HADOOP-10231. Add some components in Native Libraries document (Akira AJISAKA via aw)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1618059 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -205,6 +205,9 @@ Trunk (Unreleased)
     HADOOP-8944. Shell command fs -count should include human readable option
       (Jonathan Allen via aw)
 
+    HADOOP-10231. Add some components in Native Libraries document (Akira 
+      AJISAKA via aw)
+
   BUG FIXES
 
     HADOOP-9451. Fault single-layer config if node group topology is enabled.

hadoop-common-project/hadoop-common/src/site/apt/NativeLibraries.apt.vm

@@ -30,6 +30,8 @@ Native Libraries Guide
    compression" could refer to all *.so's you need to compile that are
    specifically related to compression. Currently, however, this document
    only addresses the native hadoop library (<<<libhadoop.so>>>).
+   The document for libhdfs library (<<<libhdfs.so>>>) is
+   {{{../hadoop-hdfs/LibHdfs.html}here}}.
 
 * Native Hadoop Library
 
@@ -64,14 +66,16 @@ Native Libraries Guide
 
 * Components
 
-   The native hadoop library includes two components, the zlib and gzip
-   compression codecs:
+   The native hadoop library includes various components:
 
-     * zlib
+   * Compression Codecs (bzip2, lz4, snappy, zlib)
 
-     * gzip
+   * Native IO utilities for {{{../hadoop-hdfs/ShortCircuitLocalReads.html}
+     HDFS Short-Circuit Local Reads}} and
+     {{{../hadoop-hdfs/CentralizedCacheManagement.html}Centralized Cache
+     Management in HDFS}}
 
-   The native hadoop library is imperative for gzip to work.
+   * CRC32 checksum implementation
 
 * Supported Platforms