Here are some more details that might help:
1. You are right that Seeds are referred on startup to learn about the ring.
2. It is a good idea to have more than 1 seed. Seed is not SPoF. Remember
Gossip also provides eventual consistency. So if seed is missing, the new
node may not have the correct
Thank you very much Ellis, I heard about Brisk two weeks ago and I'm already
checking DataStax web site twice a day waiting for Brisk to come.
It seems that it will be a good solution for us.
Once more question please: the Brisk way of operation need to transfer
intermediate data from Cassandra st
AFAIk the practical limit comes from creating a CF for each secondary index
that has the same memtable settings as the containing CF. And the extra time it
takes to maintain the index for each indexed column, sample the files when
starting up, hold their bloom filters and index samples, keep the
You want to run map/reduce jobs for your use case. You can already do
this with Cassandra (http://wiki.apache.org/cassandra/HadoopSupport),
and DataStax is introducing Brisk soon to make it easier:
http://www.datastax.com/products/brisk
On Wed, Apr 20, 2011 at 9:36 PM, Jonathan Ellis wrote:
> CQL
Sure, the update queue could just as well replicate problems, but the queue
would be a lot simpler than cassandra and it would not modify already
acknowledged data like like for instance compaction or read-repair/hint
deliveries may. There is a fair bit of re-writing/re-assemblying of data
even tho
CQL changes the API, that is all.
On Wed, Apr 20, 2011 at 5:40 PM, Constantin Teodorescu
wrote:
> My use case is as follows: we are using in 70% of the jobs information
> retrieval using keys, column names and ranges and up to now, what we have
> tested suits our need.
> However, the rest of 30%
I made self answered faqs on seed after reading the wiki and code.
If I misunderstand something, please point out to me.
== What are seeds? ==
Seeds, or seed nodes are the nodes which new nodes refer to on
bootstrap to know ring information.
When you add a new node to ring, you need to specify at
Queues replicate bad data just as well as anything else. The biggest
source of bad data is broken app code... You will still need to
implement a reconciliation/repair checker, as queues have their own
failure modes when they get backed up. We have also looked at using
queues to bounce data between
That was the trick. Thanks!
On Apr 20, 2011, at 6:05 PM, Jonathan Ellis wrote:
> See the comments for describe_schema_versions.
>
> On Wed, Apr 20, 2011 at 4:59 PM, William Oberman
> wrote:
>> Hi,
>>
>> My unit tests started failing once I upgraded from a single node cassandra
>> cluster to a
Assuming that you generally put an API on top of this, delivering to two or
more systems then boils down to a message queue issue or some similar
mechanism which handles secure delivery of messages. Maybe not trivial, but
there are many products that can help you with this, and it is a lot easier
t
My use case is as follows: we are using in 70% of the jobs information
retrieval using keys, column names and ranges and up to now, what we have
tested suits our need.
However, the rest of 30% of the jobs involve full sequential scan of all
records in the database.
I found some web pages describin
Thank you, I'll wait for 0.7.5 distribution when it will be shipped to test
it again!
Up to now, I'm satisfied with cassandra, we are evaluating it for migrating
our PostgreSQL solution to a mixed [couchdb + bigcouch + cassandra]
architecture !
Best regards,
Teo
On Thu, Apr 21, 2011 at 1:15 AM, Jo
sounds like https://issues.apache.org/jira/browse/CASSANDRA-2347
On Wed, Apr 20, 2011 at 5:10 PM, Constantin Teodorescu
wrote:
> Cassandra 0.7.4 on 4 nodes Linux Ubuntu 10.10 i386 , 32 bit
> root@bigcouch-106:/etc/cassandra# nodetool -h 172.16.1.106 ring
> Address Status State Load
A few months ago I was seeing 12k writes/s on a single EC2 XL. So
something is wrong.
My first suspicion is that your client node may be the bottleneck.
