http://pixs.ru/showimage/17jpg_9670866_1622744.jpg
What is the type of a Row Key? Can you define how they are compared?
I ask because I'm using TimeUUIDs as my row keys, but when I make a
call to get a range of row keys (get_range in phpcassa) I have to
specify the UTF8 range of '' to '----'
instead of the TimeUUID
Is there a way to query for column names or super column names without
also pulling down the data they contain? (Besides keeping a second
index) I don't see an obvious way to do it from the Thrift API, but
maybe I'm missing something.
Thanks!
-Jeremiah
Jeremiah
Hey,
I am currently investigating Cassandra for storing what are
effectively web sessions. Our production environment has about 10 high
end servers behind a load balancer, and we'd like to add distributed
session support. My main concerns are performance, consistency, and
the ability to create
I asked this on the hector list last week. Its possible but remember, each
row can have a different set of associated columns.
On 1 Feb 2011 18:16, Jeremiah Jordan jeremiah.jor...@morningstar.com
wrote:
Is there a way to query for column names or super column names without
also pulling down the
Please do keep this discussion on the mailing list and not take it offline.
:-)
I will be in the same boat very soon, I think.
It will be great to hear from people who have already gone down this road
and used Cassandra as a session store in a clustered environment.
On Tue, Feb 1, 2011 at 10:56
Are you going to use TTLs to expire the session columns automagically? (we're
working on something similar as well)
On 2/1/11 12:30 PM, Roshan Dawrani roshandawr...@gmail.com wrote:
Please do keep this discussion on the mailing list and not take it offline. :-)
I will be in the same boat very
Most if not all modern web application frameworks support sessions. This
applies to Django (with which I have most experience and also run it with
X.509 security layer) but also to Ruby on Rails and Pylons.
So, why would you re-invent the wheel? Too messy. It's all out there for you
to use.
The problem is where to store the session data. If the session need to be
accessible by more than one web servers, the external storage is needed.
Cassandra only supports eventual consistency. If web server w1 saves the
session at node 1 of cassendra while web server w2 retrieve the session
We're using servlets which also support sessions, but you have to rely
on the servlet container to offer any sort of distributed session
handling and this produces scalability issues past a certain point.
Same thing for persistent sessions (survive restart). We also want a
mechanism that can
Is there anyone working with current chef recipes for Cassandra?
For completeness:
http://stackoverflow.com/questions/3746685/running-django-site-in-multiserver-environment-how-to-handle-sessions
http://docs.djangoproject.com/en/dev/topics/http/sessions/#using-cached-sessions
I guess your approach does make sense, one only wishes that the servlet in
question
Not a concern - and here is why:-
From the wiki arch section captioned below - eventual consistency does not
have to mean inconsistent reads. The concern is the overhead for consistent
reads. But remember in the use case being cited, the expensive read will
happen only during failover, not all
FWIW we used Memcached for session data at Digg without any major issues. The
one thing we did end up doing to reduce the LRU on sessions was to modify the
slab size and put sessions in their own Memcached cluster. Probably not an
issue for you though.
+1 on Memcached.
On Feb 1, 2011, at
In my scenario all i need is simple session management. That's all. Quick
and useful for what i need. Why i'm creating a wheel...
On 1 Feb 2011 18:42, buddhasystem potek...@bnl.gov wrote:
Most if not all modern web application frameworks support sessions. This
applies to Django (with which I
On Tue, Feb 1, 2011 at 12:57 PM, Anthony John chirayit...@gmail.com wrote:
Not a concern - and here is why:-
From the wiki arch section captioned below - eventual consistency does not
have to mean inconsistent reads. The concern is the overhead for consistent
reads. But remember in the use
If it is a really session data, which will be active for a short time, a few
hours, and it is OK to lose them, memcached is a better solution. I were using
it when I was in Yahoo.
Tong
-Original Message-
From: buddhasystem [mailto:potek...@bnl.gov]
Sent: Tuesday, February 01, 2011 9:57
Wouldn't something like Redis be a better fit than Cassandra?
On Tue, Feb 1, 2011 at 6:16 PM, Tong Zhu tong@rms.com wrote:
If it is a really session data, which will be active for a short time, a few
hours, and it is OK to lose them, memcached is a better solution. I were
using it when I
Hmm, looking at redis now. The built in time to live functionality
would be nice to have..
On Tue, Feb 1, 2011 at 1:34 PM, Colin Vipurs zodiac...@gmail.com wrote:
Wouldn't something like Redis be a better fit than Cassandra?
On Tue, Feb 1, 2011 at 6:16 PM, Tong Zhu tong@rms.com wrote:
If
I'm running Cassandra 0.7 and I'm trying to get Pig integration to work
correctly. I'm using Pig 0.8 running against Hadoop 20.2, I've also tried this
running against CDH2.
I can log into the grunt shell, and execute scripts, but when they run, they
don't read all of the data from Cassandra.
