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https://issues.apache.org/jira/browse/SOLR-5776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14080010#comment-14080010
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Steve Rowe commented on SOLR-5776:
----------------------------------
bq. Steve Rowe: I have no idea what the cron-job is doing! Can somebody
explain and why this helps?
The cron job is feeding the entropy pool by writing to {{/dev/random}}, which
should unblock reads from {{/dev/random}}, assuming there is some randomness in
what gets fed in, and/or that side-effect I/O timings feed the pool.
I don't much about this stuff, but here's some things I've read recently about
it:
* https://we.riseup.net/debian/entropy (Linux random entropy, some Debian
specifics, with a discussion of other OSs)
*
http://security.stackexchange.com/questions/42952/how-can-i-measure-and-increase-entropy-on-mac-os-x
(Q/A about OS X entropy)
* http://en.wikipedia.org/wiki/Entropy_(computing) (Brief coverage of various
OSs' handling of entropy)
* http://en.wikipedia.org/?title=/dev/random (random number generation on
various OSs)
* https://wiki.freebsd.org/201308DevSummit/Security/DevRandom (FreeBSD
/dev/random design discussion)
bq. Is there anything to change in Windows or the Linux Jenkins?
I don't know; as Hoss says above, we want to run some experiments to see if
re-enabling SSL in tests that have had trouble in the past will cause trouble
again. So we should know in short order if these need changes.
{quote}
You can log into MacOSX jenkins (if its running): ssh
[email protected] (has IPv4 and IPv6 address), for the password
send me a note. You can try out whatever you want. Please note, that the
virtual machine gets reset to "clean and empty state" on every update, so once
you found a good cron-job, I can persist it on the VM snapshot.
{quote}
Done - I only did two things: {{sudo touch /etc/crontab}} to enable cron
(apparently on OSX cron doesn't do anything unless this file exists, and it
doesn't exist until you create it); and added a crontab for the jenkins user
via {{crontab -e}} - here's the result (via {{crontab -l}}):
{noformat}
# Stolen from FreeBSD's /etc/rc.d/initrandom to unblock /dev/random
* * * * * ( ps -faxww ; /usr/sbin/sysctl -a ; date ; df -ib ; ps -faxww ; cat
/bin/ls ) | dd of=/dev/random bs=8k 2>/dev/null
{noformat}
I re-enabled SSL on {{TestCloudSchemaless}}, and I'll monitor Jenkins to see if
it starts failing.
> Look at speeding up using SSL with tests.
> -----------------------------------------
>
> Key: SOLR-5776
> URL: https://issues.apache.org/jira/browse/SOLR-5776
> Project: Solr
> Issue Type: Test
> Reporter: Mark Miller
> Assignee: Mark Miller
> Fix For: 4.9, 5.0
>
> Attachments: SOLR-5776.patch, SOLR-5776.patch
>
>
> We have to disable SSL on a bunch of tests now because it appears to sometime
> be ridiculously slow - especially in slow envs (I never see timeouts on my
> machine).
> I was talking to Robert about this, and he mentioned that there might be some
> settings we could change to speed it up.
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