Added cassandra plugin to access metrics using jolokia and push them to influxdb.
Conflicts: plugins/inputs/all/all.go
This commit is contained in:
subhachandrachandra
Subhachandra Chandra
parent
8e041420cd
commit
487c2cabfe
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@ -4,6 +4,7 @@ import (
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_ "github.com/influxdata/telegraf/plugins/inputs/aerospike"
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_ "github.com/influxdata/telegraf/plugins/inputs/apache"
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_ "github.com/influxdata/telegraf/plugins/inputs/bcache"
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_ "github.com/influxdata/telegraf/plugins/inputs/cassandra"
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_ "github.com/influxdata/telegraf/plugins/inputs/couchbase"
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_ "github.com/influxdata/telegraf/plugins/inputs/couchdb"
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_ "github.com/influxdata/telegraf/plugins/inputs/disque"
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@ -0,0 +1,41 @@
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# Telegraf plugin: Cassandra
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#### Plugin arguments:
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- **context** string: Context root used for jolokia url
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- **servers** []Server: List of servers
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+ **host** string: Server's ip address or hostname
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+ **port** string: Server's listening port
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+ **username** string: Server's username for authentication (optional)
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+ **password** string: Server's password for authentication (optional)
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- **metrics** []Metric
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+ **jmx** string: Jmx path that identifies mbeans attributes
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+ **pass** []string: Attributes to retain when collecting values (TODO)
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+ **drop** []string: Attributes to drop when collecting values (TODO)
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#### Description
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The Cassandra plugin collects Cassandra/JVM metrics exposed as MBean's attributes through jolokia REST endpoint. All metrics are collected for each server configured.
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See: https://jolokia.org/
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# Measurements:
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Cassandra plugin produces one or more measurements for each metric configured, adding Server's name as `host` tag. More than one measurement is generated when querying table metrics with a wildcard for the keyspace or table name.
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Given a configuration like:
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```ini
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[cassandra]
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[[cassandra.servers]]
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host = "127.0.0.1"
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port = "878"
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[[cassandra.metrics]]
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jmx = "/java.lang:type=Memory/HeapMemoryUsage"
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```
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The collected metrics will be:
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```
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javaMemory,host=myHost,mname=HeapMemoryUsage HeapMemoryUsage_committed=1040187392,HeapMemoryUsage_init=1050673152,HeapMemoryUsage_max=1040187392,HeapMemoryUsage_used=368155000 1459551767230567084
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```
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@ -0,0 +1,307 @@
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package cassandra
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import (
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"encoding/json"
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"errors"
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"fmt"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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"io/ioutil"
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"net/http"
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"net/url"
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//"reflect"
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"strings"
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)
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type Server struct {
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Host string
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Username string
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Password string
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Port string
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}
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type Metric struct {
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Jmx string
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}
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type JolokiaClient interface {
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MakeRequest(req *http.Request) (*http.Response, error)
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}
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type JolokiaClientImpl struct {
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client *http.Client
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}
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func (c JolokiaClientImpl) MakeRequest(req *http.Request) (*http.Response, error) {
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return c.client.Do(req)
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}
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type Cassandra struct {
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jClient JolokiaClient
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Context string
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Servers []Server
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Metrics []Metric
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}
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type javaMetric struct {
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server Server
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metric Metric
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acc telegraf.Accumulator
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}
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type cassandraMetric struct {
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server Server
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metric Metric
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acc telegraf.Accumulator
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}
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type jmxMetric interface {
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addTagsFields(out map[string]interface{})
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}
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func addServerTags(server Server, tags map[string]string) {
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if server.Host != "" && server.Host != "localhost" &&
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server.Host != "127.0.0.1" {
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tags["host"] = server.Host
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}
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}
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func newJavaMetric(server Server, metric Metric,
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acc telegraf.Accumulator) *javaMetric {
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return &javaMetric{server: server, metric: metric, acc: acc}
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}
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func newCassandraMetric(server Server, metric Metric,
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acc telegraf.Accumulator) *cassandraMetric {
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return &cassandraMetric{server: server, metric: metric, acc: acc}
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}
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func addValuesAsFields(values map[string]interface{}, fields map[string]interface{},
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mname string) {
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for k, v := range values {
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if v != nil {
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fields[mname+"_"+k] = v
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}
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}
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}
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func parseJmxMetricRequest(mbean string) map[string]string {
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tokens := make(map[string]string)
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classAndPairs := strings.Split(mbean, ":")
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if classAndPairs[0] == "org.apache.cassandra.metrics" {
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tokens["class"] = "cassandra"
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} else if classAndPairs[0] == "java.lang" {
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tokens["class"] = "java"
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} else {
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return tokens
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}
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pairs := strings.Split(classAndPairs[1], ",")
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for _, pair := range pairs {
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p := strings.Split(pair, "=")
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tokens[p[0]] = p[1]
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}
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return tokens
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}
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func addTokensToTags(tokens map[string]string, tags map[string]string) {
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for k, v := range tokens {
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if k == "name" {
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tags["mname"] = v // name seems to a reserved word in influxdb
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} else if k == "class" || k == "type" {
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continue // class and type are used in the metric name
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} else {
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tags[k] = v
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}
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}
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}
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func (j javaMetric) addTagsFields(out map[string]interface{}) {
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tags := make(map[string]string)
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fields := make(map[string]interface{})
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a := out["request"].(map[string]interface{})
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attribute := a["attribute"].(string)
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mbean := a["mbean"].(string)
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tokens := parseJmxMetricRequest(mbean)
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addTokensToTags(tokens, tags)
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addServerTags(j.server, tags)
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if _, ok := tags["mname"]; !ok {
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//Queries for a single value will not return a "name" tag in the response.
