it's here
http://github.com/rantav/hector/blob/master/src/test/java/me/prettyprint/cassandra/service/KeyspaceTest.java
On Wed, May 26, 2010 at 8:18 AM, Nicholas Sun nick@raytheon.com wrote:
Could you please provide some indication as to their location? Thanks.
Nick
*From:* Ran
Hi everyone,
in our test code we perform a dummy clear by reading all the rows
and deleting them (while waiting for cassandra 0.7 CASSANDRA-531).
A couple of days ago I updated our code to perform this operation
using batchMutate, but there seem to be no way to perform a deletion
of the whole
This has been fixed in 0.7
(https://issues.apache.org/jira/browse/CASSANDRA-1027).
Not sure this has been merged in 0.6 though.
On Wed, May 26, 2010 at 9:05 AM, gabriele renzi rff@gmail.com wrote:
Hi everyone,
in our test code we perform a dummy clear by reading all the rows
and deleting
You could either use 1 remove(keyspace, key, column_path, timestamp,
consistency_level) per aech key, or wait till
https://issues.apache.org/jira/browse/CASSANDRA-494 fixed (to use
SliceRange in the Deletion)
gabriele renzi wrote:
Is it correct that I cannot perform a row delete via
On Wed, May 26, 2010 at 9:54 AM, Mishail mishail.mish...@gmail.com wrote:
You could either use 1 remove(keyspace, key, column_path, timestamp,
consistency_level) per aech key, or wait till
https://issues.apache.org/jira/browse/CASSANDRA-494 fixed (to use
SliceRange in the Deletion)
thanks,
Just in case you don't know: You can do range searches on keys even with
Random Partitioner, you just won't get the results in order. If this is good
enough for you (e.g. if you can order the results on the client, or if you
just need to get the right answer, but not the right order), then you
The summary of your question is: is batch_mutate atomic in the general
sense, meaning when used with multiple keys, multiple column families etc,
correct?
On Wed, May 26, 2010 at 12:45 PM, Todd Nine t...@spidertracks.co.nz wrote:
Hey guys,
I originally asked this on the Hector group, but no
There are no single API call to achieve this.
It’s read and write, plus a delete (if move) API calls I guess.
From: Utku Can Topçu [mailto:u...@topcu.gen.tr]
Sent: Wednesday, May 26, 2010 9:09 PM
To: user@cassandra.apache.org
Subject: Moving/copying columns in between ColumnFamilies
I've got a mostly working Avro server and client for HBase at
http://github.com/hammer/hbase-trunk-with-avro and
http://github.com/hammer/pyhbase. If you replace scan with slice, it
shouldn't be too much different for Cassandra...
On Mon, May 17, 2010 at 10:31 AM, Wellman, David da...@tynt.com
Fantastic! Thank you.
On May 26, 2010, at 8:38 AM, Jeff Hammerbacher wrote:
I've got a mostly working Avro server and client for HBase at
http://github.com/hammer/hbase-trunk-with-avro and
http://github.com/hammer/pyhbase. If you replace scan with slice, it
shouldn't be too much different
We're investigating Cassandra, and we are looking for a way to get Cassandra
use more than 50% of it's data disks. Is this possible?
For major compactions, it looks like we can use more than 50% of the disk if
we use multiple similarly sized column families. If we had 10 column
families of the
Hi,
I'm seeing a problem with inserting columns into one key using multiple
threads and I'm not sure if it's a bug or if it's my misunderstanding of how
insert/get_slice should work.
My setup is that I have two separate client processes, each with a single
thread, writing concurrently to
Correct me if I'm wrong here. Even though you can get your results with Random
Partitioner, it's a lot less efficient if you're going across different
machines to get your results. If you're doing a lot of range queries, it makes
sense to have things ordered sequentially so that if you do
So after CASSANDRA-579, anti compaction won't be done on the source node,
and we can use more than 50% of the disk space if we use multiple column
families?
Thanks,
Sean
On Wed, May 26, 2010 at 10:01 AM, Stu Hood stu.h...@rackspace.com wrote:
See
Sent from my iPhone
So I am not sure if you guys are familiar with OCM . Basically it is
an ORM for Cassandra. Been testing it
So I have created model that has the following object relationship.
OCM generates the code from this that allows me to do easy
programmatic query from Java to Cassandra.
Are there any exceptions in the log like the one in
https://issues.apache.org/jira/browse/CASSANDRA-1019 ?
