thank you Aaron,
seems it's bug on cql 2.*.* version, through cassandra-cli it's working fine.
Create issue CASSANDRA-4996
27.11.2012, 11:34, aaron morton aa...@thelastpickle.com:
is it expectable behaviour? or it's bug?
It exhibits bug like qualities.
Can you create a ticket on
Hello,
I have a question about codd's rules and cassandra cuz im doing a school
project sith my colleagues. I know that cassandra is NOSQL type of dbms,
but witch of 12 codd's rules can me applied?
Thank you very much! :)
Rules that apply:
2 - guaranteed access
3 - treatment of nulls (though different than an rdbms due to the inherent
sparse nature of rows)
4 - online catalog (not really true until Cassandra 1.2 and CQL 3
5 - comprehensive data sub language (only if you remove the word relational)
6 - view updating
I am just taking a stab at this one. UUID's interact with system time and
maybe your real time os is doing something funky there. The other option,
which seems more likely, is that your unit tests are not cleaning up their
data directory and there is some corrupt data in there.
On Tue, Nov 27,
Setup: C* 1.1.6, 6 node (Linux, 64GB RAM, 16 Core CPU, 2x512 SSD), RF=3, 1.65TB
total used
Background: Client app is off - no reads/writes happening. Doing some cluster
maintenance requiring node repairs and upgradesstables.
I've been playing around with trying to figure out what is making
Unless I'm misreading the git history, the stack trace you referenced isn't
from 1.1.2. In particular, the writeHintForMutation method in
StorageProxy.java wasn't added to the codebase until September 9th (
Hi,
I'm aware that this has been a frequent question, but answers are still
hard to find: what's an appropriate Java high-level client?
I actually believe that the lack of a single maintained Java API that is
packaged with Cassandra is quite an issue. The way the situation is
right now, new users
I use hector-client master, which is pretty stable right now.
It uses the latest thrift, so you can use hector with thrift 0.9.0.
That's assuming you don't mind using the active development branch.
On Tue, Nov 27, 2012 at 10:36 AM, Carsten Schnober
schno...@ids-mannheim.de wrote:
Hi,
I'm
I am biased of course but you can find plenty of documentation on playorm
here
https://github.com/deanhiller/playorm/wiki
It uses astyanax because of the better node knowledge. Also feel free to
post questions on stackoverflow as we heavily monitor stack overflow and
are notified every hour of
Am 27.11.2012 16:40, schrieb Peter Lin:
Hi Peter,
thanks for your prompt reply!
I use hector-client master, which is pretty stable right now.
Please excuse my ignorance, but just to be sure I'd like to ask: does
hector-client master differ from the Hector client linked from the
Cassandra Wiki
I could be wrong, but the most recent release is against cassandra 1.0.x
master tracks against cassandra 1.1.x
I've contributed a few patches related to CQL3 the last few weeks and
master seems stable to me. for the record, I don't work for DataStax
so it's just my opinion. I needed the
Netflix has a great client
https://github.com/Netflix/astyanax
On 11/27/12 7:40 AM, Peter Lin wool...@gmail.com wrote:
I use hector-client master, which is pretty stable right now.
It uses the latest thrift, so you can use hector with thrift 0.9.0.
That's assuming you don't mind using the
So I've had a look at Kundera and at Easy-Cassandra. Both seem to lack a
real documentation beyond the examples available in their Github
repositories, right?
Vivek Could you please share what exactly you looking for documentation
and not present. I suggest you to join
*because
*which
*be
*with
Please see:
http://en.wikipedia.org/wiki/Codd's_12_rules
http://wiki.apache.org/cassandra/DataModel
That should get you going for your school report. If you have more
specific questions about terms on the wiki please feel free to ask.
On 11/27/12 4:02 AM,
Hi,
I have a serious problem with counters performance and I can't seem to
figure it out.
Basically I'm building a system for accumulating some statistics on the
fly via Cassandra distributed counters. For this I need counter updates to
work really fast and herein lies my problem -- as soon as I
Hector does not require an outdated version of thift, you are likely using
an outdated version of hector.
Here is the long and short of it: If the thrift thrift API changes then
hector can have compatibility issues. This happens from time to time. The
main methods like get() and insert() have
Hi Sergey,
I know I've had similar issues with counters which were bottle-necked by
network throughput. You might be seeing a problem with throughput between
the clients and Cass or between the two Cass nodes. It might not be your
case, but that was what happened to me :-)
Juan
On Tue, Nov
Hi Juan,
thanks for your input!
