diff --git a/hadoop-common-project/hadoop-common/pom.xml b/hadoop-common-project/hadoop-common/pom.xml
index 7e49a2ff21c..e346c3cd2c3 100644
--- a/hadoop-common-project/hadoop-common/pom.xml
+++ b/hadoop-common-project/hadoop-common/pom.xml
@@ -371,6 +371,11 @@
       <artifactId>snappy-java</artifactId>
       <scope>compile</scope>
     </dependency>
+    <dependency>
+      <groupId>org.lz4</groupId>
+      <artifactId>lz4-java</artifactId>
+      <scope>provided</scope>
+    </dependency>
   </dependencies>
 
   <build>
@@ -577,11 +582,6 @@
             <exclude>src/main/native/m4/*</exclude>
             <exclude>src/test/empty-file</exclude>
             <exclude>src/test/all-tests</exclude>
-            <exclude>src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.h</exclude>
-            <exclude>src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.c</exclude>
-            <exclude>src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h</exclude>
-            <exclude>src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.c</exclude>
-            <exclude>src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc_encoder.h</exclude>
             <exclude>src/main/native/gtest/**/*</exclude>
             <exclude>src/test/resources/test-untar.tgz</exclude>
             <exclude>src/test/resources/test.har/_SUCCESS</exclude>
diff --git a/hadoop-common-project/hadoop-common/src/CMakeLists.txt b/hadoop-common-project/hadoop-common/src/CMakeLists.txt
index 71c950b7f12..d2ef03645a4 100644
--- a/hadoop-common-project/hadoop-common/src/CMakeLists.txt
+++ b/hadoop-common-project/hadoop-common/src/CMakeLists.txt
@@ -236,10 +236,6 @@ configure_file(${CMAKE_SOURCE_DIR}/config.h.cmake ${CMAKE_BINARY_DIR}/config.h)
 set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
 hadoop_add_dual_library(hadoop
     main/native/src/exception.c
-    ${SRC}/io/compress/lz4/Lz4Compressor.c
-    ${SRC}/io/compress/lz4/Lz4Decompressor.c
-    ${SRC}/io/compress/lz4/lz4.c
-    ${SRC}/io/compress/lz4/lz4hc.c
     ${ISAL_SOURCE_FILES}
     ${ZSTD_SOURCE_FILES}
     ${OPENSSL_SOURCE_FILES}
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/Lz4Codec.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/Lz4Codec.java
index ba6b4871505..8bfb7fe95c4 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/Lz4Codec.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/Lz4Codec.java
@@ -27,17 +27,12 @@
 import org.apache.hadoop.io.compress.lz4.Lz4Compressor;
 import org.apache.hadoop.io.compress.lz4.Lz4Decompressor;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
-import org.apache.hadoop.util.NativeCodeLoader;
 
 /**
  * This class creates lz4 compressors/decompressors.
  */
 public class Lz4Codec implements Configurable, CompressionCodec {
 
-  static {
-    NativeCodeLoader.isNativeCodeLoaded();
-  }
-
   Configuration conf;
 
   /**
@@ -60,19 +55,6 @@ public Configuration getConf() {
     return conf;
   }
 
-  /**
-   * Are the native lz4 libraries loaded &amp; initialized?
-   *
-   * @return true if loaded &amp; initialized, otherwise false
-   */
-  public static boolean isNativeCodeLoaded() {
-    return NativeCodeLoader.isNativeCodeLoaded();
-  }
-
-  public static String getLibraryName() {
-    return Lz4Compressor.getLibraryName();
-  }
-
   /**
    * Create a {@link CompressionOutputStream} that will write to the given
    * {@link OutputStream}.
@@ -101,9 +83,6 @@ public CompressionOutputStream createOutputStream(OutputStream out)
   public CompressionOutputStream createOutputStream(OutputStream out,
                                                     Compressor compressor)
       throws IOException {
-    if (!isNativeCodeLoaded()) {
-      throw new RuntimeException("native lz4 library not available");
-    }
     int bufferSize = conf.getInt(
         CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_KEY,
         CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_DEFAULT);
@@ -121,10 +100,6 @@ public CompressionOutputStream createOutputStream(OutputStream out,
    */
   @Override
   public Class<? extends Compressor> getCompressorType() {
-    if (!isNativeCodeLoaded()) {
-      throw new RuntimeException("native lz4 library not available");
-    }
-
     return Lz4Compressor.class;
   }
 
@@ -135,9 +110,6 @@ public Class<? extends Compressor> getCompressorType() {
    */
   @Override
   public Compressor createCompressor() {
-    if (!isNativeCodeLoaded()) {
-      throw new RuntimeException("native lz4 library not available");
-    }
     int bufferSize = conf.getInt(
         CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_KEY,
         CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_DEFAULT);
@@ -175,10 +147,6 @@ public CompressionInputStream createInputStream(InputStream in)
   public CompressionInputStream createInputStream(InputStream in,
                                                   Decompressor decompressor)
       throws IOException {
-    if (!isNativeCodeLoaded()) {
-      throw new RuntimeException("native lz4 library not available");
-    }
-
     return new BlockDecompressorStream(in, decompressor, conf.getInt(
         CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_KEY,
         CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_DEFAULT));
@@ -191,10 +159,6 @@ public CompressionInputStream createInputStream(InputStream in,
    */
   @Override
   public Class<? extends Decompressor> getDecompressorType() {
-    if (!isNativeCodeLoaded()) {
-      throw new RuntimeException("native lz4 library not available");
-    }
-
     return Lz4Decompressor.class;
   }
 
@@ -205,9 +169,6 @@ public Class<? extends Decompressor> getDecompressorType() {
    */
   @Override
   public Decompressor createDecompressor() {
-    if (!isNativeCodeLoaded()) {
-      throw new RuntimeException("native lz4 library not available");
-    }
     int bufferSize = conf.getInt(
         CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_KEY,
         CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_BUFFERSIZE_DEFAULT);
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/lz4/Lz4Compressor.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/lz4/Lz4Compressor.java
index 3792c365b4d..607a802678b 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/lz4/Lz4Compressor.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/lz4/Lz4Compressor.java
@@ -22,9 +22,11 @@
 import java.nio.Buffer;
 import java.nio.ByteBuffer;
 
+import net.jpountz.lz4.LZ4Factory;
+import net.jpountz.lz4.LZ4Compressor;
+
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.io.compress.Compressor;
-import org.apache.hadoop.util.NativeCodeLoader;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -48,22 +50,7 @@ public class Lz4Compressor implements Compressor {
   private long bytesRead = 0L;
   private long bytesWritten = 0L;
 
-  private final boolean useLz4HC;
-
-  static {
-    if (NativeCodeLoader.isNativeCodeLoaded()) {
-      // Initialize the native library
-      try {
-        initIDs();
-      } catch (Throwable t) {
-        // Ignore failure to load/initialize lz4
-        LOG.warn(t.toString());
-      }
-    } else {
-      LOG.error("Cannot load " + Lz4Compressor.class.getName() +
-          " without native hadoop library!");
-    }
-  }
+  private final LZ4Compressor lz4Compressor;
 
   /**
    * Creates a new compressor.
@@ -73,9 +60,21 @@ public class Lz4Compressor implements Compressor {
    *                 which trades CPU for compression ratio.
    */
   public Lz4Compressor(int directBufferSize, boolean useLz4HC) {
-    this.useLz4HC = useLz4HC;
     this.directBufferSize = directBufferSize;
 
+    try {
+      LZ4Factory lz4Factory = LZ4Factory.fastestInstance();
+      if (useLz4HC) {
+        lz4Compressor = lz4Factory.highCompressor();
+      } else {
+        lz4Compressor = lz4Factory.fastCompressor();
+      }
+    } catch (AssertionError t) {
+      throw new RuntimeException("lz4-java library is not available: " +
+              "Lz4Compressor has not been loaded. You need to add " +
+              "lz4-java.jar to your CLASSPATH. " + t, t);
+    }
+
     uncompressedDirectBuf = ByteBuffer.allocateDirect(directBufferSize);
     compressedDirectBuf = ByteBuffer.allocateDirect(directBufferSize);
     compressedDirectBuf.position(directBufferSize);
@@ -236,7 +235,7 @@ public synchronized int compress(byte[] b, int off, int len)
     }
 
     // Compress data
-    n = useLz4HC ? compressBytesDirectHC() : compressBytesDirect();
+    n = compressDirectBuf();
     compressedDirectBuf.limit(n);
     uncompressedDirectBuf.clear(); // lz4 consumes all buffer input
 
@@ -302,11 +301,20 @@ public synchronized long getBytesWritten() {
   public synchronized void end() {
   }
 
