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https://issues.apache.org/jira/browse/LUCENE-3515?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-3515:
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Attachment: LUCENE-3515.patch
Patch, fixing the lack of reuse in MultiTermsEnum (used during merging).
The lack of re-use meant we were cloning 2 IndexInputs (frq/prx) per term being
merged! For NIOFSDir this then meant we would read the same 4K region of the
file over and over and over again.
I added a test to catch "over-cloning", but, the test sometimes fails when it
gets pulsing codec because that codec does not properly reuse (a known issue
that we should now fix!).
> Possible slowdown of indexing/merging on 3.x vs trunk
> -----------------------------------------------------
>
> Key: LUCENE-3515
> URL: https://issues.apache.org/jira/browse/LUCENE-3515
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Reporter: Michael McCandless
> Fix For: 3.5, 4.0
>
> Attachments: LUCENE-3515.patch, LUCENE-index-34.patch,
> LUCENE-index-40.patch, TestGenerationTime.java.3x,
> TestGenerationTime.java.40, stdout-snow-leopard.tar.gz
>
>
> Opening an issue to pursue the possible slowdown Marc Sturlese uncovered.
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