I'm running the nodes with a JVM heap size of 6GB, and here are the
related options from my storage-conf.xml. As mentioned in the first
email, I left everything at the default value. I briefly googled
around for Cassandra performance tuning etc but haven't found a
definitive guide ... any help
Do you see one of the disks used by cassandra filled up when a node crashes?
On Tue, Apr 6, 2010 at 9:39 AM, Ilya Maykov ivmay...@gmail.com wrote:
I'm running the nodes with a JVM heap size of 6GB, and here are the
related options from my storage-conf.xml. As mentioned in the first
email, I
No, the disks on all nodes have about 750GB free space. Also as
mentioned in my follow-up email, writing with ConsistencyLevel.ALL
makes the slowdowns / crashes go away.
-- Ilya
On Mon, Apr 5, 2010 at 11:46 PM, Ran Tavory ran...@gmail.com wrote:
Do you see one of the disks used by cassandra
You are blowing away the mostly saner JVM_OPTS running it that way.
Edit cassandra.in.sh (or wherever config is on your system) to
increase mx to 4G (not 6G, for now) and leave everything else
untouched and do not specify JVM_OPTS on the command line. See if you
get the same behavior.
b
On
On Mon, Apr 5, 2010 at 5:10 PM, Paul Prescod p...@ayogo.com wrote:
On Mon, Apr 5, 2010 at 4:48 PM, Tatu Saloranta tsalora...@gmail.com wrote:
...
I would think that there is also possibility of losing some
increments, or perhaps getting duplicate increments?
I believe that with vector
On 4/5/10 11:48 PM, Ilya Maykov wrote:
No, the disks on all nodes have about 750GB free space. Also as
mentioned in my follow-up email, writing with ConsistencyLevel.ALL
makes the slowdowns / crashes go away.
I am not sure if the above is consistent with the cause of #896, but the
other
Yes, no problem with my live Cassandra server.
Thanks, Jonathan.
On Mon, Apr 5, 2010 at 11:19 PM, Jonathan Ellis jbel...@gmail.com wrote:
On Mon, Apr 5, 2010 at 9:11 PM, JKnight JKnight beukni...@gmail.com
wrote:
Thanks Jonathan,
When I run nodeprobe flush with parameter -host is
This may be the blind leading the blind...
On Mon, Apr 5, 2010 at 11:54 PM, Tatu Saloranta tsalora...@gmail.comwrote:
...
I think the key is that this is not automatic -- there is no general
mechanism for aggregating distinct modifications. Point being that you
could choose one amongst right
That does sound similar. It's possible that the difference I'm seeing
between ConsistencyLevel.ZERO and ConsistencyLevel.ALL is simply due
to the fact that using ALL slows down the writers enough that the GC
can keep up. I could do a test with multiple clients writing at ALL in
parallel tomorrow.
Right, I meant 4GB heap vs. the standard 1GB. And all other options in
cassandra.in.sh at their defaults.
Sorry I am a bit new to JVM tuning, and very new to Cassandra :)
-- Ilya
On Tue, Apr 6, 2010 at 12:16 AM, Benjamin Black b...@b3k.us wrote:
I am specifically suggesting you NOT use a heap
On Tue, Apr 6, 2010 at 2:10 AM, Paul Prescod p...@ayogo.com wrote:
On Mon, Apr 5, 2010 at 4:48 PM, Tatu Saloranta tsalora...@gmail.com wrote:
...
I would think that there is also possibility of losing some
increments, or perhaps getting duplicate increments?
I believe that with vector
Another option is to use a SuperColumnFamily, but that extends the depth
of all such values to be arrays. The name and age columns would
therefore also need to be SuperColumns -- just with a single sub-column
each.
Like many things in Cassandra, the preferred storage method depends on
your
hi:
i want to take some experiments on cassandra by java, but when i write
client,a mistake can not convert int to ConsistencyLevel appear, so how can
i solve ? thanks very much.
This means you rebuilt the Thrift code with an old compiler.
If you look in lib/ the thrift jar is tagged with the svn revision we
built with. Thrift has frequent regressions, so using that same revision
is the best way to avoid unpleasant surprises.
On Tue, Apr 6, 2010 at 4:34 AM, 叶江
On Tue, Apr 6, 2010 at 2:13 AM, Ilya Maykov ivmay...@gmail.com wrote:
That does sound similar. It's possible that the difference I'm seeing
between ConsistencyLevel.ZERO and ConsistencyLevel.ALL is simply due
to the fact that using ALL slows down the writers enough that the GC
can keep up.
On Mon, Apr 5, 2010 at 6:48 PM, Tatu Saloranta tsalora...@gmail.com wrote:
I would think that there is also possibility of losing some
increments, or perhaps getting duplicate increments?
It is not just isolation but also correctness that is hard to maintain
but correctness also. This can be
From what I read in another thread, Cassandra isn't used for isn't 'ideal'
for keeping track of counts.
For example, I would undertand this to mean keeping track of which stories
were dugg.
