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https://issues.apache.org/jira/browse/SOLR-4006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494669#comment-13494669
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Mark Miller commented on SOLR-4006:
-----------------------------------
I don't think the spec matters much - I've got two versions in envs with
different Comps and different host hardware and different VM hardware.
I think the key is simply installing freebsd and turning on the hardcore black
hole mode, eg
{noformat}
# sysctl -w net.inet.tcp.blackhole=2
net.inet.tcp.blackhole: 0 -> 2
# sysctl -w net.inet.udp.blackhole=1
net.inet.udp.blackhole: 0 -> 1
# echo net.inet.tcp.blackhole=2 >> /etc/sysctl.conf
# echo net.inet.udp.blackhole=1 >> /etc/sysctl.conf
{noformat}
One of mine is all port snapped up to date, another is further back. Both are
FreeBSD 9.
Next just run one of the problem tests.
I use SolrCmdDistributorTest, because it's also what prompted the switch. This
test makes a bunch of connections very quickly. With the non NIO connector, it
sometimes takes 2 seconds, sometimes 2 minutes. With the NIO connector it's
always 2 seconds in my experience. However, on FreeBSD, you have the hangs
after the test is over...
> Many tests on Apache Jenkins are failing with lingering threads.
> ----------------------------------------------------------------
>
> Key: SOLR-4006
> URL: https://issues.apache.org/jira/browse/SOLR-4006
> Project: Solr
> Issue Type: Bug
> Reporter: Mark Miller
>
> I think I've tracked this down to being related to the black hole.
> It seems to be a recovery call to a server that is down or something - it's
> hanging in the connect method even though we are using a connect timeout.
> {noformat}
> Thread[RecoveryThread,5,TGRP-SyncSliceTest]
> java.net.PlainSocketImpl.socketConnect(Native Method)
> java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:327)
> java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:193)
> java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
> java.net.SocksSocketImpl.connect(SocksSocketImpl.java:384)
> java.net.Socket.connect(Socket.java:546)
> {noformat}
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