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#!/usr/bonsaitools/bin/perl -w
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# The Initial Developer of the Original Code is Netscape Communications
# Corporation. Portions created by Netscape are
# Copyright (C) 2000 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s): Dan Mosedale <dmose@mozilla.org>
#
# mysqld-watcher.pl - a script that watches the running instance of
# mysqld and kills off any long-running SELECTs against the shadow_db
#
use diagnostics;
use strict;
require "globals.pl";
# some configurables:
# length of time before a thread is eligible to be killed, in seconds
#
my $long_query_time = 600;
#
# the From header for any messages sent out
#
my $mail_from = "root\@lounge.mozilla.org";
#
# mail transfer agent. this should probably really be converted to a Param().
#
my $mta_program = "/usr/lib/sendmail -t -ODeliveryMode=deferred";
# and STDIN is where we get the info about running threads
#
close(STDIN);
open(STDIN, "/usr/bonsaitools/bin/mysqladmin processlist |");
# iterate through the running threads
#
my @LONGEST = (0,0,0,0,0,0,0,0,0);
while ( <STDIN> ) {
my @F = split(/\|/);
# if this line is not the correct number of fields, or if the thread-id
# field contains Id, skip this line. both these cases indicate that this
# line contains pretty-printing gunk and not thread info.
#
next if ( $#F != 9 || $F[1] =~ /Id/);
if ( $F[4] =~ /shadow_bugs/ # shadowbugs database in use
&& $F[5] =~ /Query/ # this is actually a query
&& $F[6] > $long_query_time # this query has taken too long
&& $F[8] =~ /(select|SELECT)/ # only kill a select
&& $F[6] > $LONGEST[6] ) { # the longest running query seen
@LONGEST = @F;
}
}
# send an email message
#
# should perhaps be moved to somewhere more global for use in bugzilla as a
# whole; should also do more error-checking
#
sub sendEmail($$$$) {
($#_ == 3) || die("sendEmail: invalid number of arguments");
my ($from, $to, $subject, $body) = @_;
open(MTA, "|$mta_program");
print MTA "From: $from\n";
print MTA "To: $to\n";
print MTA "Subject: $subject\n";
print MTA "\n";
print MTA $body;
print MTA "\n";
close(MTA);
}
# if we found anything, kill the database thread and send mail about it
#
if ($LONGEST[6] != 0) {
system ("/usr/bonsaitools/bin/mysqladmin", "kill", $LONGEST[1]);
# fire off an email telling the maintainer that we had to kill a thread
#
sendEmail($mail_from, Param("maintainer"),
"long running MySQL thread killed",
join(" ", @LONGEST) . "\n");
}
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