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https://issues.apache.org/jira/browse/HADOOP-5499?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas resolved HADOOP-5499.
-----------------------------------
Resolution: Fixed
Fix Version/s: 0.20.0
Fixed in HADOOP-5514
> JobTracker metrics do not match job counters
> --------------------------------------------
>
> Key: HADOOP-5499
> URL: https://issues.apache.org/jira/browse/HADOOP-5499
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred, metrics
> Affects Versions: 0.20.0
> Reporter: Chris Douglas
> Fix For: 0.20.0
>
>
> After one run of a 10 map, 3 reduce sort job, the mapred metrics report:
> {noformat}
> mapred.tasktracker: hostName=snip, sessionId=, mapTaskSlots=3,
> maps_running=0, \
> reduceTaskSlots=3, reduces_running=0, tasks_completed=15,
> tasks_failed_ping=0, tasks_failed_timeout=0
> mapred.jobtracker: hostName=snip, sessionId=, jobs_completed=1,
> jobs_submitted=1, \
> maps_completed=10, maps_launched=12, reduces_completed=3, reduces_launched=3
> {noformat}
> After the second (w/ one manually killed reduce)
> {noformat}
> mapred.tasktracker: hostName=snip, sessionId=, mapTaskSlots=3,
> maps_running=0, \
> reduceTaskSlots=3, reduces_running=0, tasks_completed=32,
> tasks_failed_ping=0, tasks_failed_timeout=0
> mapred.jobtracker: hostName=snip, sessionId=, jobs_completed=2,
> jobs_submitted=2, \
> maps_completed=20, maps_launched=24, reduces_completed=6, reduces_launched=8
> {noformat}
> The counters report the expected 10/3 map/reduce completions, the second job
> reporting a single failure.
> # The {{maps_launched}} and {{reduces_launched}} counts are likely recording
> setup and cleanup tasks as well
> # After being recorded among launched tasks, it looks like setup and cleanup
> are _not_ included among completed tasks
> # {{tasks_completed}} on the TaskTracker should include only user tasks
> # The {{reduces_launched}} count makes little sense to me. With three reduces
> launched per job and one failed, what's the other launched reduce counting?
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