I have few more questions:
1. If we change the write/delete consistency level to ALL, do we
eliminate the data inconsistency among nodes (since the delete
operations will apply to ALL replicas)?
2. My understanding is that Read Repair doesn't handle tombstones.
How about Node Tool Repair
Hi all,
I am using 0.6.8 across 5 machines with ~30G of data on each machine.
I am trying to run a map-reduce query (Both with my own Java code and Pig) and
failing after about 30 minutes (see stack trace and details below).
I have followed this wiki
https://issues.apache.org/jira/browse/CASSANDRA-1417
http://www.riptano.com/blog/whats-new-cassandra-066
My naive reading of CASSANDRA-1417 was that it could be used to save the
row cache to disk. Empirically it appears to only save the row keys,
and then reads each row.
In my case I set the
On Tue, 2011-01-11 at 09:23 -0500, Michael Fortin wrote:
This my understanding of 0.* releases.
- They're not considered production ready by the maintainers
- They subject to changes that break backwards compatibility
- Generally poorly documented because the api is so volatile
- Previous
As some of you may already be aware, 0.7.0 has been officially released.
You are free to start your upgrades, though not all at once, you'll
spoil your supper!
I apologize to anyone that might have noticed artifacts published as
early as Sunday and were confused by the lack of announcement, I
https://issues.apache.org/jira/browse/CASSANDRA-1417
[snip, row cache saving only keys]
Is this the intentional implementation? Are there any reason not to
just the entire row to disk to allow for faster startup?
Intentional (in the sense of not a mistake), but see:
Many thanks to those that put in all the hard work, time, dedication, etc
for another awesome release !!!
/*
Joe Stein
http://www.linkedin.com/in/charmalloc
Twitter: @allthingshadoop
*/
On Tue, Jan 11, 2011 at 12:23 PM, Eric Evans eev...@rackspace.com wrote:
As some of you may already be
The process to upgrade is:
1) run nodetool drain on _each_ 0.6 node. When drain finishes (log
message Node is drained appears), stop the process.
2) Convert your storage-conf.xml to the new cassandra.yaml using
bin/config-converter.
3) Rename any of your keyspace
Hi,
I've been experimenting quite a bit with Cassandra and think I'm getting to
understand it, but I would like some advice on modeling my data in Cassandra
for an application I'm developing.
The application will have a large number of records, with the records
consisting of a fixed part and
Happy new year all-
I just wanted to mention that I have released a new Cassandra data
management gem called ActiveColumn. The first major feature is
ActiveRecord-like database migrations. The gem is young but it works and is
well documented, and I'm very interested in feedback.
Blog post:
Nice work, Mike! I tweeted your project a few days ago. :)
On Tue, Jan 11, 2011 at 12:18 PM, Mike Wynholds m...@carbonfive.com wrote:
Happy new year all-
I just wanted to mention that I have released a new Cassandra data
management gem called ActiveColumn. The first major feature is
Awesome and great to see you're using our fauna cassandra gem. :)
-ryan
On Tue, Jan 11, 2011 at 10:18 AM, Mike Wynholds m...@carbonfive.com wrote:
Happy new year all-
I just wanted to mention that I have released a new Cassandra data
management gem called ActiveColumn. The first major
Thanks for your thoughtful and detailed replies Eric, it's much appreciated.
Mike
On Jan 11, 2011, at 11:23 AM, Eric Evans wrote:
On Tue, 2011-01-11 at 09:23 -0500, Michael Fortin wrote:
This my understanding of 0.* releases.
- They're not considered production ready by the maintainers
-
On 01/11/2011 12:23 PM, Peter Schuller wrote:
Is this the intentional implementation? Are there any reason not to
just the entire row to disk to allow for faster startup?
Intentional (in the sense of not a mistake), but see:
https://issues.apache.org/jira/browse/CASSANDRA-1625
The
What about this logger error? I'm getting it too, and I am also running simple
code with Hector and Eclipse:
log4j:WARN No appenders could be found for logger
(me.prettyprint.cassandra.connection.CassandraHostRetryService).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See
Add -verbose to the command-line options for the launch
configuration so you can see the classpath. It sounds like
log4j.properties is not being found. (Depending on your project setup,
you may need to add this file to the classpath explicitly).
On Tue, Jan 11, 2011 at 1:36 PM,
But now I need two knobs: Max size of row cache (best optimal steady
state hit rate) and number of row cache items to read in on startup
(so that the ROW-READ-STAGE does not need to drop packets and node can
be restarted in a reasonable amount of time).
