I have 9 node cluster with RF-3 and using Cassandra0.70/Hector26. Recently
we are seeing lot of UnavailableException at the client side. Whenever
this happens, I found following pattern in Cassandra node's log file at that
given time,
UnavailableException is the expected error if an
As for static disk usage i would add this:
test: df -kh
description: run test after compaction (check GCGraceSeconds in
storage-conf.xml) as only then data is expunged permanently, run on data
disk, assuming here commitlog disk is separated from data dir.
green gauge: used_space 30% of disk
The Cassandra team is pleased to announce the release of Apache Cassandra
version 0.7.6.
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:
Hi all
was wondering if there's anybody here planning to go to the Berlin Buzzwords
and attend the cassandra hackathon.
I'm still indecisive but it might be good to have the chance to talk about
experiences in more detail.
Cheers,
Daniel
Hi Sylvain,
I did the upgrade from 0.7.4 to 0.7.5 and the exception does not occur anymore
(on Windows ...). Thanks for pointing me to the bug fix.
From the 0.7.5 version I upgraded to the 0.7.6 version, and this is also OK,
without any code changes and by still keeping the same data files
Oh damn, I would love to go, but I'll just be at Berlin Buzzwords for the
6th and 7th.
Next time :)
On Wed, May 18, 2011 at 2:31 PM, Daniel Doubleday
daniel.double...@gmx.netwrote:
Hi all
was wondering if there's anybody here planning to go to the Berlin
Buzzwords and attend the cassandra
The compose() and decompose() methods of AbstractType are used only by
the PIG driver (in 0.7 at least, in 0.8 I think
CQL uses them too). If you're not using PIG, you safe with making
those function simple pass-through, i.e, to have
something along the line of:
class CustomComparator extends
Great! I'm not using PIG.
Thanks.
-Original Message-
From: Sylvain Lebresne [mailto:sylv...@datastax.com]
Sent: Wednesday, May 18, 2011 3:07 PM
To: user@cassandra.apache.org
Subject: Re: AssertionError
The compose() and decompose() methods of AbstractType are used only by the PIG
On Tue, 17 May 2011 15:52:22 -0700 Sameer Farooqui cassandral...@gmail.com
wrote:
SF Would still be nice though to use the bcrypt hash over MD5 for stronger
SF security.
I used MD5 when I proposed SimpleAuthenticator for two reasons:
1) SimpleAuthenticator is supposed to be a demo of the
On Wed, 2011-05-18 at 14:31 +0200, Daniel Doubleday wrote:
was wondering if there's anybody here planning to go to the Berlin
Buzzwords and attend the cassandra hackathon.
I'll be there.
I'm still indecisive but it might be good to have the chance to talk
about experiences in more detail.
I'll CC Nirmal Ranganathan who implemented the internode encryption who might
be able to give you some advice on this.
On May 17, 2011, at 7:47 PM, Sameer Farooqui wrote:
Thanks for the link, Jeremy.
I generated the keystore and truststore for inter-node communication using
the link in
*
For a discussions forum, I need to show a page of most viewed discussions.
For implementing this, I maintain a count of views of a discussion when
this views count of a discussion passes a certain threshold limit, the
discussion Id is added to a row of most viewed discussions.
I would arrange for memtable flush period in such a manner that the time
period for which these most viewed discussions are generated equals the
memtable flush timeperiod, so that the entire row of most viewed discussion
on a topic is in one or maximum two memtables/ SST tables.
This would also
Hello all,
I know organization is a broad topic and everybody may have an idea on how
to do it, but I really want to have some advices and opinions and I think it
could be interesting to discuss this matter.
Here is my problem: I am designing a messaging system internal to a website.
There are 3
Have you thought about user another kind of Database, which supports
volative content for example ?
I am currently thinking about doing something similar. The best and simplest
option at the moment that I can think of is Redis. In redis you have the
option of querying keys with wildcards. Your
Thanks victor!
Aren't there any good ways by using Cassandra alone ?
On Wed, May 18, 2011 at 11:41 PM, openvictor Open openvic...@gmail.comwrote:
Have you thought about user another kind of Database, which supports
volative content for example ?
I am currently thinking about doing something
Sorry I made a mistake in topics-seen !
When you insert it should be :
topics-seen[topic:TopicX:timestampN]={TimeUUID3:whatever}
Sorry about that,
Victor
2011/5/18 openvictor Open openvic...@gmail.com
I guess you can use the same system, you need two CF for that and I think
it's better to
A small error in the debian setup script made it's way into the debian
package of 0.7.6
(more details here: https://issues.apache.org/jira/browse/CASSANDRA-2641).
We are working on fixing the problem but we must follow the apache
process and as
a result this may take a little longer than we would
Also if you were wearing an aluminium foil hat you may also be concerned about
how the password is sent to the server.
Again though, see previous I am not a security guy comment and helpful link
from Jonathan confirming that statement :)
Cheers
-
Aaron Morton
Freelance
One last word on the effect of memory mapped IO on the VIRT, RES and
SHR columns in the output of the top utility.
With mmap enabled, VIRT can be big, as much as the sum of the size of
all index and data files and the sizes of shared libraries. RES is the
sum of the sizes of
1) the Java heap,
2)
I am wearing said hat and am freaking out right now :-)
Just kidding and good point. I guess it would be nice if clients like Hector
had an option to use TLS/SSL to encapsulate the application protocol.
But even SSL/TLS is subject to attacks from tools like SSLSNIFF:
As of 0.8.0, is it possible to take a Cassandra snapshot to a different
volume (like a EBS volume dedicated for backups)?
About a year ago, Jonathan Ellis said that this won't be implemented b/c
snapshots are basically hard links:
SSTables are immutable. Those won't changed once written to disk.
From iPhone
On 2011/05/19, at 9:37, Sameer Farooqui cassandral...@gmail.com wrote:
As of 0.8.0, is it possible to take a Cassandra snapshot to a different
volume (like a EBS volume dedicated for backups)?
About a year ago,
Ahh.. yeah. And during a compaction a new SSTable is created with the merged
data.
So, if I take a snapshot before compaction, the old SSTables won't be
deleted (b/c the snapshot hard links still have a reference to the files).
But if I hadn't taken a snapshot before compaction, does compaction
Please note that all files on unix file system are basically hard links
referring specific inode. If you make a hard link to a file, it means the inode
has two referring names.
When the SSTable is compacted and GCed, Cassandra delete the old SSTable but
keep snapshot. Now the reference count to
Has anybody heard of or used Toad to access Cassandra?
http://www.quest.com/toad-for-cloud-databases/
They claim to: Toad® for Cloud Databases provides a SQL-based interface
that makes it simple for you to generate queries, migrate, browse, and edit
data, as well as create reports and tables in
I am using Hector for a project wanted to try out using counters with
latest 0.8 v Cassandra.
How do we work with counters in 0.8 version ? Any web-links to such examples
are appreciated.
Has Hector started to provide API for that ?
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