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https://issues.apache.org/jira/browse/LUCENE-2324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999247#comment-12999247
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Michael Busch commented on LUCENE-2324:
---------------------------------------
{quote}
Can anyone gimme a quick statement about what is left here or what the status
of this issue is? I am at the point where I need to do some rather big changes
to DocValues which I would not need if we have DWPT so I might rather help here
before wasting time.
{quote}
I think it's very close! The new deletes approach is implemented, and various
bugs are fixed. Also the latest trunk is merged in (including LUCENE-2881).
Outstanding issues are to fix the updateDocument() problems, and finish
flush-by-RAM (LUCENE-2573).
Other than TestStressIndexing2 and TestNRTThreads (updateDocument problem) and
a few tests that rely on flush-by-RAM, all core and contrib tests are passing
now.
> 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, LUCENE-2324.patch,
> lucene-2324.patch, lucene-2324.patch, test.out, test.out, 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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