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https://issues.apache.org/jira/browse/SPARK-14953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267625#comment-15267625
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Davies Liu commented on SPARK-14953:
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see this one as an reference https://github.com/apache/spark/pull/4147
> LocalBackend should revive offers periodically
> ----------------------------------------------
>
> Key: SPARK-14953
> URL: https://issues.apache.org/jira/browse/SPARK-14953
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Cheng Lian
>
> {{LocalBackend}} only revives offers when tasks are submitted, succeed, or
> fail. This may lead to deadlock due to delayed scheduling. A case study is
> provided in [this PR
> comment|https://github.com/apache/spark/pull/12527#issuecomment-213034425].
> Basically, a job may have a task is delayed to be scheduled due to locality
> mismatch. The default delay timeout is 3s. If all other tasks finish during
> this period, {{LocalBackend}} won't revive any offer after the timeout since
> no tasks are submitted, succeed or fail then. Thus, the delayed task will
> never be scheduled again and the job never completes.
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