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Implemented ceph collector (#1172) 

- records metrics from the output of mon and osd socket perf
  dumps.
This commit is contained in:
robinpercy-xm 2016-05-18 07:48:44 -07:00 committed by Cameron Sparr
parent f32916a5bd
commit 69dfe63809
5 changed files with 1059 additions and 0 deletions
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18
etc/telegraf.conf
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@ -369,6 +369,24 @@
# INPUT PLUGINS # # INPUT PLUGINS #
############################################################################### ###############################################################################
# # Collects performance metrics from the MON and OSD nodes in a Ceph storage cluster.
# [[inputs.ceph]]
# ## All configuration values are optional, defaults are shown below
#
# ## location of ceph binary
# ceph_binary = "/usr/bin/ceph"
#
# ## directory in which to look for socket files
# socket_dir = "/var/run/ceph"
#
# ## prefix of MON and OSD socket files, used to determine socket type
# mon_prefix = "ceph-mon"
# osd_prefix = "ceph-osd"
#
# ## suffix used to identify socket files
# socket_suffix = "asok"
# Read metrics about cpu usage # Read metrics about cpu usage
[[inputs.cpu]] [[inputs.cpu]]
## Whether to report per-cpu stats or not ## Whether to report per-cpu stats or not

1
plugins/inputs/all/all.go
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@ -5,6 +5,7 @@ import (
_ "github.com/influxdata/telegraf/plugins/inputs/apache" _ "github.com/influxdata/telegraf/plugins/inputs/apache"
_ "github.com/influxdata/telegraf/plugins/inputs/bcache" _ "github.com/influxdata/telegraf/plugins/inputs/bcache"
_ "github.com/influxdata/telegraf/plugins/inputs/cassandra" _ "github.com/influxdata/telegraf/plugins/inputs/cassandra"
_ "github.com/influxdata/telegraf/plugins/inputs/ceph"
_ "github.com/influxdata/telegraf/plugins/inputs/cloudwatch" _ "github.com/influxdata/telegraf/plugins/inputs/cloudwatch"
_ "github.com/influxdata/telegraf/plugins/inputs/couchbase" _ "github.com/influxdata/telegraf/plugins/inputs/couchbase"
_ "github.com/influxdata/telegraf/plugins/inputs/couchdb" _ "github.com/influxdata/telegraf/plugins/inputs/couchdb"

109
plugins/inputs/ceph/README.md Normal file
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@ -0,0 +1,109 @@
# Ceph Storage Input Plugin
Collects performance metrics from the MON and OSD nodes in a Ceph storage cluster.
The plugin works by scanning the configured SocketDir for OSD and MON socket files. When it finds
a MON socket, it runs **ceph --admin-daemon $file perfcounters_dump**. For OSDs it runs **ceph --admin-daemon $file perf dump**
The resulting JSON is parsed and grouped into collections, based on top-level key. Top-level keys are
used as collection tags, and all sub-keys are flattened. For example:
```
{
"paxos": {
"refresh": 9363435,
"refresh_latency": {
"avgcount": 9363435,
"sum": 5378.794002000
}
}
}
```
Would be parsed into the following metrics, all of which would be tagged with collection=paxos:
- refresh = 9363435
- refresh_latency.avgcount: 9363435
- refresh_latency.sum: 5378.794002000
### Configuration:
```
# Collects performance metrics from the MON and OSD nodes in a Ceph storage cluster.
[[inputs.ceph]]
## All configuration values are optional, defaults are shown below
## location of ceph binary
ceph_binary = "/usr/bin/ceph"
## directory in which to look for socket files
socket_dir = "/var/run/ceph"
## prefix of MON and OSD socket files, used to determine socket type
mon_prefix = "ceph-mon"
osd_prefix = "ceph-osd"
## suffix used to identify socket files
socket_suffix = "asok"
```
### Measurements & Fields:
All fields are collected under the **ceph** measurement and stored as float64s. For a full list of fields, see the sample perf dumps in ceph_test.go.
