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 ?
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
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 t
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 a
SSTables are immutable. Those won't changed once written to disk.
From iPhone
On 2011/05/19, at 9:37, Sameer Farooqui 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, Jonathan Ellis said
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:
http://mail-archives.apache.org/mod_mbox/cassandra-commits/201002.m
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:
http://www.thoughtcrime.org/s
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)
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 Cassand
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 h
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
> I guess you can use the same system, you need two CF for that and I think
> it's better to use 0.8 because it su
I guess you can use the same system, you need two CF for that and I think
it's better to use 0.8 because it supports counter :
One CF with UTF8Type called active-topics one CF with UUIDType called
topics-seen, then using the same principle :
for each timestampN you create :
For each visit to Top
Thanks victor!
Aren't there any good ways by using Cassandra alone ?
On Wed, May 18, 2011 at 11:41 PM, openvictor Open wrote:
> Have you thought about user another kind of Database, which supports
> volative content for example ?
>
> I am currently thinking about doing something similar. The bes
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 pro
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
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 hel
*
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.
Thi
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
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.
On Tue, 17 May 2011 15:52:22 -0700 Sameer Farooqui
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 authentication
interface.
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
drive
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 Abs
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
wrote:
> Hi all
>
> was wondering if there's anybody here planning to go to the Berlin
> Buzzwords and attend the cassandra hackathon.
>
> I'm stil
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 gen
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
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:
http://cassand
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 capa
> 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 in
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