So maybe it's weird to combine ORM and Cassandra, right? Is there
anything we can take from ORM?
Honestly I do not understand what is your question. It is clear that
you can not combine ORM such as Hibernate or iBATIS with Cassandra.
Cassandra it self is not a RDBMS, so you will not map the table
I understand the question more like : Is there already a lib which
help to get rid of writing hardcoded and hard to maintain lines like :
MyClass data;
String[] myFields = {name, label, ...}
ListColumn columns;
for (String field : myFields) {
if (field == name) {
columns.add(new
On Thu, Apr 22, 2010 at 8:24 PM, David Harrison
dave.l.harri...@gmail.com wrote:
Do those tombstone-d keys ever get purged completely ? I've tried
shortening the GCGraceSeconds right down but they still don't get
cleaned up.
The GCGraceSeconds will only apply when you compact data.
-ryan
On Fri, Apr 23, 2010 at 1:25 PM, Jeremy Dunck jdu...@gmail.com wrote:
See what you think of tragedy:
http://github.com/enki/tragedy
This one is feasible. I love the idea of 'Build your data model from
Model and Index'. Even better, I am INDEED working with python and
those indexes can be
So I'm guessing that means compaction doesn't include purging of
tombstone-d keys ? Is there any situation or maintenance process that
does ? (or are keys forever?)
On 23 April 2010 17:44, Ryan King r...@twitter.com wrote:
On Thu, Apr 22, 2010 at 8:24 PM, David Harrison
I have written some code to avoid thrift reconnection, it just keeps the
connection open between get_range_slices calls.
I can extract that and put it up but not until early next week.
/Johan
On 23 apr 2010, at 05.09, Jonathan Ellis wrote:
That would be an easy win, sure.
On Thu, Apr 22,
I got the same question, and after that cassandra cann't be started.
I want to know how to restart the cassandra after it crashed.
Thanks for any reply.
So basically the idea behind the batch processing is some performance gain via
network usage optimization? Thanks Jonathan!
El 22/04/2010, a las 21:32, Jonathan Ellis escribió:
nope, there is no guarantee of that. if the server fails
mid-operation you have to retry it.
On Thu, Apr 22,
How is this specified?
Is it a large hex #?
A string of bytes in hex?
http://wiki.apache.org/cassandra/StorageConfiguration doesn't say.
I would assume that you'd want to look for a C++ library that deals
with UUIDs. Cassandra or Thrift aren't in the business of doing that
conversion.
On Fri, Apr 23, 2010 at 4:59 AM, Olivier Rosello orose...@corp.free.fr wrote:
Here is my test code :
ColumnPath new_col;
new_col.__isset.column
Great! Created https://issues.apache.org/jira/browse/CASSANDRA-1017
to track this.
On Fri, Apr 23, 2010 at 4:12 AM, Johan Oskarsson jo...@oskarsson.nu wrote:
I have written some code to avoid thrift reconnection, it just keeps the
connection open between get_range_slices calls.
I can extract
Question:
It is possible to setup Cassandra such that 2 independent
Cassandra rings/clusters replicate to one another, ensuring that each
ring/cluster has at least 1 copy of all the data on each ring/cluster?
The setup is like this:
2 Data centers, one in Philadelphia and another
http://code.google.com/p/jassandra/source/browse/trunk/org.softao.jassandra/
src/org/softao/jassandra/thrift/ThriftColumnFamily.java
Insert and Delete method of this class are using batch_mutation.
Cheers.
Dop
From: Lubos Pusty [mailto:lubospu...@gmail.com]
Sent: Friday, April 23, 2010
Awesome. In the meantime, I hacked something similar myself. The
performance difference does not appear to be material. I think the real
killer is the get_range_slices call. Relative to that, the cost of getting
the connection appears to be more or less trivial. What can I do to
alleviate
You could look into it, but it's not going to be an easy backport
since SSTableReader and SSTableScanner got split into two classes in
trunk.
On Fri, Apr 23, 2010 at 9:39 AM, Joost Ouwerkerk jo...@openplaces.org wrote:
Awesome. In the meantime, I hacked something similar myself. The
On Wed, Apr 21, 2010 at 1:48 PM, Anthony Molinaro
antho...@alumni.caltech.edu wrote:
So why is Token - 1 better? Doesn't that result in more data movement
than PreviousTokenInRing + 1?
