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history.go
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history.go
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package main
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"log"
"path"
"strconv"
"strings"
"time"
"github.com/colinmarc/hdfs"
)
var jhistHeader = []byte("Avro-Json")
type histEvent struct {
Type string `json:"type"`
Event json.RawMessage `json:"event"`
}
type jobSubmittedEvent struct {
Ev struct {
ID string `json:"jobid"`
Name string `json:"jobName"`
User string `json:"userName"`
} `json:"org.apache.hadoop.mapreduce.jobhistory.JobSubmitted"`
}
type jobInitedEvent struct {
Ev struct {
ID string `json:"jobid"`
LaunchTime int64 `json:"launchTime"`
TotalMaps int `json:"totalMaps"`
TotalReduces int `json:"totalReduces"`
} `json:"org.apache.hadoop.mapreduce.jobhistory.JobInited"`
}
type jobFinishedEvent struct {
Ev struct {
ID string `json:"jobid"`
FinishTime int64 `json:"finishTime"`
} `json:"org.apache.hadoop.mapreduce.jobhistory.JobFinished"`
}
type jobFailedEvent struct {
Ev struct {
ID string `json:"jobid"`
FinishTime int64 `json:"finishTime"`
Status string `json:"jobStatus"`
} `json:"org.apache.hadoop.mapreduce.jobhistory.JobUnsuccessfulCompletion"`
}
type attemptStartedEvent struct {
Ev attemptEvent `json:"org.apache.hadoop.mapreduce.jobhistory.TaskAttemptStarted"`
}
type mapFinishedEvent struct {
Ev attemptEvent `json:"org.apache.hadoop.mapreduce.jobhistory.MapAttemptFinished"`
}
type reduceFinishedEvent struct {
Ev attemptEvent `json:"org.apache.hadoop.mapreduce.jobhistory.ReduceAttemptFinished"`
}
type taskFailedEvent struct {
Ev attemptEvent `json:"org.apache.hadoop.mapreduce.jobhistory.TaskAttemptUnsuccessfulCompletion"`
}
type attemptEvent struct {
ID string `json:"attemptId"`
Type string `json:"taskType"`
StartTime int64 `json:"startTime"`
FinishTime int64 `json:"finishTime"`
Error string `json:"error"`
Hostname string `json:"hostname"`
Status string `json:"status"`
Counters struct {
Groups []struct {
Name string `json:"name"`
Counts []struct {
Name string `json:"name"`
Value int `json:"value"`
}
} `json:"groups"`
} `json:"counters"`
}
// HdfsJobHistoryClient fetches job history from HDFS
type HdfsJobHistoryClient interface {
updateFromHistoryFile(jt *jobTracker, job *job, full bool) error
}
type hdfsJobHistoryClient struct{}
type jhistParser struct {
job *job
full bool
scanner *bufio.Scanner
attempts map[string]attemptEvent
}
// loadHistFile streams through the jhist file represented by r, and updates
// the given job's details.
func loadHistFile(r io.Reader, job *job, full bool) error {
scanner := bufio.NewScanner(r)
scanner.Scan()
if scanner.Err() != nil {
return scanner.Err()
}
if !bytes.Equal(scanner.Bytes(), jhistHeader) {
return errors.New("invalid Avro-Json header")
}
parser := &jhistParser{
job: job,
full: full,
scanner: scanner,
attempts: make(map[string]attemptEvent),
}
return parser.parse()
}
func (jp *jhistParser) parse() error {
// Reset these so we can count the events.