Good idea IMO. File a jira ticket?
--
This makes total sense and is obvious in hindsight. But wouldn't such a
hypothetical stale row cache on be corrected by read repair (in other
words useless for write heavy workloads, not a problem for read heavy)?
It's not quite that simple. For example, suppose you write to the
cluster at
On 01/11/2011 02:56 PM, Peter Schuller wrote:
But now I need two knobs: Max size of row cache (best optimal steady
state hit rate) and number of row cache items to read in on startup
(so that the ROW-READ-STAGE does not need to drop packets and node can
be restarted in a reasonable amount of
Whatever I do, it happens :(
Thanks Peter for the reply. We are currently fixing our inconsistent
data (since we have master data saved) .
We will follow your suggestion and we will run Node Repair tool more
often in the future. However, what happens to data inserted/deleted
after Node Repair tool runs (i.e., between Node
That type of operation only works (directly) when using an
OrderPreservingPartitioner. There are a lot of downsides to OPP:
http://ria101.wordpress.com/2010/02/22/cassandra-randompartitioner-vs-orderpreservingpartitioner/
You can instead order your keys alphabetically as column names in a row
Thanks tyler
So the node I connect to Is the coordinate node. right?
But what’s the process about the replica?
Firstly, the data will be inserted by the coordinate node.
Secondly, it will find the first replica node based by the partitioner ,such
randompartitioner,
Thirdly, it will replicate
http://wiki.apache.org/cassandra/FAQ#range_rp
also, start==end==x means give me back exactly row x, if it exists.
IF you were using OPP you'd need end=y.
On Tue, Jan 11, 2011 at 7:45 PM, Koert Kuipers
koert.kuip...@diamondnotch.com wrote:
I would like to do a get_range_slices for all keys
Ok I see get_range_slice is really only useful for paging with RP...
So if I were using OPP (which I am not) and I wanted all keys starting with
com.google, what should my start_key and end_key be?
-Original Message-
From: Jonathan Ellis [mailto:jbel...@gmail.com]
Sent: Tuesday,
On Wed, Jan 12, 2011 at 7:41 AM, Koert Kuipers
koert.kuip...@diamondnotch.com wrote:
Ok I see get_range_slice is really only useful for paging with RP...
So if I were using OPP (which I am not) and I wanted all keys starting with
com.google, what should my start_key and end_key be?
I think
On 2011-01-11 15:41, Chris Burroughs wrote:
On 01/11/2011 02:56 PM, Peter Schuller wrote:
But now I need two knobs: Max size of row cache (best optimal steady
state hit rate) and number of row cache items to read in on startup
(so that the ROW-READ-STAGE does not need to drop packets and node
If you were using OPP and get_range_slices then set the start_key to be "com.google" and the end_key to be "". Get is slices of say 1,000 (use the last key read as the next start_ket) and when you see the first key that does not start with com.google top making calls.If you move the data from rows
Congratulations!!!
Best regards/ Pagarbiai
Viktor Jevdokimov
Senior Developer
Email: viktor.jevdoki...@adform.com
Phone: +370 5 212 3063
Fax: +370 5 261 0453
Konstitucijos pr. 23,
LT-08105 Vilnius,
Lithuania
Disclaimer: The information contained in this message and attachments is
intended
I think this happens for RTF. Some of the mails in the post are RTF,
and the reply button creates an RTF reply - that's when it happens.
Wonder how the mail to which I replied was in RTF...
Arijit
On 12 January 2011 05:28, Oleg Tsvinev oleg.tsvi...@gmail.com wrote:
Whatever I do, it happens :(
Congratulations for 0.7 and also 0.6.9!!!
On Wed, Jan 12, 2011 at 3:29 PM, Viktor Jevdokimov
viktor.jevdoki...@adform.com wrote:
Congratulations!!!
Best regards/ Pagarbiai
Viktor Jevdokimov
Senior Developer
Email: viktor.jevdoki...@adform.com
Phone: +370 5 212 3063
Fax: +370 5 261 0453
I have a follow on question on this.
I have a super column family like this:
ColumnFamily Name=EventSpace CompareWith=TimeUUIDType
CompareSubcolumnsWith=BytesType ColumnType=Super/
I store some events keyed by a subscriber id, and for each such row,
I have a number of super columns which are
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