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https://issues.apache.org/jira/browse/SOLR-16644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17773842#comment-17773842
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ASF subversion and git services commented on SOLR-16644:
--------------------------------------------------------

Commit 69ab812a7fbe2c9bd6545048c56a1b39fb46b078 in solr's branch 
refs/heads/branch_9x from Jan Høydahl
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=69ab812a7fb ]

SOLR-16644: Only warn entropy on Linux (#2000)

(cherry picked from commit 4e9b330d9e7adb8eb866df8e148be21651eb6255)


> Entropy warning thresholds need to be revisited
> -----------------------------------------------
>
>                 Key: SOLR-16644
>                 URL: https://issues.apache.org/jira/browse/SOLR-16644
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Ishan Chattopadhyaya
>            Priority: Major
>              Labels: newdev
>             Fix For: 9.4
>
>          Time Spent: 2h 20m
>  Remaining Estimate: 0h
>
> As per the following, newer kernels (5.15+) have recalibrated the entropy 
> levels from 0-4096 to 0-256. Hence, everything is throwing a warning:
> {code}
> Warning: Available entropy is low. As a result, use of the UUIDField, SSL, or 
> any other features that require
> RNG might not work properly. To check for the amount of available entropy, 
> use 'cat /proc/sys/kernel/random/entropy_avail'.
> {code}
> Here's where I found out about this change:
> https://askubuntu.com/questions/1427470/entropy-is-stuck-at-256-after-upgrading-to-kernel-5-15-0-47
> We might need to intelligently report the low entropy (based on kernel 
> version).



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