maybe that should be the first wiki update the TODO
On Tue, Oct 11, 2011 at 7:21 AM, Maki Watanabe wrote:
> Hello aaron,
> I raise my hand too.
> If you have to-do list about the wiki, please let us know.
>
> maki
>
We already have two separate rings. Idea of bidirectional sync is, if one
ring is down, we can still send the traffic to other ring. When original
cluster comes back, it will pick up the data from available cluster. I'm not
sure if it makes sense to have separate rings or combine these two rings
in
Hello aaron,
I raise my hand too.
If you have to-do list about the wiki, please let us know.
maki
2011/10/10 aaron morton :
> Hi there,
> The dev's have been very busy and Cassandra 1.0 is just around the corner
> and full of new features. To celebrate I'm trying to give the wiki some
> loving t
Why have two rings? Cassandra manages the replication for youone ring
with physical nodes in two dc might be a better option. Of course, depending
on the inter-dc failure characteristics, might need to endure split-brain
for a while.
/***
sent from my android...please pardo
I am trying to understand multi DC setup for cassandra. As I understand, in
this setup, replicas exists in same cluster ring, but physically nodes are
distributed across DCs. Is this correct?
I have two different cluster rings in two DCs, and want to replicate data
bidirectionally. They both have
I am using commodity hardware so even minor compact make disk io goes 100%
and server load get very high
On Tue, Oct 11, 2011 at 11:19 AM, Yan Chunlu wrote:
> so how about disk io? is there anyway to use ionice to control it?
>
> I have tried to adjust the priority by "ionice -c3 -p [cassandra
so how about disk io? is there anyway to use ionice to control it?
I have tried to adjust the priority by "ionice -c3 -p [cassandra pid].
seems not working...
On Wed, Sep 28, 2011 at 12:02 AM, Peter Schuller <
peter.schul...@infidyne.com> wrote:
> > I saw the ticket about compaction throttling
By default, Cassandra is configured to use half the ram of your
system. That's way overkill for playing around with it on a laptop.
Edit /etc/cassandra/cassandra-env.sh and set max_heap_size_in_mb to
something more suited for your environment.
I have it set to 256M for my laptop (with 4G of ram).
Hector's IndexedSlicesQuery has a setRowCount method that you can use to
page through the results, as described in
https://github.com/rantav/hector/wiki/User-Guide .
rangeSlicesQuery.setRowCount(1001);
.
rangeSlicesQuery.setKeys(lastRow.getKey(), "");
Is it efficient? Spe
Hi Aaron,
normally we use hector to access cassandra, but for debugging I switched
to cassandra-cli.
Column can not be read by a simple
get CFName['rowkey']['colname'];
Response is "Value was not found"
if i query another column, everything is just fine.
Serverlog for unsuccessful read (keyspac
Thanks, Hani.
If you would like to update the storage config page that would be
handy. Just update http://wiki.apache.org/cassandra/FrontPage_draft_aaron/ to
say you are working on it. Just click the login link at the top to setup an
account.
wrt setting up eclipse, perhaps yo
hope this is not off topic?
we've been struggling following ostensible procedures for awhile now,
ready to pony up for some pro help (but not quite ready to pony up for
datastax). please contact me at svd at mylife dot com if you are
interested.
-scott
I'm running an underpowered laptop (ubuntu) for development work. Installing
Cassandra was easy, and getting the twissandra example app up and working was
also easy.
Here's the problem: after about a day of letting it run (with no load generated
to webapp or db), my laptop now becomes unrespons
It is actually not at the exact same time of the day. It varies but happens
within certain blocks of time, like between 00hr and 02hr. The could be up
for hours or it could crash again in 15 minutes. The memory is fine, just
using a larger footprint than 0.6 in all ways.
On Mon, Oct 10, 2011 at 1:
The service keeps dieing at the same time every day and there is nothing in the
app logs, it's going to be something external.
Sorry but I'm not sure what the problem with the memory usage is. Is the server
running out of memory, or is it experiencing a lot of GC ?
Cheers
-
Aa
How are they unreadable ? You need to go into some details about what is going
wrong.
What sort of read ?
What client ?
What is in the logging on client and server side ?
Try turning the logging up to DEBUG on the server to watch what happens.
Cheers
-
Aaron Morton
Freel
I am out of the office until 10/14/2011.
I am attending conference in Europe and meeting customers and parteners
from 10/10/2011 to 10/15/2011.
They are might be delay in responding the emails. I will try to respond to
email periodically between meetings and some evenings in the local time
zone
On Mon, Oct 10, 2011 at 11:47 AM, Scott Fines wrote:
> Hi all,
> This may be a silly question, but I'm at a bit of a loss, and was hoping for
> some help.
> I have a Cassandra cluster set up with two NICs--one for internel
> communication between cassandra machines (10.1.1.*), and one to respond t
On Mon, Oct 10, 2011 at 11:51 AM, hani elabed wrote:
> Hi Aaron,
> I can help with the documentation... I grabbed tons of screenshots as I was
> installing Cassandra source trunk(1.0.0.rc2?) on my Mac OS X Snow leopard on
> Eclipse Galileo and later Eclipse Indigo, I will be installing it on Eclip
Does it mean you are not updating a row or deleting them? Can you look
at JMX values of
BloomFilter* ?
I don't believe bloom filter false positive % value is configurable.
Someone else might be able to throw more light on this.
