clean up for extensions docs

docs/content/development/extensions-contrib/azure.md

@@ -4,6 +4,8 @@ layout: doc_page
 
 # Microsoft Azure
 
+To use this extension, make sure to [include](../../operations/including-extensions.html) `druid-azure-extensions` extension.
+
 ## Deep Storage
 
 [Microsoft Azure Storage](http://azure.microsoft.com/en-us/services/storage/) is another option for deep storage. This requires some additional druid configuration.

docs/content/development/extensions-contrib/cassandra.md

@@ -4,6 +4,8 @@ layout: doc_page
 
 # Apache Cassandra
 
+To use this extension, make sure to [include](../../operations/including-extensions.html) `druid-cassandra-storage` extension.
+
 [Apache Cassandra](http://www.datastax.com/what-we-offer/products-services/datastax-enterprise/apache-cassandra) can also 
 be leveraged for deep storage.  This requires some additional druid configuration as well as setting up the necessary 
 schema within a Cassandra keystore.

docs/content/development/extensions-contrib/distinctcount.md

@@ -4,6 +4,10 @@ layout: doc_page
 
 # DistinctCount aggregator
 
+To use this extension, make sure to [include](../../operations/including-extensions.html) `druid-distinctcount` extension.
+
+Additionally, follow these steps:
+
 (1) First use single dimension hash-based partitioning to partition data by a dimension for example visitor_id, this to make sure all rows with a particular value for that dimension will go into the same segment or this might over count.
 (2) Second use distinctCount to calculate exact distinct count, make sure queryGranularity is divide exactly by segmentGranularity or else the result will be wrong.
 There is some limitations, when use with groupBy, the groupBy keys' numbers should not exceed maxIntermediateRows in every segment, if exceed the result will wrong. And when use with topN, numValuesPerPass should not too big, if too big the distinctCount will use many memory and cause the JVM out of service.

docs/content/development/extensions-contrib/graphite.md

@@ -4,6 +4,8 @@ layout: doc_page
 
 # Graphite Emitter
 
+To use this extension, make sure to [include](../../operations/including-extensions.html) `graphite-emitter` extension.
+
 ## Introduction
 
 This extension emits druid metrics to a graphite carbon server.

docs/content/development/extensions-contrib/kafka-simple.md

@@ -4,6 +4,8 @@ layout: doc_page
 
 # Kafka Simple Consumer
 
+To use this extension, make sure to [include](../../operations/including-extensions.html) `druid-kafka-eight-simpleConsumer` extension.
+
 ## Firehose
 
 This is an experimental firehose to ingest data from kafka using kafka simple consumer api. Currently, this firehose would only work inside standalone realtime nodes.

docs/content/development/extensions-contrib/parquet.md

@@ -1,5 +1,11 @@
+---
+layout: doc_page
+---
+
 # Parquet
 
+To use this extension, make sure to [include](../../operations/including-extensions.html) `druid-avro-extensions` and `druid-parquet-extensions`.
+
 This extension enables Druid to ingest and understand the Apache Parquet data format offline.
 
 ## Parquet Hadoop Parser

docs/content/development/extensions-contrib/rabbitmq.md

@@ -4,6 +4,8 @@ layout: doc_page
 
 # RabbitMQ
 
+To use this extension, make sure to [include](../../operations/including-extensions.html) `druid-rabbitmq` extension.
+
 ## Firehose
 
 #### RabbitMQFirehose

docs/content/development/extensions-contrib/rocketmq.md

@@ -4,4 +4,6 @@ layout: doc_page
 
 # RocketMQ
 
+To use this extension, make sure to [include](../../operations/including-extensions.html) `druid-rocketmq` extension.
+
 Original author: [https://github.com/lizhanhui](https://github.com/lizhanhui).

docs/content/development/extensions.md

@@ -45,7 +45,7 @@ If you'd like to take on maintenance for a community extension, please post on [
 |druid-cloudfiles-extensions|Rackspace Cloudfiles deep storage and firehose.|[link](../development/extensions-contrib/cloudfiles.html)|
 |druid-distinctcount|DistinctCount aggregator|[link](../development/extensions-contrib/distinctcount.html)|
 |druid-kafka-eight-simpleConsumer|Kafka ingest firehose (low level consumer).|[link](../development/extensions-contrib/kafka-simple.html)|
-|druid-parquet-extensions|Support for data in Apache Parquet data format.|[link](../development/extensions-contrib/parquet.html)|
+|druid-parquet-extensions|Support for data in Apache Parquet data format. Requires druid-avro-extensions to be loaded.|[link](../development/extensions-contrib/parquet.html)|
 |druid-rabbitmq|RabbitMQ firehose.|[link](../development/extensions-contrib/rabbitmq.html)|
 |druid-rocketmq|RocketMQ firehose.|[link](../development/extensions-contrib/rocketmq.html)|
 |graphite-emitter|Graphite metrics emitter|[link](../development/extensions-contrib/graphite.html)|