### Tags:
All measurements will have the following tags:
- type: either 'osd' or 'mon' to indicate which type of node was queried
- id: a unique string identifier, parsed from the socket file name for the node
- collection: the top-level key under which these fields were reported. Possible values are:
- for MON nodes:
- cluster
- leveldb
- mon
- paxos
- throttle-mon_client_bytes
- throttle-mon_daemon_bytes
- throttle-msgr_dispatch_throttler-mon
- for OSD nodes:
- WBThrottle
- filestore
- leveldb
- mutex-FileJournal::completions_lock
- mutex-FileJournal::finisher_lock
- mutex-FileJournal::write_lock
- mutex-FileJournal::writeq_lock
- mutex-JOS::ApplyManager::apply_lock
- mutex-JOS::ApplyManager::com_lock
- mutex-JOS::SubmitManager::lock
- mutex-WBThrottle::lock
- objecter
- osd
- recoverystate_perf
- throttle-filestore_bytes
- throttle-filestore_ops
- throttle-msgr_dispatch_throttler-client
- throttle-msgr_dispatch_throttler-cluster
- throttle-msgr_dispatch_throttler-hb_back_server
- throttle-msgr_dispatch_throttler-hb_front_serve
- throttle-msgr_dispatch_throttler-hbclient
- throttle-msgr_dispatch_throttler-ms_objecter
- throttle-objecter_bytes
- throttle-objecter_ops
- throttle-osd_client_bytes
- throttle-osd_client_messages
### Example Output:
<pre>
telegraf -test -config /etc/telegraf/telegraf.conf -config-directory /etc/telegraf/telegraf.d -input-filter ceph
* Plugin: ceph, Collection 1
> ceph,collection=paxos, id=node-2,role=openstack,type=mon accept_timeout=0,begin=14931264,begin_bytes.avgcount=14931264,begin_bytes.sum=180309683362,begin_keys.avgcount=0,begin_keys.sum=0,begin_latency.avgcount=14931264,begin_latency.sum=9293.29589,collect=1,collect_bytes.avgcount=1,collect_bytes.sum=24,collect_keys.avgcount=1,collect_keys.sum=1,collect_latency.avgcount=1,collect_latency.sum=0.00028,collect_timeout=0,collect_uncommitted=0,commit=14931264,commit_bytes.avgcount=0,commit_bytes.sum=0,commit_keys.avgcount=0,commit_keys.sum=0,commit_latency.avgcount=0,commit_latency.sum=0,lease_ack_timeout=0,lease_timeout=0,new_pn=0,new_pn_latency.avgcount=0,new_pn_latency.sum=0,refresh=14931264,refresh_latency.avgcount=14931264,refresh_latency.sum=8706.98498,restart=4,share_state=0,share_state_bytes.avgcount=0,share_state_bytes.sum=0,share_state_keys.avgcount=0,share_state_keys.sum=0,start_leader=0,start_peon=1,store_state=14931264,store_state_bytes.avgcount=14931264,store_state_bytes.sum=353119959211,store_state_keys.avgcount=14931264,store_state_keys.sum=289807523,store_state_latency.avgcount=14931264,store_state_latency.sum=10952.835724 1462821234814535148
> ceph,collection=throttle-mon_client_bytes,id=node-2,type=mon get=1413017,get_or_fail_fail=0,get_or_fail_success=0,get_sum=71211705,max=104857600,put=1413013,put_sum=71211459,take=0,take_sum=0,val=246,wait.avgcount=0,wait.sum=0 1462821234814737219
> ceph,collection=throttle-mon_daemon_bytes,id=node-2,type=mon get=4058121,get_or_fail_fail=0,get_or_fail_success=0,get_sum=6027348117,max=419430400,put=4058121,put_sum=6027348117,take=0,take_sum=0,val=0,wait.avgcount=0,wait.sum=0 1462821234814815661
> ceph,collection=throttle-msgr_dispatch_throttler-mon,id=node-2,type=mon get=54276277,get_or_fail_fail=0,get_or_fail_success=0,get_sum=370232877040,max=104857600,put=54276277,put_sum=370232877040,take=0,take_sum=0,val=0,wait.avgcount=0,wait.sum=0 1462821234814872064
</pre>

249
plugins/inputs/ceph/ceph.go Normal file
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@ -0,0 +1,249 @@
package ceph
import (
"bytes"
"encoding/json"
"fmt"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
"io/ioutil"
"log"
"os/exec"
"path/filepath"
"strings"
)
const (
measurement = "ceph"
typeMon = "monitor"
typeOsd = "osd"
osdPrefix = "ceph-osd"
monPrefix = "ceph-mon"
sockSuffix = "asok"
)
type Ceph struct {
CephBinary string
OsdPrefix string
MonPrefix string
SocketDir string
SocketSuffix string
}
func (c *Ceph) setDefaults() {
if c.CephBinary == "" {
c.CephBinary = "/usr/bin/ceph"
}
if c.OsdPrefix == "" {
c.OsdPrefix = osdPrefix
}
if c.MonPrefix == "" {
c.MonPrefix = monPrefix
}
if c.SocketDir == "" {
c.SocketDir = "/var/run/ceph"
}
if c.SocketSuffix == "" {
c.SocketSuffix = sockSuffix
}
}
func (c *Ceph) Description() string {
return "Collects performance metrics from the MON and OSD nodes in a Ceph storage cluster."
