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| -rwxr-xr-x | mysqld-watcher.pl | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/mysqld-watcher.pl b/mysqld-watcher.pl new file mode 100755 index 000000000..d867c62c8 --- /dev/null +++ b/mysqld-watcher.pl @@ -0,0 +1,102 @@ +#!/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] > $LONGEST[6] ) { # the longest running query seen + @LONGEST = @F; + } +} + +# if we found anything, kill the database thread and send mail about it +# +if ($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"); +} + +# 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); + +} |