Cheng Lian created SPARK-14953:
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Summary: 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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