Samal,
Thanks buddy for interpreting. Now suppose i am inserting data in a column
family using this data model dynamically, as a result columnNames will be
dynamic. Now consider there is a entry for *employee1* *name*d "Smith", and
i want to retrieve that value?
Regards,
Abhijit
On Thu, May 17,
It is like using your super column inside columns name.
empKey{
employee1+name:XX,
employee1+addr:X,
employee2+name:X,
employee2+addr:X
}
Here all of your employee details are attached to one domain i.e. all of
employee1 details will be *"employee1+[anytihng.n numb
> What is the the benefit of having more memory ? I mean, I don't
> understand why having 1, 2, 4, 8 or 16 GB of memory is so different.
Less frequent and less aggressive garbage collection frees up CPU resources to
run the database.
Less memory results in frequent and aggressive (i.e. stop the
Aaron,
Actually Aaron i am looking for a scenario on super columns being replaced
by composite column.
Say this is a data model using super column
rowKey{
superKey1 {
Name,
Address,
City,.
> The read rate that I have been seeing is about 3MB/sec, and that is reading
> the raw bytes... using string serializer the rate is even lower, about
> 2.2MB/sec.
Can we break this down a bit:
Is this a single client ?
How many columns is it asking for ?
What sort of query are you sending, s
Thanks Aaron. will do!
On Mon, May 14, 2012 at 1:14 PM, aaron morton wrote:
> Are you using framed transport on the client side ?
>
> Try the Hector user list for hector specific help
> https://groups.google.com/forum/?fromgroups#!searchin/hector-users
>
> Cheers
>
> -
> Aaron Mor
Hi Aaron T., No, actually we haven't, but this sounds like a good
suggestion. I can definitely try THIS before jumping into other things
such as enabling row cache etc. Thanks!
-- Y.
On Wed, May 16, 2012 at 9:38 PM, Aaron Turner wrote:
> On Wed, May 16, 2012 at 12:59 PM, Yiming Sun wrote:
>
On Wed, May 16, 2012 at 12:59 PM, Yiming Sun wrote:
> Hello,
>
> I asked the question as a follow-up under a different thread, so I figure I
> should ask here instead in case the other one gets buried, and besides, I
> have a little more information.
>
> "We find the lack of performance disturbing
On Tue, Apr 24, 2012 at 3:24 PM, Bill Au wrote:
> Everything went smoothly until I ran the last step, which is to run nodetool
> repair on all the nodes in the new data center. Repair is hanging on all
> the new nodes. I had to hit control-C to break out of it.
> [ snip ]
> Did I missed anything
On Tue, Apr 24, 2012 at 12:56 PM, Matthias Pfau wrote:
> we just noticed that cassandra is currently published with inconsistent
> dependencies. The inconsistencies exist between the published pom and the
> published distribution (tar.gz). I compared hashes of the libs of several
> versions and th
Daning,
You could
clear the hintedhandoff via jmx (
HintedHandOffManagerMBean.deleteHintsForEndpoint ) for that host.
Feng Qu
>
> From: Daning Wang
>To: user@cassandra.apache.org
>Sent: Wednesday, May 16, 2012 10:38 AM
>Subject: Re: Couldn't find cfId
>
>
Does anyone know when 1.1.1 will be released?
Thanks.
On Tue, May 15, 2012 at 5:40 PM, Brandon Williams wrote:
> Probably https://issues.apache.org/jira/browse/CASSANDRA-4230
>
> On Tue, May 15, 2012 at 4:08 PM, Bryan Fernandez
> wrote:
> > Greetings,
> >
> > We recently upgraded from 1.0.8 to
I upgraded to 1.0.6 to 1.1.0, and I noticed the effective ownership report
changed.
I have a 3-node cluster, with evenly divided tokens and RF=2. The node tool
report on 1.0.6 was:
33.33% 0
33.33% 56713727820156410577229101238628035243
33.33%
Will do, Oleg. Again, thanks for the information.
-- Y.
On Wed, May 16, 2012 at 4:44 PM, Oleg Dulin wrote:
> **
>
> Please do keep us posted. We have a somewhat similar Cassandra utilization
> pattern, and I would like to know what your solution is...
>
>
>
> On 2012-05-16 20:38:37 +, Yimi
Please do keep us posted. We have a somewhat similar Cassandra
utilization pattern, and I would like to know what your solution is...
On 2012-05-16 20:38:37 +, Yiming Sun said:
Thanks Oleg. Another caveat from our side is, we have a very large
data space (imaging picking 100 items out of
Thanks Oleg. Another caveat from our side is, we have a very large data
space (imaging picking 100 items out of 3 million, the chance of having 2
items from the same bin is pretty low). We will experiment with row cache,
and hopefully it will help, not the opposite (the tuning guide says row
cache
Indeed. This is how we are trying to solve this problem.
Our application has a built-in cache that resembles a supercolumn or
standardcolumn data structure and has API that resembles a combination
of Pelops selector and mutator. You can do something like that for
Hector.
