconsole to a remote cassandra instance, the SSH socks
> proxy (ssh -D)is the easiest, least intrusive way. More details:
>
> http://simplygenius.com/2010/08/jconsole-via-socks-ssh-tunnel.html
>
> Matt
>
>
Matts approa
Thanks for writing this up!
On Wed, Sep 1, 2010 at 6:03 AM, Matthew Conway wrote:
> If you need to tunnel jconsole to a remote cassandra instance, the SSH socks
> proxy (ssh -D)is the easiest, least intrusive way. More details:
>
> http://simplygenius.com/2010/08/jconsole-via-socks-ssh-tunnel.h
I believe the problem here is with Pelops. The batch_mutate does a
flush and the pelops flush is not required. Removing the flush from
pelops fixes the issue.
By chance is anyone that has seen this error using Pelops?
On 8/31/10 6:54 PM, Carl Bruecken wrote:
I've made some progress on na
I saw this with pelops and only with batch mutate. Other calls worked
fine.
On 09/01/2010 08:16 AM, Carl Bruecken wrote:
I believe the problem here is with Pelops. The batch_mutate does a
flush and the pelops flush is not required. Removing the flush from
pelops fixes the issue.
By cha
Hey Kevin,
It looks to me like they use LongString to sort primarily by the Long, then
secondarily by the String portion of a "LongString". I believe all you
would need to do to implement this is to add a class to
src/java/org/apache/cassandra/db/marshal . I would recommend copying
LongType to s
On Wed, Sep 1, 2010 at 4:40 AM, Guilherme Defreitas
wrote:
> Hi guys,
> I'm new in cassandra development and I would like to know witch is the best
> (stable) client in Ruby to use with Cassandra? It will be use in a rails
> project, but it don't need to be "Active Record" like.
Try http://github
A few months ago, there was a thread on this list about using Cassandra
across multiple EC2 regions. I was interested in doing in doing
the same thing, and managed to make it work.
To implement this, there are basically two things that need to change.
First, in storage-conf.xml, I used the "ext
On Sep 1, 2010, at 16:03 , Matthew Conway wrote:
If you need to tunnel jconsole to a remote cassandra instance, the
SSH socks proxy (ssh -D)is the easiest, least intrusive way. More
details:
http://simplygenius.com/2010/08/jconsole-via-socks-ssh-tunnel.html
Totally awesome. I've lost sev
yaw gmail.com> writes:
>
> Hi all, connecting to a cluster with cassandra-cli and trying a
> describe command,
> I obtain a "missing K_TABLE" message
> Is this a real issue?
I would chock this one up to a mix of user error and cryptic
CLI message.
describe command is describe keyspace
Could you explain this point further? Was there an exception?
On 09/01/2010 09:26 AM, Peter Fales wrote:
that doesn't quite work with the stock Cassandra, as it will
try to bind and listen on those addresses and give up because they
don't appear to be valid network addresses.
--
*Andres Marc
Riptano is going to be in Denver next Friday (Sept 10) for a full-day
Cassandra training (taught by yours truly). The training is broken
into two parts: the first covers application design and modeling in
Cassandra, with exercises using the Pycassa library; the second covers
operations, troublesho
The issue is this:
The IP address by which an EC2 instance is known _externally_ is not
actually on the instance itself (the address being translated), and
the _internal_ address is not accessible across regions. Since you
can't bind a specific address that is not on one of your local
interfaces,
I probably should have made it clear that I wasn't proposing this as
an official patch (as you point out, it's not general enough for
production use). I'm just looking for feedback on the concept (thanks!)
and thought it might possibly be useful to other folks trying to
do the same thing.
On W
On Wed, Sep 1, 2010 at 4:42 PM, Peter Fales
wrote:
> I probably should have made it clear that I wasn't proposing this as
> an official patch (as you point out, it's not general enough for
> production use). I'm just looking for feedback on the concept (thanks!)
> and thought it might possibly b
Is it not possible to put the external host name in cassandra.yaml and
add a host entry in /etc/hosts for that name to resolve to the local
interface?
