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https://issues.apache.org/jira/browse/LUCENE-2573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014046#comment-13014046
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Michael Busch commented on LUCENE-2573:
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Thanks, Simon, for running the benchmarks! Good results overall, even though
it's puzzling why flushing would be CPU intensive.
We should probably do some profiling to figure out where the time is spent. I
can probably do that Sunday, but feel free to beat me :)
> Tiered flushing of DWPTs by RAM with low/high water marks
> ---------------------------------------------------------
>
> Key: LUCENE-2573
> URL: https://issues.apache.org/jira/browse/LUCENE-2573
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael Busch
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: Realtime Branch
>
> Attachments: LUCENE-2573.patch, LUCENE-2573.patch, LUCENE-2573.patch,
> LUCENE-2573.patch, LUCENE-2573.patch, LUCENE-2573.patch, LUCENE-2573.patch,
> LUCENE-2573.patch, LUCENE-2573.patch
>
>
> Now that we have DocumentsWriterPerThreads we need to track total consumed
> RAM across all DWPTs.
> A flushing strategy idea that was discussed in LUCENE-2324 was to use a
> tiered approach:
> - Flush the first DWPT at a low water mark (e.g. at 90% of allowed RAM)
> - Flush all DWPTs at a high water mark (e.g. at 110%)
> - Use linear steps in between high and low watermark: E.g. when 5 DWPTs are
> used, flush at 90%, 95%, 100%, 105% and 110%.
> Should we allow the user to configure the low and high water mark values
> explicitly using total values (e.g. low water mark at 120MB, high water mark
> at 140MB)? Or shall we keep for simplicity the single setRAMBufferSizeMB()
> config method and use something like 90% and 110% for the water marks?
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