-  private native static void initIDs();
-
-  private native int compressBytesDirect();
-
-  private native int compressBytesDirectHC();
-
-  public native static String getLibraryName();
+  private int compressDirectBuf() {
+    if (uncompressedDirectBufLen == 0) {
+      return 0;
+    } else {
+      // Set the position and limit of `uncompressedDirectBuf` for reading
+      uncompressedDirectBuf.limit(uncompressedDirectBufLen).position(0);
+      compressedDirectBuf.clear();
+      lz4Compressor.compress((ByteBuffer) uncompressedDirectBuf,
+              (ByteBuffer) compressedDirectBuf);
+      uncompressedDirectBufLen = 0;
+      uncompressedDirectBuf.limit(directBufferSize).position(0);
+      int size = compressedDirectBuf.position();
+      compressedDirectBuf.position(0);
+      return size;
+    }
+  }
 }
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/lz4/Lz4Decompressor.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/lz4/Lz4Decompressor.java
index f26ae8481c3..2b62ef78b28 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/lz4/Lz4Decompressor.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/lz4/Lz4Decompressor.java
@@ -22,8 +22,10 @@
 import java.nio.Buffer;
 import java.nio.ByteBuffer;
 
+import net.jpountz.lz4.LZ4Factory;
+import net.jpountz.lz4.LZ4SafeDecompressor;
+
 import org.apache.hadoop.io.compress.Decompressor;
-import org.apache.hadoop.util.NativeCodeLoader;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -44,20 +46,7 @@ public class Lz4Decompressor implements Decompressor {
   private int userBufOff = 0, userBufLen = 0;
   private boolean finished;
 
-  static {
-    if (NativeCodeLoader.isNativeCodeLoaded()) {
-      // Initialize the native library
-      try {
-        initIDs();
-      } catch (Throwable t) {
-        // Ignore failure to load/initialize lz4
-        LOG.warn(t.toString());
-      }
-    } else {
-      LOG.error("Cannot load " + Lz4Compressor.class.getName() +
-          " without native hadoop library!");
-    }
-  }
+  private LZ4SafeDecompressor lz4Decompressor;
 
   /**
    * Creates a new compressor.
@@ -67,6 +56,15 @@ public class Lz4Decompressor implements Decompressor {
   public Lz4Decompressor(int directBufferSize) {
     this.directBufferSize = directBufferSize;
 
+    try {
+      LZ4Factory lz4Factory = LZ4Factory.fastestInstance();
+      lz4Decompressor = lz4Factory.safeDecompressor();
+    } catch (AssertionError t) {
+      throw new RuntimeException("lz4-java library is not available: " +
+              "Lz4Decompressor has not been loaded. You need to add " +
+              "lz4-java.jar to your CLASSPATH. " + t, t);
+    }
+
     compressedDirectBuf = ByteBuffer.allocateDirect(directBufferSize);
     uncompressedDirectBuf = ByteBuffer.allocateDirect(directBufferSize);
     uncompressedDirectBuf.position(directBufferSize);
@@ -200,7 +198,7 @@ public synchronized boolean finished() {
    * @param b   Buffer for the compressed data
    * @param off Start offset of the data
    * @param len Size of the buffer
-   * @return The actual number of bytes of compressed data.
+   * @return The actual number of bytes of uncompressed data.
    * @throws IOException
    */
   @Override
@@ -228,7 +226,7 @@ public synchronized int decompress(byte[] b, int off, int len)
       uncompressedDirectBuf.limit(directBufferSize);
 
       // Decompress data
-      n = decompressBytesDirect();
+      n = decompressDirectBuf();
       uncompressedDirectBuf.limit(n);
 
       if (userBufLen <= 0) {
@@ -272,7 +270,18 @@ public synchronized void end() {
     // do nothing
   }
 
-  private native static void initIDs();
-
-  private native int decompressBytesDirect();
+  private int decompressDirectBuf() {
+    if (compressedDirectBufLen == 0) {
+      return 0;
+    } else {
+      compressedDirectBuf.limit(compressedDirectBufLen).position(0);
+      lz4Decompressor.decompress((ByteBuffer) compressedDirectBuf,
+              (ByteBuffer) uncompressedDirectBuf);
+      compressedDirectBufLen = 0;
+      compressedDirectBuf.clear();
+      int size = uncompressedDirectBuf.position();
+      uncompressedDirectBuf.position(0);
+      return size;
+    }
+  }
 }
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/NativeLibraryChecker.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/NativeLibraryChecker.java
index e40f01195ba..3847902e797 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/NativeLibraryChecker.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/NativeLibraryChecker.java
@@ -22,7 +22,6 @@
 import org.apache.hadoop.io.erasurecode.ErasureCodeNative;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.crypto.OpensslCipher;
-import org.apache.hadoop.io.compress.Lz4Codec;
 import org.apache.hadoop.io.compress.bzip2.Bzip2Factory;
 import org.apache.hadoop.io.compress.zlib.ZlibFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
@@ -69,8 +68,6 @@ public static void main(String[] args) {
     boolean isalLoaded = false;
     boolean zStdLoaded = false;
     boolean pmdkLoaded = false;
-    // lz4 is linked within libhadoop
-    boolean lz4Loaded = nativeHadoopLoaded;
     boolean bzip2Loaded = Bzip2Factory.isNativeBzip2Loaded(conf);
     boolean openSslLoaded = false;
     boolean winutilsExists = false;
@@ -81,7 +78,6 @@ public static void main(String[] args) {
     String isalDetail = "";
     String pmdkDetail = "";
     String zstdLibraryName = "";
-    String lz4LibraryName = "";
     String bzip2LibraryName = "";
     String winutilsPath = null;
 
@@ -119,9 +115,6 @@ public static void main(String[] args) {
         openSslLoaded = true;
       }
 
-      if (lz4Loaded) {
-        lz4LibraryName = Lz4Codec.getLibraryName();
-      }
       if (bzip2Loaded) {
         bzip2LibraryName = Bzip2Factory.getLibraryName(conf);
       }
@@ -144,7 +137,6 @@ public static void main(String[] args) {
     System.out.printf("hadoop:  %b %s%n", nativeHadoopLoaded, hadoopLibraryName);
     System.out.printf("zlib:    %b %s%n", zlibLoaded, zlibLibraryName);
     System.out.printf("zstd  :  %b %s%n", zStdLoaded, zstdLibraryName);
-    System.out.printf("lz4:     %b %s%n", lz4Loaded, lz4LibraryName);
     System.out.printf("bzip2:   %b %s%n", bzip2Loaded, bzip2LibraryName);
     System.out.printf("openssl: %b %s%n", openSslLoaded, openSslDetail);
     System.out.printf("ISA-L:   %b %s%n", isalLoaded, isalDetail);
@@ -155,8 +147,8 @@ public static void main(String[] args) {
     }
 
