Cassandra handles this by using a different design, you don't append
anything. You use the fact that in Cassandra you have dynamic columns
and you make a new column every time you want to put more data in. Then
when you do finally need to read the data out you read out a slice of
columns, not jus
D
- Original Message -
From: Jonathan Ellis [mailto:jbel...@gmail.com]
Sent: Tuesday, May 31, 2011 09:57 PM
To: user@cassandra.apache.org
Subject: Re: Appending to fields
Sounds like Ed is right and you should be doing the append as
add-a-new-column instead of overwrite-existing-column
Sounds like Ed is right and you should be doing the append as
add-a-new-column instead of overwrite-existing-column.
On Tue, May 31, 2011 at 8:36 PM, Marcus Bointon
wrote:
> On 31 May 2011, at 23:03, Dan Kuebrich wrote:
>
>> I think perhaps OP meant O(N * M), where N is number of rows and M is to
On 31 May 2011, at 23:03, Dan Kuebrich wrote:
> I think perhaps OP meant O(N * M), where N is number of rows and M is total
> bytes.
That's probably more accurate.
This is what it was doing: Say I repeatedly append 100 bytes to the same 1000
records. First time around that's 100,000 bytes to
On Tue, May 31, 2011 at 5:03 PM, Dan Kuebrich wrote:
>
>
> On Tue, May 31, 2011 at 4:57 PM, Victor Kabdebon <
> victor.kabde...@gmail.com> wrote:
>
>> As Jonathan stated I believe that the insert is in O(N + M), unless there
>> are some operations that I don't know.
>>
>> There are other NoSQL dat
On Tue, May 31, 2011 at 4:57 PM, Victor Kabdebon
wrote:
> As Jonathan stated I believe that the insert is in O(N + M), unless there
> are some operations that I don't know.
>
> There are other NoSQL database that can be used with Cassandra as
> "buffers" for quick access and modification and then
As Jonathan stated I believe that the insert is in O(N + M), unless there
are some operations that I don't know.
There are other NoSQL database that can be used with Cassandra as "buffers"
for quick access and modification and then after the content can be dumped
into Cassandra for long term stor
On Tue, May 31, 2011 at 2:22 PM, Marcus Bointon
wrote:
> mysql reads the entire value of y, appends the data, then writes the whole
> thing back, which unfortunately is an O(n^2) operation.
Actually, this analysis is incorrect. Appending M bytes to N is O(N +
M) which isn't the same as N^2 at al
On Tue, May 31, 2011 at 2:22 PM, Marcus Bointon
wrote:
> I'm wondering how cassandra implements appending values to fields. Since (so
> the docs tell me) there's not really any such thing such thing as an update
> in Cassandra
You've answered your own question.
--
Jonathan Ellis
Project Chair
