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From Rafał Kuć <r....@solr.pl>
Subject Re: understanding the need to reindex a document
Date Mon, 22 Oct 2012 19:56:00 GMT
Hello!

This is because how the Lucene inverted index works and the amount of
changes that would have to be done. However there is a work in
progress issue - https://issues.apache.org/jira/browse/LUCENE-3837
There is some technical information there, so you may want to check
it.

-- 
Regards,
 Rafał Kuć
 Sematext :: http://sematext.com/ :: Solr - Lucene - Nutch

> I can understand that (i.e. why in place wont work), but the Q would be,
> why one can't read in a document, add() or removeField() that document
> and then updateDocument() that document.

> On 10/22/2012 03:43 PM, Apostolis Xekoukoulotakis wrote:
>> I am not that familiar with Lucene, so my answer may be a bit off.
>>
>> Search on the internet about log structured storage. There you will find
>> why rewriting an entry is better than updating an existing entry.
>>
>> Leveldb/cassandra/bigTable use it. maybe search these terms as well.
>>
>> 2012/10/22 Shaya Potter <spotter@gmail.com>
>>
>>> so there are lots of Qs that are asked about wanting to modify a lucene
>>> document (i.e. remove fields, add fields....) but are told that one needs
>>> to reindex.
>>>
>>> No one ever answers the technical Q of why this is, and I'm interested in
>>> that.  presumambly because documents aren't stored as documents or even in
>>> any form that could be reassembled into a document, but I'm interested in
>>> what the actual answer is.
>>>
>>> thanks.
>>>
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>>
>>

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