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https://issues.apache.org/jira/browse/LUCENE-2573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-2573:
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Attachment: LUCENE-2573.patch
next iteration on this patch. I changed some naming issues and separated a
ByRAMFlushPolicy as an abstract base class. This patch contains the original
MultiTierFlushPolicy and a SingleTierFlushPolicy that only has a low and a high
watermark. This policy tries to flush the biggest DWPT once LW is crossed and
flushed all DWPT once HW is crossed.
This patch also adds a "flush if stalled" control that hijacks indexing threads
if the DW is stalled and there are still pending flushes. If so the incoming
thread tries to check out a pending DWPT and flushes it before it adds the
actual document.
I didn't benchmark the more complex MultiTierFP vs. SingleTierFP yet. I hope I
get to this soon.
> 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
>
>
> 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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