hni Rajagopal
>mailto:roshni_rajago...@hotmail.com>>
>Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>"
>mailto:user@cassandra.apache.org>>
>Date: Wednesday, September 19, 2012 6:16 AM
>To: "user@cassandra.apache.org<mailto:user@c
;>
Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>"
mailto:user@cassandra.apache.org>>
Date: Wednesday, September 19, 2012 6:16 AM
To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>"
mailto:user@cassandra.apache.org>>
Hi Folks,
In the relational world, if I needed to model students, courses relationship, I
may have donea students -master tablea course - master tablea bridge table
students-course which gives me the ids to students and the courses they are
taking. This can answer both 'which students take cour
On Tue, Feb 15, 2011 at 3:59 AM, Serdar Irmak wrote:
> Hi,
>
>
>
> In a 3 node named (named A,B,C) setup with replication factor 3 and quorum
> read/write scenario;
>
> suppose a new value of data X is written to A and B but not C with any
> reason, then A wend down and I fired D with the data of
Hi,
In a 3 node named (named A,B,C) setup with replication factor 3 and quorum
read/write scenario;
suppose a new value of data X is written to A and B but not C with any reason,
then A wend down and I fired D with the data of C or with an empty data where
in a case is X is not present in D.
Th
Could you give more details on what you're trying to do? This sounds like a
case where a UUID will give you what you need without needing to lock.
- Tyler
On Tue, Dec 14, 2010 at 10:24 AM, Alvin UW wrote:
> Thanks.
> It is very helpful.
>
> I think I'd like to write to the same column.
>
> Wou
Thanks.
It is very helpful.
I think I'd like to write to the same column.
Would you please give me more details about your last sentence? For example,
why can't I use locking mechanism inside of cassandra?
Thanks.
Alvin
2010/12/13 Aaron Morton
> In your example is a little unclear.
>
> If yo
In your example is a little unclear.
If you are writing to a single row and creating columns with user names. Then
when you read all the columns for row 1 you will get columns called Dan and Ken.
If you are writing to the same column, let's say called user, then *if* they
are send with the sam
Yes, the same timestamp
2010/12/10 Ryan King
> On Fri, Dec 10, 2010 at 12:49 PM, Alvin UW wrote:
> > Hello,
> >
> >
> > I got a consistency problem in Cassandra.
> >
> > Given a column family with a record:Id Name
> > 1David
> >
On Fri, Dec 10, 2010 at 12:49 PM, Alvin UW wrote:
> Hello,
>
>
> I got a consistency problem in Cassandra.
>
> Given a column family with a record: Id Name
> 1 David
>
> There are three backups for this column family.
>
> Assume there
> Assume there are two write operation happens issued by the same application
> by this order: write_one("1", "Dan") ; write_one("1", "Ken").
> What will Read_all("1") get?
Assuming read_all means reading at consistency level ALL, it sees the
latest value ("Ken").
> Assume the above two write ope
Hello,
I got a consistency problem in Cassandra.
Given a column family with a record:Id Name
1David
There are three backups for this column family.
Assume there are two write operation happens issued by the same application
by t
Sounds like http://wiki.apache.org/cassandra/FAQ#change_replication
On Sat, Apr 17, 2010 at 8:17 AM, Gary wrote:
> I had a single-node instance (0.5) that has some data (1 SCF has 1 key and
> about 500k columns). I upgraded the node to 0.6 release yesterday and added
> another 0.6 node to try out
I had a single-node instance (0.5) that has some data (1 SCF has 1 key and
about 500k columns). I upgraded the node to 0.6 release yesterday and added
another 0.6 node to try out clustering. The two nodes seem to work fine
(discovered each other), but reading the data on either node only returns a
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