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From Jonathan Haddad <...@jonhaddad.com>
Subject Re: CQL and undefined columns
Date Mon, 05 Aug 2013 20:57:39 GMT
If you expected your CQL3 query to work, then I think you've missed the
point of CQL completely.  For many of us, adding in a query layer which
gives us predictable column names, but continues to allow us to utilize
wide rows on disk is a huge benefit.  Why would I want to reinvent a system
for structured data when the DB can handle it for me?  I get a bunch of
stuff for free with CQL, which decreases my development time, which is the
resource that I happen to be the most bottlenecked on.

Feel free to continue to use thrift's wide row structure, with ad hoc
columns.  No one is stopping you.



On Mon, Aug 5, 2013 at 1:36 PM, Edward Capriolo <edlinuxguru@gmail.com>wrote:

> "COMPACT STORAGE imposes the limit that you can't add columns to your
> tables."
>
> Is absolutely false. If anything CQL is imposing the limits!
>
> Simple to prove. Try something like this:
>
> create table abc (x int);
> insert into abc (y) values (5);
>
> and watch CQL reject the insert saying something to the effect of 'y?
> whats that? Did you mean CQL2 OR 1.5?, or hamburgers'
>
> Then go to the Cassandra cli and do this:
> create column family abd;
> set ['abd']['y']= '5';
> set ['abd']['z']='4';
>
> AND IT WORKS!
>
> I noticed the nomenclature starting to spring up around the term "legacy
> tables" and docs based around "can't do with them". Frankly it makes me
> nuts because...
>
> This little known web company named google produced a white paper about
> what a ColumnFamily data model could do
> http://en.wikipedia.org/wiki/BigTable . Cassandra was build on the
> BigTable/ColumnFamily data model. There was also this big movement called
> NoSQL, where people wanted to break free of query languages and rigid
> schema's....
>
>
>
>
>
>
>
> On Mon, Aug 5, 2013 at 1:56 PM, Jonathan Haddad <jon@jonhaddad.com> wrote:
>
>> The CQL docs recommend not using it - I didn't just make that up.  :)
>>  COMPACT STORAGE imposes the limit that you can't add columns to your
>> tables.  For those of us that are heavy CQL users, this limitation is a
>> total deal breaker.
>>
>>
>> On Mon, Aug 5, 2013 at 10:27 AM, Robert Coli <rcoli@eventbrite.com>wrote:
>>
>>> On Wed, Jul 31, 2013 at 3:10 PM, Jonathan Haddad <jon@jonhaddad.com>wrote:
>>>
>>>> It's advised you do not use compact storage, as it's primarily for
>>>> backwards compatibility.
>>>>
>>>
>>> Many Apache Cassandra experts do not advise against using COMPACT
>>> STORAGE. [1] Use CQL3 non-COMPACT STORAGE if you want to, but there are
>>> also valid reasons to not use it. Asserting that there is some good reason
>>> you should not use COMPACT STORAGE (other than range ghosts?) seems
>>> inaccurate. :)
>>>
>>> =Rob
>>> [1]
>>> http://www.edwardcapriolo.com/roller/edwardcapriolo/entry/legacy_tables
>>>
>>
>>
>>
>> --
>> Jon Haddad
>> http://www.rustyrazorblade.com
>> skype: rustyrazorblade
>>
>
>


-- 
Jon Haddad
http://www.rustyrazorblade.com
skype: rustyrazorblade

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