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“attilapiros” 1dc2c1d5e8 [SPARK-23413][UI] Fix sorting tasks by Host / Executor ID at the Stage page 
## What changes were proposed in this pull request?

Fixing exception got at sorting tasks by Host / Executor ID:
```
        java.lang.IllegalArgumentException: Invalid sort column: Host
	at org.apache.spark.ui.jobs.ApiHelper$.indexName(StagePage.scala:1017)
	at org.apache.spark.ui.jobs.TaskDataSource.sliceData(StagePage.scala:694)
	at org.apache.spark.ui.PagedDataSource.pageData(PagedTable.scala:61)
	at org.apache.spark.ui.PagedTable$class.table(PagedTable.scala:96)
	at org.apache.spark.ui.jobs.TaskPagedTable.table(StagePage.scala:708)
	at org.apache.spark.ui.jobs.StagePage.liftedTree1$1(StagePage.scala:293)
	at org.apache.spark.ui.jobs.StagePage.render(StagePage.scala:282)
	at org.apache.spark.ui.WebUI$$anonfun$2.apply(WebUI.scala:82)
	at org.apache.spark.ui.WebUI$$anonfun$2.apply(WebUI.scala:82)
	at org.apache.spark.ui.JettyUtils$$anon$3.doGet(JettyUtils.scala:90)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.spark_project.jetty.servlet.ServletHolder.handle(ServletHolder.java:848)
	at org.spark_project.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:584)
```

Moreover some refactoring to avoid similar problems by introducing constants for each header name and reusing them at the identification of the corresponding sorting index.

## How was this patch tested?

Manually:

![screen shot 2018-02-13 at 18 57 10](https://user-images.githubusercontent.com/2017933/36166532-1cfdf3b8-10f3-11e8-8d32-5fcaad2af214.png)

Author: “attilapiros” <piros.attila.zsolt@gmail.com>

Closes #20601 from attilapiros/SPARK-23413.
2018-02-15 13:51:24 -06:00
..
src [SPARK-23413][UI] Fix sorting tasks by Host / Executor ID at the Stage page 2018-02-15 13:51:24 -06:00
pom.xml [SPARK-23028] Bump master branch version to 2.4.0-SNAPSHOT 2018-01-13 00:37:59 +08:00