From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <9a5d188e7b220e2d8ce41bf79f8081b6@quanstro.net>
From: erik quanstrom <quanstro@quanstro.net>
Date: Mon, 13 Aug 2007 07:56:30 -0400
To: 9fans@cse.psu.edu
Subject: Re: [9fans] lsub.org
In-Reply-To: <599f06db0708122047p67c975a6y1f355eb0cdf767e5@mail.gmail.com>
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assuming things are broken without external help ....

i've been having trouble with dns infinitely extending
the life of queries when a "srvfail" is returned by an authoratitive
server.  eventually one query to a broken ns will hold up all the threads=
 available
on the server.  this happends a lot on reverse lookups.  i fire this scri=
pt
every 10 minutes to help ease the pain until i have the time figure out e=
xactly
what's going wrong.

- erik

#!/bin/rc
rfork en
mailuser=3Dguywhogetstocheckonthisstuff
fflag=3D0
nl=3D'
'
fn usage{
	echo 'usage: restartdns [-f]' >[1=3D2]
	exit usage
}

fn why{
	if(! ~ $#nbroken 0)
		echo getting medi=C3=A6val on $#nbroken broken dns processes.
	if not{
		echo getting medi=C3=A6val on $#nwait deadlocked dns processes.
		for(i in $nwait)
			echo $i
	}
}

for(i)switch($i){
case -f
	fflag=3D1
case *
	usage
}

if(~ $fflag 0){
	nbroken=3D`{ps -a | grep dns | grep Broken}
	ifs=3D$nl nwait=3D`{ps -a |sed -n 's/.* +dns \[query lock wait for(.*)\]=
/\1/gp' | sort | uniq -c | awk '$1>2'}

	if(~ $#nbroken 0 && ~ $#nwait 0)
		exit 'none broken'
	why
	if(~ $service rx)
		{date; echo; why; echo; ps -a | grep dns}| mail $guywhogetstocheckonthi=
sstuff
}

slay dns | rc
ndb/dns -s
ndb/dns -Rrsx /net.alt -f /lib/ndb/external