     if ((!nativeHadoopLoaded) || (Shell.WINDOWS && (!winutilsExists)) ||
-        (checkAll && !(zlibLoaded && lz4Loaded
-            && bzip2Loaded && isalLoaded && zStdLoaded))) {
+        (checkAll && !(zlibLoaded && bzip2Loaded
+            && isalLoaded && zStdLoaded))) {
       // return 1 to indicated check failed
       ExitUtil.terminate(1);
     }
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/Lz4Compressor.c b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/Lz4Compressor.c
deleted file mode 100644
index 2c8af1b9115..00000000000
--- a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/Lz4Compressor.c
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-
-#include "org_apache_hadoop.h"
-#include "org_apache_hadoop_io_compress_lz4_Lz4Compressor.h"
-
-#ifdef UNIX
-#include "config.h"
-#endif // UNIX
-#include "lz4.h"
-#include "lz4hc.h"
-
-
-static jfieldID Lz4Compressor_uncompressedDirectBuf;
-static jfieldID Lz4Compressor_uncompressedDirectBufLen;
-static jfieldID Lz4Compressor_compressedDirectBuf;
-static jfieldID Lz4Compressor_directBufferSize;
-
-
-JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_initIDs
-(JNIEnv *env, jclass clazz){
-
-  Lz4Compressor_uncompressedDirectBuf = (*env)->GetFieldID(env, clazz,
-                                                           "uncompressedDirectBuf",
-                                                           "Ljava/nio/Buffer;");
-  Lz4Compressor_uncompressedDirectBufLen = (*env)->GetFieldID(env, clazz,
-                                                              "uncompressedDirectBufLen", "I");
-  Lz4Compressor_compressedDirectBuf = (*env)->GetFieldID(env, clazz,
-                                                         "compressedDirectBuf",
-                                                         "Ljava/nio/Buffer;");
-  Lz4Compressor_directBufferSize = (*env)->GetFieldID(env, clazz,
-                                                       "directBufferSize", "I");
-}
-
-JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_compressBytesDirect
-(JNIEnv *env, jobject thisj){
-  const char* uncompressed_bytes;
-  char *compressed_bytes;
-
-  // Get members of Lz4Compressor
-  jobject uncompressed_direct_buf = (*env)->GetObjectField(env, thisj, Lz4Compressor_uncompressedDirectBuf);
-  jint uncompressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_uncompressedDirectBufLen);
-  jobject compressed_direct_buf = (*env)->GetObjectField(env, thisj, Lz4Compressor_compressedDirectBuf);
-  jint compressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_directBufferSize);
-
-  // Get the input direct buffer
-  uncompressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
-
-  if (uncompressed_bytes == 0) {
-    return (jint)0;
-  }
-
-  // Get the output direct buffer
-  compressed_bytes = (char *)(*env)->GetDirectBufferAddress(env, compressed_direct_buf);
-
-  if (compressed_bytes == 0) {
-    return (jint)0;
-  }
-
-  compressed_direct_buf_len = LZ4_compress(uncompressed_bytes, compressed_bytes, uncompressed_direct_buf_len);
-  if (compressed_direct_buf_len < 0){
-    THROW(env, "java/lang/InternalError", "LZ4_compress failed");
-  }
-
-  (*env)->SetIntField(env, thisj, Lz4Compressor_uncompressedDirectBufLen, 0);
-
-  return (jint)compressed_direct_buf_len;
-}
-
-JNIEXPORT jstring JNICALL
-Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_getLibraryName(
- JNIEnv *env, jclass class
- ) {
-  char version_buf[128];
-  snprintf(version_buf, sizeof(version_buf), "revision:%d", LZ4_versionNumber());
-  return (*env)->NewStringUTF(env, version_buf);
-}
-
-JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Compressor_compressBytesDirectHC
-(JNIEnv *env, jobject thisj){
-  const char* uncompressed_bytes = NULL;
-  char* compressed_bytes = NULL;
-
-  // Get members of Lz4Compressor
-  jobject uncompressed_direct_buf = (*env)->GetObjectField(env, thisj, Lz4Compressor_uncompressedDirectBuf);
-  jint uncompressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_uncompressedDirectBufLen);
-  jobject compressed_direct_buf = (*env)->GetObjectField(env, thisj, Lz4Compressor_compressedDirectBuf);
-  jint compressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Compressor_directBufferSize);
-
-  // Get the input direct buffer
-  uncompressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
-
-  if (uncompressed_bytes == 0) {
-    return (jint)0;
-  }
-
-  // Get the output direct buffer
-  compressed_bytes = (char *)(*env)->GetDirectBufferAddress(env, compressed_direct_buf);
-
-  if (compressed_bytes == 0) {
-    return (jint)0;
-  }
-
-  compressed_direct_buf_len = LZ4_compressHC(uncompressed_bytes, compressed_bytes, uncompressed_direct_buf_len);
-  if (compressed_direct_buf_len < 0){
-    THROW(env, "java/lang/InternalError", "LZ4_compressHC failed");
-  }
-
-  (*env)->SetIntField(env, thisj, Lz4Compressor_uncompressedDirectBufLen, 0);
-
-  return (jint)compressed_direct_buf_len;
-}
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/Lz4Decompressor.c b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/Lz4Decompressor.c
deleted file mode 100644
index cdeaa315d1e..00000000000
--- a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/Lz4Decompressor.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "org_apache_hadoop.h"
-#include "org_apache_hadoop_io_compress_lz4_Lz4Decompressor.h"
-
-#ifdef UNIX
-#include "config.h"
-#endif // UNIX
-#include "lz4.h"
-
-
-static jfieldID Lz4Decompressor_compressedDirectBuf;
-static jfieldID Lz4Decompressor_compressedDirectBufLen;
-static jfieldID Lz4Decompressor_uncompressedDirectBuf;
-static jfieldID Lz4Decompressor_directBufferSize;
-
-JNIEXPORT void JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Decompressor_initIDs
-(JNIEnv *env, jclass clazz){
-
-  Lz4Decompressor_compressedDirectBuf = (*env)->GetFieldID(env,clazz,
-                                                           "compressedDirectBuf",
-                                                           "Ljava/nio/Buffer;");
-  Lz4Decompressor_compressedDirectBufLen = (*env)->GetFieldID(env,clazz,
-                                                              "compressedDirectBufLen", "I");
-  Lz4Decompressor_uncompressedDirectBuf = (*env)->GetFieldID(env,clazz,
-                                                             "uncompressedDirectBuf",
-                                                             "Ljava/nio/Buffer;");
-  Lz4Decompressor_directBufferSize = (*env)->GetFieldID(env, clazz,
-                                                         "directBufferSize", "I");
-}
-
-JNIEXPORT jint JNICALL Java_org_apache_hadoop_io_compress_lz4_Lz4Decompressor_decompressBytesDirect
-(JNIEnv *env, jobject thisj){
-  const char *compressed_bytes;
-  char *uncompressed_bytes;
-
-  // Get members of Lz4Decompressor
-  jobject compressed_direct_buf = (*env)->GetObjectField(env,thisj, Lz4Decompressor_compressedDirectBuf);
-  jint compressed_direct_buf_len = (*env)->GetIntField(env,thisj, Lz4Decompressor_compressedDirectBufLen);
-  jobject uncompressed_direct_buf = (*env)->GetObjectField(env,thisj, Lz4Decompressor_uncompressedDirectBuf);
-  size_t uncompressed_direct_buf_len = (*env)->GetIntField(env, thisj, Lz4Decompressor_directBufferSize);
-
-  // Get the input direct buffer
-  compressed_bytes = (const char*)(*env)->GetDirectBufferAddress(env, compressed_direct_buf);
-
-  if (compressed_bytes == 0) {
-    return (jint)0;
-  }
-
-  // Get the output direct buffer
-  uncompressed_bytes = (char *)(*env)->GetDirectBufferAddress(env, uncompressed_direct_buf);
-
-  if (uncompressed_bytes == 0) {
-    return (jint)0;
-  }
-
-  uncompressed_direct_buf_len = LZ4_decompress_safe(compressed_bytes, uncompressed_bytes, compressed_direct_buf_len, uncompressed_direct_buf_len);
-  if (uncompressed_direct_buf_len < 0) {
-    THROW(env, "java/lang/InternalError", "LZ4_uncompress_unknownOutputSize failed.");
-  }
-
-  (*env)->SetIntField(env, thisj, Lz4Decompressor_compressedDirectBufLen, 0);
-
-  return (jint)uncompressed_direct_buf_len;
-}
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.c b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.c
deleted file mode 100644
index 34a61733f25..00000000000
--- a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.c
+++ /dev/null
@@ -1,897 +0,0 @@
-/*
-   LZ4 HC - High Compression Mode of LZ4
-   Copyright (C) 2011-2014, Yann Collet.
-   BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
-
-   Redistribution and use in source and binary forms, with or without
-   modification, are permitted provided that the following conditions are
-   met:
-
-       * Redistributions of source code must retain the above copyright
-   notice, this list of conditions and the following disclaimer.
-       * Redistributions in binary form must reproduce the above
-   copyright notice, this list of conditions and the following disclaimer
-   in the documentation and/or other materials provided with the
-   distribution.
-
-   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-   You can contact the author at :
-   - LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
-   - LZ4 source repository : http://code.google.com/p/lz4/
-*/
-
-
-
-/**************************************
-   Tuning Parameter
-**************************************/
-#define LZ4HC_DEFAULT_COMPRESSIONLEVEL 8
-
-
-/**************************************
-   Memory routines
-**************************************/
-#include <stdlib.h>   /* calloc, free */
-#define ALLOCATOR(s)  calloc(1,s)
-#define FREEMEM       free
-#include <string.h>   /* memset, memcpy */
-#define MEM_INIT      memset
-
-
-/**************************************
-   CPU Feature Detection
-**************************************/
-/* 32 or 64 bits ? */
-#if (defined(__x86_64__) || defined(_M_X64) || defined(_WIN64) \
-  || defined(__64BIT__)  || defined(__mips64) \
-  || defined(__powerpc64__) || defined(__powerpc64le__) \
-  || defined(__ppc64__) || defined(__ppc64le__) \
-  || defined(__PPC64__) || defined(__PPC64LE__) \
-  || defined(__ia64) || defined(__itanium__) || defined(_M_IA64) \
-  || defined(__s390x__) )   /* Detects 64 bits mode */
-#  define LZ4_ARCH64 1
-#else
-#  define LZ4_ARCH64 0
-#endif
-
-/*
- * Little Endian or Big Endian ?
- * Overwrite the #define below if you know your architecture endianess
- */
-#include <stdlib.h>   /* Apparently required to detect endianess */
-#if defined (__GLIBC__)
-#  include <endian.h>
-#  if (__BYTE_ORDER == __BIG_ENDIAN)
-#     define LZ4_BIG_ENDIAN 1
-#  endif
-#elif (defined(__BIG_ENDIAN__) || defined(__BIG_ENDIAN) || defined(_BIG_ENDIAN)) && !(defined(__LITTLE_ENDIAN__) || defined(__LITTLE_ENDIAN) || defined(_LITTLE_ENDIAN))
-#  define LZ4_BIG_ENDIAN 1
-#elif defined(__sparc) || defined(__sparc__) \
-   || defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) \
-   || defined(__hpux)  || defined(__hppa) \
-   || defined(_MIPSEB) || defined(__s390__)
-#  define LZ4_BIG_ENDIAN 1
-#else
-/* Little Endian assumed. PDP Endian and other very rare endian format are unsupported. */
-#endif
-
-/*
- * Unaligned memory access is automatically enabled for "common" CPU, such as x86.
- * For others CPU, the compiler will be more cautious, and insert extra code to ensure aligned access is respected
- * If you know your target CPU supports unaligned memory access, you want to force this option manually to improve performance
- */
