HADOOP-17292. Using lz4-java in Lz4Codec (#2350)

Contributed by Liang-Chi Hsieh.

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>

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}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/Lz4Codec.java

@@ -27,17 +27,12 @@ import org.apache.hadoop.conf.Configuration;
 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 class Lz4Codec implements Configurable, CompressionCodec {
     return conf;
   }
 
-  /**
-   * Are the native lz4 libraries loaded & initialized?
-   *
-   * @return true if loaded & 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 class Lz4Codec implements Configurable, CompressionCodec {
   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 class Lz4Codec implements Configurable, CompressionCodec {
    */
   @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 Lz4Codec implements Configurable, CompressionCodec {
    */
   @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 class Lz4Codec implements Configurable, CompressionCodec {
   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 class Lz4Codec implements Configurable, CompressionCodec {
    */
   @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 Lz4Codec implements Configurable, CompressionCodec {
    */
   @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);

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/lz4/Lz4Compressor.java

@@ -22,9 +22,11 @@ import java.io.IOException;
 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;
 
@@ -49,22 +51,7 @@ public class Lz4Compressor implements Compressor {
   private long bytesRead = 0L;
   private long bytesWritten = 0L;
 
-  private final boolean useLz4HC;
+  private final LZ4Compressor lz4Compressor;
-
-  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!");
-    }
-  }
 
   /**
    * Creates a new compressor.
@@ -74,9 +61,21 @@ 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);
 
     // Compression is guaranteed to succeed if 'dstCapacity' >=
@@ -243,7 +242,7 @@ public class Lz4Compressor implements Compressor {
     }
 
     // Compress data
-    n = useLz4HC ? compressBytesDirectHC() : compressBytesDirect();
+    n = compressDirectBuf();
     compressedDirectBuf.limit(n);
     uncompressedDirectBuf.clear(); // lz4 consumes all buffer input
 
@@ -309,11 +308,20 @@ public class Lz4Compressor implements Compressor {
   public synchronized void end() {
   }
 
-  private native static void initIDs();
+  private int compressDirectBuf() {
-
+    if (uncompressedDirectBufLen == 0) {
-  private native int compressBytesDirect();
+      return 0;
-
+    } else {
-  private native int compressBytesDirectHC();
+      // Set the position and limit of `uncompressedDirectBuf` for reading
-
+      uncompressedDirectBuf.limit(uncompressedDirectBufLen).position(0);
-  public native static String getLibraryName();
+      compressedDirectBuf.clear();
+      lz4Compressor.compress((ByteBuffer) uncompressedDirectBuf,
+              (ByteBuffer) compressedDirectBuf);
+      uncompressedDirectBufLen = 0;
+      uncompressedDirectBuf.limit(directBufferSize).position(0);
+      int size = compressedDirectBuf.position();
+      compressedDirectBuf.position(0);
+      return size;
+    }
+  }
 }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/lz4/Lz4Decompressor.java

@@ -22,8 +22,10 @@ import java.io.IOException;
 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 {
+  private LZ4SafeDecompressor lz4Decompressor;
-    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!");
-    }
-  }
 
   /**
    * 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 class Lz4Decompressor implements Decompressor {
    * @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 class Lz4Decompressor implements Decompressor {
       uncompressedDirectBuf.limit(directBufferSize);
 
       // Decompress data
-      n = decompressBytesDirect();
+      n = decompressDirectBuf();
       uncompressedDirectBuf.limit(n);
 
       if (userBufLen <= 0) {
@@ -272,7 +270,18 @@ public class Lz4Decompressor implements Decompressor {
     // do nothing
   }
 
-  private native static void initIDs();
+  private int decompressDirectBuf() {
-
+    if (compressedDirectBufLen == 0) {
-  private native int decompressBytesDirect();
+      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;
+    }
+  }
 }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/NativeLibraryChecker.java

@@ -22,7 +22,6 @@ import org.apache.hadoop.io.compress.ZStandardCodec;
 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 class NativeLibraryChecker {
     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 class NativeLibraryChecker {
     String isalDetail = "";
     String pmdkDetail = "";
     String zstdLibraryName = "";
-    String lz4LibraryName = "";
     String bzip2LibraryName = "";
     String winutilsPath = null;
 