On Wed, Apr 20, 2011 at 2:56 PM, Alex Araujo
wrote:
> Does anyone have any Ec2 benchmarks/experiences they can share? I am trying
> to get a s
Cassandra 0.7.4 on 4 nodes Linux Ubuntu 10.10 i386 , 32 bit
root@bigcouch-106:/etc/cassandra# nodetool -h 172.16.1.106 ring
Address Status State LoadOwnsToken
172.16.1.104Up Normal 1.8 GB 22.33%
4778396862879243066278530647513341098
172.16.1.8 Up
See the comments for describe_schema_versions.
On Wed, Apr 20, 2011 at 4:59 PM, William Oberman
wrote:
> Hi,
>
> My unit tests started failing once I upgraded from a single node cassandra
> cluster to a full "N" node cluster (I'm starting with 4). I had a few
> various bugs, mostly due to forget
"internal error" means an error on the server. check the server log for the
stacktrace.
On Wed, Apr 20, 2011 at 11:54 AM, Renato Bacelar da Silveira <
renat...@indabamobile.co.za> wrote:
> Hi all
>
> I am just augmenting the information on the following error:
>
> -- error --
Hi,
My unit tests started failing once I upgraded from a single node cassandra
cluster to a full "N" node cluster (I'm starting with 4). I had a few
various bugs, mostly due to forgetting to read/write at a quorum level in
places I needed stronger consistency guarantees. But, I kept getting
rand
Hi Terje,
If you feed data to two rings, you will get inconsistency drift as an
update to one succeeds and to the other fails from time to time. You
would have to build your own read repair. This all starts to look like
"I don't trust Cassandra code to work, so I will write my own buggy
one off ve
Does anyone have any Ec2 benchmarks/experiences they can share? I am
trying to get a sense for what to expect from a production cluster on
Ec2 so that I can compare my application's performance against a sane
baseline. What I have done so far is:
1. Lunched a 4 node cluster of m1.xlarge inst
See the first entry in http://wiki.apache.org/cassandra/JmxGotchas
On Wed, Apr 20, 2011 at 9:54 AM, tinhuty he wrote:
> Maki,
>
> Yes you are right, 8081 is mx4j port, the JMX_PORT is 8001 in the
> cassandra-env.sh.
>
> in the cassandra Linux server itself, I can run this successfully:
> nodetoo
You must be using an old Cassandra and/or nodetool; current nodetool calls
forceBlockingFlush which does not try to return a Future over JMX.
On Wed, Apr 20, 2011 at 9:38 AM, Desimpel, Ignace
wrote:
> Using own JMX java code and when using the NodeTool I get the following
> exception when calling
Also for the new users like me, don't assume DC1 is a keyword like I did. A
working example of a keyspace in EC2 is:
create keyspace test with replication_factor=3 and strategy_options =
[{us-east:3}] and
placement_strategy='org.apache.cassandra.locator.NetworkTopologyStrategy';
For a single DC
Maki,
Yes you are right, 8081 is mx4j port, the JMX_PORT is 8001 in the
cassandra-env.sh.
in the cassandra Linux server itself, I can run this successfully:
nodetool -host x -p 8001 ring
x is the actually IP address
however when I run the same command in another windows machine(which
Using own JMX java code and when using the NodeTool I get the following
exception when calling the forceFlush function.
But it seems that the flushing itself is started although the exception
occurred.
Any idea?
(running jdk 1.6, 64 bits)
Ignace
2011-04-20 16:23:45 INFO ColumnFamilyStor
Thanks Sylvain. Your answer already helped me out a lot! I was using a
ByteBuffer.get function that is changing the ByteBuffer's position. And
I got all kinds of stranges effects and exceptions I didn't get in
0.6.x. Changed that code and all problems are gone...
Many thanks!!
Ignace
-Origina
On Wed, Apr 20, 2011 at 3:06 PM, Desimpel, Ignace
wrote:
> As said above, the remaing bytes won't (always) be the actual bytes.
