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From "Renaud Delbru (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2340) FixedIntBlockIndexOutput encodes unnecessary integers at the end of a list
Date Mon, 22 Mar 2010 18:37:27 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2340?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Renaud Delbru updated LUCENE-2340:
----------------------------------

    Attachment: LUCENE-1458-FixedIntBlockIndexOutput.patch

Fixed SimpleIntBlockIndex* and added unit test. The new implementation of SimpleIntBlockIndex*
is even more silly than the previous one, and store a vint at the beginning of each block
for recording the length of a block.

> FixedIntBlockIndexOutput encodes unnecessary integers at the end of a list
> --------------------------------------------------------------------------
>
>                 Key: LUCENE-2340
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2340
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: Flex Branch
>            Reporter: Renaud Delbru
>            Priority: Minor
>             Fix For: Flex Branch
>
>         Attachments: LUCENE-1458-FixedIntBlockIndexOutput.patch, LUCENE-1458-FixedIntBlockIndexOutput.patch
>
>
> At closing time, the current FixedIntBlockIndexOutput flushes blocks of blockSize even
if there is only a few integers in the block.
> This can be problematic and causes a big overhead when using large blockSize (e.g., 1024),
on small segments or on rare term posting list. 
> One solution will be to have a secondary flushBlock method with an additional paramter:
the valid length of a buffer. This method will be only called in the FixedIntBlockIndexOutput#close()
method.
> The way this particular block of integers are encoded are left to subclasses.

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