[hibernate-dev] RE: Dynamically changing mergeFactor and maxMergeDocs

[John Griffin]

Hardy,

I have two applications. One builds the indexes with its own set of
constants and the other is the normal application that
adds/updates/deletes/searches with a different set of constants. I have seen
NO adverse effects on the indexes with this setup. I don't see where there
would be any difference if the same application did all operations and
changed the values as needed.

John Griffin



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Today's Topics:

   1. Dynamically changing mergeFactor and maxMergeDocs
      (HSEARCH-67) (hibernate at ferentschik.de)
   2. hibernate-db2-8.2-testsuite Build Completed With	Testsuite
      Errors (jboss-qa-internal at redhat.com)
   3. hibernate-sqlserver-msjdbc-testsuite Build	Completed With
      Testsuite Errors (jboss-qa-internal at redhat.com)


----------------------------------------------------------------------

Message: 1
Date: Wed, 04 Jul 2007 20:24:24 +0200
From: hibernate at ferentschik.de
Subject: [hibernate-dev] Dynamically changing mergeFactor and
	maxMergeDocs	(HSEARCH-67)
To: <hibernate-dev at lists.jboss.org>
Message-ID:
	<20597004.1110301183573464459.JavaMail.servlet at kundenserver>
Content-Type: text/plain; charset=UTF-8

Hi there,

I started implementing a solution for HSEARCH-67
(http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-67) which
allows to have to sets of configuration parameters for mergeFactor and
maxMergeDocs.

The idea is that at initial index creation time (via
FullTextSession.index()) you want to have a high mergeFactor and
maxMergeDocs in order to speed up indexing. However, once the initial index
is created you want to have max performance for searches in which case lower
values for the above settings are more appropriate. 

The current solution allows now to change the performace tuning settings
depending on the use case. However, is this a valid apporach? The Lucene API
seems to allow to dynamically change these values, but I never have used it
this way. Normally I used mergeFactor and maxMergeFactor as once off
configuration options. Does anyone have any experience with dynamically
changing these Lucene performance parameters? Does chaging of these
parameters any impact on the index structure, search performance, ... ?

Cheers,
Hardy


------------------------------

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Date: Thu, 5 Jul 2007 03:25:37 -0400 (EDT)
From: jboss-qa-internal at redhat.com
Subject: [hibernate-dev] hibernate-db2-8.2-testsuite Build Completed
	With	Testsuite Errors
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Date: Thu, 5 Jul 2007 03:38:58 -0400 (EDT)
From: jboss-qa-internal at redhat.com
Subject: [hibernate-dev] hibernate-sqlserver-msjdbc-testsuite Build
	Completed With Testsuite Errors
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