I am working on version 0.7.6 of cassandra. I have been looking into the code
to identify communication between nodes.
it seems to me that both inter-node and servernode-client communication
happens using thrift protocol, is my understanding correct?
and the gossiper communication takes place
Hi All,
I'm running three cassandra 0.7.4 nodes in a cluster, and I give 2G memory to
each node.
Now, I get the cfstats here:
Keyspace: UserMap
Read Count: 38411
Read Latency: 123.54214613001484 ms.
Write Count: 44155
Write Latency: 0.02341093873853471 ms.
Pending Tasks: 0
Column Family: Map
In order to fully implement the functionality of super columns using
compound columns I need to be able to select multiple column ranges - this
would be functionally equivalent to selecting multiple super columns (and
more!).
I would like to request the following CQL syntax:
SELECT [FIRST N]
Apache Cassandra 0.7.6 is just 2 days old, but it shipped with a bug in the
debian packaging code that prevents the package from being successfully
installed. Since debian packaging is an integral part of the project, 0.7.6-2
comes to fix this issue.
This is the only change[1] that separate
I believe coherence is their name for the TimesTen technology they bought.
TT is an in memory SQL database that can run as a cache for Oracle.
Its totally different from Cassandra. On the one hand it supports
trad SQL whereas Cassandra does not. On the other hand Cassandra is
truly
What consistency are you asking for?
On Fri, May 20, 2011 at 7:42 AM, Dikang Gu dikan...@gmail.com wrote:
Hi All,
I'm running three cassandra 0.7.4 nodes in a cluster, and I give 2G memory
to each node.
Now, I get the cfstats here:
Keyspace: UserMap
Read Count: 38411
Read Latency:
TCP/IP byte over-head v. UDP really isnt that much if your packets are
of any significant size (its 30 bytes).
And as others have pointed out you can easily get more over-head with
worse results trying to reinvent reliable transport on top of UDP.
Remember that TCP/IP has had 30 years of
I use the default consistency level in the hector client, so it should be
QUORUM.
--
Dikang Gu
0086 - 18611140205
On Friday, May 20, 2011 at 4:25 PM, Jeffrey Kesselman wrote:
What consistency are you asking for?
On Fri, May 20, 2011 at 7:42 AM, Dikang Gu dikan...@gmail.com wrote:
Hi All,
On Fri, May 20, 2011 at 9:39 AM, pankajsoni0126
pankajsoni0...@gmail.com wrote:
I am working on version 0.7.6 of cassandra. I have been looking into the code
to identify communication between nodes.
it seems to me that both inter-node and servernode-client communication
happens using thrift
Hi,
I'm trying to play around with 0.8.0-rc1 and counters, and I'm a
little confused.
First question I have is about the definition. A column within a
standard column family cannot be a counter column type?
I had tried the following, with no success.
create column family urlcounts
is there a way to set for a column of the same key a set of value ?
De : Watanabe Maki watanabe.m...@gmail.com
À : user@cassandra.apache.org user@cassandra.apache.org
Envoyé le : Jeu 19 mai 2011, 17h 38min 39s
Objet : Re: selecting data
Cassandra is not a
That's completely wrong.
TimesTen and Coherence are 2 separate products sold by Oracle.
Coherence is a data grid that takes a key/value approach. It is
massively scalable across LAN and WAN.
In terms of comparing Cassandra and Coherence, I wouldn't. Coherence
is a data grid and most often used
Any thoughts on building something like separate DatabaseMetadata api for CQL?
-Original Message-
From: Peter Lin [mailto:wool...@gmail.com]
Sent: Friday, May 20, 2011 5:28 PM
To: user@cassandra.apache.org
Subject: Re: Cassandra Vs. Oracle Coherence
That's completely wrong.
TimesTen and
Hi,
I have a SCF, Key is string, super column is TimeUUID, and several
columns with one column named type, I create secondary index on this
column. I want to have the foliowing query to fetch all super columns along
with all columns.
