If you have a multinode cluster, which node you should connect to fetch
data?
Is there a master node in a cluster which accepts data request and dispatch
it? Or every node in the cluster is completely same?
If all nodes are same in a cluster, should client connect to random node to
reduce cassand
?? 2010-06-01 15:00 +0800??huajun qi??
> If you have a multinode cluster, which node you should connect to
> fetch data?
any one.
>
> Is there a master node in a cluster which accepts data request and
> dispatch it? Or every node in the cluster is completely same?
no master. all the same.
谢谢
xavier manach tekio.org> writes:
>
> Hi. I search informations for basic tunning of memory in Cassandra.My
situation : I started to test larges imports of data in Cassandra 6.1.My first
import worked fine : 100 Millions row in 2 hours ~ around 1 insert row by
seconds
> My second is slower
As I told you on IRC channel dont go for shortcuts ...learn java
first.
___
Vineet Daniel
___
Let your email find you
On Tue, Jun 1, 2010 at 11:47 AM, Sagar Agrawal wrote:
> Thanks Vineet for replying, but I am
Hi all,
I'm testing writing speed of cassandra with 4 servers. I'm confused by
the behavior of cassandra.
---env---
load-data app written in c++, using libcassandra (w/ modified batch
insert)
20 writing threads in 2 processes running on 2 servers
---optimization---
1.turn log level to INFO
2.JVM
Perfect :) I test it.
I didn't open this file before. I did think the configuration only was in
the foloder conf.
I am not a specialist java. I will search about the meaning of JVM
parameters.
For now, I read this page for undertand the others options of JVM :
http://java.sun.com/performance/r
Hi all,
I don't quite understand the usage of 'class SlicePredicate' when trying
to retrieve a ranged slice.
How should it be initialized?
Thanks!
--
Kevin Yuan
www.yuan-shuai.info
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
It needs a SliceRange. For example:
SliceRange range = new SliceRange(); range.setStart("".getBytes());
range.setFinish("".getBytes()); range.setReversed(true); range.setCount(20);
SlicePredicate sp = new SlicePredicate(); sp.setSlice_range(range);
client.get_slice(KEYSPACE, KEY, ColumnParent, sp,
Does it work whatever the chosen partionner?
Or only for OrderPreservingPartitionner ?
On Tuesday, June 1, 2010, Eric Yu wrote:
> It needs a SliceRange. For example:
> SliceRange range = new SliceRange();
> range.setStart("".getBytes());
> range.setFinish("".getBytes());
> range.setReversed(true)
Hi, It would be better if we know which Consistency Level did you choose,
and what is the schema of test data?
在 2010年6月1日 下午4:48，Shuai Yuan 写道：
> Hi all,
>
> I'm testing writing speed of cassandra with 4 servers. I'm confused by
> the behavior of cassandra.
>
> ---env---
> load-data app written
Hi,
Is there a way to skip corrupted rows when doing compaction?
We are currently deploying 2 nodes with replicationfactor=2 but one node
reports lots of exceptions like java.io.UTFDataFormatException: malformed
input around byte 72. My guess is that some of the data in the SSTable is
corrupted b
Hi,ALL
I found that most applications on Cassandra are for web applications,
such as store friiend information or digg information, and they get good
performance, many companies or groups want to move their applications to
Cassandra, so which kind of applications are Cassandra fit for? Thank
I'm saying that .99 is getting a copy of all the data for which .124
is the primary. (If you are using RackUnawarePartitioner. If you are
using RackAware it is some other node.)
On Tue, Jun 1, 2010 at 1:25 AM, Ran Tavory wrote:
> ok, let me try and translate your answer ;)
> Are you saying that
http://wiki.apache.org/cassandra/FAQ#node_clients_connect_to
On Tue, Jun 1, 2010 at 2:00 AM, huajun qi wrote:
> If you have a multinode cluster, which node you should connect to fetch
> data?