-#if defined(__ARM_FEATURE_UNALIGNED)
-#  define LZ4_FORCE_UNALIGNED_ACCESS 1
-#endif
-
-/* Define this parameter if your target system or compiler does not support hardware bit count */
-#if defined(_MSC_VER) && defined(_WIN32_WCE)            /* Visual Studio for Windows CE does not support Hardware bit count */
-#  define LZ4_FORCE_SW_BITCOUNT
-#endif
-
-
-/**************************************
- Compiler Options
-**************************************/
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)   /* C99 */
-/* "restrict" is a known keyword */
-#else
-#  define restrict /* Disable restrict */
-#endif
-
-#ifdef _MSC_VER    /* Visual Studio */
-#  define FORCE_INLINE static __forceinline
-#  include <intrin.h>                    /* For Visual 2005 */
-#  if LZ4_ARCH64   /* 64-bits */
-#    pragma intrinsic(_BitScanForward64) /* For Visual 2005 */
-#    pragma intrinsic(_BitScanReverse64) /* For Visual 2005 */
-#  else            /* 32-bits */
-#    pragma intrinsic(_BitScanForward)   /* For Visual 2005 */
-#    pragma intrinsic(_BitScanReverse)   /* For Visual 2005 */
-#  endif
-#  pragma warning(disable : 4127)        /* disable: C4127: conditional expression is constant */
-#  pragma warning(disable : 4701)        /* disable: C4701: potentially uninitialized local variable used */
-#else
-#  ifdef __GNUC__
-#    define FORCE_INLINE static inline __attribute__((always_inline))
-#  else
-#    define FORCE_INLINE static inline
-#  endif
-#endif
-
-#ifdef _MSC_VER  /* Visual Studio */
-#  define lz4_bswap16(x) _byteswap_ushort(x)
-#else
-#  define lz4_bswap16(x)  ((unsigned short int) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
-#endif
-
-
-/**************************************
-   Includes
-**************************************/
-#include "lz4hc.h"
-#include "lz4.h"
-
-
-/**************************************
-   Basic Types
-**************************************/
-#if defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)   /* C99 */
-# include <stdint.h>
-  typedef uint8_t  BYTE;
-  typedef uint16_t U16;
-  typedef uint32_t U32;
-  typedef  int32_t S32;
-  typedef uint64_t U64;
-#else
-  typedef unsigned char       BYTE;
-  typedef unsigned short      U16;
-  typedef unsigned int        U32;
-  typedef   signed int        S32;
-  typedef unsigned long long  U64;
-#endif
-
-#if defined(__GNUC__)  && !defined(LZ4_FORCE_UNALIGNED_ACCESS)
-#  define _PACKED __attribute__ ((packed))
-#else
-#  define _PACKED
-#endif
-
-#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
-#  ifdef __IBMC__
-#    pragma pack(1)
-#  else
-#    pragma pack(push, 1)
-#  endif
-#endif
-
-typedef struct _U16_S { U16 v; } _PACKED U16_S;
-typedef struct _U32_S { U32 v; } _PACKED U32_S;
-typedef struct _U64_S { U64 v; } _PACKED U64_S;
-
-#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
-#  pragma pack(pop)
-#endif
-
-#define A64(x) (((U64_S *)(x))->v)
-#define A32(x) (((U32_S *)(x))->v)
-#define A16(x) (((U16_S *)(x))->v)
-
-
-/**************************************
-   Constants
-**************************************/
-#define MINMATCH 4
-
-#define DICTIONARY_LOGSIZE 16
-#define MAXD (1<<DICTIONARY_LOGSIZE)
-#define MAXD_MASK ((U32)(MAXD - 1))
-#define MAX_DISTANCE (MAXD - 1)
-
-#define HASH_LOG (DICTIONARY_LOGSIZE-1)
-#define HASHTABLESIZE (1 << HASH_LOG)
-#define HASH_MASK (HASHTABLESIZE - 1)
-
-#define ML_BITS  4
-#define ML_MASK  (size_t)((1U<<ML_BITS)-1)
-#define RUN_BITS (8-ML_BITS)
-#define RUN_MASK ((1U<<RUN_BITS)-1)
-
-#define COPYLENGTH 8
-#define LASTLITERALS 5
-#define MFLIMIT (COPYLENGTH+MINMATCH)
-#define MINLENGTH (MFLIMIT+1)
-#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
-
-#define KB *(1U<<10)
-#define MB *(1U<<20)
-#define GB *(1U<<30)
-
-
-/**************************************
-   Architecture-specific macros
-**************************************/
-#if LZ4_ARCH64   /* 64-bit */
-#  define STEPSIZE 8
-#  define LZ4_COPYSTEP(s,d)     A64(d) = A64(s); d+=8; s+=8;
-#  define LZ4_COPYPACKET(s,d)   LZ4_COPYSTEP(s,d)
-#  define AARCH A64
-#  define HTYPE                 U32
-#  define INITBASE(b,s)         const BYTE* const b = s
-#else            /* 32-bit */
-#  define STEPSIZE 4
-#  define LZ4_COPYSTEP(s,d)     A32(d) = A32(s); d+=4; s+=4;
-#  define LZ4_COPYPACKET(s,d)   LZ4_COPYSTEP(s,d); LZ4_COPYSTEP(s,d);
-#  define AARCH A32
-#  define HTYPE                 U32
-#  define INITBASE(b,s)         const BYTE* const b = s
-#endif
-
-#if defined(LZ4_BIG_ENDIAN)
-#  define LZ4_READ_LITTLEENDIAN_16(d,s,p) { U16 v = A16(p); v = lz4_bswap16(v); d = (s) - v; }
-#  define LZ4_WRITE_LITTLEENDIAN_16(p,i)  { U16 v = (U16)(i); v = lz4_bswap16(v); A16(p) = v; p+=2; }
-#else      /* Little Endian */
-#  define LZ4_READ_LITTLEENDIAN_16(d,s,p) { d = (s) - A16(p); }
-#  define LZ4_WRITE_LITTLEENDIAN_16(p,v)  { A16(p) = v; p+=2; }
-#endif
-
-
-/**************************************
-   Local Types
-**************************************/
-typedef struct
-{
-    const BYTE* inputBuffer;
-    const BYTE* base;
-    const BYTE* end;
-    HTYPE hashTable[HASHTABLESIZE];
-    U16 chainTable[MAXD];
-    const BYTE* nextToUpdate;
-} LZ4HC_Data_Structure;
-
-
-/**************************************
-   Macros
-**************************************/
-#define LZ4_WILDCOPY(s,d,e)    do { LZ4_COPYPACKET(s,d) } while (d<e);
-#define LZ4_BLINDCOPY(s,d,l)   { BYTE* e=d+l; LZ4_WILDCOPY(s,d,e); d=e; }
-#define HASH_FUNCTION(i)       (((i) * 2654435761U) >> ((MINMATCH*8)-HASH_LOG))
-#define HASH_VALUE(p)          HASH_FUNCTION(A32(p))
-#define HASH_POINTER(p)        (HashTable[HASH_VALUE(p)] + base)
-#define DELTANEXT(p)           chainTable[(size_t)(p) & MAXD_MASK]
-#define GETNEXT(p)             ((p) - (size_t)DELTANEXT(p))
-
-
-/**************************************
- Private functions
-**************************************/
-#if LZ4_ARCH64
-
-FORCE_INLINE int LZ4_NbCommonBytes (register U64 val)
-{
-#if defined(LZ4_BIG_ENDIAN)
-#  if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
-    unsigned long r = 0;
-    _BitScanReverse64( &r, val );
-    return (int)(r>>3);
-#  elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
-    return (__builtin_clzll(val) >> 3);
-#  else
-    int r;
-    if (!(val>>32)) { r=4; } else { r=0; val>>=32; }
-    if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
-    r += (!val);
-    return r;
-#  endif
-#else
-#  if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
-    unsigned long r = 0;
-    _BitScanForward64( &r, val );
-    return (int)(r>>3);
-#  elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
-    return (__builtin_ctzll(val) >> 3);
-#  else
-    static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 };
-    return DeBruijnBytePos[((U64)((val & -val) * 0x0218A392CDABBD3F)) >> 58];
-#  endif
-#endif
-}
-
-#else
-
-FORCE_INLINE int LZ4_NbCommonBytes (register U32 val)
-{
-#if defined(LZ4_BIG_ENDIAN)
-#  if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
-    unsigned long r;
-    _BitScanReverse( &r, val );
-    return (int)(r>>3);
-#  elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
-    return (__builtin_clz(val) >> 3);
-#  else
-    int r;
-    if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
-    r += (!val);
-    return r;
-#  endif
-#else
-#  if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
-    unsigned long r;
-    _BitScanForward( &r, val );
-    return (int)(r>>3);
-#  elif defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
-    return (__builtin_ctz(val) >> 3);
-#  else
-    static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 };
-    return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
-#  endif
-#endif
-}
-
-#endif
-
-
-int LZ4_sizeofStreamStateHC()
-{
-    return sizeof(LZ4HC_Data_Structure);
-}
-
-FORCE_INLINE void LZ4_initHC (LZ4HC_Data_Structure* hc4, const BYTE* base)
-{
-    MEM_INIT((void*)hc4->hashTable, 0, sizeof(hc4->hashTable));
-    MEM_INIT(hc4->chainTable, 0xFF, sizeof(hc4->chainTable));
-    hc4->nextToUpdate = base + 1;
-    hc4->base = base;
-    hc4->inputBuffer = base;
-    hc4->end = base;
-}
-
-int LZ4_resetStreamStateHC(void* state, const char* inputBuffer)
-{
-    if ((((size_t)state) & (sizeof(void*)-1)) != 0) return 1;   /* Error : pointer is not aligned for pointer (32 or 64 bits) */
-    LZ4_initHC((LZ4HC_Data_Structure*)state, (const BYTE*)inputBuffer);
-    return 0;
-}
-
-
-void* LZ4_createHC (const char* inputBuffer)
-{
-    void* hc4 = ALLOCATOR(sizeof(LZ4HC_Data_Structure));
-    LZ4_initHC ((LZ4HC_Data_Structure*)hc4, (const BYTE*)inputBuffer);
-    return hc4;
-}
-
-
-int LZ4_freeHC (void* LZ4HC_Data)
-{
-    FREEMEM(LZ4HC_Data);
-    return (0);
-}
-
-
-/* Update chains up to ip (excluded) */
-FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
-{
-    U16*   chainTable = hc4->chainTable;
-    HTYPE* HashTable  = hc4->hashTable;
-    INITBASE(base,hc4->base);
-
-    while(hc4->nextToUpdate < ip)
-    {
-        const BYTE* const p = hc4->nextToUpdate;
-        size_t delta = (p) - HASH_POINTER(p);
-        if (delta>MAX_DISTANCE) delta = MAX_DISTANCE;
-        DELTANEXT(p) = (U16)delta;
-        HashTable[HASH_VALUE(p)] = (HTYPE)((p) - base);
-        hc4->nextToUpdate++;
-    }
-}
-
-
-char* LZ4_slideInputBufferHC(void* LZ4HC_Data)
-{
-    LZ4HC_Data_Structure* hc4 = (LZ4HC_Data_Structure*)LZ4HC_Data;
-    size_t distance = (hc4->end - 64 KB) - hc4->inputBuffer;
-
-    if (hc4->end <= hc4->inputBuffer + 64 KB) return (char*)(hc4->end);   /* no update : less than 64KB within buffer */
-
-    distance = (distance >> 16) << 16;   /* Must be a multiple of 64 KB */
-    LZ4HC_Insert(hc4, hc4->end - MINMATCH);
-    memcpy((void*)(hc4->end - 64 KB - distance), (const void*)(hc4->end - 64 KB), 64 KB);
-    hc4->nextToUpdate -= distance;
-    hc4->base -= distance;
-    if ((U32)(hc4->inputBuffer - hc4->base) > 1 GB + 64 KB)   /* Avoid overflow */
-    {
-        int i;
-        hc4->base += 1 GB;
-        for (i=0; i<HASHTABLESIZE; i++) hc4->hashTable[i] -= 1 GB;
-    }
-    hc4->end -= distance;
-    return (char*)(hc4->end);
-}
-
-
-FORCE_INLINE size_t LZ4HC_CommonLength (const BYTE* p1, const BYTE* p2, const BYTE* const matchlimit)
-{
-    const BYTE* p1t = p1;
-
-    while (p1t<matchlimit-(STEPSIZE-1))
-    {
-        size_t diff = AARCH(p2) ^ AARCH(p1t);
-        if (!diff) { p1t+=STEPSIZE; p2+=STEPSIZE; continue; }
-        p1t += LZ4_NbCommonBytes(diff);
-        return (p1t - p1);
-    }
-    if (LZ4_ARCH64) if ((p1t<(matchlimit-3)) && (A32(p2) == A32(p1t))) { p1t+=4; p2+=4; }
-    if ((p1t<(matchlimit-1)) && (A16(p2) == A16(p1t))) { p1t+=2; p2+=2; }
-    if ((p1t<matchlimit) && (*p2 == *p1t)) p1t++;
-    return (p1t - p1);
-}
-
-
-FORCE_INLINE int LZ4HC_InsertAndFindBestMatch (LZ4HC_Data_Structure* hc4, const BYTE* ip, const BYTE* const matchlimit, const BYTE** matchpos, const int maxNbAttempts)
-{
-    U16* const chainTable = hc4->chainTable;
-    HTYPE* const HashTable = hc4->hashTable;
-    const BYTE* ref;
-    INITBASE(base,hc4->base);
-    int nbAttempts=maxNbAttempts;
-    size_t repl=0, ml=0;
-    U16 delta=0;  /* useless assignment, to remove an uninitialization warning */
-
-    /* HC4 match finder */
-    LZ4HC_Insert(hc4, ip);
-    ref = HASH_POINTER(ip);
-
-#define REPEAT_OPTIMIZATION
-#ifdef REPEAT_OPTIMIZATION
-    /* Detect repetitive sequences of length <= 4 */
-    if ((U32)(ip-ref) <= 4)        /* potential repetition */
-    {
