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https://issues.apache.org/jira/browse/LUCENE-2324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988090#action_12988090
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Jason Rutherglen commented on LUCENE-2324:
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bq. Even if we do full stop for commit and getReader, we've still gained
concurrency on the batch indexing case.
Right, I'm still worried this case has update doc concurrency issues.
{quote}The current plan w/ deletes is that a delete gets buffered 1) into the
global pool (stored in DW and pushed whenever any DWPT flushes), as well as 2)
per DWPT. The per-DWPT pools apply only to the segment flushed from that DWPT,
while the global pool applies during coalescing (ie to all "prior"
segments).{quote}
Ok, this is very clear now.
bq. We also must then ensure that no "post commit point" DWPT is allowed to
flush until all "pre commit point" DWPTs have been visited by the sweeper.
Ah, this's the key that should solve the edge cases.
> 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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