I think you can download the log files now.
I am using mmap, at the same time, I use hugepages, so that the jvm
heap won't be swapped out, I also swapoff my swap partition According
to the
https://issues.apache.org/jira/browse/CASSANDRA-1214.
I enlarge the memtable threshold I want to reduce the fr
Hi all,
I just tried to bootstrap a new server into an existed cluster of 3 servers.
Set up a bootstrapping mode on a new server, I put it in a cluster.
After 1'30" + 30"sleep I ran "nodetool cleanup" on neighbour servers,
and saw the status with "nodetool streams".
But the result was "not sen
The output of htop shows threads as procs with a breakdown of how much cpu
/etc per thread (in ncurses color!). All of these Java "procs" are just Java
threads of only 1 instance of Cassandra per Server.
On Sat, Jul 31, 2010 at 3:45 PM, Benjamin Black wrote:
> Sorry, I just noticed: are you runn
Just guessing here, but your mem table settings are very high compared to the defaults (64MB and 0.3 Million). It may be that flushing 1GB of mem table data is taking a while. You may also want to look at the FlushDataBufferSizeInMB and FlushIndexBufferSizeInMB settings in storage-conf.xml.Is the
Hi,
I have a 4-node cassandra cluster. And I find when the 4 nodes are
flushing memtable and gc at the very similar moment, the throughput
will drop and latency will increase rapidly and the nodes are dead and
up frequently
You could download the IOPS variance of data disk (sda here) and
sy
Thanks for the link but that doesn't answer my question. I happen to know
quite allot about tuning Linux/Solaris/*NIX. I'm trying to figure out the
limits in cassandra, when it breaks, and why.
So, anyone know of or published benchmarks on messing with these values?
On Tue, Aug 3, 2010 at 7:08 PM
You need to find out where your bottleneck is, before you start trying
to mitigate it. Some good first steps are at
http://spyced.blogspot.com/2010/01/linux-performance-basics.html
On Tue, Aug 3, 2010 at 9:03 PM, Dathan Pattishall wrote:
> Do reads at high concurrency get a boost if I where to r
You're right... I missed posting crash log.
I was too busy and under press of business at that time. Please understand.
These are head and tail of the JVM crash log when it stopped :
--- T H R E A D ---
Current thread (0x002ca9903400): JavaThread "COMPACTION-POOL:1
Do reads at high concurrency get a boost if I where to raise this value?
8
32
Any benchmarks/reports showing a good sweet spot per CPU core?
FYI, the Cassandra Ubuntu PPA has been updated to v0.6.4
Please see
https://launchpad.net/~cassandra-ubuntu/+archive/stable
For more information.
On Jul 30, 2010, at 10:02 PM, Eric Evans wrote:
>
> Another month and the 0.6 branch is a month better. The 0.6.4 release
> has a number of import
Under 0.6.* you need to alter the storage-conf.xml and restart the node. You can do this as a rolling restart in the cluster. Under 0.7* you can make dynamic changes to the storage config through the API. If your experimenting perhaps you could grab the source code for 0.7 and give it a try. I thin
On Fri, Jul 30, 2010 at 9:58 AM, osishkin osishkin wrote:
> I'm talking about the James Golick plugin. I followed the
> instructions, and got nowhere.
> http://github.com/jamesgolick/cassandra-munin-plugins
> I saw in the mailing list that other people successfully got it to work
>
>
I'm pretty su
I've got standard storage config from Cassandra package, all directories
exists with properly permissions.
Maciek
From: atin sood [mailto:atins...@gmail.com]
Sent: Tuesday, August 03, 2010 4:59 PM
To: user@cassandra.apache.org
Subject: Re: unable to start cassandra
I am not sure but c
We just started using Cassandra 0.6.4 yesterday for simple logging of a
particular action. This is pretty much experimental for us at this stage
so we only have 1 node up and running (no gasps please). My question is
how can I add another column family (ie alter storage-conf.xml) without
disrup
Yes this is the issue. Thanks.
Dave
On Tuesday, August 3, 2010, Jonathan Ellis wrote:
> Sounds like https://issues.apache.org/jira/browse/THRIFT-638, where
> Arya Goudarzi posted a patch.
>
> On Tue, Aug 3, 2010 at 5:18 AM, Dave Gardner wrote:
>> Hi all
>>
>> I'm working on a PHP/Cassandra appl
Something like http://carbonado.sourceforge.net/index.html Carbonado would
also be cool. I'm not sure how JPA's relations would work on a de-normalized
form like Cassandra.
--
View this message in context:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Chirper-Open-source-NET
Does the JPA adapter affect performance? It would be nice to see what
overhead (if any) it adds.
Looks cool though!
--
View this message in context:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Chirper-Open-source-NET-webapp-with-Cassandra-backend-tp5358052p5369266.html
Sent
Thanks for the anwser.
We started cassandra with 1 Gbyte of memory ... but on a machine with
only 256 Mbytes of memory. Seems that it was the problem. We added
memory on the server and it seems to be better.
Regards.
Jean-Yves
On Mon, Aug 2, 2010 at 9:31 PM, Jonathan Ellis wrote:
> Sounds a
Thanks for the report Arya! I've opened
https://issues.apache.org/jira/browse/CASSANDRA-1351 to take care of this.
