PARQUET-2121: Remove descriptions for the removed modules (#947)

* PARQUET-2121: Remove descriptions for the removed modules

* Add '(deprecated)' to removed modules in README.md instead of removing their line

Author: sekikn

.gitignore

@@ -13,7 +13,6 @@ target
 *.orig
 *.rej
 dependency-reduced-pom.xml
-parquet-scrooge/.cache
 .idea/*
 target/
 .cache

README.md

@@ -66,10 +66,10 @@ Parquet is a very active project, and new features are being added quickly. Here
 * Type-specific encoding
 * Hive integration (deprecated)
 * Pig integration
-* Cascading integration
+* Cascading integration (deprecated)
 * Crunch integration
 * Apache Arrow integration
-* Apache Scrooge integration
+* Scrooge integration (deprecated)
 * Impala integration (non-nested)
 * Java Map/Reduce API
 * Native Avro support
@@ -92,7 +92,7 @@ Note that to use an Input or Output format, you need to implement a WriteSupport
 We've implemented this for 2 popular data formats to provide a clean migration path as well:
 
 ### Thrift
-Thrift integration is provided by the [parquet-thrift](https://github.com/apache/parquet-mr/tree/master/parquet-thrift) sub-project. If you are using Thrift through Scala, you may be using Twitter's [Scrooge](https://github.com/twitter/scrooge). If that's the case, not to worry -- we took care of the Scrooge/Apache Thrift glue for you in the [parquet-scrooge](https://github.com/apache/parquet-mr/tree/master/parquet-scrooge) sub-project.
+Thrift integration is provided by the [parquet-thrift](https://github.com/apache/parquet-mr/tree/master/parquet-thrift) sub-project.
 
 ### Avro
 Avro conversion is implemented via the [parquet-avro](https://github.com/apache/parquet-mr/tree/master/parquet-avro) sub-project.

parquet-thrift/src/main/java/org/apache/parquet/hadoop/thrift/ThriftReadSupport.java

@@ -67,8 +67,7 @@ public class ThriftReadSupport<T> extends ReadSupport<T> {
   /**
    * A {@link ThriftRecordConverter} builds an object by working with {@link TProtocol}. The default
    * implementation creates standard Apache Thrift {@link TBase} objects; to support alternatives, such
-   * as <a href="https://github.com/twitter/scrooge">Twiter's Scrooge</a>, a custom converter can be specified using this key
-   * (for example, ScroogeRecordConverter from parquet-scrooge).
+   * as <a href="https://github.com/twitter/scrooge">Twiter's Scrooge</a>, a custom converter can be specified using this key.
    */
   private static final String RECORD_CONVERTER_CLASS_KEY = "parquet.thrift.converter.class";
 
@@ -77,8 +76,7 @@ public class ThriftReadSupport<T> extends ReadSupport<T> {
   /**
    * A {@link ThriftRecordConverter} builds an object by working with {@link TProtocol}. The default
    * implementation creates standard Apache Thrift {@link TBase} objects; to support alternatives, such
-   * as <a href="https://github.com/twitter/scrooge">Twiter's Scrooge</a>, a custom converter can be specified
-   * (for example, ScroogeRecordConverter from parquet-scrooge).
+   * as <a href="https://github.com/twitter/scrooge">Twiter's Scrooge</a>, a custom converter can be specified.
    *
    * @param conf a mapred jobconf
    * @param klass a thrift class
@@ -93,8 +91,7 @@ public static void setRecordConverterClass(JobConf conf,
   /**
    * A {@link ThriftRecordConverter} builds an object by working with {@link TProtocol}. The default
    * implementation creates standard Apache Thrift {@link TBase} objects; to support alternatives, such
-   * as <a href="https://github.com/twitter/scrooge">Twiter's Scrooge</a>, a custom converter can be specified
-   * (for example, ScroogeRecordConverter from parquet-scrooge).
+   * as <a href="https://github.com/twitter/scrooge">Twiter's Scrooge</a>, a custom converter can be specified.
    *
    * @param conf a configuration
    * @param klass a thrift class

parquet_cascading.md

@@ -77,8 +77,6 @@
     <japicmp.version>0.14.2</japicmp.version>
     <shade.prefix>shaded.parquet</shade.prefix>
     <hadoop.version>2.10.1</hadoop.version>
-    <cascading.version>2.7.1</cascading.version>
-    <cascading3.version>3.1.2</cascading3.version>
     <parquet.format.version>2.9.0</parquet.format.version>
     <previous.version>1.12.0</previous.version>
     <thrift.executable>thrift</thrift.executable>
@@ -461,7 +459,6 @@
             <exclude>**/*.parquet</exclude>
             <exclude>**/*.avro</exclude>
             <exclude>**/*.json</exclude>
-            <exclude>**/names.txt</exclude> <!-- parquet-cascading test data -->
             <exclude>**/*.avsc</exclude>
             <exclude>**/*.iml</exclude>
             <exclude>**/*.log</exclude>