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From Dennis Gearon <gear...@sbcglobal.net>
Subject Re: uuid, COMB uuid, distributed farms
Date Tue, 04 Jan 2011 22:49:59 GMT
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


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