1. given a specific key
2. given a range of
The following sample:
http://www.datastax.com/dev/blog/whats-new-cassandra-07-secondary-indexes
No longer works with 0.8.0-rc1
I get cannot parse as hex bytes when doing the
Next we add some users:
[default@demo] set users[bsanderson][full_name] = 'Brandon Sanderson';
section
I can confirm
a storage-conf.xml is read just at the starting of cassandra?
is there a way to add a column family dynamically?
BR
De : karim abbouh karim_...@yahoo.fr
À : user@cassandra.apache.org
Envoyé le : Ven 20 mai 2011, 12h 48min 54s
Objet : Re : selecting data
is
AH, I stand corrected. Hard to follow Larry's acquisitions without a scorecard.
On 5/20/11, Peter Lin wool...@gmail.com wrote:
That's completely wrong.
TimesTen and Coherence are 2 separate products sold by Oracle.
Coherence is a data grid that takes a key/value approach. It is
massively
This is how you create it dynamically:
KsDef ksdef = new KsDef();
ksdef.name = ProgKS;
ksdef.replication_factor = 1;
ksdef.strategy_class =
org.apache.cassandra.locator.RackUnawareStrategy;
ListCfDef cfdefs = new ArrayListCfDef();
CfDef cfdef1 = new CfDef();
cfdef1.name = ProgCF1;
Hi all
I was wondering if there might be some way to better communicate known issues.
We do try to track jira issues but at times some slip through or we miss
implications.
Things like the broken repair of specific CFs.
(https://issues.apache.org/jira/browse/CASSANDRA-2670). I know that this
Whenever I hear someone say data is corrupted I panic :) I have seen few
people have reported that but have not seen the real reason for it. Is it a
manual error, config error, bug etc. It will be good to identify why these
things happen so that it can be fixed before it happens in PROD :(
--
From what I know you cannot create secondary indexes on SCF. You should have
gotten this = https://issues.apache.org/jira/browse/CASSANDRA-1813 on index
creation.
On Fri, May 20, 2011 at 6:56 AM, Monkey me monkey1024.pub...@gmail.comwrote:
Hi,
I have a SCF, Key is string, super column is
What's your avg column size and row size? Your read latency in most case will
directly be related to how much you are trying to read. In my experience you
will see high read latency if you have big column size.
--
View this message in context:
Yes.
On Thu, May 19, 2011 at 7:24 PM, Dave Rav daver...@yahoo.com wrote:
Can I use secondary index with any partitioner
1) RandomPartitioner
2) ByteOrderedPartitioner
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra
On Fri, May 20, 2011 at 5:55 AM, Sasha Dolgy sdo...@gmail.com wrote:
First question I have is about the definition. A column within a
standard column family cannot be a counter column type?
Right. https://issues.apache.org/jira/browse/CASSANDRA-2614 is open to
address this but that's going to
You'd need to add a key validation type for 0.8.
On Fri, May 20, 2011 at 9:28 AM, Patrick Julien pjul...@gmail.com wrote:
The following sample:
http://www.datastax.com/dev/blog/whats-new-cassandra-07-secondary-indexes
No longer works with 0.8.0-rc1
I get cannot parse as hex bytes when
Coherence is similar to memcachd (free). It's in memory cache layer on top of
the DB. You as a user need to keep that cache in sync with the DB.
--
View this message in context:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Cassandra-Vs-Oracle-Coherence-tp6375561p6386847.html
There was a bug, it is fixed. It's just a cache, chill.
On May 20, 2011 11:50 AM, mcasandra mohitanch...@gmail.com wrote:
Whenever I hear someone say data is corrupted I panic :) I have seen few
people have reported that but have not seen the real reason for it. Is it
a
manual error, config
Although one can use Coherence as a memory cache layer on top of a DB,
many customer use it in the financial sector as a in-memory key/value
store.
Think of transient data that doesn't need to be saved, but needs to
scale out across hundreds or thousands of nodes.
memcached is making progress,
In my case I started cassandra after sometime with the newer version of it.
