HDDS-2233 - Remove ByteStringHelper and refactor the code to the plac…

…e where it used (#1596)

hadoop-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/XceiverClientManager.java

@@ -36,15 +36,18 @@
 import org.apache.hadoop.ozone.OzoneConfigKeys;
 import org.apache.hadoop.ozone.OzoneSecurityUtil;
 import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.ratis.thirdparty.com.google.protobuf.ByteString;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.Closeable;
 import java.io.IOException;
+import java.nio.ByteBuffer;
 import java.security.cert.CertificateException;
 import java.security.cert.X509Certificate;
 import java.util.concurrent.Callable;
 import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
 
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static org.apache.hadoop.hdds.conf.ConfigTag.OZONE;
@@ -307,6 +310,10 @@ public HddsProtos.ReplicationType getType() {
     return HddsProtos.ReplicationType.STAND_ALONE;
   }
 
+  public Function<ByteBuffer, ByteString> byteBufferToByteStringConversion(){
+    return ByteStringConversion.createByteBufferConversion(conf);
+  }
+
   /**
    * Get xceiver client metric.
    */

hadoop-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/storage/BlockOutputStream.java

@@ -21,7 +21,6 @@
 import com.google.common.base.Preconditions;
 import org.apache.hadoop.hdds.protocol.DatanodeDetails;
 import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos;
-import org.apache.hadoop.hdds.scm.ByteStringHelper;
 import org.apache.hadoop.hdds.scm.XceiverClientReply;
 import org.apache.hadoop.hdds.scm.container.common.helpers.StorageContainerException;
 import org.apache.hadoop.hdds.scm.pipeline.Pipeline;
@@ -590,7 +589,7 @@ public boolean isClosed() {
    */
   private void writeChunkToContainer(ByteBuffer chunk) throws IOException {
     int effectiveChunkSize = chunk.remaining();
-    ByteString data = ByteStringHelper.getByteString(chunk);
+    ByteString data = bufferPool.byteStringConversion().apply(chunk);
     Checksum checksum = new Checksum(checksumType, bytesPerChecksum);
     ChecksumData checksumData = checksum.computeChecksum(chunk);
     ChunkInfo chunkInfo = ChunkInfo.newBuilder()

hadoop-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/storage/BufferPool.java

@@ -19,10 +19,13 @@
 package org.apache.hadoop.hdds.scm.storage;
 
 import com.google.common.base.Preconditions;
+import org.apache.hadoop.hdds.scm.ByteStringConversion;
+import org.apache.ratis.thirdparty.com.google.protobuf.ByteString;
 
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.function.Function;
 
 /**
  * This class creates and manages pool of n buffers.
@@ -33,12 +36,24 @@ public class BufferPool {
   private int currentBufferIndex;
   private final int bufferSize;
   private final int capacity;
+  private final Function<ByteBuffer, ByteString> byteStringConversion;
 
   public BufferPool(int bufferSize, int capacity) {
+    this(bufferSize, capacity,
+        ByteStringConversion.createByteBufferConversion(null));
+  }
+
+  public BufferPool(int bufferSize, int capacity,
+      Function<ByteBuffer, ByteString> byteStringConversion){
     this.capacity = capacity;
     this.bufferSize = bufferSize;
     bufferList = new ArrayList<>(capacity);
     currentBufferIndex = -1;
+    this.byteStringConversion = byteStringConversion;
+  }
+
+  public Function<ByteBuffer, ByteString> byteStringConversion(){
+    return byteStringConversion;
   }
 
   public ByteBuffer getCurrentBuffer() {

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/scm/ByteStringConversion.java