> Is there a master node in a cluster which accepts data request and dispatch
> it? Or every node in the
If you're on a version earlier than 0.6.1, you might be running into
https://issues.apache.org/jira/browse/CASSANDRA-866. Upgrading will
fix it, you don't need to reload data.
It's also worth trying 0.6.2 and DiskAccessMode=standard, in case
you've found another similar bug.
On Tue, Jun 1, 2010
The applications which require bigger storage and fast response for
retrieval.
On Tue, Jun 1, 2010 at 6:13 PM, 史英杰 wrote:
> Hi,ALL
> I found that most applications on Cassandra are for web applications,
> such as store friiend information or digg information, and they get good
> performanc
Thanks, but would you please describe it in more details, because most
applications require fast response for retrieval.
2010/6/1 sharanabasava raddi
> The applications which require bigger storage and fast response for
> retrieval.
>
>
> On Tue, Jun 1, 2010 at 6:13 PM, 史英杰 wrote:
>
>> Hi,ALL
1. Performance data of network storage elements which may be required for
performance tuning.
2. Data dictionaries.
3. Satellite communications.
4. General search applications.
etc.
below is the performance statistics compared to traditional Databases.
MySQL Comparison
*MySQL > 50 GB Data
Wr
Thanks, Jonathan
I'm using 0.6.1
And another thing is that I get lots of zero-sized tmp files in the data
directory.
When I restarted cassandra those tmp files will be deleted then new empty
tmp files will be generated gradually, while still lots
of UTFDataFormatException in the system.log
Using
(cross-posted from http://groups.google.com/group/rubber-ec2, apologies)
Cassandra support got added recently to
http://github.com/wr0ngway/rubber (yay!). Is anyone else using it?
I updated the install script to use the published apache repo and will
plan on getting this up to github with a pull
Are stats exposed over JMX for compaction? I'm trying to see when a node is
in compaction, and guess when it will complete. tpstats doesn't show
anything but the process is using lots of CPU time... I was wondering if
there's a better view on compaction besides looking backwards in the
system.log
Hi Ian,
On Tue, Jun 1, 2010 at 9:27 AM, Ian Soboroff wrote:
> Are stats exposed over JMX for compaction?
You can view them via the
org.apache.cassandra.db:type=CompactionManager MBean. The PendingTasks
attribute might suit you best.
Cheers,
Dylan.
Thanks. Are folks open to exposing this via nodetool? I've been trying to
figure out a decent way to aggregate and expose all this information that is
easier than nodetool and less noisy than nagios... suggestions appreciated.
(My cluster only exposes a master node and everything else is private
Regarding compaction thresholds... the BMT example says to set the threshold
to 0 during an import. Is this advisable during any bulk import (say using
batch mutations or just lots and lots of thrift inserts)?
Also, when I asked "are folks open to..." I meant that I'm happy to code a
patch if any
Hi Ian,
On Tue, Jun 1, 2010 at 9:41 AM, Ian Soboroff wrote:
> Thanks. Are folks open to exposing this via nodetool? I've been trying to
> figure out a decent way to aggregate and expose all this information that is
> easier than nodetool and less noisy than nagios... suggestions appreciated.
Y
On Mon, 2010-05-24 at 17:04 -0500, Eric Evans wrote:
> For those interested in Cassandra training, I'll be giving a 3-hour
> tutorial[1] at OSCON this year entitled Hands-on Cassandra.
>
> [1]: http://www.oscon.com/oscon2010/public/schedule/detail/14283
>
> The tutorial will cover setup, configur
I'm using RackAwareStrategy. But it still doesn't make sense I think...
let's see what did I miss...
According to http://wiki.apache.org/cassandra/Operations
-
RackAwareStrategy: replica 2 is placed in the first node along the ring
the belongs in *another* data center than the first; th
Depending on the key, the request would have been proxied to the first
or second node.
The CLI uses a consistency level of "ONE", meaning that only a single
node's data would have been considered when you get().
