Wenchen Fan created SPARK-25341:
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Summary: Support rolling back a shuffle map stage and re-generate
the shuffle files
Key: SPARK-25341
URL: https://issues.apache.org/jira/browse/SPARK-25341
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.4.0
Reporter: Wenchen Fan
This is a follow up of https://issues.apache.org/jira/browse/SPARK-23243
To completely fix that problem, Spark needs to be able to rollback a shuffle
map stage and rerun all the map tasks.
According to https://github.com/apache/spark/pull/9214 , Spark doesn't support
it currently, as in shuffle writing "first write wins".
Since overwriting shuffle files is hard, we can extend the shuffle id to
include a "shuffle generation number". Then the reduce task can specify which
generation of shuffle it wants to read.
https://github.com/apache/spark/pull/6648 seems in the right direction.
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