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https://issues.apache.org/jira/browse/SPARK-19293?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen reopened SPARK-19293:
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> Spark 2.1.x unstable with spark.speculation=true
> ------------------------------------------------
>
> Key: SPARK-19293
> URL: https://issues.apache.org/jira/browse/SPARK-19293
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.0, 2.1.1
> Reporter: Damian Momot
> Priority: Critical
>
> After upgrading from Spark 2.0.2 to 2.1.0 we've observed that jobs are often
> failing when speculative mode is enabled.
> In 2.0.2 speculative tasks were simply skipped if they were not used for
> result (i.e. other instance finished earlier) - and it was clearly visible in
> UI that those tasks were not counted as failures.
> In 2.1.0 many tasks are being marked failed/killed when speculative tasks
> start to run (that is at the end of stage when there are spare executors to
> use) which also leads to entire stage/job failures.
> Disabling spark.speculation solves failing problem - but speculative mode is
> very useful especially when different executors run on machines with varying
> load (for example in YARN)
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