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https://issues.apache.org/jira/browse/SOLR-10352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15945718#comment-15945718
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Ishan Chattopadhyaya commented on SOLR-10352:
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[~hossman], I think it is a good point that entropy could, in theory, go up and
down over the course of the life of a Solr process. In practice, a host with
high entropy (say baremetal) continues to remain in high entropy available
state; and low entropy hosts (say VMs) continue to remain in a low entropy
mode. So, although in theory a system could get in and out of the diminished
available entropy state, in practice, afaik, a good system remains good and a
bad one remains bad. Hence, a startup warning feels like a sensible thing to
throw out there.
bq. Rather then warning about this in bin/solr I feel like this type of
information should be exposed by the solr metrics code, so people can easily
monitor it over the life of the solr server process
I feel that a start up warning should definitely be thrown, since we already
know that there will be a problem. Having metrics support and UI warning is a
great idea. However, I think we should do both (startup warning and metrics/UI
warning).
> Low entropy warning in bin/solr script
> --------------------------------------
>
> Key: SOLR-10352
> URL: https://issues.apache.org/jira/browse/SOLR-10352
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Ishan Chattopadhyaya
> Fix For: master (7.0), branch_6x
>
> Attachments: SOLR-10352.patch
>
>
> We should add a warning in the startup script for Linux, if the output of the
> following is below a certain threshold (maybe 300?). The warning could
> indicate that features like UUIDField, SSL etc. might not work properly (or
> be slow). As a hint, we could then suggest the user to configure a non
> blocking SecureRandom (SOLR-10338) or install rng-tools, haveged etc.
> {quote}
> cat /proc/sys/kernel/random/entropy_avail
> {quote}
> Original discussion:
> https://issues.apache.org/jira/browse/SOLR-10338?focusedCommentId=15938904&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15938904
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