}
var sampleConfig = `
## All configuration values are optional, defaults are shown below
## location of ceph binary
ceph_binary = "/usr/bin/ceph"
## directory in which to look for socket files
socket_dir = "/var/run/ceph"
## prefix of MON and OSD socket files, used to determine socket type
mon_prefix = "ceph-mon"
osd_prefix = "ceph-osd"
## suffix used to identify socket files
socket_suffix = "asok"
`
func (c *Ceph) SampleConfig() string {
return sampleConfig
}
func (c *Ceph) Gather(acc telegraf.Accumulator) error {
c.setDefaults()
sockets, err := findSockets(c)
if err != nil {
return fmt.Errorf("failed to find sockets at path '%s': %v", c.SocketDir, err)
}
for _, s := range sockets {
dump, err := perfDump(c.CephBinary, s)
if err != nil {
log.Printf("error reading from socket '%s': %v", s.socket, err)
continue
}
data, err := parseDump(dump)
if err != nil {
log.Printf("error parsing dump from socket '%s': %v", s.socket, err)
continue
}
for tag, metrics := range *data {
acc.AddFields(measurement,
map[string]interface{}(metrics),
map[string]string{"type": s.sockType, "id": s.sockId, "collection": tag})
}
}
return nil
}
func init() {
inputs.Add(measurement, func() telegraf.Input { return &Ceph{} })
}
var perfDump = func(binary string, socket *socket) (string, error) {
cmdArgs := []string{"--admin-daemon", socket.socket}
if socket.sockType == typeOsd {
cmdArgs = append(cmdArgs, "perf", "dump")
} else if socket.sockType == typeMon {
cmdArgs = append(cmdArgs, "perfcounters_dump")
} else {
return "", fmt.Errorf("ignoring unknown socket type: %s", socket.sockType)
}
cmd := exec.Command(binary, cmdArgs...)
var out bytes.Buffer
cmd.Stdout = &out
err := cmd.Run()
if err != nil {
return "", fmt.Errorf("error running ceph dump: %s", err)
}
return out.String(), nil
}
var findSockets = func(c *Ceph) ([]*socket, error) {
listing, err := ioutil.ReadDir(c.SocketDir)
if err != nil {
return []*socket{}, fmt.Errorf("Failed to read socket directory '%s': %v", c.SocketDir, err)
}
sockets := make([]*socket, 0, len(listing))
for _, info := range listing {
f := info.Name()
var sockType string
var sockPrefix string
if strings.HasPrefix(f, c.MonPrefix) {
sockType = typeMon
sockPrefix = monPrefix
}
if strings.HasPrefix(f, c.OsdPrefix) {
sockType = typeOsd
sockPrefix = osdPrefix
}
if sockType == typeOsd || sockType == typeMon {
path := filepath.Join(c.SocketDir, f)
sockets = append(sockets, &socket{parseSockId(f, sockPrefix, c.SocketSuffix), sockType, path})
}
}
return sockets, nil
}
func parseSockId(fname, prefix, suffix string) string {
s := fname
s = strings.TrimPrefix(s, prefix)
s = strings.TrimSuffix(s, suffix)
s = strings.Trim(s, ".-_")
return s
}
type socket struct {
sockId string
sockType string
socket string
}
type metric struct {
pathStack []string // lifo stack of name components
value float64
}
// Pops names of pathStack to build the flattened name for a metric
func (m *metric) name() string {
buf := bytes.Buffer{}
for i := len(m.pathStack) - 1; i >= 0; i-- {
if buf.Len() > 0 {
buf.WriteString(".")