@@ -0,0 +1,62 @@
+/*
+ * 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.
+ */
+package org.apache.hadoop.hdds.scm;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.ozone.OzoneConfigKeys;
+import org.apache.ratis.thirdparty.com.google.protobuf.ByteString;
+import org.apache.ratis.thirdparty.com.google.protobuf.UnsafeByteOperations;
+
+import java.nio.ByteBuffer;
+import java.util.function.Function;
+
+/**
+ * Helper class to create a conversion function from ByteBuffer to ByteString
+ * based on the property
+ * {@link OzoneConfigKeys#OZONE_UNSAFEBYTEOPERATIONS_ENABLED} in the
+ * Ozone configuration.
+ */
+public final class ByteStringConversion {
+  private ByteStringConversion(){} // no instantiation.
+
+  /**
+   * Creates the conversion function to be used to convert ByteBuffers to
+   * ByteString instances to be used in protobuf messages.
+   *
+   * @param config the Ozone configuration
+   * @return the conversion function defined by
+   *          {@link OzoneConfigKeys#OZONE_UNSAFEBYTEOPERATIONS_ENABLED}
+   * @see <pre>ByteBuffer</pre>
+   */
+  public static Function<ByteBuffer, ByteString> createByteBufferConversion(
+      Configuration config){
+    boolean unsafeEnabled =
+        config!=null && config.getBoolean(
+            OzoneConfigKeys.OZONE_UNSAFEBYTEOPERATIONS_ENABLED,
+            OzoneConfigKeys.OZONE_UNSAFEBYTEOPERATIONS_ENABLED_DEFAULT);
+    if (unsafeEnabled) {
+      return buffer -> UnsafeByteOperations.unsafeWrap(buffer);
+    } else {
+      return buffer -> {
+        ByteString retval = ByteString.copyFrom(buffer);
+        buffer.flip();
+        return retval;
+      };
+    }
+  }
+}

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/keyvalue/KeyValueHandler.java

@@ -27,6 +27,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.locks.ReentrantLock;
+import java.util.function.Function;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.StorageUnit;
@@ -46,7 +47,7 @@
 import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
     .PutSmallFileRequestProto;
 import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos.Type;
-import org.apache.hadoop.hdds.scm.ByteStringHelper;
+import org.apache.hadoop.hdds.scm.ByteStringConversion;
 import org.apache.hadoop.hdds.scm.ScmConfigKeys;
 import org.apache.hadoop.hdds.scm.container.common.helpers
     .StorageContainerException;
@@ -102,6 +103,7 @@ public class KeyValueHandler extends Handler {
   private final ChunkManager chunkManager;
   private final VolumeChoosingPolicy volumeChoosingPolicy;
   private final long maxContainerSize;
+  private final Function<ByteBuffer, ByteString> byteBufferToByteString;
 
   // A lock that is held during container creation.
   private final AutoCloseableLock containerCreationLock;
@@ -125,10 +127,8 @@ public KeyValueHandler(Configuration config, StateContext context,
     // this handler lock is used for synchronizing createContainer Requests,
     // so using a fair lock here.
     containerCreationLock = new AutoCloseableLock(new ReentrantLock(true));
-    boolean isUnsafeByteOperationsEnabled = conf.getBoolean(
-        OzoneConfigKeys.OZONE_UNSAFEBYTEOPERATIONS_ENABLED,
-        OzoneConfigKeys.OZONE_UNSAFEBYTEOPERATIONS_ENABLED_DEFAULT);
-    ByteStringHelper.init(isUnsafeByteOperationsEnabled);
+    byteBufferToByteString =
+        ByteStringConversion.createByteBufferConversion(conf);
   }
 
   @VisibleForTesting
@@ -547,15 +547,15 @@ ContainerCommandResponseProto handleReadChunk(
     }
 
     // The container can become unhealthy after the lock is released.
-    // The operation will likely fail/timeout in that happens.
+    // The operation will likely fail/timeout if that happens.
     try {
       checkContainerIsHealthy(kvContainer);
     } catch (StorageContainerException sce) {
       return ContainerUtils.logAndReturnError(LOG, sce, request);
     }
 
     ChunkInfo chunkInfo;
-    byte[] data;
+    ByteBuffer data;
     try {
       BlockID blockID = BlockID.getFromProtobuf(
           request.getReadChunk().getBlockID());
@@ -569,7 +569,7 @@ ContainerCommandResponseProto handleReadChunk(
 
       data = chunkManager
           .readChunk(kvContainer, blockID, chunkInfo, dispatcherContext);
-      metrics.incContainerBytesStats(Type.ReadChunk, data.length);
+      metrics.incContainerBytesStats(Type.ReadChunk, chunkInfo.getLen());
     } catch (StorageContainerException ex) {
       return ContainerUtils.logAndReturnError(LOG, ex, request);
     } catch (IOException ex) {
@@ -578,7 +578,18 @@ ContainerCommandResponseProto handleReadChunk(
           request);
     }
 
-    return ChunkUtils.getReadChunkResponse(request, data, chunkInfo);
+    Preconditions.checkNotNull(data, "Chunk data is null");
+
+    ContainerProtos.ReadChunkResponseProto.Builder response =
+        ContainerProtos.ReadChunkResponseProto.newBuilder();
+    response.setChunkData(chunkInfo.getProtoBufMessage());
+    response.setData(byteBufferToByteString.apply(data));
+    response.setBlockID(request.getReadChunk().getBlockID());
+
+    ContainerCommandResponseProto.Builder builder =
+        ContainerUtils.getSuccessResponseBuilder(request);
+    builder.setReadChunk(response);
+    return builder.build();
   }
 
