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https://issues.apache.org/jira/browse/LUCENE-2324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858948#action_12858948
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Jason Rutherglen commented on LUCENE-2324:
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I get Michael B's motivation however Mike M's global ram limit
is probably better from a user perspective and it would be a
sync only on a long RAM used variable, so we should be good?
Sounds like we use the current thread affinity system (ie, a
hash map), that when the max threads is reached, new threads get
kind of round robined onto existing DWPTs?
{quote}if RAM usage grows too much beyond your first trigger and
before that first flush has finished, start a 2nd DWPT flushing,
etc. {quote}
What's the definition of the "too much" portion of the above
statement?
> 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: 3.1
>
> Attachments: 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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