[GitHub] [incubator-druid] jihoonson opened a new pull request #8190: Teach tasks what machine they are running on

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jihoonson opened a new pull request #8190: Teach tasks what machine they are running on
URL: https://github.com/apache/incubator-druid/pull/8190
 
 
   Part of https://github.com/apache/incubator-druid/issues/8061.
   
   ### Description
   
   In parallel native indexing, the middleManager is responsible for serving intermediary data for shuffle. As a result, the phase 2 tasks need to know where phase 1 tasks ran.
   
   This PR lets tasks know where they are running by adding new system properties. This is supposed to be used for only internal purpose and so doesn't have to be documented.
   
   <hr>
   
   This PR has:
   - [x] been self-reviewed.
   - [x] added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
   - [x] been tested in a test Druid cluster.

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