jp.job.Details.MapsCompleted = 0
jp.job.Details.MapsFailed = 0
jp.job.Details.MapsKilled = 0
jp.job.Details.ReducesCompleted = 0
jp.job.Details.ReducesFailed = 0
jp.job.Details.ReducesKilled = 0
lineNumber := 1
for jp.scanner.Scan() {
lineNumber++
line := bytes.TrimSpace(jp.scanner.Bytes())
if len(line) == 0 {
continue
}
wrapper := histEvent{}
err := json.Unmarshal(line, &wrapper)
if err != nil {
return fmt.Errorf("line %d: %s", lineNumber, err)
}
switch wrapper.Type {
case "JOB_SUBMITTED":
jp.parseJobSubmitted(wrapper.Event)
case "JOB_INITED":
jp.parseJobInited(wrapper.Event)
case "JOB_FINISHED":
jp.parseJobFinished(wrapper.Event)
case "JOB_FAILED":
jp.parseJobFailed(wrapper.Event)
case "MAP_ATTEMPT_STARTED":
jp.parseTaskStarted(wrapper.Event)
case "MAP_ATTEMPT_FINISHED":
jp.job.Details.MapsCompleted++
jp.parseMapFinished(wrapper.Event)
case "MAP_ATTEMPT_FAILED":
jp.job.Details.MapsFailed++
jp.parseTaskFailed(wrapper.Event)
case "MAP_ATTEMPT_KILLED":
jp.job.Details.MapsKilled++
jp.parseTaskFailed(wrapper.Event)
case "REDUCE_ATTEMPT_STARTED":
jp.parseTaskStarted(wrapper.Event)
case "REDUCE_ATTEMPT_FINISHED":
jp.job.Details.ReducesCompleted++
jp.parseReduceFinished(wrapper.Event)
case "REDUCE_ATTEMPT_FAILED":
jp.job.Details.ReducesFailed++
jp.parseTaskFailed(wrapper.Event)
case "REDUCE_ATTEMPT_KILLED":
jp.job.Details.ReducesKilled++
jp.parseTaskFailed(wrapper.Event)
}
lineNumber++
}
if jp.scanner.Err() != nil {
return jp.scanner.Err()
}
if !jp.full {
return nil
}
// Consolidate tasks and counters. We kinda lazily combine the attempts into
// tasks here when trimTasks runs over them. We can't just look at the task
// events, because the historyserver does the same misdirection - it sets
// startTime for the task to the startTime of the first attempt, for example.
tasks := tasks{
Map: make([][]int64, 0),
Reduce: make([][]int64, 0),
Errors: make(map[string][]taskAttempt),
}
counters := make(map[string]counter)
for _, attempt := range jp.attempts {
// Save the task times.
if attempt.Type == "MAP" {
tasks.Map = append(tasks.Map, []int64{attempt.StartTime, attempt.FinishTime})
} else if attempt.Type == "REDUCE" {
tasks.Reduce = append(tasks.Reduce, []int64{attempt.StartTime, attempt.FinishTime})
}
if attempt.Status == "FAILED" && attempt.Error != "" {
if _, exists := tasks.Errors[attempt.Error]; !exists {
tasks.Errors[attempt.Error] = make([]taskAttempt, 0)
}
tasks.Errors[attempt.Error] = append(tasks.Errors[attempt.Error], taskAttempt{
ID: attempt.ID,
Hostname: attempt.Hostname,
Type: attempt.Type,
})
}
// Update any counters from the attempt.
for _, group := range attempt.Counters.Groups {
groupName := group.Name[strings.LastIndex(group.Name, ".")+1:]
for _, count := range group.Counts {
counterName := fmt.Sprintf("%s.%s", groupName, count.Name)
counter := counters[counterName]
counter.Name = counterName
counter.Total += count.Value
if attempt.Type == "MAP" {
counter.Map += count.Value
} else if attempt.Type == "REDUCE" {
counter.Reduce += count.Value
}
counters[counterName] = counter
}
}
}
jp.job.Details.MapsTotalTime = sumTimes(tasks.Map)
jp.job.Details.ReducesTotalTime = sumTimes(tasks.Reduce)
jp.job.Tasks.Map = trimTasks(tasks.Map)
jp.job.Tasks.Reduce = trimTasks(tasks.Reduce)
jp.job.Tasks.Errors = tasks.Errors
for _, counter := range counters {
jp.job.Counters = append(jp.job.Counters, counter)
}
return nil
}
func (jp *jhistParser) parseJobSubmitted(b []byte) {
ev := jobSubmittedEvent{}
json.Unmarshal(b, &ev)
jp.job.Details.ID = ev.Ev.ID
jp.job.Details.Name = ev.Ev.Name
jp.job.Details.User = ev.Ev.User
}
func (jp *jhistParser) parseJobInited(b []byte) {