@@ -119,9 +115,6 @@ public class NativeLibraryChecker {
         openSslLoaded = true;
       }
 
-      if (lz4Loaded) {
-        lz4LibraryName = Lz4Codec.getLibraryName();
-      }
       if (bzip2Loaded) {
         bzip2LibraryName = Bzip2Factory.getLibraryName(conf);
       }
@@ -144,7 +137,6 @@ public class NativeLibraryChecker {
     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 class NativeLibraryChecker {
     }
 
     if ((!nativeHadoopLoaded) || (Shell.WINDOWS && (!winutilsExists)) ||
-        (checkAll && !(zlibLoaded && lz4Loaded
+        (checkAll && !(zlibLoaded && bzip2Loaded
-            && bzip2Loaded && isalLoaded && zStdLoaded))) {
+            && isalLoaded && zStdLoaded))) {
       // return 1 to indicated check failed
       ExitUtil.terminate(1);
     }

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/Lz4Compressor.c

@@ -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_dstCapacity;
-
-
-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_dstCapacity = (*env)->GetFieldID(env, clazz,
-                                                       "dstCapacity", "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_dstCapacity);
-
-  // 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_default(uncompressed_bytes, compressed_bytes, uncompressed_direct_buf_len, compressed_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_dstCapacity);
-
-  // 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_HC(uncompressed_bytes, compressed_bytes, uncompressed_direct_buf_len, compressed_direct_buf_len, 0);
-  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;
-}

