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" :
>> is it expectable behaviour? or it's bug?
> It exhibits bug like qualities.
>
> Can you create a ticket on https://issues.apache.org/j
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, 2
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 compa
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 (
https://git-wip-us.apache.org/repos/asf?p=cassandra.git;a=commitdiff;h=b38ca2879cf1cbf5de1
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 h
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
wrote:
> Hi,
> I'm aware that this has been a
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 Wik
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 functiona
Netflix has a great client
https://github.com/Netflix/astyanax
On 11/27/12 7:40 AM, "Peter Lin" 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 active developme
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?
Could you please share what exactly you looking for documentation
and not present. I suggest you to join
http://groups.google.com/group/ku
*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, "davuk...@vel
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 a
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 rema
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 27
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" 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 doing as ma
I'm using ONE like this (Hector):
ConfigurableConsistencyLevel consistencyLevel = new
ConfigurableConsistencyLevel();
consistencyLevel.setDefaultReadConsistencyLevel(HConsistencyLevel.ONE);
consistencyLevel.setDefaultWriteConsistencyLevel(HConsistencyLevel.ONE);
--
View this message in context
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 writin
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
F
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, and
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 causin
> 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: Repl
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 placement_
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 wrote:
> We're having a similar performance problem. Setting 'replicate_on_write:
> false'
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.
Twitte
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
wrote:
>
> Cassandra's counters read on increment. Additionally they are distributed
so that can be m
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. 2x-3x
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 at
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
top
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 thin
@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 wrote:
>> I'm not sure I always
>> understand what people mean by "schema less"
>> exactly and I'm curious.
>
> For 'schema less', given this -
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 wrote:
> Hello people.
> I was using cassandra 1.1.6 and use the Object CassandraServer() to create
> 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 n
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 it
On Tue, Nov 27, 2012 at 8:16 PM, Yiming Sun 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 error upon
> server
Can someone please help me with this or share your experiences if you have
tried this before please?
From: Naveen Reddy
To: "user@cassandra.apache.org"
Sent: Monday, 26 November 2012 4:24 PM
Subject: Hive on Cassandra : issues in setup
Hi,
I am trying t
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 wrote:
> On Tue, Nov
Also, what command can I used to see the "caching" setting? "DESC TABLE
" doesn't list caching at all. Thanks.
-- Y.
On Wed, Nov 28, 2012 at 12:15 AM, Yiming Sun wrote:
> Hi Bryan,
>
> Thank you very much for this information. So in other words, the settings
> such as row_cache_size_in_mb i
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 cl
Use cassandracli.
Thanks.
-Wei
Sent from my Samsung smartphone on AT&T
Original message
Subject: Re: need some help with row cache
From: Yiming Sun
To: user@cassandra.apache.org
CC:
Also, what command can I used to see the "caching" setting? "DESC TABLE "
doesn't list
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
d
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