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From Eric Charles <eric.char...@u-mangate.com>
Subject Re: Hash indexing of HFiles
Date Sat, 16 Jul 2011 08:38:37 GMT
On 15/07/11 16:48, Michael Segel wrote:
> Claudio,
> I'm not sure on how to answer this...
> Yes, we've got a prototype of a Lucene on HBase w Spatial that we're starting to test.

That's Cool Michael.
Is there a chance to read more on your prototype ?  ;)

> With respect to hashing...
> In one project we just hashed the key using the SHA-1 hash already in Java. This gave
us the randomness without having to try to build a separate index.
> But we're still using the base key for the row. Its not like we're creating a secondary
index on a column value.
> There are a couple of other projects out there on Git Hub so you may want to check them
> -Mike
>> Date: Fri, 15 Jul 2011 14:32:50 +0200
>> From: claudio.martella@tis.bz.it
>> To: user@hbase.apache.org
>> Subject: Hash indexing of HFiles
>> Hello list,
>> at SIGMOD this year i've seen a spreading of different storage files for
>> HBase, with different techniques. My scenario and usage doesn't really
>> require range queries, so I thought I'd take advantage of even faster
>> random i/o from hash indexing of data in each sequence file.
>> Does anybody know if anybody has developed other indexing techniques for
>> sequence files other than Btrees?
>> Thanks!
>> --
>> Claudio Martella
>> Free Software&  Open Technologies
>> Analyst
>> TIS innovation park
>> Via Siemens 19 | Siemensstr. 19
>> 39100 Bolzano | 39100 Bozen
>> Tel. +39 0471 068 123
>> Fax  +39 0471 068 129
>> claudio.martella@tis.bz.it http://www.tis.bz.it
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Eric Charles

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