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https://issues.apache.org/jira/browse/MAPREDUCE-7339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mudit Sharma updated MAPREDUCE-7339:
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Description:
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}
{color:#172b4d}Raised PR for the fix:
https://github.com/apache/hadoop/pull/2951{color}
was:
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}
> 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
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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}
>
> {color:#172b4d}Raised PR for the fix:
> https://github.com/apache/hadoop/pull/2951{color}
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