}
buf.WriteString(m.pathStack[i])
}
return buf.String()
}
type metricMap map[string]interface{}
type taggedMetricMap map[string]metricMap
// Parses a raw JSON string into a taggedMetricMap
// Delegates the actual parsing to newTaggedMetricMap(..)
func parseDump(dump string) (*taggedMetricMap, error) {
data := make(map[string]interface{})
err := json.Unmarshal([]byte(dump), &data)
if err != nil {
return nil, fmt.Errorf("failed to parse json: '%s': %v", dump, err)
}
tmm := newTaggedMetricMap(data)
if err != nil {
return nil, fmt.Errorf("failed to tag dataset: '%v': %v", tmm, err)
}
return tmm, nil
}
// Builds a TaggedMetricMap out of a generic string map.
// The top-level key is used as a tag and all sub-keys are flattened into metrics
func newTaggedMetricMap(data map[string]interface{}) *taggedMetricMap {
tmm := make(taggedMetricMap)
for tag, datapoints := range data {
mm := make(metricMap)
for _, m := range flatten(datapoints) {
mm[m.name()] = m.value
}
tmm[tag] = mm
}
return &tmm
}
// Recursively flattens any k-v hierarchy present in data.
// Nested keys are flattened into ordered slices associated with a metric value.
// The key slices are treated as stacks, and are expected to be reversed and concatenated
// when passed as metrics to the accumulator. (see (*metric).name())
func flatten(data interface{}) []*metric {
var metrics []*metric
switch val := data.(type) {
case float64:
metrics = []*metric{&metric{make([]string, 0, 1), val}}
case map[string]interface{}:
metrics = make([]*metric, 0, len(val))
for k, v := range val {
for _, m := range flatten(v) {
m.pathStack = append(m.pathStack, k)
metrics = append(metrics, m)
}
}
default:
log.Printf("Ignoring unexpected type '%T' for value %v", val, val)
}
return metrics
}

682
plugins/inputs/ceph/ceph_test.go Normal file
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@ -0,0 +1,682 @@
package ceph
import (
"fmt"
"github.com/influxdata/telegraf/testutil"
"github.com/stretchr/testify/assert"
"io/ioutil"
"os"
"path"
"strconv"
"strings"
"testing"
)
const (
epsilon = float64(0.00000001)
)
func TestParseSockId(t *testing.T) {
s := parseSockId(sockFile(osdPrefix, 1), osdPrefix, sockSuffix)
assert.Equal(t, s, "1")
}
func TestParseMonDump(t *testing.T) {
dump, err := parseDump(monPerfDump)
assert.NoError(t, err)
assert.InEpsilon(t, 5678670180, (*dump)["cluster"]["osd_kb_used"], epsilon)
assert.InEpsilon(t, 6866.540527000, (*dump)["paxos"]["store_state_latency.sum"], epsilon)
}
func TestParseOsdDump(t *testing.T) {
dump, err := parseDump(osdPerfDump)
assert.NoError(t, err)
assert.InEpsilon(t, 552132.109360000, (*dump)["filestore"]["commitcycle_interval.sum"], epsilon)
assert.Equal(t, float64(0), (*dump)["mutex-FileJournal::finisher_lock"]["wait.avgcount"])
}
func TestGather(t *testing.T) {
saveFind := findSockets
saveDump := perfDump
defer func() {
findSockets = saveFind
perfDump = saveDump
}()
findSockets = func(c *Ceph) ([]*socket, error) {
return []*socket{&socket{"osd.1", typeOsd, ""}}, nil
}
perfDump = func(binary string, s *socket) (string, error) {