In my case, however, I doubt this is the case -- clients are able to push
many more updates than I need to saturate replication_factor=2 case (e.g.
I'm doing as many as 6x more increments when testing 2-node cluster with
replication_factor=1), so bandwidth between
Are you writing with QUORUM consistency or ONE?
On 11/27/12 9:52 AM, Sergey Olefir solf.li...@gmail.com wrote:
Hi Juan,
thanks for your input!
In my case, however, I doubt this is the case -- clients are able to push
many more updates than I need to saturate replication_factor=2 case (e.g.
I'm
I'm using ONE like this (Hector):
ConfigurableConsistencyLevel consistencyLevel = new
ConfigurableConsistencyLevel();
consistencyLevel.setDefaultReadConsistencyLevel(HConsistencyLevel.ONE);
consistencyLevel.setDefaultWriteConsistencyLevel(HConsistencyLevel.ONE);
--
View this message in
I'm using ONE like this (Java, Hector):
ConsistencyLevel consistencyLevel = new ConfigurableConsistencyLevel();
consistencyLevel.setDefaultReadConsistencyLevel(HConsistencyLevel.ONE);
consistencyLevel.setDefaultWriteConsistencyLevel(HConsistencyLevel.ONE);
Michael Kjellman wrote
Are you
FYI,
We are using Hector 1.0-5 which comes with cassandra-thrift 1.09 - libthrift
0.6.1. It can work with Cassandra 1.1.6.
Totally agree it's a pain to deal with different version of libthrift. We use
scribe for logging, a bit messy over there.
Thanks.
-Wei
Do you really require page numbers? I usually find them annoying while
paging through a forum, especially if it is quite active. Threads from the
bottom of the page get bumped to the next page so you end up seeing the
same content again. I much prefer the first page being the current N
results,
Well I know what you mean and i have been doing that however im currently
migrating an old mysql site onto cass and just trying to keep things consistent
on the front end for the guy, i thought i might be missing a trick but if not
then yeah I may well ditch the page linkage if it starts
I'm not sure I always
understand what people mean by schema less
exactly and I'm curious.
For 'schema less', given this -
{{{
cqlsh use example;
cqlsh:example CREATE TABLE users (
... user_name varchar,
... password varchar,
... gender varchar,
... session_token varchar,
... state
The difference between Replication factor =1 and replication factor 1 is
significant. Also it sounds like your cluster is 2 node so going from RF=1
to RF=2 means double the load on both nodes.
You may want to experiment with the very dangerous column family attribute:
- replicate_on_write:
You can do something like this:
Divide your nodes up into 4 datacenters art1,art2,art3,core
[default@unknown] create keyspace art1 placement_strategy =
'org.apache.cassandra.locator.NetworkTopologyStrategy' and
strategy_options=[{art1:2,core:2}];
[default@unknown] create keyspace art2
We're having a similar performance problem. Setting
'replicate_on_write: false' fixes the performance issue in our tests.
How dangerous is it? What exactly could go wrong?
On 12-11-27 01:44 PM, Edward Capriolo wrote:
The difference between Replication factor =1 and replication factor
1 is
I mispoke really. It is not dangerous you just have to understand what it
means. this jira discusses it.
https://issues.apache.org/jira/browse/CASSANDRA-3868
On Tue, Nov 27, 2012 at 6:13 PM, Scott McKay sco...@mailchannels.comwrote:
We're having a similar performance problem. Setting
Hi, thanks for your suggestions.
Regarding replicate=2 vs replicate=1 performance: I expected that below
configurations will have similar performance:
- single node, replicate = 1
- two nodes, replicate = 2 (okay, this probably should be a bit slower due
to additional overhead).
However what I'm
Cassandra's counters read on increment. Additionally they are distributed
so that can be multiple reads on increment. If they are not fast enough and
you have avoided all tuning options add more servers to handle the load.
In many cases incrementing the same counter n times can be avoided.
By the way the other issues you are seeing with replicate on write at false
could be because you did not repair. You should do that when changing rf.
On Tuesday, November 27, 2012, Edward Capriolo edlinuxg...@gmail.com
wrote:
Cassandra's counters read on increment. Additionally they are
I already do a lot of in-memory aggregation before writing to Cassandra.
