[jira] [Commented] (SOLR-2725) TieredMergePolicy and expungeDeletes behaviour

["Otis Gospodnetic (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-2725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702817#comment-13702817 ] 

Otis Gospodnetic commented on SOLR-2725:
----------------------------------------

The above URL to the IRC conversation around this doesn't work any more.

This seems almost like an oversight, no?  Or is there a reason why Solr doesn't expose this?
                
> TieredMergePolicy and expungeDeletes behaviour
> ----------------------------------------------
>
>                 Key: SOLR-2725
>                 URL: https://issues.apache.org/jira/browse/SOLR-2725
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 3.3, 3.4, 3.5, 3.6
>            Reporter: Martijn van Groningen
>
> During executing a commit with expungeDeletes I noticed there were still a lot of segments left.
> However there were still ~30 segments left with deletes after the commit finished.
> After looking in SolrIndexConfig class I noticed that TieredMergePolicy#setExpungeDeletesPctAllowed isn't invoked.
> I think the following statements in SolrIndexConfig#buildMergePolicy method will purge all deletes:
> {code}
> tieredMergePolicy.setExpungeDeletesPctAllowed(0);
> {code} 
> This also reflects the behavior of Solr 3.1 / 3.2
> After some discussion on IRC setting expungeDeletesPctAllowed always to zero isn't best for performance:
> http://colabti.org/irclogger/irclogger_log/lucene-dev?date=2011-08-20#l120
> I think we should add an option to solrconfig.xml that allows users to set this option to whatever value is best for them:
> {code:xml}
> <expungeDeletesPctAllowed>0</expungeDeletesPctAllowed>
> {code}
> Also having a expungeDeletesPctAllowed per commit command would be great:
> {code:xml}
> <commit waitFlush="false" waitSearcher="false" expungeDeletes="true" expungeDeletesPctAllowed="0"/>
> {code}

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