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/Lz4Decompressor.c

@@ -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;
-}

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h

@@ -1,438 +0,0 @@
-/*
-   LZ4 HC - High Compression Mode of LZ4
-   Header File
-   Copyright (C) 2011-2017, 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 source repository : https://github.com/lz4/lz4
-   - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
-*/
-#ifndef LZ4_HC_H_19834876238432
-#define LZ4_HC_H_19834876238432
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-/* --- Dependency --- */
-/* note : lz4hc requires lz4.h/lz4.c for compilation */
-#include "lz4.h"   /* stddef, LZ4LIB_API, LZ4_DEPRECATED */
-
-
-/* --- Useful constants --- */
-#define LZ4HC_CLEVEL_MIN         3
-#define LZ4HC_CLEVEL_DEFAULT     9
-#define LZ4HC_CLEVEL_OPT_MIN    10
-#define LZ4HC_CLEVEL_MAX        12
-
-
-/*-************************************
- *  Block Compression
- **************************************/
-/*! LZ4_compress_HC() :
- *  Compress data from `src` into `dst`, using the powerful but slower "HC" algorithm.
- * `dst` must be already allocated.
- *  Compression is guaranteed to succeed if `dstCapacity >= LZ4_compressBound(srcSize)` (see "lz4.h")
- *  Max supported `srcSize` value is LZ4_MAX_INPUT_SIZE (see "lz4.h")
- * `compressionLevel` : any value between 1 and LZ4HC_CLEVEL_MAX will work.
- *                      Values > LZ4HC_CLEVEL_MAX behave the same as LZ4HC_CLEVEL_MAX.
- * @return : the number of bytes written into 'dst'
- *           or 0 if compression fails.
- */
-LZ4LIB_API int LZ4_compress_HC (const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel);
-
-
-/* Note :
- *   Decompression functions are provided within "lz4.h" (BSD license)
- */
-
-
-/*! LZ4_compress_HC_extStateHC() :
- *  Same as LZ4_compress_HC(), but using an externally allocated memory segment for `state`.
- * `state` size is provided by LZ4_sizeofStateHC().
- *  Memory segment must be aligned on 8-bytes boundaries (which a normal malloc() should do properly).
- */
-LZ4LIB_API int LZ4_sizeofStateHC(void);
-LZ4LIB_API int LZ4_compress_HC_extStateHC(void* stateHC, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
-
-
-/*! LZ4_compress_HC_destSize() : v1.9.0+
- *  Will compress as much data as possible from `src`
- *  to fit into `targetDstSize` budget.
- *  Result is provided in 2 parts :
- * @return : the number of bytes written into 'dst' (necessarily <= targetDstSize)
- *           or 0 if compression fails.
- * `srcSizePtr` : on success, *srcSizePtr is updated to indicate how much bytes were read from `src`
- */
-LZ4LIB_API int LZ4_compress_HC_destSize(void* stateHC,
-                                  const char* src, char* dst,
-                                        int* srcSizePtr, int targetDstSize,
-                                        int compressionLevel);
-
-
-/*-************************************
- *  Streaming Compression
- *  Bufferless synchronous API
- **************************************/
- typedef union LZ4_streamHC_u LZ4_streamHC_t;   /* incomplete type (defined later) */
-
-/*! LZ4_createStreamHC() and LZ4_freeStreamHC() :
- *  These functions create and release memory for LZ4 HC streaming state.
- *  Newly created states are automatically initialized.
- *  A same state can be used multiple times consecutively,
- *  starting with LZ4_resetStreamHC_fast() to start a new stream of blocks.
- */
-LZ4LIB_API LZ4_streamHC_t* LZ4_createStreamHC(void);
-LZ4LIB_API int             LZ4_freeStreamHC (LZ4_streamHC_t* streamHCPtr);
-
-/*
-  These functions compress data in successive blocks of any size,
-  using previous blocks as dictionary, to improve compression ratio.
-  One key assumption is that previous blocks (up to 64 KB) remain read-accessible while compressing next blocks.
-  There is an exception for ring buffers, which can be smaller than 64 KB.
-  Ring-buffer scenario is automatically detected and handled within LZ4_compress_HC_continue().
-
-  Before starting compression, state must be allocated and properly initialized.
-  LZ4_createStreamHC() does both, though compression level is set to LZ4HC_CLEVEL_DEFAULT.
-
-  Selecting the compression level can be done with LZ4_resetStreamHC_fast() (starts a new stream)
-  or LZ4_setCompressionLevel() (anytime, between blocks in the same stream) (experimental).
-  LZ4_resetStreamHC_fast() only works on states which have been properly initialized at least once,
-  which is automatically the case when state is created using LZ4_createStreamHC().
-
-  After reset, a first "fictional block" can be designated as initial dictionary,
-  using LZ4_loadDictHC() (Optional).
-
-  Invoke LZ4_compress_HC_continue() to compress each successive block.
-  The number of blocks is unlimited.
-  Previous input blocks, including initial dictionary when present,
-  must remain accessible and unmodified during compression.
-
-  It's allowed to update compression level anytime between blocks,
-  using LZ4_setCompressionLevel() (experimental).
