GitHub user andrewor14 opened a pull request:
https://github.com/apache/spark/pull/3411
[SPARK-4546] Improve HistoryServer first time user experience
The documentation point the user to run the following
```
sbin/start-history-server.sh
```
The first thing this does is throw an exception that complains a log
directory is not specified. Although this is also documented, the exception
message itself does not say anything about what to set. Instead we should have
a default and a landing page with a better message.
This is what it looks like as of this PR:

You can merge this pull request into a Git repository by running:
$ git pull https://github.com/andrewor14/spark minor-history-improvements
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3411.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3411
----
commit fc4c17ab5b3e9560fbd6a1a0c3de66da309410f2
Author: Andrew Or <[email protected]>
Date: 2014-11-21T23:18:57Z
Improve HistoryServer UX
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