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https://issues.apache.org/jira/browse/LUCENE-6119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-6119:
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Attachment: LUCENE-6119.patch
OK new patch with a completely different approach, moving the
tracking under Directory.
I added a new AdaptiveRateLimitedDirectoryWrapper: it watches the
average bytes/sec written by non-merges, and then (based on a
multiplier) sets the merge throttling accordingly. It uses a rolling
timestamps window of the last 1 GB of writes with 1 MB resolution, and
lets you set min/max on the merge throttle.
Also, I removed RateLimitedDirectoryWrapper: I think it's dangerous
how it encourages you to throttle anything except merges, and
encourages you to just set a fixed rate (one size does NOT fit
all...). If you want "similar" behavior you can use
AdaptiveRateLimitedDirectoryWrapper but set min and max to the same
value.
> Add IndexWriter.getTotalNewBytesWritten
> ---------------------------------------
>
> Key: LUCENE-6119
> URL: https://issues.apache.org/jira/browse/LUCENE-6119
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 5.0, Trunk
>
> Attachments: LUCENE-6119.patch, LUCENE-6119.patch
>
>
> This method returns number of "incoming" bytes IW has written since it
> was opened, excluding merging.
> It tracks flushed segments, new commits (segments_N), incoming
> files/segments by addIndexes, newly written live docs / doc values
> updates files.
> It's an easy statistic for IW to track and should be useful to help
> applications more intelligently set defaults for IO throttling
> (RateLimiter).
> For example, an application that does hardly any indexing but finally
> triggered a large merge can afford to heavily throttle that large
> merge so it won't interfere with ongoing searches.
> But an application that's causing IW to write new bytes at 50 MB/sec
> must set a correspondingly higher IO throttling otherwise merges will
> clearly fall behind.
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