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From Lance Norskog <goks...@gmail.com>
Subject Re: uuid, COMB uuid, distributed farms
Date Wed, 05 Jan 2011 03:15:07 GMT
'NOT NULL' in the schema is 'required=true' in a <field> element.
'Search for NOT NULL' is a little odd: you search for a range and then
negate the search, meaning for documents with nothing in that field.
This standard query does it:
-field:[* TO *]

On Tue, Jan 4, 2011 at 2:49 PM, Dennis Gearon <gearond@sbcglobal.net> wrote:
> Thanks Lance.
>
> I will be generating the COMB style of UUID external to Solr.
> Prevents a lot of index paging during INSERTS on DBs, maby eSolr too.
>
> So I would not use 'NEW' in the following, right?
> Just leave default out?
> Some sort of NOT NULL available in a Solr Schema?
>
> <field name="id" type="uuid" indexed="true" stored="true" default="NEW"/>
> PHP code to make the COMB style of UUID,
> easily adapted to other languages, some solutions already exist:
>
> <code>
> //requires php5_uuid module in PHP
> function make_comb_uuid(){
>      uuid_create(&$v4);
>      uuid_make($v4, UUID_MAKE_V4);
>      uuid_export($v4, UUID_FMT_STR, &$v4String);
>      $var=gettimeofday();
>      return
> substr($v4String,0,24).substr(dechex($var['sec'].$var['usec']),0,12);
>
> }
>
> </code>
>
> Dennis Gearon
>
>
>
>
> ----- Original Message ----
> From: Lance Norskog <goksron@gmail.com>
> To: solr-user@lucene.apache.org
> Sent: Tue, January 4, 2011 2:15:32 PM
> Subject: Re: uuid, COMB uuid, distributed farms
>
> http://wiki.apache.org/solr/UniqueKey
>
> On Mon, Jan 3, 2011 at 6:55 PM, pankaj bhatt <panbhatt@gmail.com> wrote:
>> HI Dennis,
>>      I have used UUID in context of an application where an installation id
>> (UUID) is generated by the code. It caters to around 10K users.
>>      I have not used it in context of SOLR.
>>
>> / Pankaj Bhatt.
>>
>> On Mon, Jan 3, 2011 at 11:05 PM, Dennis Gearon <gearond@sbcglobal.net>wrote:
>>
>>> Thank you Pankaj.
>>>
>>> How large was your installation of Solr? I'm hoping to get mine to be
>>> multinational and making plans for that as I go. So having unique ids,
>>> UUIDs,
>>> that cover a huge addressable space is a requirement.
>>>
>>> If your's was comparable, how were your replication issues, merging issues,
>>> anthing else related to getting large datasets searchable and unique?
>>>
>>>  Dennis Gearon
>>>
>>>
>>> Signature Warning
>>> ----------------
>>> It is always a good idea to learn from your own mistakes. It is usually a
>>> better
>>> idea to learn from others’ mistakes, so you do not have to make them
>>> yourself.
>>> from 'http://blogs.techrepublic.com.com/security/?p=4501&tag=nl.e036'
>>>
>>>
>>> EARTH has a Right To Life,
>>> otherwise we all die.
>>>
>>>
>>>
>>> ----- Original Message ----
>>> From: pankaj bhatt <panbhatt@gmail.com>
>>> To: solr-user@lucene.apache.org; gearond@sbcglobal.ne
>>> Sent: Mon, January 3, 2011 8:55:21 AM
>>> Subject: Re: uuid, COMB uuid, distributed farms
>>>
>>> Hi Dennis,
>>>
>>>        I have used UUID's in my project to identify a basic installation
of
>>> the client.
>>>        Can i be of any help.
>>>
>>> / Pankaj Bhatt.
>>>
>>> On Mon, Jan 3, 2011 at 3:28 AM, Dennis Gearon <gearond@sbcglobal.net>
>>> wrote:
>>>
>>> > Planning ahead here.
>>> >
>>> > Anyone have experience with UUIDs, COMB UUIDs (sequential) in large,
>>> > internatiionally distributed Solr/Database project.
>>> >
>>> >  Dennis Gearon
>>> >
>>> >
>>> > Signature Warning
>>> > ----------------
>>> > It is always a good idea to learn from your own mistakes. It is usually
a
>>> > better
>>> > idea to learn from others’ mistakes, so you do not have to make them
>>> > yourself.
>>> > from 'http://blogs.techrepublic.com.com/security/?p=4501&tag=nl.e036'
>>> >
>>> >
>>> > EARTH has a Right To Life,
>>> > otherwise we all die.
>>> >
>>> >
>>>
>>>
>>
>
>
>
> --
> Lance Norskog
> goksron@gmail.com
>
>



-- 
Lance Norskog
goksron@gmail.com

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