-
-  'dst' buffer should be sized to handle worst case scenarios
-  (see LZ4_compressBound(), it ensures compression success).
-  In case of failure, the API does not guarantee recovery,
-  so the state _must_ be reset.
-  To ensure compression success
-  whenever `dst` buffer size cannot be made >= LZ4_compressBound(),
-  consider using LZ4_compress_HC_continue_destSize().
-
-  Whenever previous input blocks can't be preserved unmodified in-place during compression of next blocks,
-  it's possible to copy the last blocks into a more stable memory space, using LZ4_saveDictHC().
-  Return value of LZ4_saveDictHC() is the size of dictionary effectively saved into 'safeBuffer' (<= 64 KB)
-
-  After completing a streaming compression,
-  it's possible to start a new stream of blocks, using the same LZ4_streamHC_t state,
-  just by resetting it, using LZ4_resetStreamHC_fast().
-*/
-
-LZ4LIB_API void LZ4_resetStreamHC_fast(LZ4_streamHC_t* streamHCPtr, int compressionLevel);   /* v1.9.0+ */
-LZ4LIB_API int  LZ4_loadDictHC (LZ4_streamHC_t* streamHCPtr, const char* dictionary, int dictSize);
-
-LZ4LIB_API int LZ4_compress_HC_continue (LZ4_streamHC_t* streamHCPtr,
-                                   const char* src, char* dst,
-                                         int srcSize, int maxDstSize);
-
-/*! LZ4_compress_HC_continue_destSize() : v1.9.0+
- *  Similar to LZ4_compress_HC_continue(),
- *  but will read as much data as possible from `src`
- *  to fit into `targetDstSize` budget.
- *  Result is provided into 2 parts :
- * @return : the number of bytes written into 'dst' (necessarily <= targetDstSize)
- *           or 0 if compression fails.
- * `srcSizePtr` : on success, *srcSizePtr will be updated to indicate how much bytes were read from `src`.
- *           Note that this function may not consume the entire input.
- */
-LZ4LIB_API int LZ4_compress_HC_continue_destSize(LZ4_streamHC_t* LZ4_streamHCPtr,
-                                           const char* src, char* dst,
-                                                 int* srcSizePtr, int targetDstSize);
-
-LZ4LIB_API int LZ4_saveDictHC (LZ4_streamHC_t* streamHCPtr, char* safeBuffer, int maxDictSize);
-
-
-
-/*^**********************************************
- * !!!!!!   STATIC LINKING ONLY   !!!!!!
- ***********************************************/
-
-/*-******************************************************************
- * PRIVATE DEFINITIONS :
- * Do not use these definitions directly.
- * They are merely exposed to allow static allocation of `LZ4_streamHC_t`.
- * Declare an `LZ4_streamHC_t` directly, rather than any type below.
- * Even then, only do so in the context of static linking, as definitions may change between versions.
- ********************************************************************/
-
-#define LZ4HC_DICTIONARY_LOGSIZE 16
-#define LZ4HC_MAXD (1<<LZ4HC_DICTIONARY_LOGSIZE)
-#define LZ4HC_MAXD_MASK (LZ4HC_MAXD - 1)
-
-#define LZ4HC_HASH_LOG 15
-#define LZ4HC_HASHTABLESIZE (1 << LZ4HC_HASH_LOG)
-#define LZ4HC_HASH_MASK (LZ4HC_HASHTABLESIZE - 1)
-
-
-#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
-#include <stdint.h>
-
-typedef struct LZ4HC_CCtx_internal LZ4HC_CCtx_internal;
-struct LZ4HC_CCtx_internal
-{
-    uint32_t   hashTable[LZ4HC_HASHTABLESIZE];
-    uint16_t   chainTable[LZ4HC_MAXD];
-    const uint8_t* end;         /* next block here to continue on current prefix */
-    const uint8_t* base;        /* All index relative to this position */
-    const uint8_t* dictBase;    /* alternate base for extDict */
-    uint32_t   dictLimit;       /* below that point, need extDict */
-    uint32_t   lowLimit;        /* below that point, no more dict */
-    uint32_t   nextToUpdate;    /* index from which to continue dictionary update */
-    short      compressionLevel;
-    int8_t     favorDecSpeed;   /* favor decompression speed if this flag set,
-                                   otherwise, favor compression ratio */
-    int8_t     dirty;           /* stream has to be fully reset if this flag is set */
-    const LZ4HC_CCtx_internal* dictCtx;
-};
-
-#else
-
-typedef struct LZ4HC_CCtx_internal LZ4HC_CCtx_internal;
-struct LZ4HC_CCtx_internal
-{
-    unsigned int   hashTable[LZ4HC_HASHTABLESIZE];
-    unsigned short chainTable[LZ4HC_MAXD];
-    const unsigned char* end;        /* next block here to continue on current prefix */
-    const unsigned char* base;       /* All index relative to this position */
-    const unsigned char* dictBase;   /* alternate base for extDict */
-    unsigned int   dictLimit;        /* below that point, need extDict */
-    unsigned int   lowLimit;         /* below that point, no more dict */
-    unsigned int   nextToUpdate;     /* index from which to continue dictionary update */
-    short          compressionLevel;
-    char           favorDecSpeed;    /* favor decompression speed if this flag set,
-                                        otherwise, favor compression ratio */
-    char           dirty;            /* stream has to be fully reset if this flag is set */
