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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