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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1579) Cloned SegmentReaders fail to share FieldCache entries
Date Sat, 28 Mar 2009 16:04:50 GMT
Cloned SegmentReaders fail to share FieldCache entries
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                 Key: LUCENE-1579
                 URL: https://issues.apache.org/jira/browse/LUCENE-1579
             Project: Lucene - Java
          Issue Type: Bug
          Components: Index
    Affects Versions: 2.9
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 2.9


I just hit this on LUCENE-1516, which returns a cloned readOnly
readers from IndexWriter.

The problem is, when cloning, we create a new [thin] cloned
SegmentReader for each segment.  FieldCache keys directly off this
object, so if you clone the reader and do a search that requires the
FieldCache (eg, sorting) then that first search is always very slow
because every single segment is reloading the FieldCache.

This is of course a complete showstopper for LUCENE-1516.

With LUCENE-831 we'll switch to a new FieldCache API; we should ensure
this bug is not present there.  We should also fix the bug in the
current FieldCache API since for 2.9, users may hit this.


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