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118 lines
3.7 KiB
Perl
Executable File
118 lines
3.7 KiB
Perl
Executable File
#!/usr/bin/perl -w
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#
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# The contents of this file are subject to the Mozilla Public
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# License Version 1.1 (the "License"); you may not use this file
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# except in compliance with the License. You may obtain a copy of
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# the License at http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS
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# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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# implied. See the License for the specific language governing
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# rights and limitations under the License.
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#
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# The Original Code is the Bugzilla Bug Tracking System.
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#
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# The Initial Developer of the Original Code is Netscape Communications
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# Corporation. Portions created by Netscape are
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# Copyright (C) 2000 Netscape Communications Corporation. All
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# Rights Reserved.
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#
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# Contributor(s): Dan Mosedale <dmose@mozilla.org>
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#
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# mysqld-watcher.pl - a script that watches the running instance of
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# mysqld and kills off any long-running SELECTs against the shadow_db
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#
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use strict;
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# some configurables:
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# length of time before a thread is eligible to be killed, in seconds
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#
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my $long_query_time = 180;
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#
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# the From header for any messages sent out
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#
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my $mail_from = "root\@mothra.mozilla.org";
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#
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# the To header for any messages sent out
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#
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my $mail_to = "root";
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#
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# mail transfer agent. this should probably really be converted to a Param().
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#
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my $mta_program = "/usr/lib/sendmail -t -ODeliveryMode=deferred";
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# The array of long-running queries
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#
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my $long = {};
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# Run mysqladmin processlist twice, the first time getting complete queries
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# and the second time getting just abbreviated queries. We want complete
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# queries so we know which queries are taking too long to run, but complete
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# queries with line breaks get missed by this script, so we get abbreviated
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# queries as well to make sure we don't miss any.
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foreach my $command ("/opt/mysql/bin/mysqladmin --verbose processlist",
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"/opt/mysql/bin/mysqladmin processlist")
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{
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close(STDIN);
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open(STDIN, "$command |");
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# iterate through the running threads
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#
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while ( <STDIN> ) {
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my @F = split(/\|/);
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# if this line is not the correct number of fields, or if the thread-id
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# field contains Id, skip this line. both these cases indicate that this
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# line contains pretty-printing gunk and not thread info.
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#
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next if ( $#F != 9 || $F[1] =~ /Id/);
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if ( $F[4] =~ /shadow_bugs/ # shadowbugs database in use
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&& $F[5] =~ /Query/ # this is actually a query
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&& $F[6] > $long_query_time # this query has taken too long
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&& $F[8] =~ /(select|SELECT)/ # only kill a select
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&& !defined($long->{$F[1]}) ) # haven't seen this one already
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{
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$long->{$F[1]} = \@F;
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system("/opt/mysql/bin/mysqladmin", "kill", $F[1]);
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}
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}
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}
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# send an email message
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#
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# should perhaps be moved to somewhere more global for use in bugzilla as a
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# whole; should also do more error-checking
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#
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sub sendEmail($$$$) {
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($#_ == 3) || die("sendEmail: invalid number of arguments");
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my ($from, $to, $subject, $body) = @_;
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open(MTA, "|$mta_program");
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print MTA "From: $from\n";
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print MTA "To: $to\n";
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print MTA "Subject: $subject\n";
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print MTA "\n";
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print MTA $body;
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print MTA "\n";
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close(MTA);
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}
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# if we found anything, kill the database thread and send mail about it
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#
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if (scalar(keys(%$long))) {
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my $message = "";
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foreach my $process_id (keys(%$long)) {
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my $qry = $long->{$process_id};
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$message .= join(" ", @$qry) . "\n\n";
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}
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# fire off an email telling the maintainer that we had to kill some threads
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#
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sendEmail($mail_from, $mail_to, "long running MySQL thread(s) killed", $message);
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}
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