-    const LZ4HC_CCtx_internal* dictCtx;
-};
-
-#endif
-
-
-/* Do not use these definitions directly !
- * Declare or allocate an LZ4_streamHC_t instead.
- */
-#define LZ4_STREAMHCSIZE       (4*LZ4HC_HASHTABLESIZE + 2*LZ4HC_MAXD + 56 + ((sizeof(void*)==16) ? 56 : 0) /* AS400*/ ) /* 262200 or 262256*/
-#define LZ4_STREAMHCSIZE_SIZET (LZ4_STREAMHCSIZE / sizeof(size_t))
-union LZ4_streamHC_u {
-    size_t table[LZ4_STREAMHCSIZE_SIZET];
-    LZ4HC_CCtx_internal internal_donotuse;
-}; /* previously typedef'd to LZ4_streamHC_t */
-
-/* LZ4_streamHC_t :
- * This structure allows static allocation of LZ4 HC streaming state.
- * This can be used to allocate statically, on state, or as part of a larger structure.
- *
- * Such state **must** be initialized using LZ4_initStreamHC() before first use.
- *
- * Note that invoking LZ4_initStreamHC() is not required when
- * the state was created using LZ4_createStreamHC() (which is recommended).
- * Using the normal builder, a newly created state is automatically initialized.
- *
- * Static allocation shall only be used in combination with static linking.
- */
-
-/* LZ4_initStreamHC() : v1.9.0+
- * Required before first use of a statically allocated LZ4_streamHC_t.
- * Before v1.9.0 : use LZ4_resetStreamHC() instead
- */
-LZ4LIB_API LZ4_streamHC_t* LZ4_initStreamHC (void* buffer, size_t size);
-
-
-/*-************************************
-*  Deprecated Functions
-**************************************/
-/* see lz4.h LZ4_DISABLE_DEPRECATE_WARNINGS to turn off deprecation warnings */
-
-/* deprecated compression functions */
-LZ4_DEPRECATED("use LZ4_compress_HC() instead") LZ4LIB_API int LZ4_compressHC               (const char* source, char* dest, int inputSize);
-LZ4_DEPRECATED("use LZ4_compress_HC() instead") LZ4LIB_API int LZ4_compressHC_limitedOutput (const char* source, char* dest, int inputSize, int maxOutputSize);
-LZ4_DEPRECATED("use LZ4_compress_HC() instead") LZ4LIB_API int LZ4_compressHC2              (const char* source, char* dest, int inputSize, int compressionLevel);
-LZ4_DEPRECATED("use LZ4_compress_HC() instead") LZ4LIB_API int LZ4_compressHC2_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
-LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") LZ4LIB_API int LZ4_compressHC_withStateHC               (void* state, const char* source, char* dest, int inputSize);
-LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") LZ4LIB_API int LZ4_compressHC_limitedOutput_withStateHC (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
-LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") LZ4LIB_API int LZ4_compressHC2_withStateHC              (void* state, const char* source, char* dest, int inputSize, int compressionLevel);
-LZ4_DEPRECATED("use LZ4_compress_HC_extStateHC() instead") LZ4LIB_API int LZ4_compressHC2_limitedOutput_withStateHC(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
-LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") LZ4LIB_API int LZ4_compressHC_continue               (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize);
-LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") LZ4LIB_API int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
-
-/* Obsolete streaming functions; degraded functionality; do not use!
- *
- * In order to perform streaming compression, these functions depended on data
- * that is no longer tracked in the state. They have been preserved as well as
- * possible: using them will still produce a correct output. However, use of
- * LZ4_slideInputBufferHC() will truncate the history of the stream, rather
- * than preserve a window-sized chunk of history.
- */
-LZ4_DEPRECATED("use LZ4_createStreamHC() instead") LZ4LIB_API void* LZ4_createHC (const char* inputBuffer);
-LZ4_DEPRECATED("use LZ4_saveDictHC() instead") LZ4LIB_API     char* LZ4_slideInputBufferHC (void* LZ4HC_Data);
-LZ4_DEPRECATED("use LZ4_freeStreamHC() instead") LZ4LIB_API   int   LZ4_freeHC (void* LZ4HC_Data);
-LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") LZ4LIB_API int LZ4_compressHC2_continue               (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int compressionLevel);
-LZ4_DEPRECATED("use LZ4_compress_HC_continue() instead") LZ4LIB_API int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* source, char* dest, int inputSize, int maxOutputSize, int compressionLevel);
-LZ4_DEPRECATED("use LZ4_createStreamHC() instead") LZ4LIB_API int   LZ4_sizeofStreamStateHC(void);
-LZ4_DEPRECATED("use LZ4_initStreamHC() instead") LZ4LIB_API  int   LZ4_resetStreamStateHC(void* state, char* inputBuffer);
-
-
-/* LZ4_resetStreamHC() is now replaced by LZ4_initStreamHC().
- * The intention is to emphasize the difference with LZ4_resetStreamHC_fast(),
- * which is now the recommended function to start a new stream of blocks,
- * but cannot be used to initialize a memory segment containing arbitrary garbage data.
- *
- * It is recommended to switch to LZ4_initStreamHC().
- * LZ4_resetStreamHC() will generate deprecation warnings in a future version.