I believe if you want to keep disk seeks to 1 ssTable you will need
Hi Aaron,
I can help with the documentation... I grabbed tons of screenshots as I was
installing Cassandra source trunk(1.0.0.rc2?) on my Mac OS X Snow leopard on
Eclipse Galileo and later Eclipse Indigo, I will be installing it on Eclipse
for Ubuntu 10.04 soon. I took the sceenshots after I notic
Hi all,
This may be a silly question, but I'm at a bit of a loss, and was hoping for
some help.
I have a Cassandra cluster set up with two NICs--one for internel communication
between cassandra machines (10.1.1.*), and one to respond to Thrift RPC
(172.28.*.*).
I also have a Hadoop cluster se
Dne 10.10.2011 18:31, Yang napsal(a):
I noticed that 2 of my CFs are showing very different bloom filter
false ratios, one is close to 1.0;
the other one is only 0.3
cassandra bloom filters are computed for 1% false positive ratio.
is there any measure to increase the effectiveness of bloom fil
I noticed that 2 of my CFs are showing very different bloom filter
false ratios, one is close to 1.0;
the other one is only 0.3
they have roughly the same sizes in SStables and counts, the
difference is key construction,
the one with 0.3 false ratio has a shorter key.
assuming the key can not be
I have check both the output file and the system log, neither have errors in
them. I don't believe anything external is killing the process, I could be
wrong but this node's setup is the same as all my other nodes (including
hardware) so it doesn't make much sense.
jsvc.exec -user cassandra -home
You should be ok, depending on the partitioner strategy you use. The keys
end up created as a hash (which is why when you're setting up your nodes you
can give them a specific key. Then, whatever your key is will be used to
create an MD5 hash, that hash will then determine what node your data wil
Hi,
I am planing to make tests on Cassandra with a few nodes. I want to create a
column family where the key will be the date down to the second (like
2011/10/10-16:07:53). Doing so, my keys will be very similar from each others.
Is it ok to use such keys if I want my data to be evenly distribu
Hi there,
The dev's have been very busy and Cassandra 1.0 is just around the
corner and full of new features. To celebrate I'm trying to give the wiki some
loving to make things a little more welcoming for new users.
To keep things manageable I'd like to focus on completeness an
The Cassandra team is pleased to announce the release of Apache Cassandra
version 0.8.7.
Cassandra is a highly scalable second-generation distributed database,
bringing together Dynamo's fully distributed design and Bigtable's
ColumnFamily-based data model. You can read more here:
http://cassand
On Mon, Oct 10, 2011 at 10:08 AM, Günter Ladwig wrote:
> Hi,
>
> I couldn't find anything on this issue, but maybe my google-fu is weak.
>
> I'm running a Cassandra 1.0.0-rc2 cluster with compression enabled for all of
> the two CFs I have right now. The load on a single node is about 32GB (disk
Hi,
no errors in the server logs. The columns are unreadable on all nodes at
any consistency level (ONE, QUORUM, ALL). We started with 0.7.3 and
upgraded to 0.7.6-2 two months ago.
Best,
Thomas
On 10/10/2011 10:03 AM, aaron morton wrote:
> What error are you seeing in the server logs ? Are the
Hi,
I couldn't find anything on this issue, but maybe my google-fu is weak.
I'm running a Cassandra 1.0.0-rc2 cluster with compression enabled for all of
the two CFs I have right now. The load on a single node is about 32GB (disk is
80GB per node).
Whenever I try to run a compaction using nod
Agree, EBS systems are not so good for cassandra systems and during previous
conversations in this mail list, people tend to use ephemeral.
從我的 BlackBerry® 無線裝置
-Original Message-
From: Sasha Dolgy
Date: Mon, 10 Oct 2011 10:03:26
To:
Reply-To: user@cassandra.apache.org
Subject: Re: eb
yes, should have been
And an explanation of why we normally avoid *EBS*.
My bad.
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 10/10/2011, at 9:03 PM, Sasha Dolgy wrote:
> just catching the tail end of this discussion. aaron, in yo
just catching the tail end of this discussion. aaron, in your previous
email, you said "And an explanation of why we normally avoid ephemeral. "
shouldn't this be, avoiding EBS? EBS was a nightmare for us in terms
of performance.
On Mon, Oct 10, 2011 at 9:23 AM, aaron morton wrote:
> 6 nod
What error are you seeing in the server logs ? Are the columns unreadable at
all Consistency Levels ? i.e. are the columns unreadable on all nodes.
What is the upgrade history of the cluster ? What version did it start at ?
Cheers
-
Aaron Morton
Freelance Cassandra Developer
It's not a problem by it's self, compaction will do it's thing. It you are also
seeing read latency increase it may be something you want to look it.
What version are you using ? The tuning is different (i.e. it gets easier)
between versions 0.7, 0.8 and 1.0.
It's probably just the case that
Have you checked /var/log/cassandra/output.txt (the packaged install pipes std
out/err to there) or the system logs ? If there are no errors in the logs it
may well be something external killing it.
With regard to memory usage, it's hard for people to help unless you provide
some numbers. Wha
6 nodes and RF3 will mean you can handle between 1 and 2 failed nodes.
see http://thelastpickle.com/2011/06/13/Down-For-Me/
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 7/10/2011, at 9:37 PM, Madalina Matei wrote:
> Hi Aaron,
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