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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4283) Support more frequent skip with Block Postings Format
Date Sun, 05 Aug 2012 22:42:02 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428926#comment-13428926
] 

Michael McCandless commented on LUCENE-4283:
--------------------------------------------

Thanks Billy, I tweaked the cleanup patch some (removed blockInts, restored lost DEBUGs, added
some nocommits, etc.) and committed.
                
> Support more frequent skip with Block Postings Format
> -----------------------------------------------------
>
>                 Key: LUCENE-4283
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4283
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Han Jiang
>            Priority: Minor
>         Attachments: LUCENE-4283-buggy.patch, LUCENE-4283-buggy.patch, LUCENE-4283-codes-cleanup.patch,
LUCENE-4283-slow.patch, LUCENE-4283-small-interval-fully.patch, LUCENE-4283-small-interval-partially.patch
>
>
> This change works on the new bulk branch.
> Currently, our BlockPostingsFormat only supports skipInterval==blockSize. Every time
the skipper reaches the last level 0 skip point, we'll have to decode a whole block to read
doc/freq data. Also,  a higher level skip list will be created only for those df>blockSize^k,
which means for most terms, skipping will just be a linear scan. If we increase current blockSize
for better bulk i/o performance, current skip setting will be a bottleneck. 
> For ForPF, the encoded block can be easily splitted if we set skipInterval=32*k. 

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