-Original Message-
From: "Arya Goudarzi"
Sent: Friday, July 30, 2010 5:17pm
To: user@cassandra.apache.org
Cc: stu.h...@rackspace.com
Subject: Re: Avro Runtime Exception Bad
Thanx for the insight
On Mon, Aug 2, 2010 at 4:48 PM, Benjamin Black wrote:
> you have insufficient i/o bandwidth and are seeing reads suffer due to
> competition from memtable flushes and compaction. adding additional
> nodes will help some, but i recommend increasing the disk i/o
> bandwidth,
On Tue, Aug 3, 2010 at 11:44 AM, Edward Capriolo wrote:
> On Tue, Aug 3, 2010 at 10:47 AM, Maciej Lisowski
> wrote:
>> Hi all,
>>
>> I’m new here and new with Cassandra and I’ve got problem to run it (v.
>> 0.6.4) with jdk1.6.0_21.
>>
>> When I type “cassandra” to run it I get error:
>>
>>
>>
>>
On Tue, Aug 3, 2010 at 10:47 AM, Maciej Lisowski
wrote:
> Hi all,
>
> I’m new here and new with Cassandra and I’ve got problem to run it (v.
> 0.6.4) with jdk1.6.0_21.
>
> When I type “cassandra” to run it I get error:
>
>
>
> ERROR 16:23:53,803 Uncaught exception in thread
> Thread[ROW-MUTATION-S
I am not sure but can you please attach your storage.conf file.. that might
help in debugging
I guess s.th is messed up in the column families described in the storage
conf.. did you change the storage.conf that comes with the install
On Tue, Aug 3, 2010 at 8:17 PM, Maciej Lisowski wrote:
> Hi
Hi all,
I'm new here and new with Cassandra and I've got problem to run it (v.
0.6.4) with jdk1.6.0_21.
When I type "cassandra" to run it I get error:
ERROR 16:23:53,803 Uncaught exception in thread
Thread[ROW-MUTATION-STAGE:5,5,main]
java.util.concurrent.ExecutionException: java.lang.Runt
Sounds like https://issues.apache.org/jira/browse/THRIFT-638, where
Arya Goudarzi posted a patch.
On Tue, Aug 3, 2010 at 5:18 AM, Dave Gardner wrote:
> Hi all
>
> I'm working on a PHP/Cassandra application. Yesterday we experienced a
> strange situation when testing random reads. The background t
If you have a crash log you should post at least the header rather
than playing 20 questions with us. But if it's not OOM then it's
likely to be a bug in the JVM, so upgrading is probably your best
option.
On Tue, Aug 3, 2010 at 3:49 AM, Ilun Ahn wrote:
> No, I don't think the direct cause is ou
As you might guess, setting initial_token in the yaml works.
On Tue, Aug 3, 2010 at 3:02 AM, Viktor Jevdokimov
wrote:
> Hi,
>
>
>
> I’ve missed how to set initial token in 0.7 (trunk) version – there’s no
> initial token in cassandra.yaml
>
>
>
> Viktor
--
Jonathan Ellis
Project Chair, Apache
Thank you very much for those impulses. I see, that I'm still thinking
to much in RDMS.
I'll try thoses out.
Stefan
On Tue, Aug 3, 2010 at 11:44 AM, Aaron Morton wrote:
> As Justus said, you need to consider the way you want to get the data back
> and then denormalise to suit. Do you need to sup
I don't have Python or Ruby. How does that work?
Do I have to install one of those languages and the Cassandra client, or is
there some tool that I can download?
On Tue, Aug 3, 2010 at 2:52 AM, Benjamin Black wrote:
> Yes, python or ruby from the command line. The CLI is not useful.
>
> On Mon
As Justus said, you need to consider the way you want to get the data back and then denormalise to suit. Do you need to support ad-hoc queries or will you know how you want to query ahead of time?Some different approaches may beStandard CF to hold the measurements taken, grouped by day{device_id/20
Hi all
I'm working on a PHP/Cassandra application. Yesterday we experienced a
strange situation when testing random reads. The background to this test was
that we inserted 10,000 rows with simple row keys. The number of columns in
each row varies between about 5 columns and 40 columns (all random)
No, I don't think the direct cause is out of heap space. It didn't left any
heap dump file with the option -XX:+HeapDumpOnOutOfMemoryError.
My system.log for the last minute is as follows(many GC occurs):
INFO [HINTED-HANDOFF-POOL:1] 2010-08-02 20:33:50,254
HintedHandOffManager.java (line 153) St
2010/8/2 Peter Schuller
> > First, Cassandra suddenly dies during compaction. Java core dump says
> that
> > the last thread run was "COMPACTION-POOL:1".
> > I suspect that my business logic could lead size of columns in a column
> > family per a row to be greater than two gigabytes. (but i coul
It sounds to me that it's an good idea to use Cassandra in your case, I figure
I help you as we Europeans need to cooperate some even though I only worked
with Cassandra for a month. =)
1:
What is the query you want to use when charting the data? Use it to decide how
to storage and sort your da
Dear Cassandra Users,
I'm quite new to Cassandra and I'm still trying to figure out, if I'm
on the right path for my requirements.
I like to explain my Cassandra design and hope to receive feedback, if
this would work.
I like to use Cassandra to store measurement data from several
devices. Each d
Hi,
I've missed how to set initial token in 0.7 (trunk) version - there's no
initial token in cassandra.yaml
Viktor
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