The question here is what is wrong with Cassandra (or its configuration)
that causes huge performance drop when moving from 1-replication to
2-replication for counters -- and more importantly how to resolve the
problem.
Thank you. This is a good start I was beginning to think it couldn't be done.
When I run the command I get the error
syntax error at position 21: missing EOF at 'placement_strategy'
that is probably because I still need to set the correct properties in the conf
files
On November 27, 2012
Say you are doing 100 inserts rf1 on two nodes. That is 50 inserts a node.
If you go to rf2 that is 100 inserts a node. If you were at 75 % capacity
on each mode your now at 150% which is not possible so things bog down.
To figure out what is going on we would need to see tpstat, iostat , and
My mistake that is older cli syntax, I wad just showing the concept set up
4 datacenter and selectively replicate keyspaces between them.
On Tuesday, November 27, 2012, jer...@simpleartmarketing.com
jer...@simpleartmarketing.com wrote:
Thank you. This is a good start I was beginning to think
@Bill
Are you saying that now cassandra is less schema less ? :)
Compact storage is the schemaless of old.
On Tuesday, November 27, 2012, Bill de hÓra b...@dehora.net wrote:
I'm not sure I always
understand what people mean by schema less
exactly and I'm curious.
For 'schema less', given
Do you have the error stack ?
Cheers
-
Aaron Morton
Freelance Cassandra Developer
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 28/11/2012, at 12:28 AM, Everton Lima peitin.inu...@gmail.com wrote:
Hello people.
I was using cassandra 1.1.6 and use the Object
I've been playing around with trying to figure out what is making compactions
run so slow.
Is this regular compaction or table upgrades ?
I *think* upgrade tables is single threaded.
Do you have some compaction logs lines that say Compacted to…? It's handy to
see the throughput and the
Hello,
I was wondering if anyone had an answer to my previous message below.
Seems another is having the same problem, but unfortunately with no response as
well.
http://mail-archives.apache.org/mod_mbox/cassandra-user/201211.mbox/%3c509a4a1f.8070...@semantico.com%3E
Any help
Hi,
Even when setting it to 32m in cassandra.yaml (and restarting Cassandra), the
same problem emerges -- its as if Cassandra doesn't register the update (its
always locked at 16mb). And I know that Cassandra is reading the property from
cassandra.yaml because if I do -1, it complains saying
On Tue, Nov 27, 2012 at 8:16 PM, Yiming Sun yiming@gmail.com wrote:
Hello,
but it is not clear to me where this setting belongs to, because even in the
v1.1.6 conf/cassandra.yaml, there is no such property, and apparently
adding this property to the yaml causes a fatal configuration
Can someone please help me with this or share your experiences if you have
tried this before please?
From: Naveen Reddy naveen_2...@yahoo.co.in
To: user@cassandra.apache.org user@cassandra.apache.org
Sent: Monday, 26 November 2012 4:24 PM
Subject: Hive on
Hi Bryan,
Thank you very much for this information. So in other words, the settings
such as row_cache_size_in_mb in YAML alone are not enough, and I must also
specify the caching attribute on a per column family basis?
-- Y.
On Tue, Nov 27, 2012 at 11:57 PM, Bryan Talbot
Also, what command can I used to see the caching setting? DESC TABLE
cf doesn't list caching at all. Thanks.
-- Y.
On Wed, Nov 28, 2012 at 12:15 AM, Yiming Sun yiming@gmail.com wrote:
Hi Bryan,
Thank you very much for this information. So in other words, the settings
such as
I think there might be a misunderstanding as to the nature of the problem.
Say, I have test set T. And I have two identical servers A and B.
- I tested that server A (singly) is able to handle load of T.
- I tested that server B (singly) is able to handle load of T.
- I then join A and B in the
Use cassandracli.
Thanks.
-Wei
Sent from my Samsung smartphone on ATT
Original message
Subject: Re: need some help with row cache
From: Yiming Sun yiming@gmail.com
To: user@cassandra.apache.org
CC:
Also, what command can I used to see the caching setting? DESC
Hi.
After updating Cassandra from 1.1.5 to 1.1.6. Every schema updates ends with
strange error exception in system.log and I must to restart nodes in cluster
for whom `describe cluster` says that nodes are unreachable.
Neither `nodetool repair` or `nodetool upgragesstables` doesn't help. Only
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