Sorry I answered a bit quickly, I meant to say that the actual bytes
won't (always) be the full backing array.
That is, we never guarantee that BB.arrayOffset() == 0, no
Aaron,
Already found out what the problem was. I was using an AbstractType
comparator for a column family. That code was changing the given
ByteBuffer position and was not supposed to do that (Hinted by Sylvain
Lebresne !).
Anyway, after correcting that problem I got back the results as before
-Original Message-
From: Sylvain Lebresne [mailto:sylv...@datastax.com]
Sent: Wednesday, April 20, 2011 2:07 PM
To: user@cassandra.apache.org
Subject: Re: Question about AbstractType class
On Wed, Apr 20, 2011 at 1:35 PM, Desimpel, Ignace
wrote:
> Cassandra version 0.7.4
>
>
>
> Hi,
>
I'm using the org.apache.cassandra.thrift.CassandraDeamon
implementation. I have done the same with version 0.6.x but now modified
the code for version 0.7.4. I could restart without problem in 0.6.x.
I get (did not add them all) the following messages :
(Keyspace is 'SearchSpace', CF names li
On Wed, Apr 20, 2011 at 1:35 PM, Desimpel, Ignace
wrote:
> Cassandra version 0.7.4
>
>
>
> Hi,
>
>
>
> I created my own java class as an extension of the AbstractType class. But
> I’m not sure about the following items related to the compare function :
>
> # The remaining bytes of the buffer somet
Checking the simple things first, are you using the
o.a.c.service.EmbeddedCassandraService or the o.a.c.EmbeddedServer in the unit
test directory ? The later deletes data, but it does not sound like you are
using it.
When the server starts it should read any commit logs, roll them forward and
Cassandra version 0.7.4
Hi,
I created my own java class as an extension of the AbstractType class.
But I'm not sure about the following items related to the compare
function :
# The remaining bytes of the buffer sometimes is zero during thrift
get_slice execution, however I never store any
El mié, 20-04-2011 a las 23:00 +1200, aaron morton escribió:
> Looks like a bug, I've added a patch
> here https://issues.apache.org/jira/browse/CASSANDRA-2519
>
>
> Aaron
>
That was fast! Thanks Aaron
Cassandra version 0.7.4
Hi,
I'm storing (no deletion) in a small test some records to an embedded
Cassandra instance.
Then I connect using Thrift and I can retrieve the data as excepted.
Then I restart the server with the embedded Cassandra, reconnect using
Thrift but now the same quer
Looks like a bug, I've added a patch here
https://issues.apache.org/jira/browse/CASSANDRA-2519
Aaron
On 20 Apr 2011, at 13:15, aaron morton wrote:
> Thats what I was looking for, thanks.
>
> At first glance the behaviour looks inconsistent, we count the number of
> columns in the delete muta
my false,
ignore last post.
2011/4/20 pob
> Hi,
>
> everything works fine with cassandra 0.7.5, but when I tried with 0.7.3
> another errors showed up, but task finished with success whats strange.
>
>
> 2011-04-20 11:45:40,674 INFO org.apache.hadoop.mapred.TaskInProgress: Error
> from att
Hi,
everything works fine with cassandra 0.7.5, but when I tried with 0.7.3
another errors showed up, but task finished with success whats strange.
2011-04-20 11:45:40,674 INFO org.apache.hadoop.mapred.TaskInProgress: Error
from attempt_201104201139_0004_m_00_3: Error: java.lang.ClassNot
Hi,
that was the problem! Thanks, you should pick that stuff into your
documentation.
Thanks for help!
Best,
P
2011/4/20 Jeremy Hanna
> Just as an example:
>
>
>cassandra.thrift.address
>10.12.34.56
>
>
>cassandra.thrift.port
>9160
>
>
>cassandra.partitioner.cl
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