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Posted to mapreduce-issues@hadoop.apache.org by "Mudit Sharma (Jira)" <ji...@apache.org> on 2021/04/24 05:26:00 UTC
[jira] [Updated] (MAPREDUCE-7339) Default Speculator returns
speculationValue as TOO_LATE_TO_SPECULATE or PROGRESS_IS_GOOD even if the
task is ALREADY_SPECULATING
[ https://issues.apache.org/jira/browse/MAPREDUCE-7339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mudit Sharma updated MAPREDUCE-7339:
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Summary: Default Speculator returns speculationValue as TOO_LATE_TO_SPECULATE or PROGRESS_IS_GOOD even if the task is ALREADY_SPECULATING (was: Default Speculatoor returns speculationValue as TOO_LATE_TO_SPECULATE or PROGRESS_IS_GOOD eve if the task is ALREADY_SPECULATING)
> Default Speculator returns speculationValue as TOO_LATE_TO_SPECULATE or PROGRESS_IS_GOOD even if the task is ALREADY_SPECULATING
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-7339
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7339
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Mudit Sharma
> Priority: Major
>
> DefaultSpeculator implementation in Mapreduce returns some MAGIC numbers in speculationValue if the tasks is not a good candidate for speculation. It returns these values:
>
> {noformat}
> returns ALREADY_SPECULATING if that is true. This has priority.
> returns TOO_NEW if our companion task hasn't gotten any information
> returns PROGRESS_IS_GOOD if the task is sailing through
> returns NOT_RUNNING if the task is not running{noformat}
>
>
> {color:#172b4d}But there is one bug, due to which even if task is speculating, but if its progress is good or its too late to speculate, code returns TOO_LATE_TO_SPECULATE or PROGRESS_IS_GOOD and not ALREADY_SPECULATING{color}
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