-        if (A32(ref) == A32(ip))   /* confirmed */
-        {
-            delta = (U16)(ip-ref);
-            repl = ml  = LZ4HC_CommonLength(ip+MINMATCH, ref+MINMATCH, matchlimit) + MINMATCH;
-            *matchpos = ref;
-        }
-        ref = GETNEXT(ref);
-    }
-#endif
-
-    while (((U32)(ip-ref) <= MAX_DISTANCE) && (nbAttempts))
-    {
-        nbAttempts--;
-        if (*(ref+ml) == *(ip+ml))
-        if (A32(ref) == A32(ip))
-        {
-            size_t mlt = LZ4HC_CommonLength(ip+MINMATCH, ref+MINMATCH, matchlimit) + MINMATCH;
-            if (mlt > ml) { ml = mlt; *matchpos = ref; }
-        }
-        ref = GETNEXT(ref);
-    }
-
-#ifdef REPEAT_OPTIMIZATION
-    /* Complete table */
-    if (repl)
-    {
-        const BYTE* ptr = ip;
-        const BYTE* end;
-
-        end = ip + repl - (MINMATCH-1);
-        while(ptr < end-delta)
-        {
-            DELTANEXT(ptr) = delta;    /* Pre-Load */
-            ptr++;
-        }
-        do
-        {
-            DELTANEXT(ptr) = delta;
-            HashTable[HASH_VALUE(ptr)] = (HTYPE)((ptr) - base);     /* Head of chain */
-            ptr++;
-        } while(ptr < end);
-        hc4->nextToUpdate = end;
-    }
-#endif
-
-    return (int)ml;
-}
-
-
-FORCE_INLINE int LZ4HC_InsertAndGetWiderMatch (LZ4HC_Data_Structure* hc4, const BYTE* ip, const BYTE* startLimit, const BYTE* matchlimit, int longest, const BYTE** matchpos, const BYTE** startpos, const int maxNbAttempts)
-{
-    U16* const  chainTable = hc4->chainTable;
-    HTYPE* const HashTable = hc4->hashTable;
-    INITBASE(base,hc4->base);
-    const BYTE*  ref;
-    int nbAttempts = maxNbAttempts;
-    int delta = (int)(ip-startLimit);
-
-    /* First Match */
-    LZ4HC_Insert(hc4, ip);
-    ref = HASH_POINTER(ip);
-
-    while (((U32)(ip-ref) <= MAX_DISTANCE) && (nbAttempts))
-    {
-        nbAttempts--;
-        if (*(startLimit + longest) == *(ref - delta + longest))
-        if (A32(ref) == A32(ip))
-        {
-#if 1
-            const BYTE* reft = ref+MINMATCH;
-            const BYTE* ipt = ip+MINMATCH;
-            const BYTE* startt = ip;
-
-            while (ipt<matchlimit-(STEPSIZE-1))
-            {
-                size_t diff = AARCH(reft) ^ AARCH(ipt);
-                if (!diff) { ipt+=STEPSIZE; reft+=STEPSIZE; continue; }
-                ipt += LZ4_NbCommonBytes(diff);
-                goto _endCount;
-            }
-            if (LZ4_ARCH64) if ((ipt<(matchlimit-3)) && (A32(reft) == A32(ipt))) { ipt+=4; reft+=4; }
-            if ((ipt<(matchlimit-1)) && (A16(reft) == A16(ipt))) { ipt+=2; reft+=2; }
-            if ((ipt<matchlimit) && (*reft == *ipt)) ipt++;
-_endCount:
-            reft = ref;
-#else
-            /* Easier for code maintenance, but unfortunately slower too */
-            const BYTE* startt = ip;
-            const BYTE* reft = ref;
-            const BYTE* ipt = ip + MINMATCH + LZ4HC_CommonLength(ip+MINMATCH, ref+MINMATCH, matchlimit);
-#endif
-
-            while ((startt>startLimit) && (reft > hc4->inputBuffer) && (startt[-1] == reft[-1])) {startt--; reft--;}
-
-            if ((ipt-startt) > longest)
-            {
-                longest = (int)(ipt-startt);
-                *matchpos = reft;
-                *startpos = startt;
-            }
-        }
-        ref = GETNEXT(ref);
-    }
-
-    return longest;
-}
-
-
-typedef enum { noLimit = 0, limitedOutput = 1 } limitedOutput_directive;
-
-FORCE_INLINE int LZ4HC_encodeSequence (
-                       const BYTE** ip,
-                       BYTE** op,
-                       const BYTE** anchor,
-                       int matchLength,
-                       const BYTE* ref,
-                       limitedOutput_directive limitedOutputBuffer,
-                       BYTE* oend)
-{
-    int length;
-    BYTE* token;
-
-    /* Encode Literal length */
-    length = (int)(*ip - *anchor);
-    token = (*op)++;
-    if ((limitedOutputBuffer) && ((*op + length + (2 + 1 + LASTLITERALS) + (length>>8)) > oend)) return 1;   /* Check output limit */
-    if (length>=(int)RUN_MASK) { int len; *token=(RUN_MASK<<ML_BITS); len = length-RUN_MASK; for(; len > 254 ; len-=255) *(*op)++ = 255;  *(*op)++ = (BYTE)len; }
-    else *token = (BYTE)(length<<ML_BITS);
-
-    /* Copy Literals */
-    LZ4_BLINDCOPY(*anchor, *op, length);
-
-    /* Encode Offset */
-    LZ4_WRITE_LITTLEENDIAN_16(*op,(U16)(*ip-ref));
-
-    /* Encode MatchLength */
-    length = (int)(matchLength-MINMATCH);
-    if ((limitedOutputBuffer) && (*op + (1 + LASTLITERALS) + (length>>8) > oend)) return 1;   /* Check output limit */
-    if (length>=(int)ML_MASK) { *token+=ML_MASK; length-=ML_MASK; for(; length > 509 ; length-=510) { *(*op)++ = 255; *(*op)++ = 255; } if (length > 254) { length-=255; *(*op)++ = 255; } *(*op)++ = (BYTE)length; }
-    else *token += (BYTE)(length);
-
-    /* Prepare next loop */
-    *ip += matchLength;
-    *anchor = *ip;
-
-    return 0;
-}
-
-
-#define MAX_COMPRESSION_LEVEL 16
-static int LZ4HC_compress_generic (
-                 void* ctxvoid,
-                 const char* source,
-                 char* dest,
-                 int inputSize,
-                 int maxOutputSize,
-                 int compressionLevel,
-                 limitedOutput_directive limit
-                )
-{
-    LZ4HC_Data_Structure* ctx = (LZ4HC_Data_Structure*) ctxvoid;
-    const BYTE* ip = (const BYTE*) source;
-    const BYTE* anchor = ip;
-    const BYTE* const iend = ip + inputSize;
-    const BYTE* const mflimit = iend - MFLIMIT;
-    const BYTE* const matchlimit = (iend - LASTLITERALS);
-
-    BYTE* op = (BYTE*) dest;
-    BYTE* const oend = op + maxOutputSize;
-
-    const int maxNbAttempts = compressionLevel > MAX_COMPRESSION_LEVEL ? 1 << MAX_COMPRESSION_LEVEL : compressionLevel ? 1<<(compressionLevel-1) : 1<<LZ4HC_DEFAULT_COMPRESSIONLEVEL;
-    int   ml, ml2, ml3, ml0;
-    const BYTE* ref=NULL;
-    const BYTE* start2=NULL;
-    const BYTE* ref2=NULL;
-    const BYTE* start3=NULL;
-    const BYTE* ref3=NULL;
-    const BYTE* start0;
-    const BYTE* ref0;
-
-
-    /* Ensure blocks follow each other */
-    if (ip != ctx->end) return 0;
-    ctx->end += inputSize;
-
-    ip++;
-
-    /* Main Loop */
-    while (ip < mflimit)
-    {
-        ml = LZ4HC_InsertAndFindBestMatch (ctx, ip, matchlimit, (&ref), maxNbAttempts);
-        if (!ml) { ip++; continue; }
-
-        /* saved, in case we would skip too much */
-        start0 = ip;
-        ref0 = ref;
-        ml0 = ml;
-
-_Search2:
-        if (ip+ml < mflimit)
-            ml2 = LZ4HC_InsertAndGetWiderMatch(ctx, ip + ml - 2, ip + 1, matchlimit, ml, &ref2, &start2, maxNbAttempts);
-        else ml2 = ml;
-
-        if (ml2 == ml)  /* No better match */
-        {
-            if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0;
-            continue;
-        }
-
-        if (start0 < ip)
-        {
-            if (start2 < ip + ml0)   /* empirical */
-            {
-                ip = start0;
-                ref = ref0;
-                ml = ml0;
-            }
-        }
-
-        /* Here, start0==ip */
-        if ((start2 - ip) < 3)   /* First Match too small : removed */
-        {
-            ml = ml2;
-            ip = start2;
-            ref =ref2;
-            goto _Search2;
-        }
-
-_Search3:
-        /*
-         * Currently we have :
-         * ml2 > ml1, and
-         * ip1+3 <= ip2 (usually < ip1+ml1)
-         */
-        if ((start2 - ip) < OPTIMAL_ML)
-        {
-            int correction;
-            int new_ml = ml;
-            if (new_ml > OPTIMAL_ML) new_ml = OPTIMAL_ML;
-            if (ip+new_ml > start2 + ml2 - MINMATCH) new_ml = (int)(start2 - ip) + ml2 - MINMATCH;
-            correction = new_ml - (int)(start2 - ip);
-            if (correction > 0)
-            {
-                start2 += correction;
-                ref2 += correction;
-                ml2 -= correction;
-            }
-        }
-        /* Now, we have start2 = ip+new_ml, with new_ml = min(ml, OPTIMAL_ML=18) */
-
-        if (start2 + ml2 < mflimit)
-            ml3 = LZ4HC_InsertAndGetWiderMatch(ctx, start2 + ml2 - 3, start2, matchlimit, ml2, &ref3, &start3, maxNbAttempts);
-        else ml3 = ml2;
-
-        if (ml3 == ml2) /* No better match : 2 sequences to encode */
-        {
-            /* ip & ref are known; Now for ml */
-            if (start2 < ip+ml)  ml = (int)(start2 - ip);
-            /* Now, encode 2 sequences */
-            if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0;
-            ip = start2;
-            if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml2, ref2, limit, oend)) return 0;
-            continue;
-        }
-
-        if (start3 < ip+ml+3) /* Not enough space for match 2 : remove it */
-        {
-            if (start3 >= (ip+ml)) /* can write Seq1 immediately ==> Seq2 is removed, so Seq3 becomes Seq1 */
-            {
-                if (start2 < ip+ml)
-                {
-                    int correction = (int)(ip+ml - start2);
-                    start2 += correction;
-                    ref2 += correction;
-                    ml2 -= correction;
-                    if (ml2 < MINMATCH)
-                    {
-                        start2 = start3;
-                        ref2 = ref3;
-                        ml2 = ml3;
-                    }
-                }
-
-                if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0;
-                ip  = start3;
-                ref = ref3;
-                ml  = ml3;
-
-                start0 = start2;
-                ref0 = ref2;
-                ml0 = ml2;
-                goto _Search2;
-            }
-
-            start2 = start3;
-            ref2 = ref3;
-            ml2 = ml3;
-            goto _Search3;
-        }
-
-        /*
-         * OK, now we have 3 ascending matches; let's write at least the first one
-         * ip & ref are known; Now for ml
-         */
-        if (start2 < ip+ml)
-        {
-            if ((start2 - ip) < (int)ML_MASK)
-            {
-                int correction;
-                if (ml > OPTIMAL_ML) ml = OPTIMAL_ML;
-                if (ip + ml > start2 + ml2 - MINMATCH) ml = (int)(start2 - ip) + ml2 - MINMATCH;
-                correction = ml - (int)(start2 - ip);
-                if (correction > 0)
-                {
-                    start2 += correction;
-                    ref2 += correction;
-                    ml2 -= correction;
-                }
-            }
-            else
-            {
-                ml = (int)(start2 - ip);
-            }
-        }
-        if (LZ4HC_encodeSequence(&ip, &op, &anchor, ml, ref, limit, oend)) return 0;
-
-        ip = start2;
-        ref = ref2;
-        ml = ml2;
-
-        start2 = start3;
-        ref2 = ref3;
-        ml2 = ml3;
-
-        goto _Search3;
-
-    }
-
-    /* Encode Last Literals */
-    {
-        int lastRun = (int)(iend - anchor);
-        if ((limit) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize)) return 0;  /* Check output limit */
-        if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun > 254 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; }
-        else *op++ = (BYTE)(lastRun<<ML_BITS);
-        memcpy(op, anchor, iend - anchor);
-        op += iend-anchor;
-    }
-
-    /* End */
-    return (int) (((char*)op)-dest);
-}
-
-
-int LZ4_compressHC2(const char* source, char* dest, int inputSize, int compressionLevel)
