83 lines
2.5 KiB
Go
83 lines
2.5 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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/*
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Package mntr fetches metrics from ZooKeeper by using the mntr command which was
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added to ZooKeeper in version 3.4.0.
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See the mntr command documentation at
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https://zookeeper.apache.org/doc/trunk/zookeeperAdmin.html
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ZooKeeper mntr Command Output
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$ echo mntr | nc localhost 2185
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zk_version 3.4.8--1, built on 02/06/2016 03:18 GMT
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zk_avg_latency 0
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zk_max_latency 0
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zk_min_latency 0
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zk_packets_received 10
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zk_packets_sent 9
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zk_num_alive_connections 1
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zk_outstanding_requests 0
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zk_server_state standalone
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zk_znode_count 4
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zk_watch_count 0
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zk_ephemerals_count 0
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zk_approximate_data_size 27
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zk_open_file_descriptor_count 25
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zk_max_file_descriptor_count 1048576
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*/
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package mntr
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import (
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"github.com/elastic/beats/libbeat/common"
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"github.com/elastic/beats/metricbeat/mb"
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"github.com/elastic/beats/metricbeat/mb/parse"
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"github.com/elastic/beats/metricbeat/module/zookeeper"
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"github.com/pkg/errors"
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)
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func init() {
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mb.Registry.MustAddMetricSet("zookeeper", "mntr", New,
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mb.WithHostParser(parse.PassThruHostParser),
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mb.DefaultMetricSet(),
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)
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}
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// MetricSet for fetching ZooKeeper health metrics.
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type MetricSet struct {
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mb.BaseMetricSet
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}
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// New creates new instance of MetricSet.
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func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
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return &MetricSet{
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BaseMetricSet: base,
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}, nil
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}
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// Fetch fetches metrics from ZooKeeper by making a tcp connection to the
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// command port and sending the "mntr" command and parsing the output.
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func (m *MetricSet) Fetch() (common.MapStr, error) {
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outputReader, err := zookeeper.RunCommand("mntr", m.Host(), m.Module().Config().Timeout)
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if err != nil {
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return nil, errors.Wrap(err, "mntr command failed")
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}
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return eventMapping(outputReader), nil
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}
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