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Commit 1f6b0b12 authored by zsxwing's avatar zsxwing Committed by Tathagata Das
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[SPARK-8701] [STREAMING] [WEBUI] Add input metadata in the batch page

This PR adds `metadata` to `InputInfo`. `InputDStream` can report its metadata for a batch and it will be shown in the batch page.

For example,

![screen shot](https://cloud.githubusercontent.com/assets/1000778/8403741/d6ffc7e2-1e79-11e5-9888-c78c1575123a.png)

FileInputDStream will display the new files for a batch, and DirectKafkaInputDStream will display its offset ranges.

Author: zsxwing <zsxwing@gmail.com>

Closes #7081 from zsxwing/input-metadata and squashes the following commits:

f7abd9b [zsxwing] Revert the space changes in project/MimaExcludes.scala
d906209 [zsxwing] Merge branch 'master' into input-metadata
74762da [zsxwing] Fix MiMa tests
7903e33 [zsxwing] Merge branch 'master' into input-metadata
450a46c [zsxwing] Address comments
1d94582 [zsxwing] Raname InputInfo to StreamInputInfo and change "metadata" to Map[String, Any]
d496ae9 [zsxwing] Add input metadata in the batch page
parent c4830598
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