Hi,
Can anyone please list steps to install and run cassandra in centos.
It can help me to follow and check where i missed and run correctly.
Also, if i wanted to insert some data programmatically, where i need to do
place the code in Fauna.Can anyone help me on this?
On Mon, Apr 12, 2010 at
FYI, G1 has been in 1.6 since u14.
2010/4/13 Peter Schüller sc...@spotify.com:
I'm working on getting our latency as consistent as possible, and the gc
likes to kick off 60+ms periods of unavailability for a node, which for my
application leads to a reasonable number of timed out requests.
Got it, thanks
2010/4/13 Peter Schüller sc...@spotify.com:
FYI, G1 has been in 1.6 since u14.
Yes, but (last time I checked) in a considerably older form. The JDK
1.7 one is more mature.
--
/ Peter Schuller aka scode
I am new to using cassandra. In the documentation I have read, understand,
that as in other non-documentary databases, to update the value of a
key-value tuple, this new value is stored with a timestamp different but
without entirely losing the old value.
I wonder, as I can restore the
Ok, thank you very much for your reply.
I have another question may seem stupid ... Cassandra has a graphical
console, such as mysql for SQL databases?
Regards!
I'm also new to cassandra and about the same question I asked me if using
super columns with one key per version was feasible. Is there limitations to
this use case (or better practices)?
Thank you and best regards,
Bertil Chapuis
On 14 April 2010 09:45, Sylvain Lebresne sylv...@yakaz.com
I think it is still to young, and have to wait or write your self the
graphical console, at least, I don't find any until now.
On Wed, Apr 14, 2010 at 10:04 AM, Bertil Chapuis bchap...@gmail.com wrote:
I'm also new to cassandra and about the same question I asked me if using
super columns with
On Wed, Apr 14, 2010 at 5:13 PM, Zhiguo Zhang mikewolfx...@gmail.com wrote:
I think it is still to young, and have to wait or write your self the
graphical console, at least, I don't find any until now.
Frankly speaking, I'm OK to be without GUI...But I am really
disappointed by those so-called
I'm running a 0.6.0 cluster with four nodes and one of them just crashed.
The logs all seem normal and I haven't seen anything special in the jmx
counters before the crash.
I have one client writing and reading using 10 threads and using 3 different
column families: KvAds, KvImpressions and
I'm confused : don't range queries such as the ones we've been
discussing require using an orderedpartitionner ?
Alright, so distribution depends on your choice of token.
Ah yes, I get it now : with a naive orderedpartitioner, the key is
associated with the node whose token is the closest
The closest is http://github.com/driftx/chiton
On Wed, Apr 14, 2010 at 2:57 AM, Yésica Rey yes...@gdtic.es wrote:
Ok, thank you very much for your reply.
I have another question may seem stupid ... Cassandra has a graphical
console, such as mysql for SQL databases?
Regards!
Hello everyone
We are currently evaluating a new DB system (replacing MySQL) to store
massive amounts of time-series data. The data are various metrics from
various network and IT devices and systems. Metrics i.e. could be CPU usage
of the server xy in percent, memory usage of server xy in MB,
first of all I am a new bee by Non-SQL. I try write down my opinions as
references:
If I were you, I will use 2 columnfamilys:
1.CF, key is devices
2.CF, key is timeuuid
how do u think about that?
Mike
On Wed, Apr 14, 2010 at 3:02 PM, Jean-Pierre Bergamin ja...@ractive.chwrote:
Hello
On Wed, 14 Apr 2010 15:02:29 +0200 Jean-Pierre Bergamin ja...@ractive.ch
wrote:
JB The metrics are stored together with a timestamp. The queries we want to
JB perform are:
JB * The last value of a specific metric of a device
JB * The values of a specific metric of a device between two
Yes, I find that get_range_slices takes an incredibly long time return
the results.
