What sort of compression (if any) is performed by cassandra?
Does the thrift client compress anything before sending to the server to
preserve bandwidth?
Does the server compress the values in the columns to preserve disk or
memory?
... I assume compaction, performed on the server side, is differe
808 depends on 674, which has not been fixed, so no, there is no code for 808.
-Original Message-
From: "JKnight JKnight"
Sent: Wednesday, March 31, 2010 10:22pm
To: user@cassandra.apache.org
Subject: Re: Cassandra data file corrupt
Dear Jeremy Dunck,
I tried to compact, and get and err
Sounds like the bat file is building the classpath incorrectly?
You could try echo-ing it before invoking java.
On Wed, Mar 31, 2010 at 11:16 PM, Rao Venugopal wrote:
> All
> I am trying to get this to work on windows. While I had no problems on my
> x86 laptop (running XP), I am experiencing i
All
I am trying to get this to work on windows. While I had no problems on my
x86 laptop (running XP), I am experiencing issues getting it to work on my
x64 desktop (running Vista).
Anyone else got it to work on x64 running Vista?
This is the error I see when I run cassandra.bat
Dear Jeremy Dunck,
I tried to compact, and get and error:
Caused by: java.io.UTFDataFormatException: malformed input around byte 13
at java.io.DataInputStream.readUTF(DataInputStream.java:617)
at java.io.RandomAccessFile.readUTF(RandomAccessFile.java:887)
at org.apache.cassandra.io.It
On Wed, Mar 31, 2010 at 6:21 PM, James Golick wrote:
> Keyspace: ActivityFeed
> Read Count: 699443
> Read Latency: 16.11017477192566 ms.
> Column Family: Events
> Read Count: 232378
> Read Latency: 0.396 ms.
> Row cac
Writing a Factor generator for Thrift is probably your best bet. It
should be pretty doable; the C# backend for instance is ~1700 loc.
-Jonathan
On Wed, Mar 31, 2010 at 3:40 PM, Vladimir Lushnikov
wrote:
> Hi all,
>
> Does anyone have any experience using Cassandra as a data store in Factor
>
Keyspace: ActivityFeed
Read Count: 699443
Read Latency: 16.11017477192566 ms.
Write Count: 69264920
Write Latency: 0.020393242755495856 ms.
Pending Tasks: 0
...snip
Column Family: Events
SSTable count: 5
Sp
What does the CFS mbean think read latencies are? Possibly something
else is introducing latency after the read.
On Wed, Mar 31, 2010 at 5:37 PM, James Golick wrote:
> Standard CF. 10 columns per row. Between about 800 bytes and 2k total per
> row.
> On Wed, Mar 31, 2010 at 3:06 PM, Chris Goffin
Standard CF. 10 columns per row. Between about 800 bytes and 2k total per
row.
On Wed, Mar 31, 2010 at 3:06 PM, Chris Goffinet wrote:
> How many columns in each row?
>
> -Chris
>
> On Mar 31, 2010, at 2:54 PM, James Golick wrote:
>
> I just tried running the same multi_get against cassandra 1000
How many columns in each row?
-Chris
On Mar 31, 2010, at 2:54 PM, James Golick wrote:
> I just tried running the same multi_get against cassandra 1000 times,
> assuming that that'd force it in to cache.
>
> I'm definitely seeing a 5-10ms improvement, but it's still looking like
> 20-30ms on a
Yes, I would. How many columns are you reading per row? How larger
are they? Are they supercolumns?
On Wed, Mar 31, 2010 at 4:54 PM, James Golick wrote:
> I just tried running the same multi_get against cassandra 1000 times,
> assuming that that'd force it in to cache.
> I'm definitely seeing
I just tried running the same multi_get against cassandra 1000 times,
assuming that that'd force it in to cache.
I'm definitely seeing a 5-10ms improvement, but it's still looking like
20-30ms on average. Would you expect it to be faster than that?
- James
On Wed, Mar 31, 2010 at 11:44 AM, Jonat
Hi all,
Does anyone have any experience using Cassandra as a data store in Factor
[http://factor-language.org](perhaps using something like thrift)?
Kind regards,
Vladimir Lushnikov
Sent using BlackBerry®
On that topic, what exactly is keeping this feature out of the official
releases?
On Wed, Mar 31, 2010 at 3:43 PM, Daniel Kluesing wrote:
> We also applied this patch to the 0.6 branch and have been running it for
> a bit over a week. Works well, would love to see it get into trunk/0.7
> proper
Hi all,
Does anyone have any experience using Cassandra as a data store in Factor
[http://factor-language.org](perhaps using something like thrift)?
