It exists other tools than jhat to browse a heap dump, which stream
the heap dump instead of loading it full in memory like jhat do.
Kind regards,
Benoit.
2010/4/3 Weijun Li :
> I'm running a test to write 30 million columns (700bytes each) to Cassandra:
> the process ran smoothly for about 20mi
Just added this to the wiki as it seemed a very frequent request on
irc: http://wiki.apache.org/cassandra/MultinodeCluster
Would very much appreciate feedback and edits to improve it.
b
Thank you Benoit. I did a search but couldn't find any that you mentioned.
Both jhat and netbean load entire map file int memory. Do you know the name
of the tools that requires less memory to view map file?
Thanks,
-Weijun
On Sat, Apr 3, 2010 at 12:55 AM, Benoit Perroud wrote:
> It exists othe
Have a look at either Eclipse Memory Analyser (they have a standalone
version of the memory analyser) or YourKit Java Profiler (commercial,
but with evaluation license). I successfully load and browse heap
bigger than the available memory on the system.
Regards,
Benoit
2010/4/3 Weijun Li :
> Tha
Eclipse Memory Analyser rocks! Thanks a lot!!
-Weijun
On Sat, Apr 3, 2010 at 2:25 AM, Benoit Perroud wrote:
> Have a look at either Eclipse Memory Analyser (they have a standalone
> version of the memory analyser) or YourKit Java Profiler (commercial,
> but with evaluation license). I successfu
Hi,
Nice work.
I guess just a small mistake :
the second 192.168.1.1 should be
192.168.2.34
And I would suggest to add a small part on making the thrift interface
listening on more than localhost.
Kind regards,
Benoit.
2010/4/3 Benjamin Black :
> Just added this to the wiki as it seemed a ver
ello.
A bug occurs for me when working with Cassandra.
With this e-mail I intend to show what I do to recreate it, and then perhaps
you can try it out too.
SUMMARY OF THE BUG:
(1): insert a row with a supercolumn that contains a subcolumn.
(2) remove the supercolumn.
(3) reinsert the sa
Does anyone have solve the problem?I encounter the same error too.
On Mon, Mar 29, 2010 at 12:12 AM, Benoit Perroud wrote:
> I got the same error when the nodes are using lot of I/O, i.e during
> compaction.
>
> 2010/3/28 Eric Yu :
> > I have not restart my nodes.
> > OK, may be I should give 0.
My guess is that the servers I use have not enough I/O nor CPU power.
I run on a virtualized env, and even the vmstat command lag a lot.
But it do not appears that the overall application behavior is
degraded by this error, only the "eventually" takes a little longer.
--
Kind regads,
Benoit.
20
Thank you! Updated.
On Sat, Apr 3, 2010 at 2:57 AM, Benoit Perroud wrote:
> Hi,
>
> Nice work.
> I guess just a small mistake :
>
> the second 192.168.1.1 should be
> 192.168.2.34
>
> And I would suggest to add a small part on making the thrift interface
> listening on more than localhost.
>
> K
Ben,
Great, was looking for something like this just the other day. One question I'm
still unclear on, when setting up multiple nodes, say 4-8 (or more) what's the
suggested ratio of seed vs. non-seed nodes?
thanks,
Joe
On Apr 3, 2010, at 1:14 AM, Benjamin Black wrote:
> Just added this to th
Seeds are used for ring discovery, so there really isn't a load
concern for them, afaict. Have enough to meet your availability
needs, including placement, and rock out.
On Sat, Apr 3, 2010 at 9:01 AM, Joseph Ruscio wrote:
> Ben,
>
> Great, was looking for something like this just the other day.
We use anywhere from 3-5 seeds for clusters that have over 150 nodes. That
should suffice for larger sizes too since they are only for initial
discovery.
Avinash
On Sat, Apr 3, 2010 at 9:19 AM, Benjamin Black wrote:
> Seeds are used for ring discovery, so there really isn't a load
> concern for
On Apr 2, 2010, at 4:49 PM, Masood Mortazavi wrote:
> Is there a ready recipe for deploying a Cassandra cluster in AWS? ... (Seeds
> need some "fixed" IP addresses.)
We have a lot of code around this that we're trying to get released. We have a
rack aware strategy for cross-AZ clusters. We als
For the past week or so I've been developing (another) Scala based high
level Cassandra client - Cascal. While I know there's several other (good
quality) clients I thought developing my own would be a great way to
familiarize myself with Cassandra as part of my analysis at work (which it
was!).
W
Woot. Ver much looking forward to this stuff Joe.
On Sat, Apr 3, 2010 at 10:14 AM, Joe Stump wrote:
>
> On Apr 2, 2010, at 4:49 PM, Masood Mortazavi wrote:
>
> > Is there a ready recipe for deploying a Cassandra cluster in AWS? ...
> (Seeds need some "fixed" IP addresses.)
>
> We have a lot of c
IMO the "right" way to do it is to configure your machines so that
autodetecting listenaddress Just Works, so you can deploy exactly the
same config to all nodes.
On Sat, Apr 3, 2010 at 3:14 AM, Benjamin Black wrote:
> Just added this to the wiki as it seemed a very frequent request on
> irc: htt
I do not claim it is the best/right way, just the one least likely to go wrong.
