Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/10821#issuecomment-190551333
@steveloughran , here "1" is the number of attempts
[here](https://github.com/apache/spark/blob/master/core/src/main/resources/org/apache/spark/ui/static/historypage.js#L126),
and it used to generate a URL
[here](https://github.com/apache/spark/blob/master/core/src/main/resources/org/apache/spark/ui/static/historypage-template.html#L67).
Also in the yarn code, this "1" or "2" is gotten from [attempt
id](https://github.com/apache/spark/blob/master/yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala#L276).
This "1" or "2" as attempt id to concatenate the URL is not accessable in
my local test.
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