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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2575) Concurrent byte and int block implementations
Date Fri, 01 Oct 2010 10:45:35 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916853#action_12916853
] 

Michael McCandless commented on LUCENE-2575:
--------------------------------------------

bq. The posting-upto should stop the reader prior to reaching a byte element whose value is
0, ie, it should never happen.

OK but then we are making a full copy of postings upto (int per term) on every reopen?  Or
will we try to make this copy-on-write as well?

So now we need copy-on-write per-term int for tf and for posting upto?  Anything else?

I fear a copy-on-write check per-term is going to be a sizable perf hit.

> 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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