lazyboy had a thread-based connection pool last time I checked, so he
should just have to thread his test loop for it to use multiple
connections. MySQL should suffer the same general problem though,
although I don't know the specifics of the MySQLdb module. Based on
his test, it's accurate to sa
This is a know issue and is out of Cassandra's specific hands. The
Thrift issue is: http://issues.apache.org/jira/browse/THRIFT-601
The temporary workaround is "don't send random data to your Cassandra instance."
Michael
2009/11/13 Ted Zlatanov :
> The sequence to trigger the bug:
>
> 1) telnet
It would be helpful to know the specific errors you're experiencing.
Michael
On Fri, Nov 13, 2009 at 10:51 AM, Mark Vigeant
wrote:
> I’m completely new to Cassandra and I think the wiki and documentation are
> really well done. Now I’m trying to construct an application to upload data
> to uploa
+1
On Wed, Nov 11, 2009 at 4:12 PM, Brandon Williams wrote:
> On Wed, Nov 11, 2009 at 4:10 PM, Eric Evans wrote:
>>
>> The current website is quite ugly, and I don't know about you, but I'm
>> itching to put the new project logo to use, so I'd like to propose
>> publishing http://cassandra.deadc
The remove call does not need the timestamp of what you inserted, it
just needs a timestamp *at least* that large. The current time will
work. Cassandra needs this to ensure that you are not removing
later-added data.
e.g.
Client 1 sends node X: Add 'a' at 11:00:00
Client 2 sends node Y: Remove
This has come up before at http://markmail.org/thread/w3mrh4h64xpf3vuj
and http://markmail.org/message/vnmsuddlrhaziq7g
I am in favor of adding eventually-consistent atomic operations such
as this, but I'm not sure how one would implement it. Some sort of
UUID + bloomfilter for the individual atom
Forwarding this along:
-- Forwarded message --
From: Bradford Stephens
Date: Thu, Oct 29, 2009 at 3:48 PM
Subject: HBase vs. Cassandra: new article!
To: hbase-u...@hadoop.apache.org, core-u...@hadoop.apache.org
Hey there,
Thought you guys would be interested in a new blog arti
"reversed" is a boolean option on the SliceRange that you pass in the
get_slice method via its predicate parameter.
Michael
On Sun, Oct 25, 2009 at 8:26 PM, kevin wrote:
> hi jonathan
> thanks for the clarification.
>
subcolumns is what you want (with the reverse option to slice, to get
This is passed in on the command line, and can be found in bin/
cassandra.in.sh if using the default scripts.
Michael
On Oct 22, 2009, at 5:08 AM, Johannes Schaback > wrote:
Hi,
I am not sure how far this is actually a RMI thing than concerns
Cassandra, but Cassandra appears to start RMI on
No, that's "trunk" or what will become 0.5
The 0.4 branch can be found here:
http://svn.apache.org/repos/asf/incubator/cassandra/branches/cassandra-0.4/
A 0.4.1 release will be made off of that branch eventually.
The 0.4.0 final release in SVN can be found here:
http://svn.apache.org/repos/asf/i
I recognize my esteemed colleague in the Chicago delegation and echo
his truths before putting forth my own ballot:
~~{ Ballot }~~
[ 10 ] 2 http://99designs.com/contests/28940/entries/002
[ 9 ] 30 http://99designs.com/contests/28940/en
Briefly
* Coherence is in-memory, Cassandra is persisted
* Coherence has a transactional model, Cassandra is eventually consistent
* Coherence has specially written adapters for different
environments/languages, Cassandra supports most languages through
Thrift
* They both are distributed repositori
On Tue, Sep 29, 2009 at 2:46 PM, Jonathan Ellis wrote:
> On Tue, Sep 29, 2009 at 2:22 PM, Igor Katkov wrote:
>> 2. Is there a way to control key distribution, for the cases when
>> hard-drives are of different capacity?
>
> No. (That wouldn't be hard to add, but nobody's needed it.)
This certai
wrote:
> At Mon, 28 Sep 2009 17:27:35 -0500,
> Michael Greene wrote:
>>
>> This is a new thread continued from the Facebook-usage thread.
>>
>
> sure
>
>> Cassandra automatically shards your data based on the Partitioner you
>> have setup in storag
This is a new thread continued from the Facebook-usage thread.
Cassandra automatically shards your data based on the Partitioner you
have setup in storage-conf.xml. The copies are controlled by the
ReplicationFactor setting in the same configuration file. If all your
nodes are in the same data c
You must have been talking to the wrong developers.