On 09/01/2010 01:24 PM, Benjamin Black wrote:
The issue is this:
The IP address by which an EC2 instance is known _externally_ is not
actuall
It's not gossiping hostnames, it's gossiping IP addresses. The
purpose of Peter's patch is to have the system gossip its external
address (so other nodes can connect), but bind its internal address.
As Edward notes, it helps with NAT in general, not just EC2. Not
perfect, but a great start.
b
+1
On Wed, Sep 1, 2010 at 1:24 PM, Benjamin Black wrote:
> The issue is this:
>
> The IP address by which an EC2 instance is known _externally_ is not
> actually on the instance itself (the address being translated), and
> the _internal_ address is not accessible across regions. Since you
> can'
I thought you might say that. Is there some reason to gossip IP
addresses vs hostnames? I thought that layer of indirection could be
useful in more than just this use case.
I still think it is a good idea to have a separate bind vs gossip config
param.
On 09/01/2010 03:10 PM, Benjamin Bla
On Wed, Sep 1, 2010 at 3:18 PM, Andres March wrote:
> I thought you might say that. Is there some reason to gossip IP addresses
> vs hostnames? I thought that layer of indirection could be useful in more
> than just this use case.
>
The trade-off for that flexibility is that nodes are now depen
On Sep 1, 2010, at 1:42 PM, Peter Fales wrote:
> I probably should have made it clear that I wasn't proposing this as
> an official patch (as you point out, it's not general enough for
> production use). I'm just looking for feedback on the concept (thanks!)
> and thought it might possibly be
I didn't have anything specific in mind. I understand all the issues
around DNS and not advocating only supporting hostnames (just thought it
would be a nice option). I also wouldn't expect name resolution to be
done all the time, only when the node is first being started or during
initial di
On Wed, Sep 1, 2010 at 4:16 PM, Andres March wrote:
> I didn't have anything specific in mind. I understand all the issues around
> DNS and not advocating only supporting hostnames (just thought it would be a
> nice option). I also wouldn't expect name resolution to be done all the
> time, only w
Hi,
Just a curiosity. I should probably read some code and write a test to make
sure, but not important enough right now for that :)
-
void batch_mutate(string keyspace,
map>> mutation_map, ConsistencyLevel
consistency_level)
Will performance of a batch_mutate be affected by the order of
no
On Wed, Sep 1, 2010 at 7:34 PM, Terje Marthinussen
wrote:
> Hi,
>
> Just a curiosity. I should probably read some code and write a test to make
> sure, but not important enough right now for that :)
>
> void batch_mutate(string keyspace, map>> mutation_map, ConsistencyLevel consistency_level)
Hi Jonathan
Any plans of coming to India in future ?
___
Regards
Vineet Daniel
+918106217121
___
Let your email find you
On Thu, Sep 2, 2010 at 1:52 AM, Jonathan Ellis wrote:
> Riptano is going to be in Denver next F
It will be gr8.
Samal Gorai
On Thu, Sep 2, 2010 at 10:46 AM, vineet daniel wrote:
> Hi Jonathan
>
> Any plans of coming to India in future ?
>
> ___
> Regards
> Vineet Daniel
> +918106217121
> ___
>
> Let your email find you
Hi all,
I run a benchmark with my own code and found that the 10 inserts
performance is better than others, Why?
Can anyone explain it?
Thanks.
Partitioner = OPP
CL = ONE
==
1000 records
insert one:201 ms
insert per:0.201 ms
insert thput:4975.12
Hi Ching
You are inserting using php,perl,python,java or ? and is cassandra installed
locally or on a network system and is it a single system or you have a
cluster of nodes. I know I've asked you many questions but the answers will
help immensely to assess the results.
Anyways congrats on gettin
Hi Daniel,
I have 4 nodes in my cluster, and run a benchmark on node A in Java.
P.S. Replication = 3
Shen
On Thu, Sep 2, 2010 at 2:49 PM, vineet daniel wrote:
> Hi Ching
>
> You are inserting using php,perl,python,java or ? and is cassandra
> installed locally or on a network system and is
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