Also, the responsible nodes for a given key are mapped accordingly at
request time, and
Also, what are you meaning specifically by 'slow'? Which measurements
are you looking at. What are your baseline constraints for your test
system?
2010/6/1 史英杰 :
> Hi, It would be better if we know which Consistency Level did you choose,
> and what is the schema of test data?
>
> 在 2010年6月1日 下午4:
My nodes have 5 disks and are using them separately as data disks. The
usage on the disks is not uniform, and one is nearly full. Is there some
way to manually balance the files across the disks? Pretty much anything
done via nodetool incurs an anticompaction with obviously fails. system/ is
no
There is no easy answer to this. The requirements vary widely even
within a particular "type" of application.
If you have a list of specific requirements for a given application,
it is easier to say whether it is a good fit.
If you need a schema marshaling system, then you will have to build it
in
On 01.06.2010 15:32, sharanabasava raddi wrote:
1. Performance data of network storage elements which may be required
for performance tuning.
2. Data dictionaries.
3. Satellite communications.
4. General search applications.
etc.
below is the performance statistics compared to traditional Da
Hi all, I'm using Hector framework to interact with Cassandra and at trying
to handle failover more effectively I found it a bit complicated to fetch
all cassandra nodes that are up and running.
My goal is to keep an up-to-date list of active/up Cassandra servers to
provide HEctor every time I nee
Hello,
We're running a 4 node cluster on beefy EC2 virtual instances (8 core, 32
GB) using EBS storage with 8 GB of heap allocated to the JVM.
Every couple of hours, each of the nodes does a concurrent mark/sweep that
takes around 30 seconds to complete. During that GC, the node temporarily
dro
?? 2010-06-01 15:00 -0500??Jonathan Shook??
> Also, what are you meaning specifically by 'slow'? Which measurements
> are you looking at. What are your baseline constraints for your test
> system?
>
Actually, the problem is the utilizaton of resources(for a single
machine):
CPU: 700% / 160
MEM: almost 100% (16GB)
-
maybe this is the bottleneck.
writing concerns Memtable and SSTable in memory.
在 2010年6月2日 上午9:48，Shuai Yuan 写道：
> 在 2010-06-01二的 15:00 -0500，Jonathan Shook写道：
> > Also, what are you meaning specifically by 'slow'? Which measurements
> > are you looking a
Thanks lwl.
Then is there anyway of tuning this, faster flush to disk or else?
Cheers,
Kevin
?? 2010-06-02 09:57 +0800??lwl??
> MEM: almost 100% (16GB)
> -
> maybe this is the bottleneck.
> writing concerns Memtable and SSTable in memory.
>
> ?? 2010??6??2?? 9:48??S
I have a pretty simple data modeling question. I don't know whether or not to
use a CF or SCF in one instance.
Here's my example. I have an Store entry and locations for each store. So I
have something like:
Using CF:
Store { //CF
storeId { //row key
storeName:str,
storeLogo:i
is all the 4 servers' MEM almost 100%?
在 2010年6月2日 上午10:12，Shuai Yuan 写道：
> Thanks lwl.
>
> Then is there anyway of tuning this, faster flush to disk or else?
>
> Cheers,
>
> Kevin
>
> 在 2010-06-02三的 09:57 +0800，lwl写道：
> > MEM: almost 100% (16GB)
> > -
> > maybe this is the bottl
?? 2010-06-02 10:37 +0800??lwl??
> is all the 4 servers' MEM almost 100%?
Yes
> ?? 2010??6??2?? 10:12??Shuai Yuan ??
>
> Thanks lwl.
>
> Then is there anyway of tuning this, faster flush to disk or
> else?
>
> Cheers,
>
Hi,
I'm testing several read operations(get, get_slice, get_count, etc.) with
various ConsistencyLevel and noticed that ConsistencyLevel.ALL is
"not yet supported" in most of read ops (other than get_range_slice).
I've looked up code in StorageProxy#readProtocol and it seems
to be able to handle
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