Kind regards,
Vladimir Lushnikov
Sent using BlackBerry®
You can find version 0.08 of the Net::Cassandra::Easy Perl module at:
http://search.cpan.org/search?query=cassandra+easy&mode=all
This version comes with cassidy.pl, a command-line interface that
supports tab-completion. It's not finished (no docs yet, that's a TODO)
but in its current form it wi
Thanks a lot Jonathan and everyone else that replied to my thread. This
looks like it will do what I need. I have a colleague that is a Java
wizard and will probably have no problem putting this patch into place
for our production builds.
I'm a C/C++ programmer at heart so the code itself does
Cassandra 0.6.0-rc1 is available from the usual place[1]. Barring any
serious regressions, this will become the next stable release, so please
test and submit bug reports[2] if you spot problems.
[1]: http://cassandra.apache.org/download/
[2]: https://issues.apache.org/jira/browse/CASSANDRA
As a
We also applied this patch to the 0.6 branch and have been running it for a bit
over a week. Works well, would love to see it get into trunk/0.7 proper.
From: Ryan Daum [mailto:r...@thimbleware.com]
Sent: Wednesday, March 31, 2010 11:49 AM
To: user@cassandra.apache.org
Subject: Re: expiring data
But then you'd still be caching the same things memcached is, so
unless you have a lot more ram you'll presumably miss the same rows
too.
The only 2-layer approach that makes sense to me would be to have
cassandra keys cache at 100% behind memcached for the actual rows,
which will actually reduce
I was able to successfully merge this patch into the 0.6 branch a few weeks
ago by doing the following:
- Downloading the patch
- Checking out the trunk of Cassandra from github
- Rolling back (checking out) the git repo to the same date that the
patch was submitted to Jira
- Apply
Sounds like you want to follow
https://issues.apache.org/jira/browse/CASSANDRA-699. There is a patch
there but I wouldn't recommend merging it if Java scares you. :)
On Wed, Mar 31, 2010 at 1:39 PM, Mike Gallamore
wrote:
> Hello everyone,
>
> I saw a thread on the incubator user chat that starte
Hello everyone,
I saw a thread on the incubator user chat that started a few months ago:
http://www.mail-archive.com/cassandra-u...@incubator.apache.org/msg02047.html
. It looks like this is the new official user mailing list so I'll add
my thoughts/question here.
Is there any way to set a T
Or, if faking memcached misses is too high a price to pay, queue some
proportion of the reads to replay asynchronously against Cassandra.
On Wed, 2010-03-31 at 11:04 -0500, Jonathan Ellis wrote:
> Can you redirect some of the reads from memcache to cassandra? Sounds
> like the cache isn't getting
On Wed, Mar 31, 2010 at 9:04 AM, Jonathan Ellis wrote:
> Can you redirect some of the reads from memcache to cassandra? Sounds
> like the cache isn't getting warmed up.
Yeah, putting a cache in front of a cache can ruin the locality of the
second cache.
-ryan
Can you redirect some of the reads from memcache to cassandra? Sounds
like the cache isn't getting warmed up.
On Wed, Mar 31, 2010 at 11:01 AM, James Golick wrote:
> I'm testing on the live cluster, but most of the production reads are being
> served by the cache. It's definitely the right CF.
>
I'm testing on the live cluster, but most of the production reads are being
served by the cache. It's definitely the right CF.
On Wed, Mar 31, 2010 at 8:30 AM, Jonathan Ellis wrote:
> On Wed, Mar 31, 2010 at 12:01 AM, James Golick
> wrote:
> > Okay, so now my row cache hit rate jumps between 1.
On Wed, Mar 31, 2010 at 12:01 AM, James Golick wrote:
> Okay, so now my row cache hit rate jumps between 1.0, 99.5, 95.6, and NaN.
> Seems like that stat is a little broken.
Sounds like you aren't getting enough requests for the
getRecentHitRate to make sense. use getHits / getRequests.
But if
On Wed, Mar 31, 2010 at 7:55 AM, Stu Hood wrote:
> Eventually the new file format will make it in with #674, and we'll be able
> to implement an option to skip corrupted data:
>
> https://issues.apache.org/jira/browse/CASSANDRA-808
That ticket seems to indicate that compaction will remove the co
Eventually the new file format will make it in with #674, and we'll be able to
implement an option to skip corrupted data:
https://issues.apache.org/jira/browse/CASSANDRA-808
We're not ignoring this issue.
-Original Message-
From: "David Timothy Strauss"
Sent: Wednesday, March 31, 2010
--
Salutacions
Salvador Ausina
sausina_at_quadux_dot_net
quadux.net
Cassandra has always supported two great ways to prevent data loss:
* Replication
* Backups
I doubt Cassandra will ever focus extensively on single-node recovery when it's
so easy to wipe and rebuild any node from the cluster.
-Original Message-
From: JKnight JKnight
Date: Wed, 31 Mar
Dear all,
My Cassandra data file had problem and I can not get data from this file.
And all row after error row can not be accessed. So I lost a lot of data.
Will next version of Cassandra implement the way to prevent data lost. Maybe
we use the checkpoint. If data file corrupt, we will read from
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