If this is true, how would a site like digg keep track of the 'dugg'
counter?
Also, I am assuming with
Hi all...
I am having a pretty tough time retrieving binary values out of my DB...
I am using cassandra 0.5.1 on Centos 5.4 with java 1.6.0-19
Here is the simple test I am trying to run in C++
/* snip initialization */
{
transport-open();
ColumnPath new_col;
Chris,
When you so patch, does that mean for Cassandra or your own internal
codebase?
Sounds interesting thanks!
On Tue, Apr 6, 2010 at 12:54 PM, Chris Goffinet goffi...@digg.com wrote:
That's not true. We have been using the Zookeper work we posted on jira.
That's what we are using
http://issues.apache.org/jira/browse/CASSANDRA-704
http://issues.apache.org/jira/browse/CASSANDRA-721
We have our own internal codebase of Cassandra at Digg. But we are using those
above patches until we have the vector clock work cleaned up, that patch will
also goto jira. Most likely the
On Tue, Apr 6, 2010 at 8:06 AM, Shuge Lee shuge@gmail.com wrote:
'girls': pickle.dumps(['java', 'actionscript', 'python'])
I think this is a really bad idea, I can't do any search if using Pickle.
Just to be sure: are you thinking of traditional queries, lookups by
values (find entries
On Tue, Apr 6, 2010 at 10:12 AM, Steve sjh_cassan...@shic.co.uk wrote:
On 06/04/2010 15:26, Eric Evans wrote:
...
I've read all about QUORUM, and it is generally useful, but as far as I
can tell, it can't give me a transaction...
Correct. Only individual operations are atomic, and ordering of
On Tue, Apr 6, 2010 at 8:17 AM, Jonathan Ellis jbel...@gmail.com wrote:
On Tue, Apr 6, 2010 at 2:13 AM, Ilya Maykov ivmay...@gmail.com wrote:
That does sound similar. It's possible that the difference I'm seeing
between ConsistencyLevel.ZERO and ConsistencyLevel.ALL is simply due
to the fact
On Tue, Apr 6, 2010 at 8:45 AM, Mike Malone m...@simplegeo.com wrote:
As long as the conflict resolver knows that two writers each tried to
increment, then it can increment twice. The conflict resolver must know
about the semantics of increment or decrement or string append or
binary patch or
Seems to be internal to java/cassandra itself.
I have some tests and I want to make sure that I have a clean slate
each time I run the test. Clean as far as my code cares is that value
is not defined. I'm running bin/cassandra -f with the default
install/options. So at the beginning of my
On 06/04/2010 18:50, Benjamin Black wrote:
I'm finding this exchange very confusing. What exactly about
Cassandra 'looks absolutely ideal' to you for your project? The write
performance, the symmetric, peer to peer architecture, etc?
Reasons I like Cassandra for this project:
*
On 06/04/2010 18:53, Tatu Saloranta wrote:
I've read all about QUORUM, and it is generally useful, but as far as I
can tell, it can't give me a transaction...
Correct. Only individual operations are atomic, and ordering of
insertions is not guaranteed.
As I thought.
I think there
On Tue, Apr 6, 2010 at 9:11 AM, Paul Prescod pres...@gmail.com wrote:
This may be the blind leading the blind...
On Mon, Apr 5, 2010 at 11:54 PM, Tatu Saloranta tsalora...@gmail.com
wrote:
...
I think the key is that this is not automatic -- there is no general
mechanism for aggregating
Hello I tried to post this earlier but something seems to have gone wrong
with sending the message.
I have a test perl script that I'm using to test the behaviour of some of my
existing code. It is important that the values start in a clean state at
the beginning of the tests, as I'm
On Tue, 06 Apr 2010 11:07:03 -0700 Mike Gallamore
mike.e.gallam...@googlemail.com wrote:
MG Seems to be internal to java/cassandra itself.
MG I have some tests and I want to make sure that I have a clean slate
MG each time I run the test. Clean as far as my code cares is that
MG value is not
On Tue, 06 Apr 2010 13:24:45 -0700 Mike Gallamore
mike.e.gallam...@googlemail.com wrote:
MG Thanks for the reply. The newest version of the module I see on CPAN
MG is 0.08b. I actually had 0.07 installed and am using 0.6beta3 for
MG cassandra. Is there somewhere else I should look for the 0.09
On Tue, Apr 6, 2010 at 11:03 AM, Tatu Saloranta tsalora...@gmail.comwrote:
On Tue, Apr 6, 2010 at 8:45 AM, Mike Malone m...@simplegeo.com wrote:
As long as the conflict resolver knows that two writers each tried to
increment, then it can increment twice. The conflict resolver must know
On 04/06/2010 01:36 PM, Ted Zlatanov wrote:
On Tue, 06 Apr 2010 13:24:45 -0700 Mike
Gallamoremike.e.gallam...@googlemail.com wrote:
MG Thanks for the reply. The newest version of the module I see on CPAN
MG is 0.08b. I actually had 0.07 installed and am using 0.6beta3 for
MG cassandra. Is
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