-{
-    void* ctx = LZ4_createHC(source);
-    int result;
-    if (ctx==NULL) return 0;
-
-    result = LZ4HC_compress_generic (ctx, source, dest, inputSize, 0, compressionLevel, noLimit);
-
-    LZ4_freeHC(ctx);
-    return result;
-}
-
-int LZ4_compressHC(const char* source, char* dest, int inputSize) { return LZ4_compressHC2(source, dest, inputSize, 0); }
-
-int LZ4_compressHC2_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
-{
-    void* ctx = LZ4_createHC(source);
-    int result;
-    if (ctx==NULL) return 0;
-
-    result = LZ4HC_compress_generic (ctx, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
-
-    LZ4_freeHC(ctx);
-    return result;
-}
-
-int LZ4_compressHC_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize)
-{
-    return LZ4_compressHC2_limitedOutput(source, dest, inputSize, maxOutputSize, 0);
-}
-
-
-/*****************************
-   Using external allocation
-*****************************/
-int LZ4_sizeofStateHC() { return sizeof(LZ4HC_Data_Structure); }
-
-
-int LZ4_compressHC2_withStateHC (void* state, const char* source, char* dest, int inputSize, int compressionLevel)
-{
-    if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0;   /* Error : state is not aligned for pointers (32 or 64 bits) */
-    LZ4_initHC ((LZ4HC_Data_Structure*)state, (const BYTE*)source);
-    return LZ4HC_compress_generic (state, source, dest, inputSize, 0, compressionLevel, noLimit);
-}
-
-int LZ4_compressHC_withStateHC (void* state, const char* source, char* dest, int inputSize)
-{ return LZ4_compressHC2_withStateHC (state, source, dest, inputSize, 0); }
-
-
-int LZ4_compressHC2_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
-{
-    if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0;   /* Error : state is not aligned for pointers (32 or 64 bits) */
-    LZ4_initHC ((LZ4HC_Data_Structure*)state, (const BYTE*)source);
-    return LZ4HC_compress_generic (state, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
-}
-
-int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize)
-{ return LZ4_compressHC2_limitedOutput_withStateHC (state, source, dest, inputSize, maxOutputSize, 0); }
-
-
-/****************************
-   Stream functions
-****************************/
-
-int LZ4_compressHC_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize)
-{
-    return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, 0, 0, noLimit);
-}
-
-int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel)
-{
-    return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, 0, compressionLevel, noLimit);
-}
-
-int LZ4_compressHC_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize)
-{
-    return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, 0, limitedOutput);
-}
-
-int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel)
-{
-    return LZ4HC_compress_generic (LZ4HC_Data, source, dest, inputSize, maxOutputSize, compressionLevel, limitedOutput);
-}
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h
deleted file mode 100644
index deb2394062b..00000000000
--- a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h
+++ /dev/null
@@ -1,173 +0,0 @@
-/*
-   LZ4 HC - High Compression Mode of LZ4
-   Header File
-   Copyright (C) 2011-2014, Yann Collet.
-   BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
-
-   Redistribution and use in source and binary forms, with or without
-   modification, are permitted provided that the following conditions are
-   met:
-
-       * Redistributions of source code must retain the above copyright
-   notice, this list of conditions and the following disclaimer.
-       * Redistributions in binary form must reproduce the above
-   copyright notice, this list of conditions and the following disclaimer
-   in the documentation and/or other materials provided with the
-   distribution.
-
-   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-   You can contact the author at :
-   - LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
-   - LZ4 source repository : http://code.google.com/p/lz4/
-*/
-#pragma once
-
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-
-int LZ4_compressHC (const char* source, char* dest, int inputSize);
-/*
-LZ4_compressHC :
-    return : the number of bytes in compressed buffer dest
-             or 0 if compression fails.
-    note : destination buffer must be already allocated.
-        To avoid any problem, size it to handle worst cases situations (input data not compressible)
-        Worst case size evaluation is provided by function LZ4_compressBound() (see "lz4.h")
-*/
-
-int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
-/*
-LZ4_compress_limitedOutput() :
-    Compress 'inputSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
-    If it cannot achieve it, compression will stop, and result of the function will be zero.
-    This function never writes outside of provided output buffer.
-
-    inputSize  : Max supported value is 1 GB
-    maxOutputSize : is maximum allowed size into the destination buffer (which must be already allocated)
-    return : the number of output bytes written in buffer 'dest'
-             or 0 if compression fails.
-*/
-
-
-int LZ4_compressHC2 (const char* source, char* dest, int inputSize, int compressionLevel);
-int LZ4_compressHC2_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
-/*
-    Same functions as above, but with programmable 'compressionLevel'.
-    Recommended values are between 4 and 9, although any value between 0 and 16 will work.
-    'compressionLevel'==0 means use default 'compressionLevel' value.
-    Values above 16 behave the same as 16.
-    Equivalent variants exist for all other compression functions below.
-*/
-
-/* Note :
-Decompression functions are provided within LZ4 source code (see "lz4.h") (BSD license)
-*/
-
-
-/**************************************
-   Using an external allocation
-**************************************/
-int LZ4_sizeofStateHC(void);
-int LZ4_compressHC_withStateHC               (void* state, const char* source, char* dest, int inputSize);
-int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
-
-int LZ4_compressHC2_withStateHC              (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
-int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
-
-/*
-These functions are provided should you prefer to allocate memory for compression tables with your own allocation methods.
-To know how much memory must be allocated for the compression tables, use :
-int LZ4_sizeofStateHC();
-
-Note that tables must be aligned for pointer (32 or 64 bits), otherwise compression will fail (return code 0).
-
-The allocated memory can be provided to the compressions functions using 'void* state' parameter.
-LZ4_compress_withStateHC() and LZ4_compress_limitedOutput_withStateHC() are equivalent to previously described functions.
-They just use the externally allocated memory area instead of allocating their own (on stack, or on heap).
-*/
-
-
-/**************************************
-   Streaming Functions
-**************************************/
-/* Note : these streaming functions still follows the older model */
-void* LZ4_createHC (const char* inputBuffer);
-int   LZ4_compressHC_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize);
-int   LZ4_compressHC_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize);
-char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
-int   LZ4_freeHC (void* LZ4HC_Data);
-
-int   LZ4_compressHC2_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
-int   LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
-
-/*
-These functions allow the compression of dependent blocks, where each block benefits from prior 64 KB within preceding blocks.
-In order to achieve this, it is necessary to start creating the LZ4HC Data Structure, thanks to the function :
-
-void* LZ4_createHC (const char* inputBuffer);
-The result of the function is the (void*) pointer on the LZ4HC Data Structure.
-This pointer will be needed in all other functions.
-If the pointer returned is NULL, then the allocation has failed, and compression must be aborted.
-The only parameter 'const char* inputBuffer' must, obviously, point at the beginning of input buffer.
-The input buffer must be already allocated, and size at least 192KB.
-'inputBuffer' will also be the 'const char* source' of the first block.
-
-All blocks are expected to lay next to each other within the input buffer, starting from 'inputBuffer'.
-To compress each block, use either LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue().
-Their behavior are identical to LZ4_compressHC() or LZ4_compressHC_limitedOutput(),
-but require the LZ4HC Data Structure as their first argument, and check that each block starts right after the previous one.
-If next block does not begin immediately after the previous one, the compression will fail (return 0).
-
-When it's no longer possible to lay the next block after the previous one (not enough space left into input buffer), a call to :
-char* LZ4_slideInputBufferHC(void* LZ4HC_Data);
-must be performed. It will typically copy the latest 64KB of input at the beginning of input buffer.
-Note that, for this function to work properly, minimum size of an input buffer must be 192KB.
-==> The memory position where the next input data block must start is provided as the result of the function.
-
-Compression can then resume, using LZ4_compressHC_continue() or LZ4_compressHC_limitedOutput_continue(), as usual.
-
-When compression is completed, a call to LZ4_freeHC() will release the memory used by the LZ4HC Data Structure.
-*/
-
-int LZ4_sizeofStreamStateHC(void);
-int LZ4_resetStreamStateHC(void* state, const char* inputBuffer);
-
-/*
-These functions achieve the same result as :
-void* LZ4_createHC (const char* inputBuffer);
-
-They are provided here to allow the user program to allocate memory using its own routines.
-
-To know how much space must be allocated, use LZ4_sizeofStreamStateHC();
-Note also that space must be aligned for pointers (32 or 64 bits).
-
-Once space is allocated, you must initialize it using : LZ4_resetStreamStateHC(void* state, const char* inputBuffer);
-void* state is a pointer to the space allocated.
-It must be aligned for pointers (32 or 64 bits), and be large enough.
-The parameter 'const char* inputBuffer' must, obviously, point at the beginning of input buffer.
-The input buffer must be already allocated, and size at least 192KB.
-'inputBuffer' will also be the 'const char* source' of the first block.
-
-The same space can be re-used multiple times, just by initializing it each time with LZ4_resetStreamState().
-return value of LZ4_resetStreamStateHC() must be 0 is OK.
-Any other value means there was an error (typically, state is not aligned for pointers (32 or 64 bits)).
-*/
-
-
-#if defined (__cplusplus)
-}
-#endif
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/CompressDecompressTester.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/CompressDecompressTester.java
index ec42e4625e0..c016ff03789 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/CompressDecompressTester.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/CompressDecompressTester.java
@@ -473,8 +473,7 @@ public String getName() {
   private static <T extends Compressor, E extends Decompressor> boolean isAvailable(TesterPair<T, E> pair) {
     Compressor compressor = pair.compressor;
 
