Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/18150#discussion_r121228041
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -188,6 +188,12 @@ class DAGScheduler(
private val disallowStageRetryForTest =
sc.getConf.getBoolean("spark.test.noStageRetry", false)
/**
+ * If enabled, fetch failure will cause all the output on that host to
be unregistered.
--- End diff --
Rephrase this by
```
Whether to unregister all the outputs on the host in condition that we
receive a FetchFailure, this is set default to false, which means, we only
unregister the outputs related to the exact executor(instead of the host) on a
FetchFailure.
```
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