Version: Cassandra 0.7.1 (build from trunk)
Setup:
- Cluster of 2 nodes (Say A and B)
- HH enabled
- Using the default Keyspace definition in cassandra.yaml
- Using SuperCounter1 CF
Client:
- Using CL of ONE
I started the two Cassandra nodes, created schema and then shutdown one of
the
Version: Cassandra 0.7.1 (build from trunk)
Setup:
- Cluster of 2 nodes (Say A and B)
- HH enabled
- Using the default Keyspace definition in cassandra.yaml
- Using SuperCounter1 CF
Steps:
- Started the two nodes, loaded schema using nodetool
- Executed counter update and read operations on A
How they are compared depends on the partitioner you are using. For
BOP, it is lexical by byte order.
On Tue, Feb 1, 2011 at 8:47 AM, Bill Speirs bill.spe...@gmail.com wrote:
What is the type of a Row Key? Can you define how they are compared?
I ask because I'm using TimeUUIDs as my row keys,
Reddis seems neat, but a couple issues:
- It's 'persistence' is more of a timed backup. You are not guaranteed
the latest results on disk.
- no real 'clustering'. It has a master/slave system.
Hard to say if those are deal breakers at this point, but the API for
it seems nice.
On Tue, Feb 1,
nvm on the persistence, it seems like it does support it:
'Since version 1.1 the safer alternative is an append-only file (a
journal) that is written as operations modifying the dataset in memory
are processed. Redis is able to rewrite the append-only file in the
background in order to avoid an
What I'm still unclear about, and where I think this is suitable, is
Cassandra being used as a data warehouse for current and past sessions tied
to a user. Yes, other things are great for session management, but I want
to provide near real time session information to my users ... quick and
simple
I think the problem here is your test.
The CassandraServer class calls validateColumns() and will not let zero length
columns be inserted. The call would not get to the storage proxy.
Aaron
On 2/02/2011, at 2:27 AM, Mikael Wikblom mikael.wikb...@sitevision.se wrote:
Hi,
I'm getting an
If your sessions are fairly long-lived (more like hours instead of minutes) and
you crank up a suitable row cache and make sure your db is consistent (via
quorum read/writes or write:all, read:1) - sure, why not? Especially if you're
already familiar with Cassandra; possibly even have a
Not that I know of.
Aaron
On 2/02/2011, at 6:21 AM, Sasha Dolgy sdo...@gmail.com wrote:
I asked this on the hector list last week. Its possible but remember, each
row can have a different set of associated columns.
On 1 Feb 2011 18:16, Jeremiah Jordan jeremiah.jor...@morningstar.com
I'm still very new to Cassandra, but when I started reading about it the first
thing I thought about was a session store. It's based (in part from what I
understand) on Dynamo which is (again, I could be wrong) used at Amazon as the
session store for your shopping cart.
So I would certainly
Counters are not yet supported in sstable2json.
(More generally, trunk is not expected to be stable at this point in
the development cycle.)
On Tue, Feb 1, 2011 at 11:32 AM, Narendra Sharma
narendra.sha...@gmail.com wrote:
Version: Cassandra 0.7.1 (build from trunk)
Setup:
- Cluster of 2
Cassandra column families are schema-less and like SQL tables, they don't
have a fixed number of columns per row. In the same column family, one row
may have 5 columns, and another row, 10,000 columns. Every row can possibly
have a different number / set of columns.
are you saying the above is
Begin forwarded message:
From: Viraj Bhat vi...@yahoo-inc.com
Date: February 1, 2011 1:02:23 PM PST
To: pig-u...@hadoop.apache.org pig-u...@hadoop.apache.org,
mapreduce-u...@hadoop.apache.org mapreduce-u...@hadoop.apache.org,
mapreduce-...@hadoop.apache.org
Not at all.The question was about retrieving the column name without the column value. That is not possible.AaronOn 02 Feb, 2011,at 10:27 AM, Sasha Dolgy sdo...@gmail.com wrote:"Cassandra column families are schema-less and like SQL tables, they don't have a fixed number of columns per row. In the
ah i see ... apologies for the extra bytes
On Tue, Feb 1, 2011 at 10:38 PM, Aaron Morton aa...@thelastpickle.comwrote:
Not at all.
The question was about retrieving the column name without the column value.
That is not possible.
Aaron
2011/2/1 Jonathan Ellis jbel...@gmail.com:
It is initialized after processing Thrift connections
More generally, various MBeans become available at different parts of
the startup process. If, just after startup, one that should be
there is missing, most of the time you probably just have to wait
Hi Joe,
On 02/02/2011 02:58 AM, Joe Stump wrote:
FWIW we used Memcached for session data at Digg without any major issues. The
one thing we did end up doing to reduce the LRU on sessions was to modify the
slab size and put sessions in their own Memcached cluster. Probably not an
issue for
I have posted on Hector ML:
http://thread.gmane.org/gmane.comp.db.hector.user/1690
Oleg
Sent from my iPad
Hi,
I am trying to run CQL from a java client and facing one issue. Keyspace is
passed as null. When I execute Use Keyspace1 followed by my Select query it
is still not working.
Any suggestion will be a great help.
Regards,
Vivek Mishra
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