The cache is constra
Ah, never thought I would be quoting Luke's "No, that's not true... that's
impossible~~" here... sigh.
But seriously, thanks Mike. Instead of using memcached, would it help to
turn on row cache?
An even more philosophical question: what would be a better choice for
read-heavy loads? a major p
Hi Yiming,
Cassandra is optimized for write-heavy environments.
If you have a read-heavy application, you shouldn't be running your
reads through Cassandra.
On the bright side - Cassandra read throughput will remain consistent,
regardless of your volume. But you are going to have to "wrap"
Hello,
I asked the question as a follow-up under a different thread, so I figure I
should ask here instead in case the other one gets buried, and besides, I
have a little more information.
"We find the lack of performance disturbing" as we are only able to get
about 3-4MB/sec read performance out
This corresponds with my thoughts, but I don't see the issue with high
cardinality columns. In worst case you get potentially as many rows in the
index as in the indexed cf (each having one column).
On Wed, May 16, 2012 at 9:03 PM, Dave Brosius wrote:
> Each index you define on the source CF is
Each index you define on the source CF is created using an internal CF
that has as its key the value of the column it's indexing, and as its
columns, all the keys of all the rows in the source CF that have that
value. So if all your rows in your source CF have the same value, then
your index cf
Txs Jeremiah,
But I am not sure I am following " number of columns could be equal to
number of rows ". Is native index implemented as one cf shared over all
the indexes (one row in the idx CF corresponding to one index) or is there
an internal index cf per index?. My (potential wrong) mindset was
k I thought keyspace was downcased like CFs and all commands, thx
2012/5/16 paul cannon
> Ah, I know why. CQL 3 downcases all your identifiers by default. Wouldn't
> have been a problem if you had created it with CQL 3, cause then the name
> would be "mykeyspace" and it would match what you're a
tracking issue here: https://issues.apache.org/jira/browse/CASSANDRA-4251
might be related to: https://issues.apache.org/jira/browse/CASSANDRA-3794
On 05/16/2012 08:12 AM, Christoph Eberhardt wrote:
Hi there,
if updgraded cassandra from 1.0.8 to 1.1.0. It seemed to work in the first
place, all
Ah, I know why. CQL 3 downcases all your identifiers by default. Wouldn't
have been a problem if you had created it with CQL 3, cause then the name
would be "mykeyspace" and it would match what you're asking for. But since
your keyspace was created with some capital letters in its name, you just
n
Thanks Aaron! We will upgrade to 1.0.9.
Just curious, you said "removing the HintedHandoff files from data/system",
what do the HintedHandoff files look like?
Thanks,
Daning
On Wed, May 16, 2012 at 2:32 AM, aaron morton wrote:
> Looks like this https://issues.apache.org/jira/browse/CASSANDRA-3
Hi,
Sure. I will update the wiki with details. Thank you very much for the your
kind suggestion.
Best Regards
On Tue, May 15, 2012 at 1:53 AM, aaron morton wrote:
> Neat. Would you like to add it to the list here ?
> http://wiki.apache.org/cassandra/Administration%20Tools
>
> Cheers
>
>
> ---
Sylvain has a draft on
https://issues.apache.org/jira/browse/CASSANDRA-3779, and that should
be an official cassandra project doc "real soon now". If
you're asking about Datastax's reference docs for CQL 3, they will probably
be released once Datastax Enterprise or Datastax Community is released w
The limitation is because number of columns could be equal to number of rows.
If number of rows is large this can become an issue.
-Jeremiah
From: David Vanderfeesten [feest...@gmail.com]
Sent: Wednesday, May 16, 2012 6:58 AM
To: user@cassandra.apache.org
Subjec
http://www.datastax.com/dev/blog/whats-new-in-cql-3-0
It's my understanding that that the actual reference documentation for 3.0
should be ready soon. Anyone know when?
-Roland
On Wed, May 16, 2012 at 12:04 AM, Tamil selvan R.S wrote:
> Hi,
> Is there a tutorial or reference on CQL 3.0 Feature
You're in for a world of hurt going down that rabbit hole. If you truely
want version data then you should think about changing your keying to
perhaps be a composite key where key is of form
NaturalKey/VersionId
Or if you want the versioning at the column level, use composite columns
with Col
That was very helpfull, thank you very much!
I still have some questions:
-it is possible to make Cassandra keep old value data after flushing?
The same question for the memTable, before flushing. Seems to me that
when I update some tuple, the old data will be overwrited in memTable,
even before f
Might be related to
https://issues.apache.org/jira/browse/CASSANDRA-3794
On 05/16/2012 08:12 AM, Christoph Eberhardt wrote:
Hi there,
if updgraded cassandra from 1.0.8 to 1.1.0. It seemed to work in the first
place, all seemed to work fine. So I started upgrading the rest of the cluster
(a
Using c1.medium, we are currently able to deliver the service.