---
Gautam
On Tue, Apr 13, 2010 at 2:00 PM, James Golick jamesgol...@gmail.com wrote:
Hi All,
I'm seeing about 35-50ms to read 1000 columns from a CF using
get_range_slices. The columns are TimeUUIDType with
35-50ms for how many rows of 1000 columns each?
get_range_slices does not use the row cache, for the same reason that
oracle doesn't cache tuples from sequential scans -- blowing away
1000s of rows worth of recently used rows queried by key, for a swath
of rows from the scan, is the wrong call
On Tue, 13 Apr 2010 15:54:39 -0500 Eric Evans eev...@rackspace.com wrote:
EE I leaned into it. An updated package has been uploaded to the Cassandra
EE repo (see: http://wiki.apache.org/cassandra/DebianPackaging).
Thank you for providing the release to the repository.
Can it support a non-root
The inline docs say:
~ The optional KeysCached attribute specifies
~ the number of keys per sstable whose locations we keep in
~ memory in mostly LRU order.
There are a few confusing bits in that sentence.
1. Why is keys per sstable rather than keys per column family. If
I
Right - that make sense. I'm only fetching one row. I'll give it a try with
get_slice().
Thanks,
-James
On Wed, Apr 14, 2010 at 7:45 AM, Jonathan Ellis jbel...@gmail.com wrote:
35-50ms for how many rows of 1000 columns each?
get_range_slices does not use the row cache, for the same reason
On Wed, 2010-04-14 at 06:45 -0300, Jesus Ibanez wrote:
Option 1 - insert data in all different ways I need in order to be
able to query?
Rolling your own indexes is fairly common with Cassandra.
Option 2 - implement Lucandra? Can you link me to a blog or an article
that guides me on how to
On Wed, 2010-04-14 at 10:16 -0500, Ted Zlatanov wrote:
Can it support a non-root user through /etc/default/cassandra? I've
been patching the init script myself but was hoping this would be
standard.
It's the first item on debian/TODO, but, you know, patches welcome and
all that.
--
Eric
On Wed, Apr 14, 2010 at 7:45 AM, Jonathan Ellis jbel...@gmail.com wrote:
35-50ms for how many rows of 1000 columns each?
get_range_slices does not use the row cache, for the same reason that
oracle doesn't cache tuples from sequential scans -- blowing away
1000s of rows worth of recently
If you want to use Cassandra, you should probably store each
historical value as a new column in the row.
On Wed, Apr 14, 2010 at 12:34 AM, Yésica Rey yes...@gdtic.es wrote:
I am new to using cassandra. In the documentation I have read, understand,
that as in other non-documentary databases, to
On Wed, Apr 14, 2010 at 10:31 AM, Mike Malone m...@simplegeo.com wrote:
...
Couldn't you cache a list of keys that were returned for the key range, then
cache individual rows separately or not at all?
By blowing away rows queried by key I'm guessing you mean pushing them
out of the LRU
The values are empty. It's 3000 UUIDs.
On Wed, Apr 14, 2010 at 12:40 PM, Avinash Lakshman
avinash.laksh...@gmail.com wrote:
How large are the values? How much data on disk?
On Wednesday, April 14, 2010, James Golick jamesgol...@gmail.com wrote:
Just for the record, I am able to repeat this
Hi,
What doesn't work with lucandra exactly? Feel free to msg me.
-Jake
On Wed, Apr 14, 2010 at 9:30 PM, Jesus Ibanez jesusiba...@gmail.com wrote:
I will explore Lucandra a little more and if I can't get it to work today,
I will go for Option 2.
Using SQL will not be efficient in the
If you worked with Lucandra in a dedicated searching-purposed cluster, you
could balanced the data very well with some effort.
I think Lucandra is really a great idea, but since it needs
order-preserving-partitioner, does that mean there may be some 'hot-spot'
during searching?
