In a project I would like to store big objects in columns, serialized. For
example entire images (several Ko to several Mo), flash animations (several
Mo) etc...
Does someone use Cassandra with those relatively big columns and if yes does
it work well ? Is there any drawbacks using this
You're right when you say it's unlikely that 2 threads have the same
timestamp, but it can. So it could work for user creation, but maybe
not on a more write intensive problem.
Um, sorry I thought you re solving exact case of duplicate user creation. If
youre trying to solve the concurrent
Thanks very much
-Original Message-
From: sc...@scode.org [mailto:sc...@scode.org] On Behalf Of Peter Schuller
Sent: Friday, January 14, 2011 4:40 PM
To: user@cassandra.apache.org
Subject: Re: about the data directory
as a administrator, I want to know why I can read the data from any
It's possible that I am misunderstanding the question in some way.
The row keys can be Time UUIDs and with those row keys as column names, u
can use comparator TIMEUUIDTYPE to have them sorted by time automatically.
On Fri, Jan 14, 2011 at 9:18 AM, Aaron Morton aa...@thelastpickle.comwrote:
The cassandra logs strangely show no errors at the time of failure.
Changing the RPCTimeoutInMillis seemed to help. Though it slowed down the
job considerably, it seems to be finishing by changing the timeout value
to 1 min. Unfortunately, I cannot be sure if it will continue to work if
the data
Hello,
I'm new to cassandra. I'm using cassandra release 0.7.0 (local, single node). I
can't perform write operations in case the column and supercolumn families have
different comparator types. For example if I use the code given in Issue:
https://issues.apache.org/jira/browse/CASSANDRA-1712
@Roshan
Yes, I thought about that, but then I wouldn't be able to use the
Random Partitioner.
@Aaron
Do you mean like this: 'timeUUID+ row_key' as the supercolumn names?
then when retriving the row_key from this column name, will I be
required to parse the name ? How do I do that exactly ?
On Fri, Jan 14, 2011 at 7:15 PM, Aklin_81 asdk...@gmail.com wrote:
@Roshan
Yes, I thought about that, but then I wouldn't be able to use the
Random Partitioner.
Can you please expand a bit on this? What is this restriction? Can you point
me to some relevant documentation on this?
Thanks.
I am not sure but I guess because all the rows of certain time range will go
to just one node will not be evenly distributed because the timeUUID will
not be random but sequential according to time... I am not sure anyways...
On Fri, Jan 14, 2011 at 7:18 PM, Roshan Dawrani
I too believed so! but not totally sure.
On 1/14/11, Rajkumar Gupta rajkumar@gmail.com wrote:
I am not sure but I guess because all the rows of certain time range will go
to just one node will not be evenly distributed because the timeUUID will
not be random but sequential according to
I am not clear what you guys are trying to do and say :-)
So, let's take some specifics...
Say you want to create rows in some column family (say CF_A), and as you
create them, you want to store their row key in column names in some other
column family (say CF_B) - possibly for filtering keys
Hi,
just installed Cassandra on Ubuntu using package manager
but I can not start it
I get the following error in the logs:
INFO [main] 2011-01-14 15:37:49,758 AbstractCassandraDaemon.java (line 74)
Heap size: 1051525120/1051525120
WARN [main] 2011-01-14 15:37:49,826 CLibrary.java (line 73)
I just read that cassandra internally creates a md5 hash that is used
for distributing the load by sending it to a node reponsible for the
range within which that md5 hash falls, so even when we create
sequential keys, their MD5 hash is not the same hence they are not
sent to same node. This was
Hi,
does this seem like a generally useful feature?
I do think this could be a useful feature. If only because I don't think
there
is any satisfactory/efficient way to do this client side.
if so, would it be hard to implement (maybe it could be done at compaction
time like the TTL feature)?
Hello
Dear community please share your experience, home you make live(without
stop) migration from mysql or other RDBM to cassandra
No, you do not need to shut up, please! :)
you may be clearing up my further misconceptions on the topic!
Anyways, the link b/w 1st and 2nd para was that since the rows
distribution among nodes is not affected by key(as you rightly said)
but by md5 hash of the key thus I can use just any key
On Fri, Jan 14, 2011 at 10:40 AM, ruslan usifov ruslan.usi...@gmail.com wrote:
Hello
Dear community please share your experience, home you make live(without
stop) migration from mysql or other RDBM to cassandra
There is no built in way to do this. I remember hearing at hadoop
world this year
Hey,
If you have a site in production environment or considering so, what
is the client that you use to interact with Cassandra. I know that
there are several clients available out there according to the
language you use but I would love to know what clients are being used
widely in production
Digest reads could be being dropped..?
On Thu, Jan 13, 2011 at 4:11 PM, Jonathan Ellis jbel...@gmail.com wrote:
On Thu, Jan 13, 2011 at 2:00 PM, Edward Capriolo edlinuxg...@gmail.com
wrote:
Is it possible that your are reading at READ.ONE and that READ.ONE
only warms cache on 1 of your
That's possible, yes. He'd want to make sure there aren't any of
those WARN messages in the logs.