ev := jobInitedEvent{}
json.Unmarshal(b, &ev)
jp.job.Details.ID = ev.Ev.ID
jp.job.Details.StartTime = ev.Ev.LaunchTime
jp.job.Details.MapsTotal = ev.Ev.TotalMaps
jp.job.Details.ReducesTotal = ev.Ev.TotalReduces
}
func (jp *jhistParser) parseJobFinished(b []byte) {
ev := jobFinishedEvent{}
json.Unmarshal(b, &ev)
jp.job.Details.ID = ev.Ev.ID
jp.job.Details.FinishTime = ev.Ev.FinishTime
jp.job.Details.State = "SUCCEEDED"
}
func (jp *jhistParser) parseJobFailed(b []byte) {
ev := jobFailedEvent{}
json.Unmarshal(b, &ev)
jp.job.Details.ID = ev.Ev.ID
jp.job.Details.FinishTime = ev.Ev.FinishTime
jp.job.Details.State = ev.Ev.Status
}
func (jp *jhistParser) parseTaskStarted(b []byte) {
ev := attemptStartedEvent{}
json.Unmarshal(b, &ev)
jp.attempts[ev.Ev.ID] = ev.Ev
}
func (jp *jhistParser) parseMapFinished(b []byte) {
ev := mapFinishedEvent{}
json.Unmarshal(b, &ev)
startTime := jp.attempts[ev.Ev.ID].StartTime
ev.Ev.StartTime = startTime
jp.attempts[ev.Ev.ID] = ev.Ev
}
func (jp *jhistParser) parseReduceFinished(b []byte) {
ev := reduceFinishedEvent{}
json.Unmarshal(b, &ev)
startTime := jp.attempts[ev.Ev.ID].StartTime
ev.Ev.StartTime = startTime
jp.attempts[ev.Ev.ID] = ev.Ev
}
func (jp *jhistParser) parseTaskFailed(b []byte) {
ev := taskFailedEvent{}
json.Unmarshal(b, &ev)
startTime := jp.attempts[ev.Ev.ID].StartTime
ev.Ev.StartTime = startTime
jp.attempts[ev.Ev.ID] = ev.Ev
}
// findHistoryAndConfFiles locates and returns the .jhist and _conf.xml files for the given
// job.
func findHistoryAndConfFiles(client *hdfs.Client, jobID jobID, finishTime int64) (string, string, error) {
parts := strings.Split(string(jobID), "_")
sort, _ := strconv.ParseInt(parts[len(parts)-1], 10, 0)
t := time.Unix(finishTime/1000, 0)
histPath := fmt.Sprintf("%s/%04d/%02d/%02d/%06d",
*yarnHistoryDir, t.Year(), t.Month(), t.Day(), sort/1000)
infos, err := client.ReadDir(histPath)
if err != nil {
return "", "", err
}
var confFile, histFile string
for _, info := range infos {
if strings.HasPrefix(info.Name(), string(jobID)) {
p := path.Join(histPath, info.Name())
if strings.HasSuffix(p, "conf.xml") {
confFile = p
} else if strings.HasSuffix(p, ".jhist") {
histFile = p
}
if confFile != "" && histFile != "" {
return confFile, histFile, nil
}
}
}
return "", "", fmt.Errorf("no matching files found at %s", histPath)
}
// updateFromHistoryFile updates a job's details by loading its saved 'jhist'
// file stored in hdfs, along with the stored jobconf xml file.
func (jc *hdfsJobHistoryClient) updateFromHistoryFile(jt *jobTracker, job *job, full bool) error {
now := time.Now()
client, err := hdfs.New(jt.jobClient.getNamenodeAddress())
if err != nil {
return err
}
defer client.Close()
_, jobID := hadoopIDs(job.Details.ID)
confFile, histFile, err := findHistoryAndConfFiles(client, jobID, job.Details.FinishTime)
if err != nil {
return fmt.Errorf("couldn't find history file for %s in cluster %s: %s", jobID, jt.clusterName, err)
}
histFileReader, err := client.Open(histFile)
if err != nil {
return fmt.Errorf("couldn't open history file at %s: %s", histFile, err)
}
err = loadHistFile(histFileReader, job, full)
if err != nil {
return fmt.Errorf("couldn't read history file at %s: %s", histFile, err)
}
confFileReader, err := client.Open(confFile)
if err != nil {
return fmt.Errorf("couldn't open jobconf at %s: %s", confFile, err)
}
conf, err := loadConf(confFileReader)
if err != nil {
return fmt.Errorf("couldn't read jobconf at %s: %s", confFile, err)
}
log.Println("Read jobConf and history file for", jobID, "in", time.Now().Sub(now))
job.conf.update(conf)
if full {
job.partial = false
}
return nil
}