Yuchen Feng created SPARK-31373:
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Summary: Cluster tried to fetch blocks from blacklisted node of
previous stage
Key: SPARK-31373
URL: https://issues.apache.org/jira/browse/SPARK-31373
Project: Spark
Issue Type: Bug
Components: Block Manager
Affects Versions: 2.4.2
Reporter: Yuchen Feng
We enabled blacklist on our Spark application but recently we saw some wierd
issue.
Our code is like
rdd.repartitions(...).mapPartitions(...).groupByKey(...).map().collect()
{{}}In mapPartitions stage, some executors has exception "Can't connect to host
xxxxxx: Connection rest by peer" and tasks on them were failed, so all
executors under this node were blacklisted, as well as this node. These
executors did complete some tasks before blacklisted.
Then in next stage (groupByKey(...).map()), application failed with fetch
failure: IndexOutOfBound Exception when some healthy executor want to fetch
block from one of above blacklisted executors.
It happened multiple times.
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