No, because a node is responsible for (previous token, own token]. So
if you introduce token T-1 before
Ran, Under very heavy load using more than 50 threads with 20k payload size, I
have seen Hector close connections then reopen so such that time_wait builds up
and can no longer connect.
-Original Message-
From: Ran Tavory [ran...@gmail.com]
Received: 4/22/10 1:29 AM
To:
Le vendredi 23 avril 2010 à 08:30 -0500, Jonathan Ellis a écrit :
want to look for a C++ library that deals
with UUIDs. Cassandra or Thrift aren't
Tank you for the response.
That's not the problem for me.
The problem is that new_col.column type is string.
uint8_t uuid[17];
On Thu, Apr 22, 2010 at 11:34 AM, tsuraan tsur...@gmail.com wrote:
Suppose I have a SuperColumn CF where one of the SuperColumns in each
row is being treated as a list (e.g. keys only, values are just
empty). In this list, values will only ever be added; deletion never
occurs. If I have two
a normal String from the same universe as your keys.
On Fri, Apr 23, 2010 at 7:23 AM, Mark Jones mjo...@imagehawk.com wrote:
How is this specified?
Is it a large hex #?
A string of bytes in hex?
http://wiki.apache.org/cassandra/StorageConfiguration doesn’t say.
In that case I should probably wait for 0.7. Is there any fundamental
performance difference in get_range_slices between Random and
Order-Preserving partitioners. If so, by what factor?
joost.
On Fri, Apr 23, 2010 at 10:47 AM, Jonathan Ellis jbel...@gmail.com wrote:
You could look into it,
So if my keys are binary, is there any way to escape the keysequence in?
I have 20 bytes (any value 0x0-0xff is possible) as the key.
Are they compared as an array of bytes? So that I can use truncation?
4 nodes, broken up by 0x00, 0x40, 0x80, 0xC0?
-Original Message-
From: Jonathan
Turns out assign can be called with the length as well
So mod your code to be
new_col.column.assign((char *)uuid, 16);
and you are fixed.
-Original Message-
From: Mark Jones [mailto:mjo...@imagehawk.com]
Sent: Friday, April 23, 2010 10:52 AM
To: user@cassandra.apache.org
Subject: RE:
On Thu, Apr 22, 2010 at 11:34 AM, tsuraan tsur...@gmail.com wrote:
Suppose I have a SuperColumn CF where one of the SuperColumns in each
row is being treated as a list (e.g. keys only, values are just
empty). In this list, values will only ever be added; deletion never
occurs. If I have two
On Fri, Apr 23, 2010 at 4:59 AM, richard yao richard.yao2...@gmail.comwrote:
I got the same question, and after that cassandra cann't be started.
I want to know how to restart the cassandra after it crashed.
Thanks for any reply.
Perhaps supply the error when you restart it?
-Brandon
So I've been trying to migrate off of old ec2 m1.large nodes onto xlarge
nodes so I can get enough breathing room to then do an upgrade to 0.6.x
(I can't keep the large nodes up long enough, so I spend all my time
restarting and trying to move data, so can get all the packages I would
need for
There is nothing wrong with what you are asking. Some work has been done to
get an ORM layer ontop of cassandra, for example, with a RubyOnRails
project. I'm trying to simplify cassandra integration with grails with the
plugin I'm writing.
The problem is ORM solutions to date are wrapping a
Any insights?
Much appreciated!
On Thu, Apr 22, 2010 at 11:13 PM, S Ahmed sahmed1...@gmail.com wrote:
I was just reading that thanks.
What does he mean when he says:
This appears to be related to data storage paths I set, because if I
switch the paths back to the default UNIX paths.
On Fri, Apr 23, 2010 at 12:41:17PM -0500, Jonathan Ellis wrote:
On Fri, Apr 23, 2010 at 12:30 PM, Anthony Molinaro
antho...@alumni.caltech.edu wrote:
Some nodes appear in the ring from some nodes, but not others. Right
now I have 14 nodes, 10 of those nodes have the same output of a
On Fri, Apr 23, 2010 at 1:12 PM, Anthony Molinaro
antho...@alumni.caltech.edu wrote:
I'm not sure how it would get this, maybe I need to restart my seed node?
It's worth a try. Sounds like you found an unusual bug in gossip.
When I run nodeprobe ring on the seed I don't see any of the hosts I
Try the
cassandra-with-fixes.bathttps://issues.apache.org/jira/secure/attachment/12442349/cassandra-with-fixes.bat
file
attached to the issue. I had the same issue an that bat file got cassandra
to start. It still throws another error complaining about the
log4j.properties.
