Howdy,
I'm working on transferring an existing Ruby on Rails project from Postgres to
Cassandra and I have a couple questions about the Ruby client libraries and
client libraries in general.
1.) Is it the opinion of the community and the Datastax engineers that client
libraries should migrate
On Mon, Dec 5, 2011 at 8:19 AM, Boris Yen wrote:
> Hi,
>
> I am using 0.8.7.
>
> I was trying to use DynamicComposite column. After I intentional added a
> column (string:string:uuid) into a record which has previous columns
> inserted with comparator (string:uuid:uuid). I got an exception on the
Hi
Thanks for the answer, as I read the book on Cassandra, I was not aware at
that time on Composite Key which I recently discovered.
You mentioned a TTL and let the database remove the date for me. I never read
about that. Is it possible without an external batch ?
I will try to rephra
It looks like using the dynamicComposite is a dangerous action. However,
one mistaken insertion causes the database to corrupt seems a little bit
too much. Is there anyway to just skip the wrong column.
On Mon, Dec 5, 2011 at 5:31 PM, Sylvain Lebresne wrote:
> On Mon, Dec 5, 2011 at 8:19 AM, Bori
I think most of the book for cassandra are outdated, try to get information
from http://www.datastax.com/docs/1.0/index
As for ttl, you could read
http://www.datastax.com/dev/blog/whats-new-cassandra-07-expiring-columns for
more information.
for composite type, you could read
http://www.slideshar
On Mon, Dec 5, 2011 at 3:06 PM, wrote:
> Hi
> Thanks for the answer, as I read the book on Cassandra, I was not aware at
> that time on Composite Key which I recently discovered.
>
*Composite Type's are useful for handling data-versions.
*
* *
> * *You mentioned a TTL and let the database remov
I don't think that this is the problem because I'm testing on a
supercomputer with 16T RAM.
Is it possible, that cassandra runs into this bug of the jvm?
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6399443
On Mon, Dec 5, 2011 at 06:29, samal wrote:
> Lower your heap size, if you are testi
Hi.
We are faced with strange problem where Cassandra nodes lose each other
only one day of week, on friday, in exactly 14:50 PM, within several months.
On that time each node periodically reports that other nodes are dead.
At same time nodes are working fine.
This continues about one hour, aft
Konstantin,
Have you checked the weekly cron job list on the servers or looked at the
system logs at those rough times to see what the servers are doing? I doubt
Cassandra has any time-sensitive code in it to kill off connections at
14:50pm, so my guess is something on the host causing the problem
Hi Matt,
This is definitely not at all an authoritative opinion... I am still
figuring things out with Cassandra... Others may want to correct me...
Charles Maxwood(sp?) started a 'Sandra' project on github to make access to
Cassandra, more or less, similar to Active Record... it is very early sta
From: "Matthew Stump"
To: user@cassandra.apache.org
Sent: Monday, December 5, 2011 2:59:34 AM
Subject: Ruby, CQL and client libraries
Howdy,
I'm working on transferring an existing Ruby on Rails project from Postgres to
Cassandra and I have a couple questions about the Ruby client librar
Hey folks, so I have been noodling on using node.js as a new front end for
the system I built for doing real time aggregate metrics within our
distributed systems.
Does anyone have experience or background story on this lib?
http://code.google.com/a/apache-extras.org/p/cassandra-node/ it seems to
As far as I know its the library that was developed by "rackspace".
See
https://github.com/racker/node-cassandra-client
As rackspace is using node.js + cassandra I would expect it works ;)
Bye,
Norman
2011/12/5 Joe Stein
> Hey folks, so I have been noodling on using node.js as a new front
Hello,
We currently have data stored in a bi-temporal fashion using a DBRMS.
I've been trying to find recommendations on how to model bi-temporal using a
NoSQL database such as Cassandra but without much success. Does anybody in the
list have had success in doing such thing in Cassandra
On Mon, Dec 5, 2011 at 7:59 PM, Norman Maurer
wrote:
> As far as I know its the library that was developed by "rackspace".
>
> See
> https://github.com/racker/node-cassandra-client
>
*No longer maintained. it is moved as separate project in apache-extras *
2011/12/5 Joe Stein
> Hey folks, so
Hi,
I am using apache-cassandra-1.0.0 and I tried to insert/retrieve data in a
column family using cassandra-jdbc program.