I think this occurred because there were some files remained belongs to the
previous version of cassandra and overwritten with the new one.
This is just my thought.
Thanks
Eranda
uh. yeah ... was a bad morning ... cheers
On Fri, May 20, 2011 at 6:57 PM, Jonathan Ellis jbel...@gmail.com wrote:
On Fri, May 20, 2011 at 5:55 AM, Sasha Dolgy sdo...@gmail.com wrote:
First question I have is about the definition. A column within a
standard column family cannot be a counter
Other interesting flavors in a distributed cache terracotta,
gemfire.together with a complex event processing engine. like
OCEP
drives a lot of low latency, high freq trading where nano seconds matter
/***
sent from my android...please pardon occasional typos
another product in the same area is gigaspaces.
On Fri, May 20, 2011 at 1:12 PM, Milind Parikh milindpar...@gmail.com wrote:
Other interesting flavors in a distributed cache terracotta,
gemfire.together with a complex event processing engine. like
OCEP
drives a lot of low
Brandon Williams wrote:
There was a bug, it is fixed. It's just a cache, chill.
There is no time to chill when fighting it in production :) It's good to
know it's fixed.
Another question, when this happens are we able to restore data from replica
nodes?
--
View this message in context:
No data gets lost - * only * thing corrupted is key-cache
On Fri, May 20, 2011 at 10:17 AM, mcasandra mohitanch...@gmail.com wrote:
Brandon Williams wrote:
There was a bug, it is fixed. It's just a cache, chill.
There is no time to chill when fighting it in production :) It's good to
if I use 'RandomPartitioner' and call 'get_indexed_slices'
what do I do with 'start_key'
struct IndexClause { 1: required listIndexExpression expressions 2:
required binary start_key, 3: required i32 count=100, }
Yes.
On Thu, May 19, 2011 at 7:24 PM, Dave Rav
In this case, yes. I was asking for the cases where commit log corruption was
reported.
--
View this message in context:
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Re-Exception-when-starting-tp6383464p6387101.html
Sent from the cassandra-u...@incubator.apache.org mailing
thanks
On Fri, May 20, 2011 at 12:58 PM, Jonathan Ellis jbel...@gmail.com wrote:
You'd need to add a key validation type for 0.8.
On Fri, May 20, 2011 at 9:28 AM, Patrick Julien pjul...@gmail.com wrote:
The following sample:
Has this cluster always been on 0.7.5 or was it upgraded from an
earlier version?
On Thu, May 19, 2011 at 3:26 AM, Wojciech Pietrzok kosci...@gmail.com wrote:
Just checked. Seems to be present in CF on all nodes (in both
datacenters), but are not indexed correctly
On each node I've used
empty byte array for the first call, last key from the previous
resultset afterwards
On Fri, May 20, 2011 at 12:53 PM, Dave Rav daver...@yahoo.com wrote:
if I use 'RandomPartitioner' and call 'get_indexed_slices'
what do I do with 'start_key'
struct IndexClause {
1: required
CASSANDRA-2614 - create Column and CounterColumn in the same column family
when this will be in cassandra
will this be in cassandra 0.8
Look for Fix version on the ticket:
https://issues.apache.org/jira/browse/CASSANDRA-2614.
On Fri, May 20, 2011 at 4:35 PM, Mark Emerson a202...@yahoo.com wrote:
CASSANDRA-2614 - create Column and CounterColumn in the same column family
when this will be in cassandra
will this be in cassandra
hi Ryan:
Thanks for the link.
I read the slides, could you please provide some more details on how the
temporal aggregation is implemented?
do you use time+granularity as the key ? or as column names ?
Thanks
Yang
In reply to this post by Aaron Turner
We have a solution for time series data on
The first love of my open life was cacti. I am going to discuss with
them porting some of the system to cassandra.
On Friday, May 20, 2011, yangyangyyy tedd...@gmail.com wrote:
hi Ryan:
Thanks for the link.
I read the slides, could you please provide some more details on how the
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