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lustre2.go
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lustre2.go
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/*
Lustre 2.x telegraf plugin
Lustre (http://lustre.org/) is an open-source, parallel file system
for HPC environments. It stores statistics about its activity in
/proc
*/
package lustre2
import (
"path/filepath"
"strconv"
"strings"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/inputs"
)
// Lustre proc files can change between versions, so we want to future-proof
// by letting people choose what to look at.
type Lustre2 struct {
Ost_procfiles []string
Mds_procfiles []string
// allFields maps and OST name to the metric fields associated with that OST
allFields map[string]map[string]interface{}
}
var sampleConfig = `
# An array of /proc globs to search for Lustre stats
# If not specified, the default will work on Lustre 2.5.x
#
# ost_procfiles = ["/proc/fs/lustre/obdfilter/*/stats", "/proc/fs/lustre/osd-ldiskfs/*/stats"]
# mds_procfiles = ["/proc/fs/lustre/mdt/*/md_stats"]
`
/* The wanted fields would be a []string if not for the
lines that start with read_bytes/write_bytes and contain
both the byte count and the function call count
*/
type mapping struct {
inProc string // What to look for at the start of a line in /proc/fs/lustre/*
field uint32 // which field to extract from that line
reportAs string // What measurement name to use
tag string // Additional tag to add for this metric
}
var wanted_ost_fields = []*mapping{
{
inProc: "write_bytes",
field: 6,
reportAs: "write_bytes",
},
{ // line starts with 'write_bytes', but value write_calls is in second column
inProc: "write_bytes",
field: 1,
reportAs: "write_calls",
},
{
inProc: "read_bytes",
field: 6,
reportAs: "read_bytes",
},
{ // line starts with 'read_bytes', but value read_calls is in second column
inProc: "read_bytes",
field: 1,
reportAs: "read_calls",
},
{
inProc: "cache_hit",
},
{
inProc: "cache_miss",
},
{
inProc: "cache_access",
},
}
var wanted_mds_fields = []*mapping{
{
inProc: "open",
},
{
inProc: "close",
},
{
inProc: "mknod",
},
{
inProc: "link",
},
{
inProc: "unlink",
},
{
inProc: "mkdir",
},
{
inProc: "rmdir",
},
{
inProc: "rename",
},
{
inProc: "getattr",
},
{
inProc: "setattr",
},
{
inProc: "getxattr",
},
{
inProc: "setxattr",
},
{
inProc: "statfs",
},
{
inProc: "sync",
},
{
inProc: "samedir_rename",
},
{
inProc: "crossdir_rename",
},
}
func (l *Lustre2) GetLustreProcStats(fileglob string, wanted_fields []*mapping, acc inputs.Accumulator) error {
files, err := filepath.Glob(fileglob)
if err != nil {
return err
}
for _, file := range files {
/* Turn /proc/fs/lustre/obdfilter/<ost_name>/stats and similar
* into just the object store target name
* Assumpion: the target name is always second to last,
* which is true in Lustre 2.1->2.5
*/
path := strings.Split(file, "/")
name := path[len(path)-2]
var fields map[string]interface{}
fields, ok := l.allFields[name]
if !ok {
fields = make(map[string]interface{})
l.allFields[name] = fields
}
lines, err := internal.ReadLines(file)
if err != nil {
return err
}
for _, line := range lines {
parts := strings.Fields(line)
for _, wanted := range wanted_fields {
var data uint64
if parts[0] == wanted.inProc {
wanted_field := wanted.field
// if not set, assume field[1]. Shouldn't be field[0], as
// that's a string
if wanted_field == 0 {
wanted_field = 1
}
data, err = strconv.ParseUint((parts[wanted_field]), 10, 64)
if err != nil {
return err
}
report_name := wanted.inProc
if wanted.reportAs != "" {
report_name = wanted.reportAs
}
fields[report_name] = data
}
}
}
}
return nil
}
// SampleConfig returns sample configuration message
func (l *Lustre2) SampleConfig() string {
return sampleConfig
}
// Description returns description of Lustre2 plugin
func (l *Lustre2) Description() string {
return "Read metrics from local Lustre service on OST, MDS"
}
// Gather reads stats from all lustre targets
func (l *Lustre2) Gather(acc inputs.Accumulator) error {
l.allFields = make(map[string]map[string]interface{})
if len(l.Ost_procfiles) == 0 {
// read/write bytes are in obdfilter/<ost_name>/stats
err := l.GetLustreProcStats("/proc/fs/lustre/obdfilter/*/stats",
wanted_ost_fields, acc)
if err != nil {
return err
}
// cache counters are in osd-ldiskfs/<ost_name>/stats
err = l.GetLustreProcStats("/proc/fs/lustre/osd-ldiskfs/*/stats",
wanted_ost_fields, acc)
if err != nil {
return err
}
}
if len(l.Mds_procfiles) == 0 {
// Metadata server stats
err := l.GetLustreProcStats("/proc/fs/lustre/mdt/*/md_stats",
wanted_mds_fields, acc)
if err != nil {
return err
}
}
for _, procfile := range l.Ost_procfiles {
err := l.GetLustreProcStats(procfile, wanted_ost_fields, acc)
if err != nil {
return err
}
}
for _, procfile := range l.Mds_procfiles {
err := l.GetLustreProcStats(procfile, wanted_mds_fields, acc)
if err != nil {
return err
}
}
for name, fields := range l.allFields {
tags := map[string]string{
"name": name,
}
acc.AddFields("lustre2", fields, tags)
}
return nil
}
func init() {
inputs.Add("lustre2", func() inputs.Input {
return &Lustre2{}
})
}