On Fri, Oct 1, 2010 at 8:56 PM, Eric Evans wrote:
>
> If you're coming from 0.6, there are some things to be aware of, so be
> sure to read the release notes[2].
should the release notes have the sentence
"Stand up your cluster with the 0.7 version. "
kind of seems start up to me, but I may
On Sun, Jul 18, 2010 at 5:28 PM, osishkin osishkin wrote:
> I didn't find in the documentation a way to configure message logging
> that I'm looking for, so I appologize if this is a trivial question.
> Is there a simple guide to configuring logging options in Cassandra?
> I saw references to outp
On Mon, May 31, 2010 at 8:50 PM, Jonathan Ellis wrote:
> Doesn't ring a bell. Maybe if you included the link to which you refer?
I guess this is the related post
http://spyced.blogspot.com/2009/05/consistent-hashing-vs-order-preserving.html
thought I believe the original poster misphrased or mi
On Fri, May 28, 2010 at 3:48 PM, Mark Greene wrote:
> First thing I would do is stripe your EBS volumes. I've seen blogs that say
> this helps and blogs that say it's fairly marginal.
just to point out: another option is to stripe the ephemeral drives
(if using instances > small)
On Fri, May 28, 2010 at 11:05 AM, huajun qi wrote:
> Is there anyway to remove a row completely?
> I use thrift client's remove method , it only deletes the columns under a
> row, but the row with its key is still there.
> How can I remove it completely?
you can't really, with the thrift api, s
On Thu, May 27, 2010 at 9:23 PM, Sean Bridges wrote:
> But doesn't having multiple similarly sized column families mean in-node
> compaction does not require 50% of disk? Looking at compaction manager,
> only 1 thread is doing a compaction, so we only need enough free disk space
> to compact the
On Wed, May 26, 2010 at 8:00 PM, Sean Bridges wrote:
> 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?
Sorry if I misunderstand, but #579 seems to only solve half of your question,
I b
On Tue, May 25, 2010 at 6:35 PM, Jeremy Hanna
wrote:
> What is the use case?
we end up with messed up data in the database, we run a mapreduce job
to find irregular data from time to time.
> Why are you using Cassandra versus using data stored in HDFS or HBase?
as of now our mapreduce task i
On Wed, May 26, 2010 at 9:54 AM, Mishail 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, I'm already doing that b
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
On Fri, May 14, 2010 at 12:43 AM, Paul Prescod wrote:
> I'm curious what the relevance of CASSANDRA-1016 is.
I guess if you had "operations" moved to the data you could implement
incr/decr easily: read the previous value, add one, write the new
value. This does not yet seem what 1016 is for thoug
On Wed, May 12, 2010 at 5:46 PM, Johan Oskarsson wrote:
> Looking over the code this is in fact an issue in 0.6.
> It's fixed in trunk/0.7. Connections will be reused and closed properly, see
> https://issues.apache.org/jira/browse/CASSANDRA-1017 for more details.
>
> We can either backport that
On Wed, May 12, 2010 at 4:43 PM, Jonathan Ellis wrote:
> On Wed, May 12, 2010 at 5:11 AM, gabriele renzi wrote:
>> - is it possible that such errors show up on the client side as
>> timeoutErrors when they could be reported better?
>
> No, if the node the client is talking t
a follow up for anyone that may end up on this conversation again:
I kept trying and neither changing the number of concurrent map tasks,
nor the slice size helped.
Finally, I found out a screw up in our logging system, which had
forbidden us from noticing a couple of recurring errors in the logs
On Fri, May 7, 2010 at 2:44 PM, Jonathan Ellis wrote:
> Sounds like you need to configure Hadoop to not create a whole bunch
> of Map tasks at once
interesting, from a quick check it seems there are a dozen threads running.