return osdPerfDump, nil
}
acc := &testutil.Accumulator{}
c := &Ceph{}
c.Gather(acc)
}
func TestFindSockets(t *testing.T) {
tmpdir, err := ioutil.TempDir("", "socktest")
assert.NoError(t, err)
defer func() {
err := os.Remove(tmpdir)
assert.NoError(t, err)
}()
c := &Ceph{
CephBinary: "foo",
SocketDir: tmpdir,
}
c.setDefaults()
for _, st := range sockTestParams {
createTestFiles(tmpdir, st)
sockets, err := findSockets(c)
assert.NoError(t, err)
for i := 1; i <= st.osds; i++ {
assertFoundSocket(t, tmpdir, typeOsd, i, sockets)
}
for i := 1; i <= st.mons; i++ {
assertFoundSocket(t, tmpdir, typeMon, i, sockets)
}
cleanupTestFiles(tmpdir, st)
}
}
func assertFoundSocket(t *testing.T, dir, sockType string, i int, sockets []*socket) {
var prefix string
if sockType == typeOsd {
prefix = osdPrefix
} else {
prefix = monPrefix
}
expected := path.Join(dir, sockFile(prefix, i))
found := false
for _, s := range sockets {
fmt.Printf("Checking %s\n", s.socket)
if s.socket == expected {
found = true
assert.Equal(t, s.sockType, sockType, "Unexpected socket type for '%s'", s)
assert.Equal(t, s.sockId, strconv.Itoa(i))
}
}
assert.True(t, found, "Did not find socket: %s", expected)
}
func sockFile(prefix string, i int) string {
return strings.Join([]string{prefix, strconv.Itoa(i), sockSuffix}, ".")
}
func createTestFiles(dir string, st *SockTest) {
writeFile := func(prefix string, i int) {
f := sockFile(prefix, i)
fpath := path.Join(dir, f)
ioutil.WriteFile(fpath, []byte(""), 0777)
}
tstFileApply(st, writeFile)
}
func cleanupTestFiles(dir string, st *SockTest) {
rmFile := func(prefix string, i int) {
f := sockFile(prefix, i)
fpath := path.Join(dir, f)
err := os.Remove(fpath)
if err != nil {
fmt.Printf("Error removing test file %s: %v\n", fpath, err)
}
}
tstFileApply(st, rmFile)
}
func tstFileApply(st *SockTest, fn func(prefix string, i int)) {
for i := 1; i <= st.osds; i++ {
fn(osdPrefix, i)
}
for i := 1; i <= st.mons; i++ {
fn(monPrefix, i)
}
}
type SockTest struct {
osds int
mons int
}
var sockTestParams = []*SockTest{
&SockTest{
osds: 2,
mons: 2,
},
&SockTest{
mons: 1,
},
&SockTest{
osds: 1,
},
&SockTest{},
}
var monPerfDump = `
{ "cluster": { "num_mon": 2,
"num_mon_quorum": 2,
"num_osd": 26,
"num_osd_up": 26,
"num_osd_in": 26,
"osd_epoch": 3306,
"osd_kb": 11487846448,
"osd_kb_used": 5678670180,
"osd_kb_avail": 5809176268,
"num_pool": 12,
"num_pg": 768,
"num_pg_active_clean": 768,
"num_pg_active": 768,
"num_pg_peering": 0,
"num_object": 397616,
"num_object_degraded": 0,
"num_object_unfound": 0,
"num_bytes": 2917848227467,
"num_mds_up": 0,
"num_mds_in": 0,
"num_mds_failed": 0,
"mds_epoch": 1},
"leveldb": { "leveldb_get": 321950312,
"leveldb_transaction": 18729922,
"leveldb_compact": 0,
"leveldb_compact_range": 74141,
"leveldb_compact_queue_merge": 0,
"leveldb_compact_queue_len": 0},
"mon": {},
"paxos": { "start_leader": 0,
"start_peon": 1,
"restart": 4,
"refresh": 9363435,
"refresh_latency": { "avgcount": 9363435,
"sum": 5378.794002000},
"begin": 9363435,
"begin_keys": { "avgcount": 0,
"sum": 0},