   /**
@@ -800,9 +811,9 @@ ContainerCommandResponseProto handleGetSmallFile(
       for (ContainerProtos.ChunkInfo chunk : responseData.getChunks()) {
         // if the block is committed, all chunks must have been committed.
         // Tmp chunk files won't exist here.
-        byte[] data = chunkManager.readChunk(kvContainer, blockID,
+        ByteBuffer data = chunkManager.readChunk(kvContainer, blockID,
             ChunkInfo.getFromProtoBuf(chunk), dispatcherContext);
-        ByteString current = ByteString.copyFrom(data);
+        ByteString current = byteBufferToByteString.apply(data);
         dataBuf = dataBuf.concat(current);
         chunkInfo = chunk;
       }

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/keyvalue/helpers/ChunkUtils.java

@@ -24,9 +24,6 @@
     .ContainerCommandRequestProto;
 import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
     .ContainerCommandResponseProto;
-import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
-    .ReadChunkResponseProto;
-import org.apache.hadoop.hdds.scm.ByteStringHelper;
 import org.apache.hadoop.hdds.scm.container.common.helpers
     .StorageContainerException;
 import org.apache.hadoop.io.IOUtils;
@@ -142,8 +139,7 @@ public static void writeData(File chunkFile, ChunkInfo chunkInfo,
    * @return ByteBuffer
    */
   public static ByteBuffer readData(File chunkFile, ChunkInfo data,
-      VolumeIOStats volumeIOStats) throws StorageContainerException,
-      ExecutionException, InterruptedException {
+      VolumeIOStats volumeIOStats) throws StorageContainerException {
     Logger log = LoggerFactory.getLogger(ChunkManagerImpl.class);
 
     if (!chunkFile.exists()) {
@@ -168,6 +164,7 @@ public static ByteBuffer readData(File chunkFile, ChunkInfo data,
 
         try (FileLock ignored = file.lock(offset, len, true)) {
           file.read(buf, offset);
+          buf.flip();
         }
 
         // Increment volumeIO stats here.
@@ -287,33 +284,6 @@ public static ContainerCommandResponseProto getChunkResponseSuccess(
     return ContainerUtils.getSuccessResponse(msg);
   }
 
-  /**
-   * Gets a response to the read chunk calls.
-   *
-   * @param msg - Msg
-   * @param data - Data
-   * @param info - Info
-   * @return Response.
-   */
-  public static ContainerCommandResponseProto getReadChunkResponse(
-      ContainerCommandRequestProto msg, byte[] data, ChunkInfo info) {
-    Preconditions.checkNotNull(msg);
-    Preconditions.checkNotNull(data, "Chunk data is null");
-    Preconditions.checkNotNull(info, "Chunk Info is null");
-
-    ReadChunkResponseProto.Builder response =
-        ReadChunkResponseProto.newBuilder();
-    response.setChunkData(info.getProtoBufMessage());
-    response.setData(
-        ByteStringHelper.getByteString(data));
-    response.setBlockID(msg.getReadChunk().getBlockID());
-
-    ContainerCommandResponseProto.Builder builder =
-        ContainerUtils.getSuccessResponseBuilder(msg);
-    builder.setReadChunk(response);
-    return builder.build();
-  }
-
   @VisibleForTesting
   static <T, E extends Exception> T processFileExclusively(
       Path path, CheckedSupplier<T, E> op

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/keyvalue/impl/ChunkManagerDummyImpl.java

@@ -120,8 +120,8 @@ public void writeChunk(Container container, BlockID blockID, ChunkInfo info,
    * TODO: Explore if we need to do that for ozone.
    */
   @Override
-  public byte[] readChunk(Container container, BlockID blockID, ChunkInfo info,
-      DispatcherContext dispatcherContext) {
+  public ByteBuffer readChunk(Container container, BlockID blockID,
+      ChunkInfo info, DispatcherContext dispatcherContext) {
 
     long readStartTime = Time.monotonicNow();
 
@@ -138,7 +138,7 @@ public byte[] readChunk(Container container, BlockID blockID, ChunkInfo info,
     volumeIOStats.incReadOpCount();
     volumeIOStats.incReadBytes(info.getLen());
 
-    return data.array();
+    return data;
   }
 
   /**