Facebook open-sourced Cassandra in early 2008. In August 2008 they
wrote about this publically, at
http://www.new.facebook.com/note.php?note_id=24413138919 where they
state:
"First deployment of Cassandra system within Facebook was for the
Inbox
t recommended to use the latest beta
> version?
>
> Joe
>
> On Fri, Sep 25, 2009 at 1:00 PM, Michael Greene
> wrote:
> > They were renamed between 0.3 and 0.4. They are the same thing.
> > See https://issues.apache.org/jira/browse/CASSANDRA-271
> >
>
They were renamed between 0.3 and 0.4. They are the same thing.See
https://issues.apache.org/jira/browse/CASSANDRA-271
Michael
On Fri, Sep 25, 2009 at 2:58 PM, Joe Van Dyk wrote:
> Hi,
>
> In some storage.conf's, I see and in others I see .
>
> Are they the same thing?
>
> --
> Joe Van Dyk
> h
cks for a column, so when there is any other guy
> > changing the data I can get notified. That way I don't need to do
> continuous
> > polling.
> >
> > Is there any functionality right now that I could use to implement this?
> >
> > Thanks
> > -
Thanks for the results. Perhaps you could shed further light:Is this a
single node system?
Is the log level changed from DEBUG to INFO?
Are the commit log and data directories on the same drive?
Are the sets/gets being processed interleaved in parallel, or one then the
other?
Note that writes are
Hector,
Can you describe explicitly what you'd want to see from callouts/triggers?
One of the reasons I advocated for removal is that no one had a need for it
or was working on it in the open source project. What's your scenario?
Michael
On Fri, Sep 25, 2009 at 9:40 AM, Eric Evans wrote:
> On
It has been discussed and there are several proposals on
http://issues.apache.org/jira/browse/CASSANDRA-231I personally like a few of
them. We're still looking for some direction or perhaps a vote -- chime in
if you're interested.
Michael
On Wed, Sep 16, 2009 at 4:26 PM, Sal Fuentes wrote:
> J
Sorry, typo: SlicePredicate
On Sat, Aug 22, 2009 at 8:28 AM, Michael Greene wrote:
> predicate is a SlicePredice object and consistency_level is a
> ConsistencyLevel enum
> It is helpful to look back at the cassandra.thrift definition instead of
> only consuming the generated c
predicate is a SlicePredice object and consistency_level is a
ConsistencyLevel enum
It is helpful to look back at the cassandra.thrift definition instead of
only consuming the generated code. We are working on adding more
documentation to the interface though.
Michael
On Sat, Aug 22, 2009 at 4:2
That's not precisely true. See
https://issues.apache.org/jira/browse/CASSANDRA-44 for techniques that can
be used to modify the current column families. Eventually this will be made
more dynamic.
Michael
On Thu, Aug 20, 2009 at 6:37 PM, Jun Rao wrote:
> You should be aware that Cassandra doesn
re is
> only one call per second."
>
> the internal Cassandra MessagingService uses nonblocking io, but the
> Thrift stuff is just your standard thread pool with blocking sockets.
>
> On Wed, Aug 19, 2009 at 5:32 PM, Huming Wu wrote:
> > On Tue, Aug 18, 2009 at 12:02 P
start and finish in SliceRange are non-optional. Try empty strings.
2009/8/19 Teodor Sigaev :
> Some more news, I added printing of stack trace to perl's client, and I see
> that problem is in getting answer from server, not in sending. It breaks on
> reading of exception (TMessageType::EXCEPTION
According to the HBase guys and confirmed by
http://java.sun.com/javase/technologies/hotspot/gc/gc_tuning_6.html#icms,
on an 8-core machine you are not going to want to enable
-XX:+CMSIncrementalMode -- it is for 1 or 2 core machines that are
using the CMS GC. This should affect your latency numbe
What sort of slicing are you doing? This will impact CPU usage.
Michael
Huming Wu wrote:
> I did some performance test and I am not impressed :). The data set is
> 880K unique keys and there are 4 columns with 2 columns being string
> and the other 2 are integers (from client side, to the backen
and congratulations to Cassandra's local hero, Sammy Yu, who
apparently had the same idea.
On Tue, Aug 11, 2009 at 9:50 PM, Jonathan Ellis wrote:
> Thanks for looking into it, though.
>
> On Tue, Aug 11, 2009 at 10:59 AM, Mark McBride wrote:
>> My shot at hero status has been thwarted, due to a pr
The Java examples are easily portable. For what it's worth, I have been
using C# with Cassandra for awhile. I have some wrapper classes and
connection management code that I'm still working on getting released, but
for testing the code generated by Thrift is largely usable out of the box.