"begin_bytes": { "avgcount": 9363435,
"sum": 110468605489},
"begin_latency": { "avgcount": 9363435,
"sum": 5850.060682000},
"commit": 9363435,
"commit_keys": { "avgcount": 0,
"sum": 0},
"commit_bytes": { "avgcount": 0,
"sum": 0},
"commit_latency": { "avgcount": 0,
"sum": 0.000000000},
"collect": 1,
"collect_keys": { "avgcount": 1,
"sum": 1},
"collect_bytes": { "avgcount": 1,
"sum": 24},
"collect_latency": { "avgcount": 1,
"sum": 0.000280000},
"collect_uncommitted": 0,
"collect_timeout": 0,
"accept_timeout": 0,
"lease_ack_timeout": 0,
"lease_timeout": 0,
"store_state": 9363435,
"store_state_keys": { "avgcount": 9363435,
"sum": 176572789},
"store_state_bytes": { "avgcount": 9363435,
"sum": 216355887217},
"store_state_latency": { "avgcount": 9363435,
"sum": 6866.540527000},
"share_state": 0,
"share_state_keys": { "avgcount": 0,
"sum": 0},
"share_state_bytes": { "avgcount": 0,
"sum": 0},
"new_pn": 0,
"new_pn_latency": { "avgcount": 0,
"sum": 0.000000000}},
"throttle-mon_client_bytes": { "val": 246,
"max": 104857600,
"get": 896030,
"get_sum": 45854374,
"get_or_fail_fail": 0,
"get_or_fail_success": 0,
"take": 0,
"take_sum": 0,
"put": 896026,
"put_sum": 45854128,
"wait": { "avgcount": 0,
"sum": 0.000000000}},
"throttle-mon_daemon_bytes": { "val": 0,
"max": 419430400,
"get": 2773768,
"get_sum": 3627676976,
"get_or_fail_fail": 0,
"get_or_fail_success": 0,
"take": 0,
"take_sum": 0,
"put": 2773768,
"put_sum": 3627676976,
"wait": { "avgcount": 0,
"sum": 0.000000000}},
"throttle-msgr_dispatch_throttler-mon": { "val": 0,
"max": 104857600,
"get": 34504949,
"get_sum": 226860281124,
"get_or_fail_fail": 0,
"get_or_fail_success": 0,
"take": 0,
"take_sum": 0,
"put": 34504949,
"put_sum": 226860281124,
"wait": { "avgcount": 0,
"sum": 0.000000000}}}
`
var osdPerfDump = `
{ "WBThrottle": { "bytes_dirtied": 28405539,
"bytes_wb": 0,
"ios_dirtied": 93,
"ios_wb": 0,
"inodes_dirtied": 86,
"inodes_wb": 0},
"filestore": { "journal_queue_max_ops": 0,
"journal_queue_ops": 0,
"journal_ops": 1108008,
"journal_queue_max_bytes": 0,
"journal_queue_bytes": 0,
"journal_bytes": 73233416196,
"journal_latency": { "avgcount": 1108008,
"sum": 290.981036000},
"journal_wr": 1091866,
"journal_wr_bytes": { "avgcount": 1091866,
"sum": 74925682688},
"journal_full": 0,
"committing": 0,
"commitcycle": 110389,
"commitcycle_interval": { "avgcount": 110389,
"sum": 552132.109360000},
"commitcycle_latency": { "avgcount": 110389,
"sum": 178.657804000},
"op_queue_max_ops": 50,
"op_queue_ops": 0,
"ops": 1108008,
"op_queue_max_bytes": 104857600,
"op_queue_bytes": 0,
"bytes": 73226768148,
"apply_latency": { "avgcount": 1108008,
"sum": 947.742722000},
"queue_transaction_latency_avg": { "avgcount": 1108008,
"sum": 0.511327000}},
"leveldb": { "leveldb_get": 4361221,
"leveldb_transaction": 4351276,
"leveldb_compact": 0,
"leveldb_compact_range": 0,
"leveldb_compact_queue_merge": 0,
"leveldb_compact_queue_len": 0},
"mutex-FileJournal::completions_lock": { "wait": { "avgcount": 0,
"sum": 0.000000000}},
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`