i have question for HOM FAQ:
http://rantav.github.com/hector/build/html/content/HOM/hector-object-mapper.html#hom-faq
please write short example how to persist objects in batch.
Dne 16.9.2011 8:20, Yang napsal(a):
I looked at the JMX attributes
CFS.BloomFilterFalseRatio, it's 1.0 , BloomFilterFalsePositives, it's
2810,
its possible to query this bloom filter false ratio from command line?
Thanks, will be handy for new peeps.
A
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 7/10/2011, at 12:00 PM, Patricio Echagüe wrote:
Hi, I wanted to let you all know that Hector client has a website.
http://hector-client.org
Of the top of my head I it's not exposed via nodetool.
You can get it via HTTP if you install mx4j or if you could try
http://wiki.cyclopsgroup.org/jmxterm
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 7/10/2011, at 8:09 PM,
Hi,
I'm looking to deploy a 5 nodes cluster in EC2 with RF3 and QUORUM CL.
Could you please advice me on EBS vs ephemeral storage ?
Cheers,
Madalina
Obviously ephemeral. It has higher IO availability, will not affect your
Ethernet IO performance, and it is free (included in instance price)
and the redundancy is provided by cassandra itself.
從我的 BlackBerry® 無線裝置
-Original Message-
From: Madalina Matei madalinaima...@gmail.com
Date:
Data Stax have pre build AMI's here
http://www.datastax.com/dev/blog/setting-up-a-cassandra-cluster-with-the-datastax-ami
And an explanation of why we normally avoid ephemeral.
Also, I would go with 6 nodes. You will then be able to handle up to 2 failed
nodes.
Hope that helps.
Hi Aaron,
For a 6 nodes cluster, what RF can we use in order to support 2 failed
nodes?
From the article that you sent i understood avoid EMS and use ephemeral.
am i missing anything?
Thank you so much for your help,
Madaina
On Fri, Oct 7, 2011 at 9:15 AM, aaron morton
Dne 7.10.2011 10:04, aaron morton napsal(a):
Of the top of my head I it's not exposed via nodetool.
You can get it via HTTP if you install mx4j or if you could try
http://wiki.cyclopsgroup.org/jmxterm
i have MX4J/Http but cant find that info in listing.
i suspect that bloom filter
Is it actually filling up enough to trigger an old-gen CMS gc?
Yes, it fills up to the 16G and then it starts doing the CMS gc's which
dramatically decreases the performance.
I'm still not sure why it does this, as a nodetool info states the load
as less than 4G.
Any ideas?
On 10/06/2011
Look at the OOM section in
http://www.datastax.com/docs/0.6/troubleshooting/index
On Fri, Oct 7, 2011 at 3:47 AM, Stefan Reek ste...@unitedgames.com wrote:
Is it actually filling up enough to trigger an old-gen CMS gc?
Yes, it fills up to the 16G and then it starts doing the CMS gc's which
We have a Column Family that is immutable (no updates after the first write).
Suppose we use RF=2 and W=1. Do we still need R=2, so that R+WRF? Or is it
sufficient to have R=1? My guess is yes, R=1 is sufficient since if it reads a
row, the row has to be correct: it can't get stale data.
The last sentence should have been In other words, does R apply also to
(possibly failed) read attempts or only to successful reads?
Anthony
From: peacepatr...@hotmail.com
To: user@cassandra.apache.org
Subject: Immutable CFs and read consistency
Date: Fri, 7 Oct 2011 06:21:04 -0700
We
If I trigger hint delivery using JMX, it works. I see in the log:
2011-10-07 15:17:51,216 INFO 15:17:51,216 Started hinted handoff for endpoint
/172.16.108.19
However, it does not work automatically (i.e. after node 3 is up again).
I tested it with Cassandra 0.8.6 and there it works as
The R+W RF requirement for strong consistency applies regardless of
whether your data is 'immutable' or is being updated. A W=1, R=1 approach
will not guarantee consistency between reads and writes.
R=1 might cassandra look on one of the two nodes, find no data there, and
prematurely give
Check your disk utilization using iostat. Also, check if compactions
are causing reads to be slow. Check GC too.
You can look at cfhistograms output or post it here.
On Fri, Oct 7, 2011 at 1:44 AM, Radim Kolar h...@sendmail.cz wrote:
Dne 7.10.2011 10:04, aaron morton napsal(a):
Of the top of
Reviving this thread...
Say you want to enable potentially thousands of tenants with their own sets
of column families? In this situation a keyspace for each tenant wouldn't
work it would seem...what issues would we likely see if we were to build out
thousands of column families (where a column
This was fixed in 0.7.8 by CASSANDRA-2928
In general it's a good idea to upgrade to the latest stable release
before spending a lot of time debugging :)
On Fri, Oct 7, 2011 at 8:33 AM, Rene Kochen
rene.koc...@emea.schange.com wrote:
If I trigger hint delivery using JMX, it works. I see in the
On Fri, Oct 7, 2011 at 9:36 AM, David McNelis
dmcne...@agentisenergy.com wrote:
In some documentation I've read it says that
keyspace's take up the majority of the resources
This has never been the case.
in a couple of older
threads they talked about getting the number of column families
So at the end of the day its going to be limited by available memory then?
Going by this line:
Do note that a minimum of 1MB per memtable is used by the per-memtable arena
allocator https://issues.apache.org/jira/browse/CASSANDRA-2252 also
introduced in 1.0, which is worth keeping in mind if you
On Fri, Oct 7, 2011 at 10:47 AM, David McNelis
dmcne...@agentisenergy.comwrote:
So at the end of the day its going to be limited by available memory then?
Going by this line:
Do note that a minimum of 1MB per memtable is used by the per-memtable
arena allocator
I missed that one in the release notes. Thank you!
-Original Message-
From: Jonathan Ellis [mailto:jbel...@gmail.com]
Sent: vrijdag 7 oktober 2011 16:39
To: user@cassandra.apache.org
Subject: Re: Hinted handoff question
This was fixed in 0.7.8 by CASSANDRA-2928
In general it's a good
Hi Philippe,
On Thu, Sep 29, 2011 at 6:47 AM, Philippe watche...@gmail.com wrote:
No it was an upgrade from 0.8.4 or 0.8.5 depending on the nodes.
No cassandra-env files were changed during the update.
Any other ideas? The cluster has just been weird ever since running 0.8.6 :
has anyone
Okay, this is still a problem. This node keeps dieing at 1am every day, most
times without an error in the log. I'd appriciate any help in tracking down
why.
Additionally, I don't understand why 0.7.x using *way* more RAM than 0.6.x
and 0.8.x, from a top or ps perspective. I'm now watching the
Dne 7.10.2011 15:55, Mohit Anchlia napsal(a):
Check your disk utilization using iostat. Also, check if compactions
are causing reads to be slow. Check GC too.
You can look at cfhistograms output or post it here.
i dont know how to interpret cf historgrams. can you write it to wiki?
You'll see output like:
Offset SSTables
1 8021
2 783
Which means 783 read operations accessed 2 SSTables
On Fri, Oct 7, 2011 at 2:03 PM, Radim Kolar h...@sendmail.cz wrote:
Dne 7.10.2011 15:55, Mohit Anchlia napsal(a):
Check your disk utilization using
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