-    if (compressor.getClass().isAssignableFrom(Lz4Compressor.class)
-            && (NativeCodeLoader.isNativeCodeLoaded()))
+    if (compressor.getClass().isAssignableFrom(Lz4Compressor.class))
       return true;
 
     else if (compressor.getClass().isAssignableFrom(BuiltInZlibDeflater.class)
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCodec.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCodec.java
index 462225cebfb..02785a3da03 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCodec.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCodec.java
@@ -76,7 +76,6 @@
 import org.apache.hadoop.util.NativeCodeLoader;
 import org.apache.hadoop.util.ReflectionUtils;
 import org.junit.After;
-import org.junit.Assert;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -140,22 +139,16 @@ public void testSnappyCodec() throws IOException {
   
   @Test
   public void testLz4Codec() throws IOException {
-    if (NativeCodeLoader.isNativeCodeLoaded()) {
-      if (Lz4Codec.isNativeCodeLoaded()) {
-        conf.setBoolean(
-            CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_USELZ4HC_KEY,
-            false);
-        codecTest(conf, seed, 0, "org.apache.hadoop.io.compress.Lz4Codec");
-        codecTest(conf, seed, count, "org.apache.hadoop.io.compress.Lz4Codec");
-        conf.setBoolean(
-            CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_USELZ4HC_KEY,
-            true);
-        codecTest(conf, seed, 0, "org.apache.hadoop.io.compress.Lz4Codec");
-        codecTest(conf, seed, count, "org.apache.hadoop.io.compress.Lz4Codec");
-      } else {
-        Assert.fail("Native hadoop library available but lz4 not");
-      }
-    }
+    conf.setBoolean(
+        CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_USELZ4HC_KEY,
+        false);
+    codecTest(conf, seed, 0, "org.apache.hadoop.io.compress.Lz4Codec");
+    codecTest(conf, seed, count, "org.apache.hadoop.io.compress.Lz4Codec");
+    conf.setBoolean(
+        CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_USELZ4HC_KEY,
+        true);
+    codecTest(conf, seed, 0, "org.apache.hadoop.io.compress.Lz4Codec");
+    codecTest(conf, seed, count, "org.apache.hadoop.io.compress.Lz4Codec");
   }
 
