Hi!
I am a newbie to Cassandra and seeking some advice regarding the data model I
should use to best address my needs.
For simplicity, what I want to accomplish is:
I have a system that has users (potentially ~10,000 per day) and they perform
actions in the system (total of ~50,000 a day).
Each
On 19.01.2012, at 20:15, Narendra Sharma wrote:
I believe you need to move the nodes on the ring. What was the load on the
nodes before you added 5 new nodes? Its just that you are getting data in
certain token range more than others.
With three nodes, it was also imbalanced.
What I don't
Hi,
I am experiencing a delay in delete operations in cassandra. Its as
follows. I am running a thread which contains following three steps.
Step 01: Read data from column family foo[1]
Step 02: Process received data eg: bar1,bar2,bar3,bar4,bar5
Step 03: Remove those processed data from
Thanks for this very helpful info. It is indeed a production site which I
cannot easily upgrade. I will try the various gc knobs and post any positive
results.
-Original Message-
From: sc...@scode.org [mailto:sc...@scode.org] On Behalf Of Peter Schuller
Sent: vrijdag 20 januari 2012
Thanks for all the responses!
I found our problem:
Using the Random Partitioner, the key range is from 0..2**127.When we added
nodes, we generated the keys and out of convenience, we added an offset to the
tokens because the move was easier like that.
However, we did not execute the modulo
I'm storing very large versioned lists of names, and I'd like to
query a range of names within a given range of versions, which is a two
dimensional slice, in a single query. This is easy to do using
ByteOrderedPartitioner, but seems to require multiple (non parallel)
queries and extra CFs when
I can't remember if I asked this question before, but
We're using Cassandra as our transactional system, and building up quite a
library of map/reduce jobs that perform data quality analysis, statistics,
etc.
( 100 jobs now)
But... we are still struggling to provide an ad-hoc query mechanism
Thanks for this very helpful info. It is indeed a production site which I
cannot easily upgrade. I will try the various gc knobs and post any positive
results.
*IF* your data size, or at least hot set, is small enough that you're
not extremely reliant on the current size of page cache, and
The problem occurs when this thread is invoked for the second time.
In that step , it returns some of data that i already deleted in the third
step of the previous cycle.
In order to get a guarantee about a subsequent read seeing a write,
you must read and write at QUORUM (or LOCAL_QUORUM if
How much data do you think you will need ad hoc query ability for?
On Fri, Jan 20, 2012 at 11:28 AM, Brian O'Neill b...@alumni.brown.eduwrote:
I can't remember if I asked this question before, but
We're using Cassandra as our transactional system, and building up quite a
library of
Not terribly large
~50 million rows, each row has ~100-300 columns.
But big enough that a map/reduce job takes longer than users would like.
Actually maybe that is another question...
Does anyone have any benchmarks running map/reduce against Cassandra?
(even a simple count / or copy CF
Interesting articles... (changing the subject line to broaden the scope)
http://codemonkeyism.com/dark-side-nosql/
http://www.reportsanywhere.com/pebble/2010/04/16/127143774.html
These articulate the exact challenge we're trying to overcome.
-brian
On Fri, Jan 20, 2012 at 12:57 PM, Brian
Hello,
I am trying to use internode encryption in Cassandra (1.0.6) for the first time.
1. Followed the steps 1 to 5 at
http://download.oracle.com/javase/6/docs/technotes/guides/security/jsse/JSSERefGuide.html#CreateKeystore
Q. In cassandra.yaml , what value goes for keystore ? I exported the
Anyone know if there is any activity to deliver triggers?
I saw this quote:
http://www.readwriteweb.com/cloud/2011/10/cassandra-reaches-10-whats-nex.php
Ellis says that he's just starting to think about the post-1.0 world for
Cassandra. Two features do come to mind, though, that missed the boat
I had the following writeup when i did the KS and TS creation... Hope this
helps
*Step 1:* Download your Organisation Cert/Cert Chain/Generate one.
*Step 2:* Login to any of one machine do the following to create p12
# openssl pkcs12 -export -in cassandra-app.cert -inkey cassandra-app.key
Did you run repairs withing GC_GRACE all the time?
On 1/20/2012 3:42 AM, Shammi Jayasinghe wrote:
Hi,
I am experiencing a delay in delete operations in cassandra. Its as
follows. I am running a thread which contains following three steps.
Step 01: Read data from column family foo[1]
What makes you think that RDBMS will give you acceptable performance?
I guess you will try to index it to death (because otherwise the ad
hoc queries won't work well if at all), and at this point you may be
hit with a performance penalty.
It may be a good idea to interview users and build
I think the problem stems when you have data in a column that you need
to run adhoc query on which is not denormalized. In most cases it's
difficult to predict the type of query that would be required.
Another way of solving this could be to index the fields in search engine.
On Fri, Jan 20,
I certainly agree with difficult to predict. There is a Danish
proverb, which goes it's difficult to make predictions, especially
about the future.
My point was that it's equally difficult with noSQL and RDBMS.
The latter requires indexing to operate well, and that's a potential
performance
You can also scale not horizontally but diagonally,
i.e. raid SSDs and have multicore CPUs. This means that
you'll have same performance with less nodes, making
it far easier to manage.
SSDs by themselves will give you an order of magnitude
improvement on I/O.
On 1/19/2012 9:17 PM, Thorsten
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