- */
-LZ4LIB_API void LZ4_resetStreamHC (LZ4_streamHC_t* streamHCPtr, int compressionLevel);
-
-
-#if defined (__cplusplus)
-}
-#endif
-
-#endif /* LZ4_HC_H_19834876238432 */
-
-
-/*-**************************************************
- * !!!!!     STATIC LINKING ONLY     !!!!!
- * Following definitions are considered experimental.
- * They should not be linked from DLL,
- * as there is no guarantee of API stability yet.
- * Prototypes will be promoted to "stable" status
- * after successfull usage in real-life scenarios.
- ***************************************************/
-#ifdef LZ4_HC_STATIC_LINKING_ONLY   /* protection macro */
-#ifndef LZ4_HC_SLO_098092834
-#define LZ4_HC_SLO_098092834
-
-#define LZ4_STATIC_LINKING_ONLY   /* LZ4LIB_STATIC_API */
-#include "lz4.h"
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-/*! LZ4_setCompressionLevel() : v1.8.0+ (experimental)
- *  It's possible to change compression level
- *  between successive invocations of LZ4_compress_HC_continue*()
- *  for dynamic adaptation.
- */
-LZ4LIB_STATIC_API void LZ4_setCompressionLevel(
-    LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
-
-/*! LZ4_favorDecompressionSpeed() : v1.8.2+ (experimental)
- *  Opt. Parser will favor decompression speed over compression ratio.
- *  Only applicable to levels >= LZ4HC_CLEVEL_OPT_MIN.
- */
-LZ4LIB_STATIC_API void LZ4_favorDecompressionSpeed(
-    LZ4_streamHC_t* LZ4_streamHCPtr, int favor);
-
-/*! LZ4_resetStreamHC_fast() : v1.9.0+
- *  When an LZ4_streamHC_t is known to be in a internally coherent state,
- *  it can often be prepared for a new compression with almost no work, only
- *  sometimes falling back to the full, expensive reset that is always required
- *  when the stream is in an indeterminate state (i.e., the reset performed by
- *  LZ4_resetStreamHC()).
- *
- *  LZ4_streamHCs are guaranteed to be in a valid state when:
- *  - returned from LZ4_createStreamHC()
- *  - reset by LZ4_resetStreamHC()
- *  - memset(stream, 0, sizeof(LZ4_streamHC_t))
- *  - the stream was in a valid state and was reset by LZ4_resetStreamHC_fast()
- *  - the stream was in a valid state and was then used in any compression call
- *    that returned success
- *  - the stream was in an indeterminate state and was used in a compression
- *    call that fully reset the state (LZ4_compress_HC_extStateHC()) and that
- *    returned success
- *
- *  Note:
- *  A stream that was last used in a compression call that returned an error
- *  may be passed to this function. However, it will be fully reset, which will
- *  clear any existing history and settings from the context.
- */
-LZ4LIB_STATIC_API void LZ4_resetStreamHC_fast(
-    LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
-
-/*! LZ4_compress_HC_extStateHC_fastReset() :
- *  A variant of LZ4_compress_HC_extStateHC().
- *
- *  Using this variant avoids an expensive initialization step. It is only safe
- *  to call if the state buffer is known to be correctly initialized already
- *  (see above comment on LZ4_resetStreamHC_fast() for a definition of
- *  "correctly initialized"). From a high level, the difference is that this
- *  function initializes the provided state with a call to
- *  LZ4_resetStreamHC_fast() while LZ4_compress_HC_extStateHC() starts with a
- *  call to LZ4_resetStreamHC().
- */
-LZ4LIB_STATIC_API int LZ4_compress_HC_extStateHC_fastReset (
-    void* state,
-    const char* src, char* dst,
-    int srcSize, int dstCapacity,
-    int compressionLevel);
-
-/*! LZ4_attach_HC_dictionary() :
- *  This is an experimental API that allows for the efficient use of a
- *  static dictionary many times.
- *
- *  Rather than re-loading the dictionary buffer into a working context before
- *  each compression, or copying a pre-loaded dictionary's LZ4_streamHC_t into a
- *  working LZ4_streamHC_t, this function introduces a no-copy setup mechanism,
- *  in which the working stream references the dictionary stream in-place.
- *
- *  Several assumptions are made about the state of the dictionary stream.
- *  Currently, only streams which have been prepared by LZ4_loadDictHC() should
- *  be expected to work.
- *
- *  Alternatively, the provided dictionary stream pointer may be NULL, in which
- *  case any existing dictionary stream is unset.
- *
- *  A dictionary should only be attached to a stream without any history (i.e.,
- *  a stream that has just been reset).
- *
- *  The dictionary will remain attached to the working stream only for the
- *  current stream session. Calls to LZ4_resetStreamHC(_fast) will remove the
- *  dictionary context association from the working stream. The dictionary
- *  stream (and source buffer) must remain in-place / accessible / unchanged
- *  through the lifetime of the stream session.
- */
-LZ4LIB_STATIC_API void LZ4_attach_HC_dictionary(
-          LZ4_streamHC_t *working_stream,
-    const LZ4_streamHC_t *dictionary_stream);
-
-#if defined (__cplusplus)
-}
-#endif
-
-#endif   /* LZ4_HC_SLO_098092834 */
-#endif   /* LZ4_HC_STATIC_LINKING_ONLY */

