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https://issues.apache.org/jira/browse/LUCENE-2324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910276#action_12910276
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Michael McCandless commented on LUCENE-2324:
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bq. Is this because indexing stops while the DWPT segment is being flushed to
disk or are you referring to a different sync?
I'm talking about Lucene trunk today (ie before this patch).
Yes, because indexing of all 20 threads is blocked while a single thread moves
the RAM buffer to disk. But, with this patch, each thread will privately move
its own RAM buffer to disk, not blocking the rest.
With 20 threads I'm seeing ~4 seconds of concurrent indexing and then 6-8
seconds to flush (w/ 256 MB RAM buffer).
> 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.patch, lucene-2324.patch, LUCENE-2324.patch
>
>
> 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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