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From "John Wang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1574) PooledSegmentReader, pools SegmentReader underlying byte arrays
Date Sat, 01 Aug 2009 20:38:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737950#action_12737950
] 

John Wang commented on LUCENE-1574:
-----------------------------------

Re: Zoie and deleted docs:
That is no longer true, Zoie is using a bloom filter over a intHash set from fastutil for
exactly the perf reason Jason pointed.

> PooledSegmentReader, pools SegmentReader underlying byte arrays
> ---------------------------------------------------------------
>
>                 Key: LUCENE-1574
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1574
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/*
>    Affects Versions: 2.4.1
>            Reporter: Jason Rutherglen
>            Priority: Minor
>             Fix For: 3.1
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> PooledSegmentReader pools the underlying byte arrays of deleted docs and norms for realtime
search.  It is designed for use with IndexReader.clone which can create many copies of byte
arrays, which are of the same length for a given segment.  When pooled they can be reused
which could save on memory.  
> Do we want to benchmark the memory usage comparison of PooledSegmentReader vs GC?  Many
times GC is enough for these smaller objects.

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