Yet , setNumMapTasks seems to be deprecated (together with JobConf)
and
On Fri, May 7, 2010 at 2:53 PM, Matt Revelle wrote:
> There's also the mapred.task.timeout property that can be tweaked. But
> reporting is the correct way to fix timeouts during execution.
re: not reporting, I thought this was not needed with the new mapred
api (Mapper class vs Mapper interf
On Fri, May 7, 2010 at 3:02 PM, Joost Ouwerkerk wrote:
> Joseph, the stacktrace suggests that it's Thrift that's timing out,
> not the Task.
>
> Gabriele, I believe that your problem is caused by too much load on
> Cassandra. Get_range_slices is presently an expensive operation. I
> had some succ
Hi everyone,
I am trying to develop a mapreduce job that does a simple
selection+filter on the rows in our store.
Of course it is mostly based on the WordCount example :)
Sadly, while it seems the app runs fine on a test keyspace with little
data, when run on a larger test index (but still on a
On Fri, Apr 16, 2010 at 6:41 PM, Peter Chang wrote:
> FB also does pics and movies so 1MB is way off depending on where they
> manage such binary data.
apparently not in cassandra http://www.facebook.com/note.php?note_id=76191543919
>I do agree that 1MB of text alone is a lot of text
> which is
On Fri, Apr 16, 2010 at 1:10 AM, Anthony Molinaro
wrote:
> Hi,
>
> I have a cluster running on ec2, and would like to do some ring
> management. Specifically, I'd like to replace an existing node
> without another node (I want to change the instance type).
does maybe `nodetool move` do what yo
On Thu, Apr 15, 2010 at 9:56 AM, Allen He wrote:
> Hello folks,
>
> When Twissandra (Twitter clone example for Cassandra) post a tweet, it
> iterate all of the followers to insert a tweet_id to their time lines(see
> for follower_id in follower_ids:
> TIMELINE.insert(str(follower_id)
On Tue, Apr 6, 2010 at 9:11 AM, Paul Prescod wrote:
> This may be the blind leading the blind...
> On Mon, Apr 5, 2010 at 11:54 PM, Tatu Saloranta
> wrote:
>>...
>
>>
>> I think the key is that this is not automatic -- there is no general
>> mechanism for aggregating distinct modifications. Point
On Tue, Apr 6, 2010 at 2:10 AM, Paul Prescod wrote:
> On Mon, Apr 5, 2010 at 4:48 PM, Tatu Saloranta wrote:
>> ...
>>
>> I would think that there is also possibility of losing some
>> increments, or perhaps getting duplicate increments?
>
> I believe that with vector clocks in Cassandra 0.7 you w
On Sat, Apr 3, 2010 at 6:40 PM, Avinash Lakshman
wrote:
> We use anywhere from 3-5 seeds for clusters that have over 150 nodes. That
> should suffice for larger sizes too since they are only for initial
> discovery.
would it make sense to just use a round robin dns on the available
nodes and use
On Fri, Apr 2, 2010 at 12:46 PM, Shuge Lee wrote:
> For example:
> user['lee'] = {
> 'name': 'lee',
> 'age'; '21',
> 'girls': ['java', 'actionscript', 'python'],
> }
> how to store above in Apache Cassndra ?
check what a SuperColumn is in the wiki
--
blog en: http://www.riffraff.inf
On Wed, Mar 24, 2010 at 3:36 PM, Oleg Mürk wrote:
> Hi Jonathan,
>
> On Wed, Mar 24, 2010 at 4:32 PM, Jonathan Ellis wrote:
>>
>> probably 0.5.1 is allowing an invalid query and erroring out when it
>> actually runs it.
>
> I am pretty sure that the same query works OK when I initially start
> Ca
On Sat, Mar 20, 2010 at 4:54 AM, Ran Tavory wrote:
> Hector is a java client for cassandra,
> see http://github.com/rantav/hector , http://prettyprint.me/2010/02/23/hector-a-java-cassandra-client/ , http://prettyprint.me/2010/03/03/load-balancing-and-improved-failover-in-hector/
Hey Ran,
> Over
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