Here is how I created 'USER' column family using cassandra-cli.
create column family USER with comparator=UTF8Type
and column_metadata=[{column_name: user_id, validation_clas
Thank you for reply.
Yes, we have checked windows event logs and task scheduler, but haven't
seen anything special.
In addition, We have deployed one more cluster on same machines without any
data and problem haven't reproduced on same time. It's very strange.
On Mon, Dec 5, 2011 at 7:45 PM, Riya
If I update a keyspace to increase the replication factor; what
happens to existing data for that keyspace ? Does the existing data
get automatically increase its replication ? Or only on a RR or node
repair does the existing data increase its replication factor ?
Thanks.
Cassandra's data model is NOT table based. The key is not a column, it
is a separate value. "index_type: KEYS" means you are creating an
index on that column, and that index can only be acessed in an
equality query ( column = x ).
You should probably read http://www.datastax.com/docs/1.0/ddl/inde
key_validation_class is different from validation_class
validation are BytesType by default.
key_valdation_class => key
default_validation_class=>column_values
comparator=>column_name
default_validation_class is global scope of validation_class
On Mon, Dec 5, 2011 at 10:10 PM, Dinusha Dilrukshi
Ah yes, I should clarify. What I should have said was an ORM type library
which uses cassandra-cql as it's base. What I was looking for was someone that
had wrapped cassandra-cql with an active record or data mapper compatibility
layer.
My concern is that it i'm looking for a ruby client th
http://www.datastax.com/docs/1.0/operations/cluster_management#changing-the-replication-factor
It looks like a nodetool repair is needed after increasing your RF. I guess
that a cleanup has to be performed after decreasing the RF to remove
useless replica.
Alain
2011/12/5 A J
> If I update a k
Hi Filipe/ Samal,
Thanks for clarifications.
Regards,
~Dinusha~
On Mon, Dec 5, 2011 at 10:28 PM, samal wrote:
> key_validation_class is different from validation_class
> validation are BytesType by default.
>
> key_valdation_class => key
> default_validation_class=>column_values
> comparator
You may run "stress -d " to create Standard1 CF and data.
On Dec 3, 2011, at 3:44 PM,
wrote:
> Hi Zhong Li,
>
> When I used stress tool to test, I got:
>
> Operation [15] retried 10 times - error inserting key 0015
> ((InvalidRequestException): unconfigured columnfamily Standard1)
>
> Op
Hey, trying to grab cqlsh for a 0.8.6 cluster but all the online docs I am
finding are pointing to http://www.apache.org/dist/cassandra/drivers/py or
say it moved to the source and checked there in the 0.8 branch and nothing
either... also saw something about about 2.0 not being compatible with
0.8
Hello,
I'm building a system using Cassandra as a datastore and I have a few
places where I am need of transactions.
I'm using ZooKeeper to provide locking when I'm in need of some concurrency
control or isolation, so that solves that half of the puzzle.
What I need now is to sometimes be able t
Using PigStorage() my pig script output gets put into partial files on the
hadoop
file system.
When I use the copyToLocal fuction from Hadoop it creates a local directory with
all the partial files.
Is there a way to copy the partial files from hadoop into a single local file?
Thanks
Basically I tweaked the phi, put in more verbose GC reporting and
decided to do a compaction before I proceed. I'm getting this on the
node where compaction is being run. And the system log for the other two
nodes follows. It's obvious that the cluster is sick, but I
can't determine why -- ther
i think getmerge will work.
On Sun, Dec 4, 2011 at 11:59 PM, Matthew Stump wrote:
>
> 3.) Other than the fauna/twitter client what are other people using for Ruby?
I'm probably the only person using JRuby + Hector. This ended up
being a big win since to get high performance with Cassandra you
either need many clients or a
Hello,
upon startup, in my cluster of 3 machines, I see similar messages in
system.log
on each node (below). I start nodes one by one, after I ascertain the
previous one
is online. So they can't reach schema agreement, all of them. Why? No
unusual
load visible in Ganglia plots.
ERROR [Hinted
On Mon, Dec 5, 2011 at 1:40 PM, Joe Stein wrote:
> Hey, trying to grab cqlsh for a 0.8.6 cluster but all the online docs I am
> finding are pointing to http://www.apache.org/dist/cassandra/drivers/py or
> say it moved to the source and checked there in the 0.8 branch and nothing
> either...
Right
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