   @Test
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/lz4/TestLz4CompressorDecompressor.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/lz4/TestLz4CompressorDecompressor.java
index 6f3b076097a..8be5ec3d3f7 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/lz4/TestLz4CompressorDecompressor.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/lz4/TestLz4CompressorDecompressor.java
@@ -27,17 +27,20 @@
 import java.io.IOException;
 import java.util.Random;
 
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.io.DataInputBuffer;
 import org.apache.hadoop.io.DataOutputBuffer;
+import org.apache.hadoop.io.SequenceFile;
+import org.apache.hadoop.io.Writable;
 import org.apache.hadoop.io.compress.BlockCompressorStream;
 import org.apache.hadoop.io.compress.BlockDecompressorStream;
 import org.apache.hadoop.io.compress.CompressionInputStream;
 import org.apache.hadoop.io.compress.CompressionOutputStream;
-import org.apache.hadoop.io.compress.Lz4Codec;
 import org.apache.hadoop.io.compress.lz4.Lz4Compressor;
 import org.apache.hadoop.io.compress.lz4.Lz4Decompressor;
 import org.apache.hadoop.test.MultithreadedTestUtil;
-import org.junit.Before;
 import org.junit.Test;
 import static org.junit.Assume.*;
 
@@ -45,12 +48,7 @@ public class TestLz4CompressorDecompressor {
   
   private static final Random rnd = new Random(12345l);
 
-  @Before
-  public void before() {
-    assumeTrue(Lz4Codec.isNativeCodeLoaded());
-  }
-
-  //test on NullPointerException in {@code compressor.setInput()} 
+  //test on NullPointerException in {@code compressor.setInput()}
   @Test
   public void testCompressorSetInputNullPointerException() {
     try {
@@ -330,4 +328,36 @@ public void doWork() throws Exception {
 
     ctx.waitFor(60000);
   }
+
+  @Test
+  public void testLz4Compatibility() throws Exception {
+    // The sequence file was created using native Lz4 codec before HADOOP-17292.
+    // After we use lz4-java for lz4 compression, this test makes sure we can
+    // decompress the sequence file correctly.
+    Path filePath = new Path(TestLz4CompressorDecompressor.class
+        .getResource("/lz4/sequencefile").toURI());
+
+    Configuration conf = new Configuration();
+    conf.setInt("io.seqfile.compress.blocksize", 1000);
+    FileSystem fs = FileSystem.get(conf);
+
+    int lines = 2000;
+
+    SequenceFile.Reader reader = new SequenceFile.Reader(fs, filePath, conf);
+
+    Writable key = (Writable)reader.getKeyClass().newInstance();
+    Writable value = (Writable)reader.getValueClass().newInstance();
+
+    int lc = 0;
+    try {
+      while (reader.next(key, value)) {
+        assertEquals("key" + lc, key.toString());
+        assertEquals("value" + lc, value.toString());
+        lc++;
+      }
+    } finally {
+      reader.close();
+    }
+    assertEquals(lines, lc);
+  }
 }
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestNativeCodeLoader.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestNativeCodeLoader.java
index d3da6c19107..98b75bba479 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestNativeCodeLoader.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestNativeCodeLoader.java
@@ -21,7 +21,6 @@
 import static org.junit.Assert.*;
 
 import org.apache.hadoop.crypto.OpensslCipher;
-import org.apache.hadoop.io.compress.Lz4Codec;
 import org.apache.hadoop.io.compress.zlib.ZlibFactory;
 import org.apache.hadoop.util.NativeCodeLoader;
 import org.slf4j.Logger;
@@ -54,7 +53,6 @@ public void testNativeCodeLoaded() {
     if (NativeCodeLoader.buildSupportsOpenssl()) {
       assertFalse(OpensslCipher.getLibraryName().isEmpty());
     }
-    assertFalse(Lz4Codec.getLibraryName().isEmpty());
     LOG.info("TestNativeCodeLoader: libhadoop.so is loaded.");
   }
 }
diff --git a/hadoop-common-project/hadoop-common/src/test/resources/lz4/.sequencefile.crc b/hadoop-common-project/hadoop-common/src/test/resources/lz4/.sequencefile.crc
new file mode 100644
index 00000000000..b36bc54a7c5
Binary files /dev/null and b/hadoop-common-project/hadoop-common/src/test/resources/lz4/.sequencefile.crc differ
diff --git a/hadoop-common-project/hadoop-common/src/test/resources/lz4/sequencefile b/hadoop-common-project/hadoop-common/src/test/resources/lz4/sequencefile
new file mode 100644
index 00000000000..eca7cdea3b3
Binary files /dev/null and b/hadoop-common-project/hadoop-common/src/test/resources/lz4/sequencefile differ
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/pom.xml b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/pom.xml
index 2fed9f4a9df..c2a521f9e90 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/pom.xml
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/pom.xml
@@ -71,6 +71,11 @@
       <artifactId>assertj-core</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.lz4</groupId>
+      <artifactId>lz4-java</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>
@@ -156,9 +161,9 @@
                 </goals>
                 <configuration>
                   <target>
-                    <copy file="${basedir}/../../../hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.h"
+                    <copy file="${basedir}/src/main/native/lz4/lz4.h"
                       todir="${project.build.directory}/native/" />
-                    <copy file="${basedir}/../../../hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.c"
+                    <copy file="${basedir}/src/main/native/lz4/lz4.c"
                       todir="${project.build.directory}/native/" />
                     <copy todir="${project.build.directory}/native/test/testData"
                       overwrite="true">
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.c b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/native/lz4/lz4.c
similarity index 100%
rename from hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.c
rename to hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/native/lz4/lz4.c
diff --git a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.h b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/native/lz4/lz4.h
similarity index 100%
rename from hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.h
rename to hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/native/lz4/lz4.h
diff --git a/hadoop-project/pom.xml b/hadoop-project/pom.xml
index 22e0244cbd1..928a36f3413 100644
--- a/hadoop-project/pom.xml
+++ b/hadoop-project/pom.xml
@@ -145,6 +145,7 @@
     <netty3.version>3.10.6.Final</netty3.version>
     <netty4.version>4.1.50.Final</netty4.version>
     <snappy-java.version>1.1.8.2</snappy-java.version>
+    <lz4-java.version>1.7.1</lz4-java.version>
 
     <!-- Maven protoc compiler -->
     <protobuf-maven-plugin.version>0.5.1</protobuf-maven-plugin.version>
@@ -1732,6 +1733,11 @@
         <artifactId>snappy-java</artifactId>
         <version>${snappy-java.version}</version>
       </dependency>
+      <dependency>
+        <groupId>org.lz4</groupId>
+        <artifactId>lz4-java</artifactId>
+        <version>${lz4-java.version}</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>