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tags["mname"] = attribute
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}
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if values, ok := out["value"]; ok {
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switch t := values.(type) {
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case map[string]interface{}:
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addValuesAsFields(values.(map[string]interface{}), fields, attribute)
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case interface{}:
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fields[attribute] = t
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}
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j.acc.AddFields(tokens["class"]+tokens["type"], fields, tags)
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} else {
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fmt.Printf("Missing key 'value' in '%s' output response\n%v\n",
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j.metric.Jmx, out)
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}
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}
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func addCassandraMetric(mbean string, c cassandraMetric,
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values map[string]interface{}) {
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tags := make(map[string]string)
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fields := make(map[string]interface{})
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tokens := parseJmxMetricRequest(mbean)
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addTokensToTags(tokens, tags)
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addServerTags(c.server, tags)
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addValuesAsFields(values, fields, tags["mname"])
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c.acc.AddFields(tokens["class"]+tokens["type"], fields, tags)
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}
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func (c cassandraMetric) addTagsFields(out map[string]interface{}) {
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r := out["request"]
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tokens := parseJmxMetricRequest(r.(map[string]interface{})["mbean"].(string))
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// Requests with wildcards for keyspace or table names will return nested
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// maps in the json response
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if tokens["type"] == "Table" && (tokens["keyspace"] == "*" ||
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tokens["scope"] == "*") {
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if valuesMap, ok := out["value"]; ok {
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for k, v := range valuesMap.(map[string]interface{}) {
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addCassandraMetric(k, c, v.(map[string]interface{}))
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}
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} else {
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fmt.Printf("Missing key 'value' in '%s' output response\n%v\n",
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c.metric.Jmx, out)
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return
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}
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} else {
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if values, ok := out["value"]; ok {
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addCassandraMetric(r.(map[string]interface{})["mbean"].(string),
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c, values.(map[string]interface{}))
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} else {
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fmt.Printf("Missing key 'value' in '%s' output response\n%v\n",
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c.metric.Jmx, out)
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return
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}
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}
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}
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func (j *Cassandra) SampleConfig() string {
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return `
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# This is the context root used to compose the jolokia url
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context = "/jolokia/read"
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# List of cassandra servers exposing jolokia read service
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[[cassandra.servers]]
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# host can be skipped for localhost. host tag will be set to hostname()
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host = "192.168.103.2"
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port = "8180"
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# username = "myuser"
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# password = "mypassword"
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# List of metrics collected on above servers
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# Each metric consists of a jmx path. Pass or drop slice attributes will be
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# supported in the future.
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# This will collect all heap memory usage metrics from the jvm
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[[cassandra..metrics]]
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jmx = "/java.lang:type=Memory/HeapMemoryUsage"
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# This will collect ReadLatency metrics for all keyspaces and tables.
