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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
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Jason Rutherglen commented on LUCENE-2575:
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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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