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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HADOOP-5499) JobTracker metrics do not match job counters
Date Wed, 18 Mar 2009 07:11:50 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5499?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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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