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# "type=Table" in the query works with Cassandra3.0. Older versions might need
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# to use "type=ColumnFamily"
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[[cassandra..metrics]]
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jmx = "/org.apache.cassandra.metrics:type=Table,keyspace=*,scope=*,name=ReadL
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atency"
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`
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}
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func (j *Cassandra) Description() string {
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return "Read Cassandra metrics through Jolokia"
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}
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func (j *Cassandra) getAttr(requestUrl *url.URL) (map[string]interface{}, error) {
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// Create + send request
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req, err := http.NewRequest("GET", requestUrl.String(), nil)
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if err != nil {
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return nil, err
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}
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resp, err := j.jClient.MakeRequest(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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// Process response
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if resp.StatusCode != http.StatusOK {
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err = fmt.Errorf("Response from url \"%s\" has status code %d (%s), expected %d (%s)",
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requestUrl,
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resp.StatusCode,
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http.StatusText(resp.StatusCode),
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http.StatusOK,
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http.StatusText(http.StatusOK))
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return nil, err
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}
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// read body
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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// Unmarshal json
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var jsonOut map[string]interface{}
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if err = json.Unmarshal([]byte(body), &jsonOut); err != nil {
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return nil, errors.New("Error decoding JSON response")
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}
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return jsonOut, nil
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}
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func (c *Cassandra) Gather(acc telegraf.Accumulator) error {
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context := c.Context
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servers := c.Servers
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metrics := c.Metrics
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for _, server := range servers {
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for _, metric := range metrics {
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var m jmxMetric
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if strings.HasPrefix(metric.Jmx, "/java.lang:") {
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m = newJavaMetric(server, metric, acc)
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} else if strings.HasPrefix(metric.Jmx,
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"/org.apache.cassandra.metrics:") {
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m = newCassandraMetric(server, metric, acc)
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}
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jmxPath := metric.Jmx
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// Prepare URL
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requestUrl, err := url.Parse("http://" + server.Host + ":" +
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server.Port + context + jmxPath)
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fmt.Printf("host %s url %s\n", server.Host, requestUrl)
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if err != nil {
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return err
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}
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if server.Username != "" || server.Password != "" {
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requestUrl.User = url.UserPassword(server.Username, server.Password)
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}
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out, err := c.getAttr(requestUrl)
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if out["status"] != 200.0 {
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fmt.Printf("URL returned with status %v\n", out["status"])
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continue
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}
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m.addTagsFields(out)
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}
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}
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return nil
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}
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func init() {
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inputs.Add("cassandra", func() telegraf.Input {
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return &Cassandra{jClient: &JolokiaClientImpl{client: &http.Client{}}}
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})
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}
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@ -0,0 +1,276 @@
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package cassandra
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import (
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_ "fmt"
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"io/ioutil"
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"net/http"
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"strings"
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"testing"
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"github.com/influxdata/telegraf/testutil"
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"github.com/stretchr/testify/assert"
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_ "github.com/stretchr/testify/require"
