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Date: Wed, 15 Sep 2010 11:30:33 -0400 (EDT)
From: "Jason Rutherglen (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-2575) Concurrent byte and int block
 implementations
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    [ https://issues.apache.org/jira/browse/LUCENE-2575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909771#action_12909771 ] 

Jason Rutherglen commented on LUCENE-2575:
------------------------------------------

Because of the way byte slices work, eg, they need to pre-know
the size of the slice before iterating on it, we can't simply
point to the middle of a slice and read without probably
iterating over the forwarding address.

It seems the skip list will need to point to the beginning of a
slice. This'll make the interval iteration in the RAM buffer
skip list writer a little more complicated than today in that
it'll need to store positions that are the start of byte slices.
In other words, the intervals will be slightly uneven at times.

> Concurrent byte and int block implementations
> ---------------------------------------------
>
>                 Key: LUCENE-2575
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2575
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: Realtime Branch
>            Reporter: Jason Rutherglen
>             Fix For: Realtime Branch
>
>         Attachments: LUCENE-2575.patch, LUCENE-2575.patch, LUCENE-2575.patch, LUCENE-2575.patch
>
>
> The current *BlockPool implementations aren't quite concurrent.
> We really need something that has a locking flush method, where
> flush is called at the end of adding a document. Once flushed,
> the newly written data would be available to all other reading
> threads (ie, postings etc). I'm not sure I understand the slices
> concept, it seems like it'd be easier to implement a seekable
> random access file like API. One'd seek to a given position,
> then read or write from there. The underlying management of byte
> arrays could then be hidden?

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