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https://issues.apache.org/jira/browse/LUCENE-3416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099146#comment-13099146
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Shay Banon commented on LUCENE-3416:
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The only reason its synchronized is because the setMaxMergeWriteMBPerSec method
is synchronized (I guess to protected from setting the rate limit
concurrently). In practice, I don't see users changing it that often, so
concerns about cache lines are not really relevant.
> Allow to pass an instance of RateLimiter to FSDirectory allowing to rate
> limit merge IO across several directories / instances
> ------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3416
> URL: https://issues.apache.org/jira/browse/LUCENE-3416
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/store
> Reporter: Shay Banon
> Assignee: Simon Willnauer
> Attachments: LUCENE-3416.patch
>
>
> This can come in handy when running several Lucene indices in the same VM,
> and wishing to rate limit merge across all of them.
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