--
View this
Large files can be split into small blocks, and the size of block can be
tuned. It may increase the complexity of writing such a file system, but can
be for general purpose (not only for relative small files)
On Thu, Apr 15, 2010 at 10:08 AM, Tatu Saloranta tsalora...@gmail.comwrote:
On Wed,
On Wed, Apr 14, 2010 at 9:15 PM, Ken Sandney bluefl...@gmail.com wrote:
Large files can be split into small blocks, and the size of block can be
tuned. It may increase the complexity of writing such a file system, but can
be for general purpose (not only for relative small files)
Right,
Exactly. You can split a file into blocks of any size and you can actually
distribute the metadata across a large set of machines. You wouldn't have
the issue of having small files in this approach. The issue maybe the
eventual consistency - not sure that is a paradigm that would be acceptable
for
OPP is not required here. You would be better off using a Random partitioner
because you want to get a random distribution of the metadata.
Avinash
On Wed, Apr 14, 2010 at 7:25 PM, Avinash Lakshman
avinash.laksh...@gmail.com wrote:
Exactly. You can split a file into blocks of any size and you
On Wed, Apr 14, 2010 at 9:26 PM, Avinash Lakshman
avinash.laksh...@gmail.com wrote:
OPP is not required here. You would be better off using a Random
partitioner because you want to get a random distribution of the metadata.
Not required, certainly. However, it strikes me that 1 cluster is
Note: there are glusterfs, ceph, brtfs and luster. there is drbd.
--
View this message in context:
http://n2.nabble.com/Is-that-possible-to-write-a-file-system-over-Cassandra-tp4905111p4905312.html
Sent from the cassandra-u...@incubator.apache.org mailing list archive at
Nabble.com.
On Wed, Apr 14, 2010 at 11:01 PM, Ken Sandney bluefl...@gmail.com wrote:
a fuse based FS maybe better I guess
This has been done, for better or worse, by jdarcy of http://pl.atyp.us/:
http://github.com/jdarcy/CassFS
tried CassFS, but not stable yet, may be a good prototype to start
On Thu, Apr 15, 2010 at 12:15 PM, Michael Greene
michael.gre...@gmail.comwrote:
On Wed, Apr 14, 2010 at 11:01 PM, Ken Sandney bluefl...@gmail.com wrote:
a fuse based FS maybe better I guess
This has been done, for better
Hi,
I want to insert data into Cassandra programmatically in a loop.
Also i'm a newbie to Linux world and Github. Started to work on Linux for
only reason to implement Cassandra.Digging Cassandra for last on week.How to
insert data in cassandra and test it?
Can anyone help me out on this?
-
try this
https://wiki.fourkitchens.com/display/PF/Using+Cassandra+with+PHP
On Thu, Apr 15, 2010 at 12:23 PM, Nirmala Agadgar nirmala...@gmail.comwrote:
Hi,
I want to insert data into Cassandra programmatically in a loop.
Also i'm a newbie to Linux world and Github. Started to work on
There is a tutorial here:
* http://www.sodeso.nl/?p=80
This page includes data inserts:
* http://www.sodeso.nl/?p=251
Like:
c.setColumn(new Column(email.getBytes(utf-8), ronald (at)
sodeso.nl.getBytes(utf-8), timestamp))
columns.add(c);
The Sample code is attached to that blog post.
On
Hi,
I'm using ruby client as of now. Can u give details for ruby client.Also if
possible java client.
Thanks for reply.
-
Nirmala
On Thu, Apr 15, 2010 at 10:02 AM, richard yao richard.yao2...@gmail.comwrote:
try this
https://wiki.fourkitchens.com/display/PF/Using+Cassandra+with+PHP
On
I am having a try on cassandra, and I use php to access cassandra by thrift
API.
I got an error like this:
TException: Error: TSocket: timed out reading 1024 bytes from
10.1.1.27:9160
What's wrong?
Thanks.
Lucandra spreads the data randomly by index + field combination so you do
get some distribution for free. Otherwise you can use nodetool
loadbalance to alter the token ring to alleviate hotspots.
On Thu, Apr 15, 2010 at 2:04 AM, HubertChang hui...@gmail.com wrote:
If you worked with Lucandra
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