On Fri, Apr 23, 2010
you could do it with standard techniques to run java apps as windows
services. i understand it's a bit painful.
On Fri, Apr 23, 2010 at 2:05 PM, S Ahmed sahmed1...@gmail.com wrote:
Is it possible to have Cassandra run in the background on a windows server?
i.e. as a service so if the server
https://issues.apache.org/jira/browse/CASSANDRA-292 points to
http://commons.apache.org/daemon/procrun.html which is used by other Apache
software to implement Windows services in Java. CassandraDaemon conforms to
the Commons Daemon spec.
On Fri, Apr 23, 2010 at 2:20 PM, Jonathan Ellis
Jonathan,
Have you thought of using Trove collections instead of regular java collections
(HashMap / HashSet) in Cassandra? Trove maps are faster and require less memory
Carlos
This email message and any attachments are for the sole use of the intended
recipients and may contain proprietary
From what I have seen Trove is only a win when you are doing Maps of
primitives, which is mostly not what we use in Cassandra. (The one
exception I can think of is a map of int - columnfamilies in
CommitLogHeader. You're welcome to experiment and see if using Trove
there or elsewhere makes a
I will try to modify the code... what I like about Trove is that even for
regular maps (non primitive) there are no Entry objects created so there are
much less references to be gced
On Apr 23, 2010, at 2:55 PM, Jonathan Ellis wrote:
From what I have seen Trove is only a win when you are
This used to be the case but was fixed couple of weeks ago. Which version
are you using?
On Apr 23, 2010 5:56 PM, Todd Burruss bburr...@real.com wrote:
Ran, Under very heavy load using more than 50 threads with 20k payload
size, I have seen Hector close connections then reopen so such that
I am starting out with Cassandra and I had a couple of questions, I read a
lot of the documentation including:
http://arin.me/blog/wtf-is-a-supercolumn-cassandra-data-model
First I wanted to make sure I understand this bug:
http://issues.apache.org/jira/browse/CASSANDRA-598
Borrowing from the
I trying to better understand how using the RandomPartitioner will affect my
ability to select ranges of keys. Consider my simple example where we have
many online games across different game genres (GameType). These games need
to store data for each one of their users. With that in mind consider
i see these exceptions on 4 out of the 7 nodes in my cluster. in
addition those same four nodes all show AE-SERVICE-STAGE with pending
work, and been showing this for several hours now. each node in the
cluster has less than 2gb, so it should be finished by now.
when i do nodetool streams
java.net.ConnectException: Connection timed out at
sun.nio.ch.Net.connect is an os-level connection problem.
On Fri, Apr 23, 2010 at 3:34 PM, B. Todd Burruss bburr...@real.com wrote:
i see these exceptions on 4 out of the 7 nodes in my cluster. in addition
those same four nodes all show
i agree, but it seems to have implications on the streaming service.
Jonathan Ellis wrote:
java.net.ConnectException: Connection timed out at
sun.nio.ch.Net.connect is an os-level connection problem.
On Fri, Apr 23, 2010 at 3:34 PM, B. Todd Burruss bburr...@real.com wrote:
i see these
Can you create a ticket?
On Fri, Apr 23, 2010 at 3:50 PM, B. Todd Burruss bburr...@real.com wrote:
i agree, but it seems to have implications on the streaming service.
Jonathan Ellis wrote:
java.net.ConnectException: Connection timed out at
sun.nio.ch.Net.connect is an os-level connection
Eliminating GC hell would probably do a lot to help Cassandra maintain speed vs
periods of superfast/superslow performance. I look forward to hearing how this
experiment goes.
From: Eric Hauser [mailto:ewhau...@gmail.com]
Sent: Friday, April 23, 2010 3:37 PM
To: user@cassandra.apache.org
Hell yeah!
--
Jeff
On Fri, Apr 23, 2010 at 10:59 AM, Brian Frank Cooper
coop...@yahoo-inc.com wrote:
Yahoo! Research is pleased to announce the release of the Yahoo! Cloud
Serving Benchmark, YCSB v. 0.1.0, as an open source package. YCSB is a
common benchmarking framework for cloud database,
https://issues.apache.org/jira/browse/CASSANDRA-1019
Jonathan Ellis wrote:
Can you create a ticket?
On Fri, Apr 23, 2010 at 3:50 PM, B. Todd Burruss bburr...@real.com wrote:
i agree, but it seems to have implications on the streaming service.