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)
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const validJavaMultiValueJSON = `
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{
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"request":{
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"mbean":"java.lang:type=Memory",
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"attribute":"HeapMemoryUsage",
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"type":"read"
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},
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"value":{
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"init":67108864,
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"committed":456130560,
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"max":477626368,
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"used":203288528
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},
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"timestamp":1446129191,
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"status":200
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}`
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const validCassandraMultiValueJSON = `
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{
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"request": {
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"mbean": "org.apache.cassandra.metrics:keyspace=test_keyspace1,name=ReadLatency,scope=test_table,type=Table",
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"type": "read"},
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"status": 200,
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"timestamp": 1458089229,
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"value": {
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"999thPercentile": 20.0,
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"99thPercentile": 10.0,
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"Count": 400,
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"DurationUnit": "microseconds",
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"Max": 30.0,
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"Mean": null,
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"MeanRate": 3.0,
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"Min": 1.0,
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"RateUnit": "events/second",
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"StdDev": null
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}
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}`
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const validCassandraNestedMultiValueJSON = `
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{
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"request": {
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"mbean": "org.apache.cassandra.metrics:keyspace=test_keyspace1,name=ReadLatency,scope=*,type=Table",
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"type": "read"},
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"status": 200,
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"timestamp": 1458089184,
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"value": {
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"org.apache.cassandra.metrics:keyspace=test_keyspace1,name=ReadLatency,scope=test_table1,type=Table":
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{ "999thPercentile": 1.0,
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"Count": 100,
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"DurationUnit": "microseconds",
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"OneMinuteRate": 1.0,
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"RateUnit": "events/second",
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"StdDev": null
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},
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"org.apache.cassandra.metrics:keyspace=test_keyspace2,name=ReadLatency,scope=test_table2,type=Table":
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{ "999thPercentile": 2.0,
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"Count": 200,
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"DurationUnit": "microseconds",
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"OneMinuteRate": 2.0,
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"RateUnit": "events/second",
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"StdDev": null
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}
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}
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}`
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const validSingleValueJSON = `
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{
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"request":{
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"path":"used",
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"mbean":"java.lang:type=Memory",
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"attribute":"HeapMemoryUsage",
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"type":"read"
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},
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"value":209274376,
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"timestamp":1446129256,
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"status":200
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}`
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const validJavaMultiTypeJSON = `
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{
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"request":{
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"mbean":"java.lang:name=ConcurrentMarkSweep,type=GarbageCollector",
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"attribute":"CollectionCount",
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"type":"read"
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},
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"value":1,
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"timestamp":1459316570,
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"status":200
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}`
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const invalidJSON = "I don't think this is JSON"
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const empty = ""
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var Servers = []Server{Server{Host: "10.10.10.10", Port: "8778"}}
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var HeapMetric = Metric{Jmx: "/java.lang:type=Memory/HeapMemoryUsage"}
