wuyi created SPARK-24021:
----------------------------
Summary: Fix bug in BlacklistTracker's
updateBlacklistForFetchFailure
Key: SPARK-24021
URL: https://issues.apache.org/jira/browse/SPARK-24021
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 2.3.0
Reporter: wuyi
There‘s a miswrite in BlacklistTracker's updateBlacklistForFetchFailure:
```
val blacklistedExecsOnNode =
nodeToBlacklistedExecs.getOrElseUpdate(exec, HashSet[String]())
blacklistedExecsOnNode += exec
```
where first **exec** should be **host**.
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