[Hadoop Wiki] Update of "Roadmap" by VinodKumarVavilapalli

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The "Roadmap" page has been changed by VinodKumarVavilapalli:
https://wiki.apache.org/hadoop/Roadmap?action=diff&rev1=56&rev2=57

Comment:
Moving Erasure Codes Feature to 2.9.

  For more details on how releases are created, see HowToRelease.
  
  == Hadoop 3.x Releases ==
- 
  === hadoop-3.0 ===
   * HADOOP
    * Move to JDK8+
@@ -47, +46 @@

    * Shell script rewrite [[https://issues.apache.org/jira/browse/HADOOP-9902|HADOOP-9902]]
   * HDFS
    * Removal of hftp in favor of webhdfs [[https://issues.apache.org/jira/browse/HDFS-5570|HDFS-5570]]
+  * YARN
+  * MAPREDUCE
+   * Derive heap size or mapreduce.*.memory.mb automatically [[https://issues.apache.org/jira/browse/MAPREDUCE-5785|MAPREDUCE-5785]]
+ 
+ == Hadoop 2.x Releases ==
+ === hadoop-2.9 ===
+  * HADOOP
+  * HDFS
    * Support for Erasure Codes in HDFS [[https://issues.apache.org/jira/browse/HDFS-7285|HDFS-7285]]
   * YARN
   * MAPREDUCE
-    * Derive heap size or mapreduce.*.memory.mb automatically [[https://issues.apache.org/jira/browse/MAPREDUCE-5785|MAPREDUCE-5785]]
- 
- == Hadoop 2.x Releases ==
  
  === hadoop-2.8 ===
   * HADOOP
@@ -71, +75 @@

    * Move to JDK7+ [[https://issues.apache.org/jira/browse/HADOOP-10530|HADOOP-10530]]
    * Support JDK8 in Hadoop [[https://issues.apache.org/jira/browse/HADOOP-11090|HADOOP-11090]]
   * HDFS
- 
    * Removal of old Web UI [[https://issues.apache.org/jira/browse/HDFS-6252|HDFS-6252]]
   * YARN
-    * Support disk as a resource in YARN for scheduling and isolation [[https://issues.apache.org/jira/browse/YARN-2139|YARN-2139]] 
+   * Support disk as a resource in YARN for scheduling and isolation [[https://issues.apache.org/jira/browse/YARN-2139|YARN-2139]]
-    * Dynamic Resource Configuration [[https://issues.apache.org/jira/browse/YARN-291|YARN-291]]
+   * Dynamic Resource Configuration [[https://issues.apache.org/jira/browse/YARN-291|YARN-291]]
-    * Support NodeGroup layer topology on YARN [[https://issues.apache.org/jira/browse/YARN-18|YARN-18]]
+   * Support NodeGroup layer topology on YARN [[https://issues.apache.org/jira/browse/YARN-18|YARN-18]]
   * MAPREDUCE
  
  === hadoop-2.6 ===
@@ -84, +87 @@

    * Credential provider [[https://issues.apache.org/jira/browse/HADOOP-10607|HADOOP-10607]]
    * Key management server [[https://issues.apache.org/jira/browse/HADOOP-10433|HADOOP-10433]]
   * HDFS
-   * Heterogeneous storage (Phase 2) 
+   * Heterogeneous storage (Phase 2)
     * Support APIs for using storage tiers by the applications [[https://issues.apache.org/jira/browse/HDFS-5682|HDFS-5682]]
     * Memory as storage tier [[https://issues.apache.org/jira/browse/HDFS-5851|HDFS-5851]]
     * SSD storage tier [[https://issues.apache.org/jira/browse/HDFS-7228|HDFS-7228]]