Unfortunately, the previous AMI we used to provision the 7.5 version is no
longer available. More unfortunately, the two test nodes we spun up in each
AZ did not get Nehalem architectures so the only things I can say for
certain after running Mike's test 10x on each test node are:
1) I could not
The ConsistenyLevel is passed with each read and write command.
How you set it will depend on the client you are using. Which one are you using
?
Aaron
On 17/01/2011, at 8:50 PM, raoyixuan (Shandy) wrote:
How to set the consistency level in Cassandra 0.7? I mean what command?
Both hector and cassandra-cli . Can you tell me respectively? Thanks a lot.
From: aaron morton [mailto:aa...@thelastpickle.com]
Sent: Monday, January 17, 2011 4:17 PM
To: user@cassandra.apache.org
Subject: Re: about the consistency level
The ConsistenyLevel is passed with each read and write
The cassandra-clie works as CL.ONE , currently it cannot be changed. I'm not
sure if there is a reason for this, but if it's a feature you would like add a
request to JIRA https://issues.apache.org/jira/browse/CASSANDRA
In Hector it's part of the m.p.h.api.Keyspace interface as
Thanks a lot.
From: aaron morton [mailto:aa...@thelastpickle.com]
Sent: Monday, January 17, 2011 5:01 PM
To: user@cassandra.apache.org
Subject: Re: about the consistency level
The cassandra-clie works as CL.ONE , currently it cannot be changed. I'm not
sure if there is a reason for this, but if
What is the best way to model a query with between clause.. given that you have
a large number of entries...
thanks
Jo
Can you provide some more information ?
Aaron
On 17/01/2011, at 11:55 PM, kh jo wrote:
What is the best way to model a query with between clause.. given that you
have a large number of entries...
thanks
Jo
On 17/01/2011 11:55, kh jo wrote:
What is the best way to model a query with between clause.. given that
you have a large number of entries...
thanks
Jo
In my experience,for the row based 'between clause' with a random
partition, you should design the column family carefully, So that you
another example:Â generating visit statistics given that start and end date are
dynamic
--- On Mon, 1/17/11, kh jo jo80la...@yahoo.com wrote:
From: kh jo jo80la...@yahoo.com
Subject: Re: Between Clause
To: user@cassandra.apache.org
Date: Monday, January 17, 2011, 12:40 PM
example: finding
On Mon, Jan 17, 2011 at 2:44 AM, aaron morton aa...@thelastpickle.com wrote:
The nodes will not automatically delete stale data, to do that you need to
run nodetool cleanup.
See step 3 in the Range Changes Bootstrap
http://wiki.apache.org/cassandra/Operations#Range_changes
If you are
https://issues.apache.org/jira/browse/CASSANDRA-1997
On 16 January 2011 19:59, Stephen Connolly
stephen.alan.conno...@gmail.com wrote:
it will be an attachment to an as yet un raised jira. look out for it
tomorrow/tuesday
- Stephen
---
Sent from my Android phone, so random spelling
Dear List
I found a strange behavior on our mini cluster during update with
consistency level quorum.
We have a cluster with 4 nodes. ReplicationFactor is 2, ReplicaPlacment
is the RackAwareStrategy and the EndpointSnitch is the
PropertyFileEndpointSnitch (with two data center and two racks
On Mon, Jan 17, 2011 at 10:51 AM, Peter Schuller
peter.schul...@infidyne.com wrote:
Just to head the next possible problem. If you run 'nodetool cleanup'
on each node and some of your nodes still have more data then others,
then it probably means your are writing the majority of data to a few
On Mon, Jan 17, 2011 at 9:55 AM, Samuel Benz samuel.b...@switch.ch wrote:
We have a cluster with 4 nodes. ReplicationFactor is 2, ReplicaPlacment
is the RackAwareStrategy and the EndpointSnitch is the
PropertyFileEndpointSnitch (with two data center and two racks each).
My understanding is,
I am having some reliability problems in my Cassandra cluster which I am
almost certain is due to GC. I was about to start delving into the guts of
the problem by turning on GC logging but I have never done any serious java
GC tuning before (time to learn I guess). As a first step however, I was
@Peter Isn't clean up a special case of compaction? IE it works as a
major compaction + removes data not belonging to the node?
Yes, sorry. Brain lapse. Ignore my.
--
/ Peter Schuller
Dan,
Please kindly attach your:
1) java -version
2) full commandline settings, heap sizes.
3) gc log from one of the nodes via:
-XX:+PrintTenuringDistribution \
-XX:+PrintGCDetails \
-XX:+PrintGCTimeStamps \
-Xloggc:/var/log/cassandra/gc.log \
4) number of cores on your system. How busy is the
very quickly from the young generation to the old generation. Furthermore,
the CMSInitiatingOccupancyFraction of 75 (from a JVM default of 68) means
start gc in the old generation later, presumably to allow Cassandra to use
more of the old generation heap without needlessly trying to free up
On 01/17/11 15:54, Edward Capriolo wrote:
Just to head the next possible problem. If you run 'nodetool cleanup'
on each node and some of your nodes still have more data then others,
then it probably means your are writing the majority of data to a few
keys. ( you probably do not want to do
On Mon, Jan 17, 2011 at 1:20 PM, Karl Hiramoto k...@hiramoto.org wrote:
On 01/17/11 15:54, Edward Capriolo wrote:
Just to head the next possible problem. If you run 'nodetool cleanup'
on each node and some of your nodes still have more data then others,
then it probably means your are writing
Adding CL.TWO would be easy enough. :)
On Mon, Jan 17, 2011 at 12:12 PM, Peter Schuller
peter.schul...@infidyne.com wrote:
I think you should just tell everybody that if you want to use QUORUM you
need RF = 3 for it to be meaningful.