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var ReadLatencyMetric = Metric{"/org.apache.cassandra.metrics:type=Table,keyspace=test_keyspace1,scope=test_table,name=ReadLatency"}
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var NestedReadLatencyMetric = Metric{"/org.apache.cassandra.metrics:type=Table,keyspace=test_keyspace1,scope=*,name=ReadLatency"}
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var GarbageCollectorMetric = Metric{"/java.lang:type=GarbageCollector,name=ConcurrentMarkSweep/CollectionCount"}
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var Context = "/jolokia/read"
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type jolokiaClientStub struct {
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responseBody string
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statusCode int
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}
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func (c jolokiaClientStub) MakeRequest(req *http.Request) (*http.Response, error) {
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resp := http.Response{}
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resp.StatusCode = c.statusCode
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resp.Body = ioutil.NopCloser(strings.NewReader(c.responseBody))
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return &resp, nil
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}
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// Generates a pointer to an HttpJson object that uses a mock HTTP client.
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// Parameters:
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// response : Body of the response that the mock HTTP client should return
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// statusCode: HTTP status code the mock HTTP client should return
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//
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// Returns:
|
||||
// *HttpJson: Pointer to an HttpJson object that uses the generated mock HTTP client
|
||||
func genJolokiaClientStub(response string, statusCode int, servers []Server, metrics []Metric) *Cassandra {
|
||||
return &Cassandra{
|
||||
jClient: jolokiaClientStub{responseBody: response, statusCode: statusCode},
|
||||
Context: Context,
|
||||
Servers: servers,
|
||||
Metrics: metrics,
|
||||
}
|
||||
}
|
||||
|
||||
// Test that the proper values are ignored or collected for class=Java
|
||||
func TestHttpJsonJavaMultiValue(t *testing.T) {
|
||||
cassandra := genJolokiaClientStub(validJavaMultiValueJSON, 200, Servers, []Metric{HeapMetric})
|
||||
|
||||
var acc testutil.Accumulator
|
||||
acc.SetDebug(true)
|
||||
err := cassandra.Gather(&acc)
|
||||
|
||||
assert.Nil(t, err)
|
||||
assert.Equal(t, 1, len(acc.Metrics))
|
||||
|
||||
fields := map[string]interface{}{
|
||||
"HeapMemoryUsage_init": 67108864.0,
|
||||
"HeapMemoryUsage_committed": 456130560.0,
|
||||
"HeapMemoryUsage_max": 477626368.0,
|
||||
"HeapMemoryUsage_used": 203288528.0,
|
||||
}
|
||||
tags := map[string]string{
|
||||
"host": "10.10.10.10",
|
||||
"mname": "HeapMemoryUsage",
|
||||
}
|
||||
acc.AssertContainsTaggedFields(t, "javaMemory", fields, tags)
|
||||
}
|
||||
|
||||
func TestHttpJsonJavaMultiType(t *testing.T) {
|
||||
cassandra := genJolokiaClientStub(validJavaMultiTypeJSON, 200, Servers, []Metric{GarbageCollectorMetric})
|
||||
|
||||
var acc testutil.Accumulator
|
||||
acc.SetDebug(true)
|
||||
err := cassandra.Gather(&acc)
|
||||
|
||||
assert.Nil(t, err)
|
||||
assert.Equal(t, 1, len(acc.Metrics))
|
||||
|
||||
fields := map[string]interface{}{
|
||||
"CollectionCount": 1.0,
|
||||
}
|
||||
|
||||
tags := map[string]string{
|
||||
"host": "10.10.10.10",
|
||||
"mname": "ConcurrentMarkSweep",
|
||||
}
|
||||
acc.AssertContainsTaggedFields(t, "javaGarbageCollector", fields, tags)
|
||||
}
|
||||
|
||||
// Test that the proper values are ignored or collected
|
||||
func TestHttpJsonOn404(t *testing.T) {
|
||||
|
||||
jolokia := genJolokiaClientStub(validJavaMultiValueJSON, 404, Servers,
|
||||
[]Metric{HeapMetric})
|
||||
|
||||
var acc testutil.Accumulator
|
||||
err := jolokia.Gather(&acc)
|
||||
|
||||
assert.Nil(t, err)
|
||||
assert.Equal(t, 0, len(acc.Metrics))
|
||||
}
|
||||
|
||||
// Test that the proper values are ignored or collected for class=Cassandra
|
||||
func TestHttpJsonCassandraMultiValue(t *testing.T) {
|
||||
cassandra := genJolokiaClientStub(validCassandraMultiValueJSON, 200, Servers, []Metric{ReadLatencyMetric})
|
||||
|
||||
var acc testutil.Accumulator
|
||||
err := cassandra.Gather(&acc)
|
||||
|
||||
assert.Nil(t, err)
|
||||
assert.Equal(t, 1, len(acc.Metrics))
|
||||
|
||||
fields := map[string]interface{}{
|
||||
"ReadLatency_999thPercentile": 20.0,
|
||||
"ReadLatency_99thPercentile": 10.0,
|
||||
"ReadLatency_Count": 400.0,
|
||||
"ReadLatency_DurationUnit": "microseconds",
|
||||
"ReadLatency_Max": 30.0,
|
||||
"ReadLatency_MeanRate": 3.0,
|
||||
"ReadLatency_Min": 1.0,
|
||||
"ReadLatency_RateUnit": "events/second",
|
||||
}
|
||||
|
||||
tags := map[string]string{
|
||||
"host": "10.10.10.10",
|
||||
"mname": "ReadLatency",
|
||||
"keyspace": "test_keyspace1",
|
||||
"scope": "test_table",
|
||||
}
|
||||
acc.AssertContainsTaggedFields(t, "cassandraTable", fields, tags)
|
||||
}
|
||||
|
||||
// Test that the proper values are ignored or collected for class=Cassandra with
|
||||
// nested values
|
||||
func TestHttpJsonCassandraNestedMultiValue(t *testing.T) {
|
||||
cassandra := genJolokiaClientStub(validCassandraNestedMultiValueJSON, 200, Servers, []Metric{NestedReadLatencyMetric})
|
||||
|
||||
var acc testutil.Accumulator
|
||||
acc.SetDebug(true)
|
||||
err := cassandra.Gather(&acc)
|
||||
|
||||
assert.Nil(t, err)
|
||||
assert.Equal(t, 2, len(acc.Metrics))
|
||||
|
||||
fields1 := map[string]interface{}{
|
||||
"ReadLatency_999thPercentile": 1.0,
|
||||
"ReadLatency_Count": 100.0,
|
||||
"ReadLatency_DurationUnit": "microseconds",
|
||||
"ReadLatency_OneMinuteRate": 1.0,
|
||||
"ReadLatency_RateUnit": "events/second",
|
||||
}
|
||||
|
||||
fields2 := map[string]interface{}{
|
||||
"ReadLatency_999thPercentile": 2.0,
|
||||
"ReadLatency_Count": 200.0,
|
||||
"ReadLatency_DurationUnit": "microseconds",
|
||||
"ReadLatency_OneMinuteRate": 2.0,
|
||||
"ReadLatency_RateUnit": "events/second",
|
||||
}
|
||||
|
||||
tags1 := map[string]string{
|
||||
"host": "10.10.10.10",
|
||||
"mname": "ReadLatency",
|
||||
"keyspace": "test_keyspace1",
|
||||
"scope": "test_table1",
|
||||
}
|
||||
|
||||
tags2 := map[string]string{
|
||||
"host": "10.10.10.10",
|
||||
"mname": "ReadLatency",
|
||||
"keyspace": "test_keyspace2",
|
||||
"scope": "test_table2",
|
||||
}
|
||||
|
||||
acc.AssertContainsTaggedFields(t, "cassandraTable", fields1, tags1)
|
||||
acc.AssertContainsTaggedFields(t, "cassandraTable", fields2, tags2)
|
||||
}
|
||||
Loading…
Reference in New Issue