Saisai Shao created SPARK-20517:
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             Summary: Download link in history server UI is not correct
                 Key: SPARK-20517
                 URL: https://issues.apache.org/jira/browse/SPARK-20517
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.1.0, 2.2.0
            Reporter: Saisai Shao
            Priority: Minor


The download link in history server UI is concatenated with:

{code}
      <td><a href="{{uiroot}}/api/v1/applications/{{id}}/{{num}}/logs" 
class="btn btn-info btn-mini">Download</a></td>
{code}

Here {{num}} filed represents number of attempts, this is equal to REST APIs. 
In the REST API, if attempt id is not existed, then {{num}} field should be 
empty, otherwise this {{num}} field should actually be {{attemptId}}.

This will lead to the issue of "no such app", rather than correctly download 
the event log.



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