No one would use QUORUM with RF 3 except in error.
Well,
Adding CL.TWO would be easy enough. :)
True, but the obvious generalization is to be able to select an
arbitrary replica count and that seemed like a bigger change to the
API. But if CL.TWO would be considered clean enough... I may submit a
jira/patch.
--
/ Peter Schuller
How can I best map an object containing two maps, one of which is updated very
frequently and the other only occasionally?
a) As one super CF, which each map in a separate supercolumn and the map
entries being the subcolumns?
b) As two CFs, one for each map.
I'd like to discuss the why behind
Have you added a Jira for this? Or does anyone else want or not want this
feature ?
I'll try to add it as practice.
Aaron
On 17/01/2011, at 10:15 PM, raoyixuan (Shandy) raoyix...@huawei.com wrote:
Thanks a lot.
From: aaron morton [mailto:aa...@thelastpickle.com]
Sent: Monday, January 17,
On Mon, Jan 17, 2011 at 2:10 PM, Samuel Benz samuel.b...@switch.ch wrote:
Case1:
If 'TEST' was previous stored on Node1, Node2, Node3 - The update will
succeed.
Case2:
If 'TEST' was previous stored on Node2, Node3, Node4 - The update will
not work.
If you have RF=2 then it will be stored
Thanks for all the info, I think I have been able to sort out my issue. The
new settings I am using are:
-Xmn512M (Very important I think)
-XX:SurvivorRatio=5 (Not very important I think)
-XX:MaxTenuringThreshold=5
-XX:ParallelGCThreads=8
-XX:CMSInitiatingOccupancyFraction=75
Since applying
Java + Pelops
On Sat, Jan 15, 2011 at 10:58 PM, Dave Viner davevi...@gmail.com wrote:
Perl using the thrift interface directly.
On Sat, Jan 15, 2011 at 6:10 AM, Daniel Lundin d...@eintr.org wrote:
python + pycassa
scala + Hector
On Fri, Jan 14, 2011 at 6:24 PM, Ertio Lew ertio...@gmail.com
Thanks, Dan:
Yes, -Xmn512MB/1G sizes the Young Generation explicitly and removes the
adaptive resizing out of the picture. (If at all possible send your gc log
over we can analyze the promotion failure a little bit more finely.)
The low load implies that that you are able to use the parallel
Now, a full stop of the application was what I was seeing extensively before
(100-200 times over the course of a major compaction as reported by
gossipers on other nodes). I have also just noticed that the previous
instability (ie application stops) correlated with the compaction of a few
Sure, consider stock data, where the stock symbol is the row key. The stock
data consists of a rather stable part and a very volatile part, both of which
would be a super column. The stable super column would contain subcolumns such
as company name, address, and some annual or quarterly data.
On 17 January 2011 22:36, Steven Mac ugs...@hotmail.com wrote:
Sure, consider stock data, where the stock symbol is the row key. The stock
data consists of a rather stable part and a very volatile part, both of
which would be a super column. The stable super column would contain
subcolumns
I guess I was maybe trying to simplify the question too much. In reality I do
not have one volatile part, but multiple ones (say all trading data of day).
Each would be a supercolumn identified by the time slot, with the individual
fields as subcolumns.
Of course, I could prefix the time slot
On Mon, Jan 17, 2011 at 5:12 PM, Steven Mac ugs...@hotmail.com wrote:
I guess I was maybe trying to simplify the question too much. In reality I
do not have one volatile part, but multiple ones (say all trading data of
day). Each would be a supercolumn identified by the time slot, with the
Here's the method declaration for quick reference:
mapstring,listColumnOrSuperColumn multiget_slice(string keyspace,
liststring keys, ColumnParent column_parent, SlicePredicate predicate,
ConsistencyLevel consistency_level)
It looks like you must have the same SlicePredicate for every key in
If you can provide some more information on a specific use case we may be able to help with the modelling.The general approach is to denormalise the data to the point where each request/activity/feature in your application results in a call to get data from one or more rows in one CF. It's not
On Mon, Jan 17, 2011 at 7:22 PM, Ertio Lew ertio...@gmail.com wrote:
What would be the best client option to go with in order to use
Pycassa. https://github.com/thobbs/pycassa
Cassandra through an application to be implemented in PHP.
Oh. Then https://github.com/thobbs/phpcassa
Hey Brandon,
1. ) Is it devloped to the level in order to support all the
necessary features to take full advantage of Cassandra?
2. ) Is it used in production by anyone ?
3. ) What are its limitations?
Thanks.
On Tue, Jan 18, 2011 at 7:11 AM, Brandon Williams dri...@gmail.com wrote:
On
On 01/17/2011 09:28 PM, Jonathan Ellis wrote:
On Mon, Jan 17, 2011 at 2:10 PM, Samuel Benz samuel.b...@switch.ch wrote:
Case1:
If 'TEST' was previous stored on Node1, Node2, Node3 - The update will
succeed.
Case2:
If 'TEST' was previous stored on Node2, Node3, Node4 - The update will
not
On Sun, Jan 16, 2011 at 6:53 AM, David Boxenhorn da...@lookin2.com wrote:
If I delete a row, and later on delete it again, before GCGraceSeconds has
elapsed, does the tombstone live longer?
Each delete is a new tombstone, which should answer your question.
-ryan
In other words, if I have the
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