What is the the benefit of having more memory ? I mean, I don't
understand why having 1, 2, 4, 8 or 16 GB of memory is so different.
In my mind, Cassandra will fill the heap and from then, start to flush
and compact to avoid OOMing and
Thanks Aaron. The reason I raised the question about memory requirements
is because we are seeing some very low performance on cassandra read.
We are using cassandra as the backend for an IR repository, and granted the
size of each column is very small (OCRed text). Each row represents a book
vo
Hi there,
if updgraded cassandra from 1.0.8 to 1.1.0. It seemed to work in the first
place, all seemed to work fine. So I started upgrading the rest of the cluster
(at the time only one other node, that is a replica). After having a several
errors, I restarted the cluster and now cassandra won'
Hi
I like to better understand the limitations of native indexes, potential
side effects and scenarios where they are required.
My understanding so far :
- Is that indexes on each node are storing indexes for data locally on the
node itself.
- Indexes do not return values in a sorted way (hashes
Yes, I'm aware of those issues however in our use case they don't cause any
problems.
But ... If there's something better out there I'm really curious: so I'll
keep up with this thread.
2012/5/16 Piavlo
> On 05/16/2012 01:24 PM, R. Verlangen wrote:
>
> Hi there,
>
> I'm using HAProxy for PHP
Hi Aaron,
Thanks for the information. :)
Boris
On Wed, May 16, 2012 at 5:57 PM, aaron morton wrote:
> if I do not upgrade the sstables what is going to happen?
>
> Things will break.
> Things you would normally like to work like repair.
>
> The new version nodes can read old data. But when they
On 05/16/2012 01:24 PM, R. Verlangen wrote:
Hi there,
I'm using HAProxy for PHP projects to take care of this. It improved
connection pooling enormous on the client side: with preserving
failover capabilities. Maybe that is something for you to use in
combination with PHP.
I already use it e
Hi there,
I'm using HAProxy for PHP projects to take care of this. It improved
connection pooling enormous on the client side: with preserving failover
capabilities. Maybe that is something for you to use in combination with
PHP.
Good luck!
2012/5/16 Piavlo
>
> Hi,
>
> I'm interested in using
Hi,
I'm interested in using some smart proxy cassandra process that could
act as coordinator node and be aware of cluster state.
And run this smart proxy cassandra process on each client side host
where the application(php) with short lived cassandra connections runs.
Besides being aware of
On Ubuntu ? Sounds like http://wiki.apache.org/cassandra/FAQ#ubuntu_hangs
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 16/05/2012, at 2:13 PM, koji Lin wrote:
> Hi
>
> Our service already run cassandra 1.0 on 1x ec2 instances(with ebs)
> if I do not upgrade the sstables what is going to happen?
Things will break.
Things you would normally like to work like repair.
The new version nodes can read old data. But when they stream old data files
between themselves (during repair) they have to be able to write the bloom
filter, ind
The JVM will not swap out if you have JNA.jar in the path or you have disabled
swap on the machine (the simplest thing to do).
Cassandra uses memory mapped file access. If you have 16GB of ram, 8 will go to
the JVM and the rest can be used by the os to cache files. (Plus the off heap
stuff)
C
> 1 - I got this kind of message quite often (let's say every 30 seconds) :
You are running out of memory. Depending on the size of your schema and the
work load you will want to start with 4 or 8 GB machines. But most people get
the best results with 16Gb.
On AWS the common setup is to use m1.x
Looks like this https://issues.apache.org/jira/browse/CASSANDRA-3975
Fixed in the latest 1.0.9.
Either upgrade (which is always a good idea) or purge the hints from the
server. Either using JMX or stopping the node and removing the HintedHandoff
files from data/system.
In either case you sho
Abhijit,
Can you explain the data model a bit more.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 15/05/2012, at 10:32 PM, samal wrote:
> It is just column with JSON value
>
> On Tue, May 15, 2012 at 4:00 PM, samal wrote:
> I h
That scenario can result in slower reads than narrow rows that are updated less
frequently.
Like most things it depends. Do you have a feel for how wide and what the
update pattern is like ?
Things like levelled compaction
(http://www.datastax.com/dev/blog/leveled-compaction-in-apache-cassan
well yes, since I can retrieve the keyspace and all CF (not SCF, it's
normal in cql?) with cqlsh (v2),
tic@mPC:~$ cqlsh 1xx.xx.xxx.xx 9165
Connected to Test Cluster at 1xx.xx.xxx.xx:9165.
[cqlsh 2.2.0 | Cassandra 1.1.0 | CQL spec 2.0.0 | Thrift protocol 19.30.0]
Use HELP for help.
cqlsh> use Mykey
tx was looking at http://code.google.com/p/javageomodel/ too
2012/5/14 aaron morton
> So it seems it's not a good idea, to use Cassandra like that?
>
> Right. It's basically a table scan.
>
> Here is some background on the approach simple geo took to using
> Cassandra...
> http://www.readwritewe
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