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https://issues.apache.org/jira/browse/LUCENE-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12974901#action_12974901
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Paul Elschot commented on LUCENE-1410:
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bq. .. we might be able to have some gains by allowing a directory to return an
IntBufferIndexInput of some sort (separate from DataInput/IndexInput) that
basically just positions an IntBuffer view (the default implementation would
fill from an indexinput into a bytebuffer like we do now),
Since things are moving on the nio buffer front (see also LUCENE-2292), how
about trying to be independent from the buffer implementation?
That might be done by allowing an IntBuffer wrapping a byte array or as view
alongside a ByteBuffer, or temporary IntBuffer as above.
To be independent from the buffer implementation we could add some methods to
IndexInput:
void startAlignToInt() // basically a seek to the next multiple of 4 byte when
not already there. Could also start using an IntBuffer somehow.
int readAlignedInt() // get the next int, default to readInt(), use an
IntBuffer when available.
void endAlignToInt() // switch back to byte reading, set the byte buffer to the
the position corresponding to the int buffer.
(Adding this to DataInput seems to be a more natural place, but DataInput
cannot seek.)
Would that work, and could it work fast?
> PFOR implementation
> -------------------
>
> Key: LUCENE-1410
> URL: https://issues.apache.org/jira/browse/LUCENE-1410
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Reporter: Paul Elschot
> Priority: Minor
> Fix For: Bulk Postings branch
>
> Attachments: autogen.tgz, for-summary.txt,
> LUCENE-1410-codecs.tar.bz2, LUCENE-1410.patch, LUCENE-1410.patch,
> LUCENE-1410.patch, LUCENE-1410.patch, LUCENE-1410b.patch, LUCENE-1410c.patch,
> LUCENE-1410d.patch, LUCENE-1410e.patch, TermQueryTests.tgz, TestPFor2.java,
> TestPFor2.java, TestPFor2.java
>
> Original Estimate: 21840h
> Remaining Estimate: 21840h
>
> Implementation of Patched Frame of Reference.
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