Okay, so now my row cache hit rate jumps between 1.0, 99.5, 95.6, and NaN.
Seems like that stat is a little broken.
Still seeing around 35ms to multiget 20 rows.
- James
On Tue, Mar 30, 2010 at 9:22 PM, Ryan King wrote:
> On Tue, Mar 30, 2010 at 9:11 PM, James Golick
> wrote:
> > No change ob
On Tue, Mar 30, 2010 at 9:11 PM, James Golick wrote:
> No change observed. The hit rate fluctuates between 0.0, 0.3, and NaN every
> time I run cfstats.
> I just increased it by 10x. Hopefully that'll help.
You should turn the caches up until you either run out of heap, or the
hitrate stops going
No change observed. The hit rate fluctuates between 0.0, 0.3, and NaN every
time I run cfstats.
I just increased it by 10x. Hopefully that'll help.
On Tue, Mar 30, 2010 at 8:59 PM, Jonathan Ellis wrote:
> What is your row cache hit rate?
>
> By "still slow" do you mean "no change observed" or "
What is your row cache hit rate?
By "still slow" do you mean "no change observed" or "faster but not
fast enough?"
On Tue, Mar 30, 2010 at 10:47 PM, James Golick wrote:
> We are starting to use cassandra to power our activity feed. The way we
> organize our data is simple. "Event"s live in a CF
We are starting to use cassandra to power our activity feed. The way we
organize our data is simple. "Event"s live in a CF called Events and are
keyed by a UUID. The timelines themselves live in a CF called Timelines,
which is keyed by user id (i.e. "1229") and contains a event uuids as column
name
Hard to say without busting out the profiler. "supercolumns are
slower" is not a surprise to anyone at this point, I'm afraid.
On Tue, Mar 30, 2010 at 6:16 PM, Carlos Sanchez
wrote:
> I was wondering if I could have a bit more insight as why we are seeing
> different insertion times between reg
Thanks David and Jonathan for the info.
Those two links were pretty much the only thing that I did find about this
issue, but is wasn't
sure that only because it works for different zones it would also work for
different regions.
--
Regards Erik
How far apart are the data centers? Technically there will be an increase in
latency for the writes if you are waiting for acks from the replicas. How
long does it for simple pings between machines in these data centers? If
inconsistency is not an issue you can mitigate this by doing asynchronous
r
http://permalink.gmane.org/gmane.comp.db.cassandra.user/3462
http://permalink.gmane.org/gmane.comp.db.cassandra.user/3483
On Tue, Mar 30, 2010 at 7:49 PM, Erik Holstad wrote:
> Is anyone using datacenter aware replication where the replication takes
> place over the wan
> and not over super fast
On 2010-03-31 01:42, Erik Holstad wrote:
> I'm not too worried about inconsistency in data too much more if things
> like the gossip protocol would saturate the wan and things like that.
I haven't tried inter-DC replication, but I would be surprised if gossip
saturated a line with any decent bandw
Your ConsistencyLevel will change the effect. If CL is low, inconsistency will
temporarily occur between the DCs. If CL is high, writes will have noticeably
high latency.
-Original Message-
From: Erik Holstad
Date: Tue, 30 Mar 2010 17:49:17
To:
Subject: Replicating data over the wan?
Is anyone using datacenter aware replication where the replication takes
place over the wan
and not over super fast optical cable between the centers?
Tried to look at all posts related to the topic but haven't really found too
much, only some things
about not doing that if using ZooKeeper and som
I was wondering if I could have a bit more insight as why we are seeing
different insertion times between regular column families and super columns.
We have a group object (with its name) that may have a series of attributes
(name/value). There can be up a million group object and different grou
Well, the app is written in PHP, and in order to use Cassandra for the
(small) aspect of the app which could make use of its' benefits, the
client code will need to be in PHP and run fairly speedily.
Hence my testing with PHP.
I suppose another question for me is: Are there any alternative
interf
Thanks for the detailed explanation David. I had a feeling it was to
do with random vs sequential IO, and now I'm comfortable with that
concept w.r.t Cassandra.
On Tue, Mar 30, 2010 at 11:59 PM, David Strauss wrote:
> On 2010-03-30 05:54, Julian Simon wrote:
>> My understanding is that Cassand
Apologies if you received multiple copies of this message.
=
CALL FOR PAPERS
5th Workshop on
Virtualization in High-Performance Cloud Computing
VHPC'10
as part of Euro-Par 2010, Island of Ischia-Naples, Italy
==
Cassandra does "minor" compactions with a minimum of 4 sstables in the
same "bucket," with buckets doubling in size as you compact. So you
only ever rewrite all data in your weekly-ish major compaction for
tombstone cleanup and anti entropy.
-Jonathan
On Tue, Mar 30, 2010 at 12:54 AM, Julian Sim
On Mon, Mar 29, 2010 at 10:31 AM, Matthew Stump wrote:
> Am I crazy to want to switch our server's primary data store from postgres to
> cassandra? This is a system used by banks and governments to store crypto
> keys which absolutely can not be lost.
Back to original question: in my completel
On Mon, 29 Mar 2010 10:31:06 -0700 Matthew Stump wrote:
MS> Am I crazy to want to switch our server's primary data store from
MS> postgres to cassandra? This is a system used by banks and
MS> governments to store crypto keys which absolutely can not be lost.
Run a test pilot for N months (depe
On 2010-03-30 12:51, yaw wrote:
> I have seen your guide at
> https://wiki.fourkitchens.com/display/PF/Using+Cassandra+with+PHP.
>
> I use Cassandra with a PHP client ..
> Until now, I am using Thrift PHP classes that I found into Pandra
> project (high level PHP client) as I was unable to instal
On 2010-03-30 05:54, Julian Simon wrote:
> My understanding is that Cassandra never updates data "in place" on
> disk - instead it completely re-creates the data files during a
> "flush". Stop me if I'm wrong already ;-)
You're correct that existing SSTables are immutable; they are retired
follow
Hi David,
I have seen your guide at
https://wiki.fourkitchens.com/display/PF/Using+Cassandra+with+PHP.
I use Cassandra with a PHP client ..
Until now, I am using Thrift PHP classes that I found into Pandra project
(high level PHP client) as I was unable to install or build thrift compiler
on my o
This sounds like the sort of analysis that shouldn't be done in PHP. Have you
tried Hadoop + Cassandra 0.6?
-Original Message-
From: Julian Simon
Date: Tue, 30 Mar 2010 22:21:22
To:
Subject: Re: Poor performance; PHP & Thrift to blame
Yes I tested it with and without APC - it had a ne
Yes I tested it with and without APC - it had a negligible impact on
performance.
This didn't surprise me - most of the optimization that APC offers is
in the parsing of PHP code; seeing as the benchmark is a single PHP
process the code parsing overhead occurs outside the benchmark loop.
Does any
Without APC, there should be even more of an improvement with the Thrift PHP
extension.
- "Rauan Maemirov" wrote:
> What about APC? Did you turn it on?
>
> 2010/3/30 Julian Simon :
> > Hi,
> >
> > I've been trying to benchmark Cassandra for our use case and have
> been
> > seeing poor perf
What about APC? Did you turn it on?
2010/3/30 Julian Simon :
> Hi,
>
> I've been trying to benchmark Cassandra for our use case and have been
> seeing poor performance on both writes and (extremely) poor
> performance on reads.
>
> Using Cassandra 0.51 stable & thrift-0.2.0.
>
> It turns out all t
26 matches
Mail list logo
