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https://issues.apache.org/jira/browse/LUCENE-2324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12979190#action_12979190
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Michael McCandless commented on LUCENE-2324:
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{quote}
And there's the case of the thread calling flush doesn't yet have a DWPT, it's
going to need to get one assigned to it, however the one assigned may not be
the max ram consumer. What'll we do then? If the user explicitly called flush
we can a) do nothing b) flush (the max ram consumer) thread's DWPT, however
that gets hairy with wait notifies (almost like the global lock?).
{quote}
Wait -- why would the thread calling flush need to have a DWPT assigned to it?
You're talking about the "flush the world" case? (Ie the app calls IW.commit
or IW.getReader). In this case the thread just one by one pulls all DWPTs that
have any indexed docs out of production, flushes them, clears them, and returns
them to production?
> Per thread DocumentsWriters that write their own private segments
> -----------------------------------------------------------------
>
> Key: LUCENE-2324
> URL: https://issues.apache.org/jira/browse/LUCENE-2324
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael Busch
> Assignee: Michael Busch
> Priority: Minor
> Fix For: Realtime Branch
>
> Attachments: LUCENE-2324-SMALL.patch, LUCENE-2324-SMALL.patch,
> LUCENE-2324-SMALL.patch, LUCENE-2324-SMALL.patch, LUCENE-2324-SMALL.patch,
> lucene-2324.patch, lucene-2324.patch, LUCENE-2324.patch, test.out, test.out
>
>
> See LUCENE-2293 for motivation and more details.
> I'm copying here Mike's summary he posted on 2293:
> Change the approach for how we buffer in RAM to a more isolated
> approach, whereby IW has N fully independent RAM segments
> in-process and when a doc needs to be indexed it's added to one of
> them. Each segment would also write its own doc stores and
> "normal" segment merging (not the inefficient merge we now do on
> flush) would merge them. This should be a good simplification in
> the chain (eg maybe we can remove the *PerThread classes). The
> segments can flush independently, letting us make much better
> concurrent use of IO & CPU.
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