[GitHub] [incubator-druid] jon-wei commented on a change in pull request #8982: Add DruidInputSource (replacement for IngestSegmentFirehose)

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jon-wei commented on a change in pull request #8982: Add DruidInputSource (replacement for IngestSegmentFirehose)
URL: https://github.com/apache/incubator-druid/pull/8982#discussion_r354137196
 
 

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 File path: docs/ingestion/native-batch.md
 ##########
 @@ -890,3 +890,31 @@ This Firehose can be used to combine and merge data from a list of different Fir
 |--------|-----------|---------|
 |type|This should be "combining"|yes|
 |delegates|List of Firehoses to combine data from|yes|
+
+
+## Input Sources
+
+### DruidInputSource
+
+This InputSource can be used to read data from existing Druid segments, potentially using a new schema and changing the name, dimensions, metrics, rollup, etc. of the segment.
+This InputSource is _splittable_ and can be used by [native parallel index tasks](native-batch.md#parallel-task).
+This InputSource has a fixed InputFormat for reading from Druid segments; no InputFormat needs to be specified in the ingestion spec when using this InputSource.
+
+A sample DruidInputSource spec is shown below:
+
+```json
+{
+    "type": "druid",
+    "dataSource": "wikipedia",
+    "interval": "2013-01-01/2013-01-02"
 
 Review comment:
   Added a second example with more explanation of what the example specs do

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