check_cassandra_heap.pl

#!/usr/bin/perl -T
# nagios: -epn
#
#  Author: Hari Sekhon
#  Date: 2013-11-04 02:44:22 +0000 (Mon, 04 Nov 2013)
#
#  https://github.com/harisekhon/nagios-plugins
#
#  License: see accompanying LICENSE file
#  

$DESCRIPTION = "Nagios Plugin to check the Heap used on a single Cassandra node using nodetool.

Can specify a remote host and port otherwise it checks the local node's heap (for calling over NRPE on each Cassandra node)

Written and tested against Cassandra 2.0.1 and 2.0.9, DataStax Community Edition";

$VERSION = "0.2.1";

use strict;
use warnings;
BEGIN {
    use File::Basename;
    use lib dirname(__FILE__) . "/lib";
}
use HariSekhonUtils;
use HariSekhon::Cassandra::Nodetool;

set_threshold_defaults(80, 90);

%options = (
    %nodetool_options,
    %thresholdoptions,
);
splice @usage_order, 0, 0, 'nodetool';

get_options();

($nodetool, $host, $port, $user, $password) = validate_nodetool_options($nodetool, $host, $port, $user, $password);
validate_thresholds(undef, undef, { "simple" => "upper", "integer" => 0, "positive" => 1, "max" => 100 });

vlog2;
set_timeout();

$status = "OK";

my $options = nodetool_options($host, $port, $user, $password);
my $cmd     = "${nodetool} ${options}info";

vlog2 "fetching cluster node heap information";
my @output = cmd($cmd);

my %heap = ( units => undef, used => undef, total => undef);
foreach(@output){
    check_nodetool_errors($_);
    if(/^\s*Heap\s*Memory\s*\((\w+)\)\s*:\s*(\d+(?:\.\d+)?)\s*\/\s*(\d+(?:\.\d+)?)/){
        $heap{"units"} = $1;
        $heap{"used"}  = $2;
        $heap{"total"} = $3;
        last;
    }
}
foreach(sort keys %heap){
    quit "UNKNOWN", "failed to determine heap $_ from nodetool output"  unless(defined($heap{$_}));
}

my $heap_used_percent = sprintf("%.2f", $heap{"used"} / $heap{"total"} * 100);

$msg = "$heap_used_percent% heap used ($heap{used}/$heap{total} $heap{units})";
check_thresholds($heap_used_percent);
$msg .= " | 'heap_used_%'=$heap_used_percent%";
msg_perf_thresholds();
$heap{"units"} = isNagiosUnit($heap{"units"}) || "";
$msg .= " heap_used=$heap{used}$heap{units} heap_total=$heap{total}$heap{units}";

vlog2;
quit $status, $msg;