If so you'll need to restart the moving node and try again.
On Wed, May 26, 2010 at 3:54 AM, Ran Tavory ran...@gmail.com wrote:
I ran nodetool move on one of the nodes and it seems stuck
I don't think that queries on a key range are valid unless you are using OPP.
As far as hashing the key for OPP goes, I take it to be the same a not
using OPP. It's really a matter of where it gets done, but it has much
the same effect.
(I think)
Jonathan
On Wed, May 26, 2010 at 12:51 PM, Peter
On Wed, May 26, 2010 at 7:45 PM, Dodong Juan dodongj...@gmail.com wrote:
So I am not sure if you guys are familiar with OCM . Basically it is an ORM
for Cassandra. Been testing it
In case anyone is interested I have posted a reply on the OCM issue
tracker where this was also raised.
If I disable row cache the numbers look good - key cache hit rate is 0, so
it seems to be related to row cache.
Interestingly, after running for a really long time and with both row and
keys caches I do start to see Key cache hit rate 0 but the numbers are so
small that it doesn't make sense.
I
I wrote some Iterable* methods to do this for column families that
share key structure with OPP.
It is on the hector examples page. Caveat emptor.
It does iterative chunking of the working set for each column family,
so that you can set the nominal transfer size when you construct the
What is the best timestamp to use while using Cassandra with C#? I have been
using DateTime.Now.Ticks, but I have seen others using different things.
Thanks.
On 26 May 2010 22:42, Steven Haar sh...@vintagesoftware.com wrote:
What is the best timestamp to use while using Cassandra with C#? I have
been using DateTime.Now.Ticks, but I have seen others using different
things.
The standard that most clients seem to use is epoch-microseconds, or
Right, in C# this would be (not the most efficient way, but you get the
idea):
long timestamp = (DateTime.Now.Ticks - new DateTime(1970, 1, 1).Ticks)/10;
On Wed, May 26, 2010 at 4:50 PM, Mark Robson mar...@gmail.com wrote:
On 26 May 2010 22:42, Steven Haar sh...@vintagesoftware.com wrote:
On 26 May 2010 22:56, Miguel Verde miguelitov...@gmail.com wrote:
Right, in C# this would be (not the most efficient way, but you get the
idea):
long timestamp = (DateTime.Now.Ticks - new DateTime(1970, 1, 1).Ticks)/10;
Yeah, you're fine provided:
a) All your client applications (which
It sure sounds like you're seeing the my row cache contains the
entire hot data set, so the key cache only gets the cold reads
effect.
On Wed, May 26, 2010 at 2:54 PM, Ran Tavory ran...@gmail.com wrote:
If I disable row cache the numbers look good - key cache hit rate is 0, so
it seems to be
Are there any thoughts on adding a more complex query to Cassandra?
At a high level what I'm wondering is: Would it be possible/desirable/in
keeping with the Cassandra plan, to add something like a javascript blob on
to a get range slice etc, that does some further filtering on the results
before
I'm very curious on this topic as well. Mainly, I'd like to know is this
functionality handled through Map/Reduce HADOOP operations?
Nick
From: Jeremy Davis [mailto:jerdavis.cassan...@gmail.com]
Sent: Wednesday, May 26, 2010 3:31 PM
To: user@cassandra.apache.org
Subject: Thoughts on
Hi all,
I'm currently looking at new database options for a URL shortener in order
to scale well with increased traffic as we add new features. Cassandra seems
to be a good fit for many of our requirements, but I'm struggling a bit to
find ways of designing certain indexes in Cassandra due to its
The example is a little confusing.
.. but ..
1) sharding
You can square the capacity by having a 2-level map.
CF1-row-value-CF2-row-value
This means finding some natural subgrouping or hash that provides a
good distribution.
2) hashing
You can also use some additional key hashing to spread the
2010/5/26 Utku Can Topçu u...@topcu.gen.tr
Hi Jeremy,
Why are you using Cassandra versus using data stored in HDFS or HBase?
- I'm thinking of using it for realtime streaming of user data. While
streaming the requests, I'm also using Lucandra for indexing the data in
realtime. It's a
so the row cache contains both rows and keys and if I have large enough row
cache (in particular if row cache size equals key cache size) then it's just
wasteful to keep another key cache and I should eliminate the key-cache,
correct?
On Thu, May 27, 2010 at 1:21 AM, Jonathan Ellis
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