Jonathan Ellis wrote:
On Fri, Apr 23, 2010 at 01:17:21PM -0500, Jonathan Ellis wrote:
On Fri, Apr 23, 2010 at 1:12 PM, Anthony Molinaro
antho...@alumni.caltech.edu wrote:
I'm not sure how it would get this, maybe I need to restart my seed node?
It's worth a try. Sounds like you found an unusual bug in gossip.
Hi,
I 'm new to Cassandra, trying to set up a single node to play with. I
set one up in a VM (0.6.1 off the website) , running fedora 12. Things
seem peachy in that I can connect to it with a modified hector
ExampleClient, and insert data into it.
However, when I decided to view this
can you attach the full stacktrace?
On Fri, Apr 23, 2010 at 4:50 PM, Amol Deshpande
amol.deshpa...@gazillion.com wrote:
Hi,
I ‘m new to Cassandra, trying to set up a single node to play with. I set
one up in a VM (0.6.1 off the website) , running fedora 12. Things seem
peachy in that I
Sure,
INFO [COMPACTION-POOL:1] 2010-04-23 14:21:48,973 CompactionManager.java (line
326) Compacted to
/home/amol/apache-cassandra-0.6.1/var/lib/cassandra/data/system/LocationInfo-9-Data.db.
1776/495
bytes for 2 keys. Time: 970ms.
ERROR [pool-1-thread-6] 2010-04-23 14:28:46,917 Cassandra.java
Hello,
I'm using Cassandra 0.6.1 with ruby library
I want to log events on a CF like this:
Events = { // CF CompareWith: TimeUUIDType
SomeEventID : { // Row
uuid_from_unix_timestamp : event_data,
...
}
}
I receive event data with a UNIX timestamp (nr of seconds passed
try LexicalUUIDType, that will distinguish the secs correctly
imo based on the existing impl (last I checked at least) TimeUUIDType
was equivalent to LongType
cheers,
jesse
--
jesse mcconnell
jesse.mcconn...@gmail.com
On Fri, Apr 23, 2010 at 17:51, Lucas Di Pentima lu...@di-pentima.com.ar
http://wiki.apache.org/cassandra/Operations
===
A Cassandra cluster always divides up the key space into ranges
delimited by Tokens as described above, but additional replica
placement is customizable via !IReplicaPlacementStrategy in the
configuration file. The standard strategies are
Hello,
I am looking to store patient physiologic data in Cassandra - it's being
collected at rates of 1 to 125 Hz. I'm thinking of storing the timestamps as
the column names and the patient/parameter combo as the row key. For example,
Bob is in the ICU and is currently having his blood
of sampled time
series data is to bucket/shard rows (i.e. Bob-20100423-bloodpressure)
so that you put an upper bound on the row length.
On Apr 23, 2010, at 7:01 PM, Andrew Nguyen andrew-lists-cassan...@ucsfcti.org
wrote:
Hello,
I am looking to store patient physiologic data in Cassandra
is easily
captured by it.
One typical way of dealing with the data explosion of sampled time series
data is to bucket/shard rows (i.e. Bob-20100423-bloodpressure) so that you
put an upper bound on the row length.
On Apr 23, 2010, at 7:01 PM, Andrew Nguyen
andrew-lists-cassan...@ucsfcti.org wrote
Turns out I needed to shut everything down completely, then start it all up
a rolling restart was still resulting in some nodes being confused about
what ring they were in.
I think the moral of all this, is any changes to the seed node must result
in a full restart of your cluster. Also any use
On Sat, Apr 24, 2010 at 1:36 AM, Ned Wolpert ned.wolp...@imemories.com wrote:
There is nothing wrong with what you are asking. Some work has been done to
get an ORM layer ontop of cassandra, for example, with a RubyOnRails
project. I'm trying to simplify cassandra integration with grails with
On Fri, Apr 23, 2010 at 1:22 PM, Carlos Sanchez
carlos.sanc...@riskmetrics.com wrote:
I will try to modify the code... what I like about Trove is that even for
regular maps (non primitive) there are no Entry objects created so there are
much less references to be gced
This could help, but
Your keys cannot be an encoded as binary for OPP, since Cassandra will attempt
to decode them as UTF-8, meaning that they may not come back in the same format.
0.7 supports byte keys using the ByteOrderedPartitioner, and tokens are
specified using hex.
-Original Message-
From: Mark
60 matches
Mail list logo