On Fri, Jan 14, 2011 at 11:46 AM, Mike Malone m...@simplegeo.com wrote:
Digest reads could be being dropped..?
On Thu, Jan 13, 2011 at 4:11 PM, Jonathan Ellis jbel...@gmail.com wrote:
On Thu,
I use Hector, if that counts. ..
On Jan 14, 2011 7:25 PM, Ertio Lew ertio...@gmail.com wrote:
Hey,
If you have a site in production environment or considering so, what
is the client that you use to interact with Cassandra. I know that
there are several clients available out there according
what is the technology stack do you use?
On 1/14/11, Ran Tavory ran...@gmail.com wrote:
I use Hector, if that counts. ..
On Jan 14, 2011 7:25 PM, Ertio Lew ertio...@gmail.com wrote:
Hey,
If you have a site in production environment or considering so, what
is the client that you use to
Java
On Jan 14, 2011 8:25 PM, Ertio Lew ertio...@gmail.com wrote:
what is the technology stack do you use?
On 1/14/11, Ran Tavory ran...@gmail.com wrote:
I use Hector, if that counts. ..
On Jan 14, 2011 7:25 PM, Ertio Lew ertio...@gmail.com wrote:
Hey,
If you have a site in production
I am trying to use phpcasse
I use the following example
CassandraConn::add_node('localhost', 9160);
$users = new CassandraCF('rhg', 'Users'); // ColumnFamily
$users-insert('1', array('email' = 't...@example.com', 'password' =
'test'));
when I run it, it never returns,,, and apache
Hello.
According to JVM heap size topic at
http://wiki.apache.org/cassandra/MemtableThresholds , Cassandra would need
atleast 1G of memory to run. Is it possible to have a running Cassandra cluster
with machines that have less than that memory... say 512M?
I can live with slow transactions,
On Thu, Jan 13, 2011 at 2:32 PM, Mark Moseley moseleym...@gmail.com wrote:
On Thu, Jan 13, 2011 at 1:08 PM, Gary Dusbabek gdusba...@gmail.com wrote:
It is impossible to properly bootstrap a new node into a system where
there are not enough nodes to satisfy the replication factor. The
cluster
We've done hundreds of gigs in and out of cassandra 0.6.8 with pycassa 0.3.
Working on upgrading to 0.7 and pycassa 1.03.
I don't know if we're using it wrong, but the connection object is tied to
a particular keyspace constraint isn't that awesome--we have a number of
keyspaces used
Dear rajat,
Yes it is possible, I have the same constraints. However I must warn you,
from what I see Cassandra memory consumption is not bounded in 0.6.X on
debian 64 Bit
Here is an example of an instance launch in a node :
root 19093 0.1 28.3 1210696 *570052* ? Sl Jan11 9:08
Perhaps the better question would be, if I have a two node cluster and
I want to be able to lose one box completely and replace it (without
losing the cluster), what settings would I need? Or is that an
impossible scenario? In production, I'd imagine a 3 node cluster being
the minimum but
OK,
I nearly have the Cassandra-Maven-Plugin ready.
It has the following goals:
run: launches Cassandra in the foreground and blocks until you press
^C at which point Maven terminates. Use-case: Running integration
tests from your IDE. Live development from your IDE.
start: launches
On Fri, Jan 14, 2011 at 4:29 PM, Aaron Morton aa...@thelastpickle.com wrote:
Here's some slides I did last year that have a simple explanation of RF
http://www.slideshare.net/mobile/aaronmorton/well-railedcassandra24112010-5901169
Short version is, generally no single node contains all the
On Fri, Jan 14, 2011 at 2:13 PM, Victor Kabdebon
victor.kabde...@gmail.com wrote:
Dear rajat,
Yes it is possible, I have the same constraints. However I must warn you,
from what I see Cassandra memory consumption is not bounded in 0.6.X on
debian 64 Bit
Here is an example of an instance
hi,
cassandra supports hadoop to map reduce from cassandra.
now I am digging to find out a way to map from a file and cassandra together.
I mean if both of them are files in my disk, it is possible by using splits.
but, in this kind of a situtation, which way is posssible?
for example.
in
mmapping only consumes memory that the OS can afford to feed it.
On Fri, Jan 14, 2011 at 7:29 PM, Edward Capriolo edlinuxg...@gmail.com wrote:
On Fri, Jan 14, 2011 at 2:13 PM, Victor Kabdebon
victor.kabde...@gmail.com wrote:
Dear rajat,
Yes it is possible, I have the same constraints.
Hi Jonathan, hi Edward,
Jonathan : but it looks like mmaping wants to consume the entire memory of
my server. It goes up to 1.7 Gb for a ridiculously small amount of data.
Am I doing something wrong or is there something I should change to prevent
this never ending increase of memory consumption
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