HDDS-11622. Support domain socket creation

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

@@ -39,6 +39,60 @@ public class OzoneClientConfig {
   private static final Logger LOG =
       LoggerFactory.getLogger(OzoneClientConfig.class);
 
+  public static final boolean OZONE_READ_SHORT_CIRCUIT_DEFAULT = false;
+  public static final String OZONE_DOMAIN_SOCKET_PATH = "ozone.domain.socket.path";
+  public static final String OZONE_DOMAIN_SOCKET_PATH_DEFAULT = "/var/lib/ozone/dn_socket";
+  public static final String SHORT_CIRCUIT_PREFIX = "read.short-circuit.";
+  public static final short DATA_TRANSFER_VERSION = 28;
+  public static final byte DATA_TRANSFER_MAGIC_CODE = 99;
+
+  @Config(key = "read.short-circuit",
+      defaultValue = "false",
+      type = ConfigType.BOOLEAN,
+      description = "Whether read short-circuit is enabled or not",
+      tags = { ConfigTag.CLIENT, ConfigTag.DATANODE })
+  private boolean shortCircuitEnabled = OZONE_READ_SHORT_CIRCUIT_DEFAULT;
+
+  @Config(key = SHORT_CIRCUIT_PREFIX + "buffer.size",
+      defaultValue = "128KB",
+      type = ConfigType.SIZE,
+      description = "Buffer size of reader/writer.",
+      tags = { ConfigTag.CLIENT, ConfigTag.DATANODE })
+  private int shortCircuitBufferSize = 128 * 1024;
+
+  @Config(key = SHORT_CIRCUIT_PREFIX + "disable.interval",
+      defaultValue = "600",
+      type = ConfigType.LONG,
+      description = "If some unknown IO error happens on Domain socket read, short circuit read will be disabled " +
+          "temporarily for this period of time(seconds).",
+      tags = { ConfigTag.CLIENT })
+  private long shortCircuitReadDisableInterval = 60 * 10;
+
+  public boolean isShortCircuitEnabled() {
+    return shortCircuitEnabled;
+  }
+
+  public void setShortCircuit(boolean enabled) {
+    shortCircuitEnabled = enabled;
+  }
+
+
+  public int getShortCircuitBufferSize() {
+    return shortCircuitBufferSize;
+  }
+
+  public void setShortCircuitBufferSize(int size) {
+    this.shortCircuitBufferSize = size;
+  }
+
+  public long getShortCircuitReadDisableInterval() {
+    return shortCircuitReadDisableInterval;
+  }
+
+  public void setShortCircuitReadDisableInterval(long value) {
+    shortCircuitReadDisableInterval = value;
+  }
+
   /**
    * Enum for indicating what mode to use when combining chunk and block
    * checksums to define an aggregate FileChecksum. This should be considered

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

@@ -0,0 +1,111 @@
+/**
+ * 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.storage;
+
+import org.apache.hadoop.net.unix.DomainSocket;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.channels.ReadableByteChannel;
+
+/**
+ * Represents a peer that we communicate with by using blocking I/O
+ * on a UNIX domain socket.
+ */
+public class DomainPeer implements Closeable {
+  private final DomainSocket socket;
+  private final OutputStream out;
+  private final InputStream in;
+  private final ReadableByteChannel channel;
+  public static final Logger LOG = LoggerFactory.getLogger(DomainPeer.class);
+
+  public DomainPeer(DomainSocket socket) {
+    this.socket = socket;
+    this.out = socket.getOutputStream();
+    this.in = socket.getInputStream();
+    this.channel = socket.getChannel();
+  }
+
+  public ReadableByteChannel getInputStreamChannel() {
+    return channel;
+  }
+
+  public void setReadTimeout(int timeoutMs) throws IOException {
+    socket.setAttribute(DomainSocket.RECEIVE_TIMEOUT, timeoutMs);
+  }
+
+  public int getReceiveBufferSize() throws IOException {
+    return socket.getAttribute(DomainSocket.RECEIVE_BUFFER_SIZE);
+  }
+
+  public void setWriteTimeout(int timeoutMs) throws IOException {
+    socket.setAttribute(DomainSocket.SEND_TIMEOUT, timeoutMs);
+  }
+
+  public boolean isClosed() {
+    return !socket.isOpen();
+  }
+
+  public void close() throws IOException {
+    socket.close();
+    LOG.info("{} is closed", socket);
+  }
+
+  public String getRemoteAddressString() {
+    return "unix:{" + socket.toString() + "}";
+  }
+
+  public String getLocalAddressString() {
+    return "<local>";
+  }
+
+  public InputStream getInputStream() throws IOException {
+    return in;
+  }
+
+  public OutputStream getOutputStream() throws IOException {
+    return out;
+  }
+
+  @Override
+  public String toString() {
+    return "DomainPeer(" + getRemoteAddressString() + ")";
+  }
+
+  public DomainSocket getDomainSocket() {
+    return socket;
+  }
+
+  public boolean hasSecureChannel() {
+    //
+    // Communication over domain sockets is assumed to be secure, since it
+    // doesn't pass over any network. We also carefully control the privileges
+    // that can be used on the domain socket inode and its parent directories.
+    // See #{java.org.apache.hadoop.net.unix.DomainSocket#validateSocketPathSecurity0}
+    // for details.
+    //
+    // So unless you are running as root or the user launches the service, you cannot
+    // launch a man-in-the-middle attach on UNIX domain socket traffic.
+    //
+    return true;
+  }
+}