It's in a FAQ somewhere.
Based on this:
http://en.wikipedia.org/wiki/Cassandra
An oracle might also be called a prophet.
On Thu, Jul 8, 2010 at 9:43 PM, ChingShen wrote:
> Hi,
>
> Why is cassandra named cassandra?
>
> Thanks.
>
> Shen
>
it is explained in the video on the site ;)
Op 9/07/10 03:43, ChingShen schreef:
> Hi,
>
> Why is cassandra named cassandra?
>
> Thanks.
>
> Shen
Hi,
I am a bit confused about getting an UnavailableException when doing a QUORUM
write.
I have a 3 node cluster, with RF=3. When all 3 nodes are up, the QUORUM write
succeeds. When 1 of the 3 nodes are down, the QUORUM write fails with
UnavailableException. Shouldn't it be enough with 2 nodes
row size is 10 KB and write count on a node for a CF is 1054451,
so ideally the total disk space used on that node by that CF should be
around 10 GB
but it's showing 23 GB
what else might be taking up so much space?
Thanks
Which client library do you use?
Shen
On Fri, Jul 9, 2010 at 4:53 PM, Per Olesen wrote:
> Hi,
>
> I am a bit confused about getting an UnavailableException when doing a
> QUORUM write.
>
> I have a 3 node cluster, with RF=3. When all 3 nodes are up, the QUORUM
> write succeeds. When 1 of the 3
On Jul 9, 2010, at 11:11 AM, ChingShen wrote:
> Which client library do you use?
Direct on thrift api using thrift.jar, in version 917130.
Hi,
I am attempting to add a new node to a single node already running.
I have set the first node not to bootstrap, and the second node to
bootstrap whit the first node as it's seeder. The IP configuration is
OK, the machines can ping each other, the seed machine (or should I say
cassandra runnin
Solved it!
Sorry to spam your inbox!
BoriS
On Fri, 2010-07-09 at 11:50 +0200, Boris Spasojevic wrote:
> Hi,
>
> I am attempting to add a new node to a single node already running.
> I have set the first node not to bootstrap, and the second node to
> bootstrap whit the first node as it's seede
what does WriteCount signify actually, it should also include writes which
are replicas right? It is total no of writes on that node for that CFtill
now, right ?
On Fri, Jul 9, 2010 at 2:39 PM, Sagar Agrawal wrote:
> row size is 10 KB and write count on a node for a CF is 1054451,
> so ideally
Sounds like maybe your not binding the 7000 port to the correct interface,
maybe you have it set to localhost, rather then the IP address. If you want to
confirm, try prompt> telnet [machine ip] 7000
If you get a connection refused, then the above is true.
Hope this helps.
Dimitry Lvovsky
Dir
Hi,
I was reading http://wiki.apache.org/cassandra/FAQ#iter_world and decided to
implement the get_range_slices method for listing all keys of a CF. Only thing
is, it doesn't work that well for me :-)
I do as it says (I think), and take KeyRanges of size N and use the key of the
last call as s
I have a 2 node cluster
node1 - 5
node2 - 9
If I insert a row with key="a", which node should it go and why?
It is going to node1, but I think it should go to node2, since token value
of node is closer to "a" (using java string compareTo method)
someone please clarify
Thanks
see the beginning of http://wiki.apache.org/cassandra/Operations
On Fri, Jul 9, 2010 at 7:16 AM, Sagar Agrawal wrote:
> I have a 2 node cluster
> node1 - 5
> node2 - 9
>
> If I insert a row with key="a", which node should it go and why?
>
> It is going to node1, but I think it should go to node2,
Are you using OrderPreservingPartitioner or RandomPartitioner?
Cause if you are using RandomPartitioner, a hash is calculated from "a" and
that hash is used to determine where the data for "a" key goes, not "a".
On Jul 9, 2010, at 2:16 PM, Sagar Agrawal wrote:
> I have a 2 node cluster
> node1
http://twitter.com/nk/status/17903187277
Another "not using" joke?
My previous reply seemed to have bounced.
Will there be a training day before/after the Cassandr Summit? (in SF on the
10th)
On Fri, Jul 2, 2010 at 2:08 PM, Jonathan Ellis wrote:
> Riptano's one day Cassandra training is coming to NYC in August, our
> first public session on the East coast:
> h
got it, thanks
On Fri, Jul 9, 2010 at 6:21 PM, Per Olesen wrote:
> Are you using OrderPreservingPartitioner or RandomPartitioner?
>
> Cause if you are using RandomPartitioner, a hash is calculated from "a" and
> that hash is used to determine where the data for "a" key goes, not "a".
>
>
> On Ju
On Fri, Jul 2, 2010 at 1:08 PM, Jonathan Ellis wrote:
> Riptano's one day Cassandra training is coming to NYC in August, our
> first public session on the East coast:
> http://www.eventbrite.com/event/749518831
Is there a calendar where you're listing this stuff, or is it just
tweets and mail mes
Hi guys,
I am on the hook to explain why 30GB of data is filling up 106GB of disk space
since this is concerning information for my project.
We are very excited about the possibility of using Cassandra but need to
understand this anomaly in order to feel confident. Does anyone know why this
cou
Today is your last chance to submit a CFP abstract for the 2010 Surge
Scalability Conference. The event is taking place on Sept 30 and Oct 1,
2010 in Baltimore, MD. Surge focuses on case studies that address
production failures and the re-engineering efforts that led to victory
in Web Application
Cassandra has a very high constant per-row overhead at the moment of around 40
bytes. Additionally, there is around 12 bytes of overhead per column. Finally,
column names are repeated for each row.
