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Posted to dev@lucene.apache.org by "Uwe Schindler (JIRA)" <ji...@apache.org> on 2014/12/17 20:13:14 UTC
[jira] [Comment Edited] (LUCENE-5951) Detect when index is on SSD
and set dynamic defaults
[ https://issues.apache.org/jira/browse/LUCENE-5951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250333#comment-14250333 ]
Uwe Schindler edited comment on LUCENE-5951 at 12/17/14 7:12 PM:
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+1
The heavy funny heuristics method is a masterpiece of coding in contrast to Hadoop's detection. I am so happy that it does not exec "df" or "mount" commands! Many thanks :-) Java 7 is cool!
was (Author: thetaphi):
+1
The heavy funny heuristics method is a masterpiece of coding in contrast to Hadoop's detection. I am so happy that it does not span "df" or "mount" commands! Many thanks :-) Java 7 is cool!
> 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
>
>
> 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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