On Sat, Apr 3, 2010 at 12:10 PM, Jonathan Ellis wrote:
> IMO the "right" way to do it is to configure your machines so that
> autodetecting listenaddress Just Works, so you can deploy exactly the
> same config to all
Your git page looks great, I like your cassandra explanation and graphic. Is
that the 3rd scala library now? Scala must be growing. Too much strange
punctuation for me but its good to have a viable functional language for the
JVM.
From: chris.shorr..
On Sat, Apr 3, 2010 at 6:40 PM, Avinash Lakshman
wrote:
> We use anywhere from 3-5 seeds for clusters that have over 150 nodes. That
> should suffice for larger sizes too since they are only for initial
> discovery.
would it make sense to just use a round robin dns on the available
nodes and use
Seems like a lot of complexity for a very small win (how often do you
bootstrap new nodes? if you only need a handful of seeds, what's all
that hard about listing them all on all nodes?). I prefer simple and
predictable, and trying to do this with round robin DNS seems to be
neither, to me.
b
We are looking to take advantage of this as Well. Please let us know when it
is ready.
Lenin
On Sat, Apr 3, 2010 at 11:32 AM, Peter Chang wrote:
> Woot. Ver much looking forward to this stuff Joe.
>
>
> On Sat, Apr 3, 2010 at 10:14 AM, Joe Stump wrote:
>
>>
>> On Apr 2, 2010, at 4:49 PM, Masoo
I can see the logic of having an internal DNS entry '
seednodes.internaldomain.com',
this might only have 3 defined seed nodes out of 100, but the benefit is
single point configuration, no need to edit configs across 100 machines,
easily redefinable on the fly as needed...
On Sat, Apr 3, 2010 at 1
What happens if the IP I get back is for a seed that happens to be
down right then?
And then that IP is cached locally by my resolver?
There is certainly a tempting conceptual simplicity to using DNS, I
just don't think the reality is that simple nor is it for the trade in
predictability, for me.
What specific features are you looking for to operate on EC2?
b
On Sat, Apr 3, 2010 at 1:37 PM, Lenin Gali wrote:
> We are looking to take advantage of this as Well. Please let us know when it
> is ready.
>
> Lenin
>
> On Sat, Apr 3, 2010 at 11:32 AM, Peter Chang wrote:
>>
>> Woot. Ver much lo
I don't think Lazyboy exposes range queries [that is, iterating rows
whose keys you do not know ahead of time]. Pycassa does, though.
On Thu, Apr 1, 2010 at 12:05 PM, Gary wrote:
> I am trying out the lazyboy library to access cassandra, I was able to get
> the data in and out using Record save/
On Apr 3, 2010, at 1:53 PM, Benjamin Black wrote:
> What specific features are you looking for to operate on EC2?
It seemed people weren't looking for features, but tools to help with the
management. The two things we've created that people might be interested in are:
1. An EC2-specific rack-a
On Apr 3, 2010, at 2:00 PM, Jonathan Ellis wrote:
> I don't think Lazyboy exposes range queries [that is, iterating rows
> whose keys you do not know ahead of time]. Pycassa does, though.
I think ieure's fork has itertools support that will let you do crazy iteration
stuff with it. I haven't d
I'm pretty familiar with EC2, hence the question. I don't believe any
patches are required to do these things. Regardless, as I noted in
that ticket, you definitely do NOT need AWS credentials to determine
your availability zone. It is available through the metadata web
server for each instance
On Apr 3, 2010, at 2:54 PM, Benjamin Black wrote:
> I'm pretty familiar with EC2, hence the question. I don't believe any
> patches are required to do these things. Regardless, as I noted in
> that ticket, you definitely do NOT need AWS credentials to determine
> your availability zone. It is
Hi everyone,
At my work we are in the early stages of moving our data which lives on EC2
machines from a Flare/memcache system to Cassandra so your chat has been
interesting to me.
I realize that this might complicate things and make things less "simple" but
would it be useful for the nodes th
Right, you determine AZ by looking at the metadata. us-east-1a is a
different AZ from us-east-1b. You can't infer anything beyond that,
either with the AWS API or guesses about IP addressing. My EC2 snitch
recipe builds a config file for the property snitch that treats AZs
like racks (just break
On Sat, Apr 3, 2010 at 3:41 PM, Mike Gallamore
wrote:
>
> Useful things that nodes could advertise:
>
> data-centre they are in,
This is what the snitches do.
> performance info: mem, CPU etc (these could be used to more intelligently
> decide how to partition the data that the new node gets fo
Hi Benjamin,
Thanks for the reply.
On 2010-04-03, at 8:12 PM, Benjamin Black wrote:
> On Sat, Apr 3, 2010 at 3:41 PM, Mike Gallamore
> wrote:
>>
>> Useful things that nodes could advertise:
>>
>> data-centre they are in,
>
> This is what the snitches do.
Cool.
>
>> performance info: mem, CPU
What version do you use? i think that bug was fixed in .6
https://issues.apache.org/jira/browse/CASSANDRA-703
Regards,
On Sat, Apr 3, 2010 at 5:27 AM, Arash Bazrafshan wrote:
> ello.
>
> A bug occurs for me when working with Cassandra.
>
> With this e-mail I intend to show what I do to
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