CASSANDRA-674 and CASSANDRA-1207 will help with these overheads, but they will
not be fixed until
FYI: https://issues.apache.org/jira/browse/CASSANDRA-1145
Yes, it's a bug. CL.ONE is a reasonable work around.
On Thu, Jul 8, 2010 at 11:04 PM, Mike Malone wrote:
> I think the answer to your question is no, you shouldn't.
> I'm feeling far too lazy to do even light research on the topic, but I
>
Do you have a rough estimate as to when there might be a training day in
London (UK). I'm currently weighing up whether I should be making a journey
across the pond for one of the US-based events.
Thanks
Dave
On 9 July 2010 15:36, Jeremy Dunck wrote:
> On Fri, Jul 2, 2010 at 1:08 PM, Jonathan
I've submitted a contrib. (windows.zip) to the JIRA issue/ticket
https://issues.apache.org/jira/browse/CASSANDRA-292.
The zip contains everything needed to run Cassandra as a Windows Service. It
should be unzipped under the contrib directory. It includes an Ant build script
and unit test. I'v
Are there any known performance issues if cassandra cluster launched with
RackAwareStrategy because I see huge performance difference between
RackAwareStrategy vs RackUnAwareStrategy. Here are details:
we have a cluster setup with 4 EC2 X large nodes, 3 of them are running in East
region an
Hi,
Can you post the stress test code and storage.conf used?
I have a cluster in EC2 using RackAware. However, I am in 1 region
(us-east-1) but 2 Availability Zones. Amazon helps to ensure that AZ's are
isolated from each other creating a fail-resistant cluster. But, staying in
the same region
We had similar issues when we started running Cassandra on EC2 between multiple
AZ's (not regions; we're working up to that shortly). We ended up building a
rack aware strategy specific to AWS, which is posted somewhere in JIRA.
Basically it uses the AWS API to ensure that replicants are stored
east: A B C
west: D
Perhaps you are blocking on a write to D - what's your quorum/rf set up
as?
Bill
On Fri, 2010-07-09 at 10:36 -0700, maneela a wrote:
> Are there any known performance issues if cassandra cluster
> launched with RackAwareStrategy because I see huge perfo
my keys are sequential integers and i use random partitioner in a multi-node
cluster. In this case, do I still have to specify initialToken?
thanks,
claire
then obsolete sstables is not your culprit.
On Thu, Jul 8, 2010 at 8:32 AM, Julie wrote:
> Jonathan Ellis gmail.com> writes:
>
>> "SSTables that are obsoleted by a compaction are deleted
>> asynchronously when the JVM performs a GC. You can force a GC from
>> jconsole if necessary, but Cassandra
there's some support for this in 0.7 (see
http://issues.apache.org/jira/browse/CASSANDRA-1018) but fundamentally
it's not really designed to be started and stopped multiple times
within the same process.
On Thu, Jul 8, 2010 at 3:44 AM, Andriy Kopachevsky
wrote:
> Hi, we are trying to set up inter
typically you will update both as part of a batch_mutate, and if it
fails, retry the operation. re-writing any part that succeeded will
be harmless.
On Thu, Jul 8, 2010 at 11:13 AM, Stuart Langridge
wrote:
> Hi, Cassandra people!
>
> We're looking at Cassandra as a possible replacement for some
this sounds like a bug, although if you've attempted any node movement
or bootstrapping, that could cause the required quorum to be larger
than just the number of nodes.
On Fri, Jul 9, 2010 at 3:53 AM, Per Olesen wrote:
> Hi,
>
> I am a bit confused about getting an UnavailableException when doin
you should read the "cassandra disk space utilization" thread.
On Fri, Jul 9, 2010 at 4:09 AM, Sagar Agrawal wrote:
> row size is 10 KB and write count on a node for a CF is 1054451,
> so ideally the total disk space used on that node by that CF should be
> around 10 GB
> but it's showing 23 GB
Short answer: yes.
Longer answer: http://wiki.apache.org/cassandra/Operations
On Fri, Jul 9, 2010 at 1:19 PM, Claire Chang wrote:
> my keys are sequential integers and i use random partitioner in a multi-node
> cluster. In this case, do I still have to specify initialToken?
>
> thanks,
> claire
Thanks for your quick reply.. JoeI forgot to mentioned that we are
using PropertyFileEndPointSnitch to provide cassandra about our network
topology and below is property file uses by that class
cat
rack.properties10.9.0.6=east:r1b10.9.0.18=east:r1c10.9.0.14=east:r1d10.9.0.10=west:r1adefault=east
The workaround I do is fork always. Each test pulls up its own jvm.
On Jul 9, 2010 9:51 PM, "Jonathan Ellis" wrote:
there's some support for this in 0.7 (see
http://issues.apache.org/jira/browse/CASSANDRA-1018) but fundamentally
it's not really designed to be started and stopped multiple times
w
ConsistencyLevel.ONE is default option given inside stress.py so I am using
default one
--- On Fri, 7/9/10, Bill de hÓra wrote:
From: Bill de hÓra
Subject: Re: RackAwareStrategy vs RackUnAwareStrategy on AWS EC2 cloud
To: user@cassandra.apache.org
Date: Friday, July 9, 2010, 2:12 PM
east:
On Jul 9, 2010, at 1:16 PM, maneela a wrote:
> Is there any way to mark cassandra node to keep it as just for replication
> purpose and not to be as Primary for any data range in the ring?
I believe there is. This is what we're doing, but we do all of our writes via a
queue. Derek or Mike fro
A good read.
http://techcrunch.com/2010/07/09/twitter-analytics-mysql/
Todd
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