Michael
That's the error that would be printed if you had CompareWith="Name" set,
which is invalid. Valid values for CompareWith are listed in the XML file,
and are:
AsciiType
UTF8Type
BytesType
UUIDType
LongType
Michael
On Sun, Aug 2, 2009 at 10:20 PM, Tom Melendez wrote:
> Is your configuration valid
That's substantially true, yes. Any other utilities built on top of the
original generated C# code will likely fail, or any introspection utilities
expecting those field names, but at the protocol and transport layers (and
on the Java server side) you will see no difference.
Michael
On Wed, Jul
Cassandra does not need Hadoop for functionality and is a "standalone" project.
Hadoop is many things. One of those is HDFS, which as you describe is
a GFS clone. Hadoop also includes a MapReduce implementation, job
tracking, and various other services that a distributed system using
it would ne
columnPath in 0.3 used to be defined as a composite string
"columnFamilyName:columnName" or "columnFamilyName:superColumnName:columnName"
Now in trunk/0.4 it is defined as a ColumnPath struct/object that can
be instanced as Gasol has written below.
Michael
2009/7/23 李楠 :
> and
>
> package org.ap
gt; On Wed, Jul 22, 2009 at 9:36 PM, Michael Greene
> wrote:
>>
>> See this previous discussion of a related topic
>> http://markmail.org/thread/w3mrh4h64xpf3vuj
>>
>> Michael
>>
>> On Wed, Jul 22, 2009 at 11:31 PM, wrote:
>> > I m trying to f
See this previous discussion of a related topic
http://markmail.org/thread/w3mrh4h64xpf3vuj
Michael
On Wed, Jul 22, 2009 at 11:31 PM, wrote:
> I m trying to figure out how to implement a zeitgeist in cassandra
>
> How do we implement the counter, do we need to the get the value increment
> and i
That looks really great, thanks for sharing with us. Can you add that
to http://wiki.apache.org/cassandra/ArticlesAndPresentations ?
Michael
On Mon, Jul 20, 2009 at 12:43 PM, Jun Rao wrote:
> Last Friday, I gave an IEEE talk on an email app that we built on top of
> Cassandra. Below is the link
There's 'snapshot' functionality coming in https://issues.apache.org/jira/browse/CASSANDRA-279
slated for 0.4, but to my knowledge no toolIng in the works for
later using that data. It should be as simple as tar'ing and
restoring somewhere else after that.
Michael
On Jul 19, 2009, at 1:25
If you run 'ant clean' before running ant or Cassandra, it will ensure
that no old artifacts are still around from the code that could be
causing problems.
To dump the db, just delete the db directories. There should be
tooling for this in the future, but that's the most surefire way to
know that
Even if CQL SET allowed for the operation you're describing, it's at
odds with the availability and consistency constrains of Cassandra.
Another process, somewhere else, could be reading and writing that
frequency value at the same time. Reducing the operation to one
statement does not make it tra
02 doesnt trying nodeprobe
>>
>> On Wed, Jul 15, 2009 at 4:03 PM, Anthony Molinaro
>> wrote:
>>>
>>> Alternatively if you are using the 0.3 release you can point a browser
>>> at port 7002 of one of the boxes and should see all the nodes in the
>>
You can use the nodeprobe utility in bin/ to contact each node and
make sure they see the same information. Run it with no arguments to
see the commands you can pass it.
There is also an open issue at
https://issues.apache.org/jira/browse/CASSANDRA-252 for making this a
little more automatic (ins
Cassandra uses many ports in successful operation. As Jonathan
mentions, the bind to (for JMX) was successful. The other
default ports are 7000, 7001, 9160 (used by Cassandra) and 8080 (used
by JMX).
Based what you pasted, your server failed to bind to the storage port
defined in storage-co
Cassandra borrows many concepts from Dynamo, and its paper describes
this well:
http://s3.amazonaws.com/AllThingsDistributed/sosp/amazon-dynamo-sosp2007.pdf
http://wiki.apache.org/cassandra/DataModelAndOperations contains some
documentation that references block_for, but this documentation needs
Not sure about the port issue. You should be able to find all the
defined ports in conf/storage-conf.xml
I filed https://issues.apache.org/jira/browse/CASSANDRA-260 a couple
days ago about the Cli/Cql problem. In a recent check-in, the API for
reading all columns changed, and the Cli/Cql wasn't
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