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/CompressDecompressTester.java

@@ -473,8 +473,7 @@ public class CompressDecompressTester<T extends Compressor, E extends Decompress
   private static <T extends Compressor, E extends Decompressor> boolean isAvailable(TesterPair<T, E> pair) {
     Compressor compressor = pair.compressor;
 
-    if (compressor.getClass().isAssignableFrom(Lz4Compressor.class)
+    if (compressor.getClass().isAssignableFrom(Lz4Compressor.class))
-            && (NativeCodeLoader.isNativeCodeLoaded()))
       return true;
 
     else if (compressor.getClass().isAssignableFrom(BuiltInZlibDeflater.class)

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCodec.java

@@ -140,8 +140,6 @@ public class TestCodec {
   
   @Test
   public void testLz4Codec() throws IOException {
-    if (NativeCodeLoader.isNativeCodeLoaded()) {
-      if (Lz4Codec.isNativeCodeLoaded()) {
     conf.setBoolean(
         CommonConfigurationKeys.IO_COMPRESSION_CODEC_LZ4_USELZ4HC_KEY,
         false);
@@ -152,10 +150,6 @@ public class TestCodec {
         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");
-      }
-    }
   }
 
   @Test

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/lz4/TestLz4CompressorDecompressor.java

@@ -27,17 +27,20 @@ import java.io.DataOutputStream;
 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.*;
 
@@ -45,11 +48,6 @@ 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
   public void testCompressorSetInputNullPointerException() {
@@ -330,4 +328,36 @@ public class TestLz4CompressorDecompressor {
 
     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);
+  }
 }

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestNativeCodeLoader.java

@@ -21,7 +21,6 @@ import org.junit.Test;
 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 class TestNativeCodeLoader {
     if (NativeCodeLoader.buildSupportsOpenssl()) {
       assertFalse(OpensslCipher.getLibraryName().isEmpty());
     }
-    assertFalse(Lz4Codec.getLibraryName().isEmpty());
     LOG.info("TestNativeCodeLoader: libhadoop.so is loaded.");
   }
 }

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">

hadoop-project/pom.xml

@@ -144,6 +144,7 @@
     <netty3.version>3.10.6.Final</netty3.version>
     <netty4.version>4.1.50.Final</netty4.version>
     <snappy-java.version>1.1.8.1</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>
@@ -1792,6 +1793,11 @@
         <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>