317brian commented on code in PR #18286:
URL: https://github.com/apache/druid/pull/18286#discussion_r2263627730


##########
docs/operations/other-hadoop.md:
##########
@@ -23,6 +23,14 @@ title: "Working with different versions of Apache Hadoop"
   -->
 
 
+:::caution[Deprecated]
+
+Hadoop-based ingestion is deprecated. Use [SQL-based 
ingestion](../multi-stage-query/index.md) instead of MapReduce or 
[MiddleManager-less ingestion using 
Kubernetes](../development/extensions-core/k8s-jobs.md) instead of YARN.
+
+You must now explicitly opt-in to using the deprecated `index_hadoop` task 
type. To opt-in, set `druid.indexer.task.allowHadoopTaskExecution` to `true` in 
your `common.runtime.properties` file. For more information, see 
[#18239](https://github.com/apache/druid/pull/18239)

Review Comment:
   ```suggestion
   Hadoop-based ingestion is deprecated. We recommend one of Druid's other 
supported ingestion patterns, such as [SQL-based 
ingestion](../multi-stage-query/index.md) or [MiddleManager-less ingestion 
using Kubernetes](../development/extensions-core/k8s-jobs.md)
   
   You must now explicitly opt-in to using the deprecated `index_hadoop` task 
type. To opt-in, set `druid.indexer.task.allowHadoopTaskExecution` to `true` in 
your `common.runtime.properties` file. For more information, see 
[#18239](https://github.com/apache/druid/pull/18239)
   ```



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