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https://issues.apache.org/jira/browse/LUCENE-5951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14253144#comment-14253144
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Uwe Schindler commented on LUCENE-5951:
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Hi Mike,
I am OK with that. I would only add one other addition: "For all other
operating systems it currently assumes a rotational disk for backwards
compatibility."
Another idea: we should maybe add special convenience setter to set optimal
settings. By that, you don't rely on the auto detection and still can set
"automatic" settings for both types of drives:
- {{setMaxMergesAndThreads(int maxMergeCount, int maxThreadCount)}} (expert)
- {{setDefaultMergesAndThreads(boolean optimizeForNonRotational)}} (convenience)
Uwe
> Detect when index is on SSD and set dynamic defaults
> ----------------------------------------------------
>
> Key: LUCENE-5951
> URL: https://issues.apache.org/jira/browse/LUCENE-5951
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Attachments: LUCENE-5951.patch, LUCENE-5951.patch, LUCENE-5951.patch,
> LUCENE-5951.patch, LUCENE-5951.patch, LUCENE-5951.patch
>
>
> E.g. ConcurrentMergeScheduler should default maxMergeThreads to 3 if it's on
> SSD and 1 if it's on spinning disks.
> I think the new NIO2 APIs can let us figure out which device we are mounted
> on, and from there maybe we can do os-specific stuff e.g. look at
> /sys/block/dev/queue/rotational to see if it's spinning storage or not ...
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