[jira] Commented: (LUCENE-2575) Concurrent byte and int block implementations

["Jason Rutherglen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-2575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907069#action_12907069 ] 

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

bq. every term has its own open IndexOutput

I'm not seeing IndexOutput in use with the RAM buffer, do you
mean the the write* (writeVInt, writeBytes, writeByte) methods
of TermsHashPerField? 

Included in this patch will need to be a way to concurrently
grow other arrays such as ParallelPostingsArray. PPA is used to
store pointers to data stored in the block pools. Maybe we need
a class that concurrently manages growing arrays and block
pools. 

Or we may need to slightly re-architect how we're storing the
RAM buffer data so that concurrency can be guaranteed, ie, I
think we'll need to write to temporary arrays, which are then
flushed to primary readable arrays. The flush would occur after
adding a document, or probably for better efficiency, only when
getReader is called.

> 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
>
>
> 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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