Update `groupId` for delta-lake and iceberg extensions (#15843)

* Update the group id to org.apache.druid.extensions.contrib for contrib exts.

* Note iceberg and delta lake extensions in extensions.md

* properties and shell backticks

* Update groupId in distribution/pom.xml

* remove delta-lake from dist.

* Add note on downloading extension.

distribution/pom.xml

@@ -257,8 +257,6 @@
                                         <argument>org.apache.druid.extensions:druid-kubernetes-extensions</argument>
                                         <argument>-c</argument>
                                         <argument>org.apache.druid.extensions:druid-catalog</argument>
-                                        <argument>-c</argument>
-                                        <argument>org.apache.druid.extensions:druid-deltalake-extensions</argument>
                                         <argument>${druid.distribution.pulldeps.opts}</argument>
                                     </arguments>
                                 </configuration>
@@ -453,9 +451,9 @@
                                         <argument>-c</argument>
                                         <argument>org.apache.druid.extensions.contrib:opentelemetry-emitter</argument>
                                         <argument>-c</argument>
-                                        <argument>org.apache.druid.extensions:druid-iceberg-extensions</argument>
+                                        <argument>org.apache.druid.extensions.contrib:druid-iceberg-extensions</argument>
                                         <argument>-c</argument>
-                                        <argument>org.apache.druid.extensions:druid-deltalake-extensions</argument>
+                                        <argument>org.apache.druid.extensions.contrib:druid-deltalake-extensions</argument>
                                         <argument>-c</argument>
                                         <argument>org.apache.druid.extensions.contrib:druid-spectator-histogram</argument>
                                     </arguments>

docs/configuration/extensions.md

@@ -84,7 +84,9 @@ All of these community extensions can be downloaded using [pull-deps](../operati
 |druid-cloudfiles-extensions|Rackspace Cloudfiles deep storage and firehose.|[link](../development/extensions-contrib/cloudfiles.md)|
 |druid-compressed-bigdecimal|Compressed Big Decimal Type | [link](../development/extensions-contrib/compressed-big-decimal.md)|
 |druid-ddsketch|Support for DDSketch approximate quantiles based on [DDSketch](https://github.com/datadog/sketches-java) | [link](../development/extensions-contrib/ddsketch-quantiles.md)|
+|druid-deltalake-extensions|Support for ingesting Delta Lake tables.|[link](../development/extensions-contrib/delta-lake.md)|
 |druid-distinctcount|DistinctCount aggregator|[link](../development/extensions-contrib/distinctcount.md)|
+|druid-iceberg-extensions|Support for ingesting Iceberg tables.|[link](../development/extensions-contrib/iceberg.md)|
 |druid-redis-cache|A cache implementation for Druid based on Redis.|[link](../development/extensions-contrib/redis-cache.md)|
 |druid-time-min-max|Min/Max aggregator for timestamp.|[link](../development/extensions-contrib/time-min-max.md)|
 |sqlserver-metadata-storage|Microsoft SQLServer deep storage.|[link](../development/extensions-contrib/sqlserver.md)|
@@ -121,7 +123,7 @@ can load bundled extensions by adding their names to your common.runtime.propert
 `druid.extensions.loadList` property. For example, to load the postgresql-metadata-storage and
 druid-hdfs-storage extensions, use the configuration:
 
-```
+```properties
 druid.extensions.loadList=["postgresql-metadata-storage", "druid-hdfs-storage"]
 ```
 
@@ -146,7 +148,7 @@ if they are available from Maven, the included [pull-deps](../operations/pull-de
 specify the full Maven coordinate of the extension in the form `groupId:artifactId:version`. For example,
 for the (hypothetical) extension *com.example:druid-example-extension:1.0.0*, run:
 
-```
+```shell
 java \
   -cp "lib/*" \
   -Ddruid.extensions.directory="extensions" \

docs/development/extensions-contrib/delta-lake.md

@@ -38,6 +38,23 @@ These Delta Lake files are versioned Parquet files.
 The Delta Lake extension uses the Delta Kernel introduced in Delta Lake 3.0.0, which is compatible with Apache Spark 3.5.x.
 Older versions are unsupported, so consider upgrading to Delta Lake 3.0.x or higher to use this extension.
 
+## Downloading Delta Lake extension
+
+To download `druid-deltalake-extensions`, run the following command after replacing `<VERSION>` with the desired
+Druid version:
+
+```shell
+java \
+  -cp "lib/*" \
+  -Ddruid.extensions.directory="extensions" \
+  -Ddruid.extensions.hadoopDependenciesDir="hadoop-dependencies" \
+  org.apache.druid.cli.Main tools pull-deps \
+  --no-default-hadoop \
+  -c "org.apache.druid.extensions.contrib:druid-deltalake-extensions:<VERSION>"
+```
+
+See [Loading community extensions](../../configuration/extensions.md#loading-community-extensions) for more information.
+
 ## Known limitations
 
 - This extension relies on the Delta Kernel API and can only read from the latest Delta table snapshot.

docs/development/extensions-contrib/iceberg.md

@@ -107,6 +107,23 @@ Since the Hadoop AWS connector uses the `s3a` filesystem client, specify the war
 The local catalog type can be used for catalogs configured on the local filesystem. Set the `icebergCatalog` type to `local`. You can use this catalog for demos or localized tests. It is not recommended for production use cases.
 The `warehouseSource` is set to `local` because this catalog only supports reading from a local filesystem.
 
+## Downloading Iceberg extension
+
+To download `druid-iceberg-extensions`, run the following command after replacing `<VERSION>` with the desired
+Druid version:
+
+```shell
+java \
+  -cp "lib/*" \
+  -Ddruid.extensions.directory="extensions" \
+  -Ddruid.extensions.hadoopDependenciesDir="hadoop-dependencies" \
+  org.apache.druid.cli.Main tools pull-deps \
+  --no-default-hadoop \
+  -c "org.apache.druid.extensions.contrib:druid-iceberg-extensions:<VERSION>"
+```
+
+See [Loading community extensions](../../configuration/extensions.md#loading-community-extensions) for more information.
+
 ## Known limitations
 
 This section lists the known limitations that apply to the Iceberg extension.

extensions-contrib/druid-deltalake-extensions/pom.xml

@@ -21,7 +21,7 @@
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
-  <groupId>org.apache.druid.extensions</groupId>
+  <groupId>org.apache.druid.extensions.contrib</groupId>
   <artifactId>druid-deltalake-extensions</artifactId>
   <name>druid-deltalake-extensions</name>
   <description>Delta Lake connector for Druid</description>

extensions-contrib/druid-iceberg-extensions/pom.xml

@@ -21,7 +21,7 @@
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
-  <groupId>org.apache.druid.extensions</groupId>
+  <groupId>org.apache.druid.extensions.contrib</groupId>
   <artifactId>druid-iceberg-extensions</artifactId>
   <name>druid-iceberg-extensions</name>
   <description>druid-iceberg-extensions</description>