HDFS-9669. TcpPeerServer should respect ipc.server.listen.queue.size (Elliot Clark via cmccabe)

(cherry picked from commit 2da03b48eb)
(cherry picked from commit 60d3a3c30b)

Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -1722,6 +1722,9 @@ Release 2.7.3 - UNRELEASED
 
     HDFS-9654. Code refactoring for HDFS-8578.  (szetszwo)
 
+    HDFS-9669. TcpPeerServer should respect ipc.server.listen.queue.size
+    (Elliot Clark via cmccabe)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/net/TcpPeerServer.java

@@ -41,13 +41,15 @@ public class TcpPeerServer implements PeerServer {
    *
    * @param socketWriteTimeout    The Socket write timeout in ms.
    * @param bindAddr              The address to bind to.
+   * @param backlogLength         The length of the tcp accept backlog
    * @throws IOException
    */
   public TcpPeerServer(int socketWriteTimeout,
-        InetSocketAddress bindAddr) throws IOException {
+                       InetSocketAddress bindAddr,
+                       int backlogLength) throws IOException {
     this.serverSocket = (socketWriteTimeout > 0) ?
           ServerSocketChannel.open().socket() : new ServerSocket();
-    Server.bind(serverSocket, bindAddr, 0);
+    Server.bind(serverSocket, bindAddr, backlogLength);
   }
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java

@@ -49,6 +49,7 @@ import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_MAX_NUM_BLOCKS_TO_LOG_KEY
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_METRICS_LOGGER_PERIOD_SECONDS_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_METRICS_LOGGER_PERIOD_SECONDS_KEY;
 import static org.apache.hadoop.util.ExitUtil.terminate;
+import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 
 import java.io.BufferedOutputStream;
 import java.io.ByteArrayInputStream;
@@ -1010,8 +1011,11 @@ public class DataNode extends ReconfigurableBase
     if (secureResources != null) {
       tcpPeerServer = new TcpPeerServer(secureResources);
     } else {
+      int backlogLength = conf.getInt(
+          CommonConfigurationKeysPublic.IPC_SERVER_LISTEN_QUEUE_SIZE_KEY,
+          CommonConfigurationKeysPublic.IPC_SERVER_LISTEN_QUEUE_SIZE_DEFAULT);
       tcpPeerServer = new TcpPeerServer(dnConf.socketWriteTimeout,
-          DataNode.getStreamingAddr(conf));
+          DataNode.getStreamingAddr(conf), backlogLength);
     }
     if (dnConf.getTransferSocketRecvBufferSize() > 0) {
       tcpPeerServer.setReceiveBufferSize(

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/SecureDataNodeStarter.java

@@ -20,6 +20,7 @@ import com.google.common.annotations.VisibleForTesting;
 import org.apache.commons.daemon.Daemon;
 import org.apache.commons.daemon.DaemonContext;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
@@ -95,10 +96,13 @@ public class SecureDataNodeStarter implements Daemon {
     int socketWriteTimeout = conf.getInt(
         DFSConfigKeys.DFS_DATANODE_SOCKET_WRITE_TIMEOUT_KEY,
         HdfsConstants.WRITE_TIMEOUT);
+    int backlogLength = conf.getInt(
+        CommonConfigurationKeysPublic.IPC_SERVER_LISTEN_QUEUE_SIZE_KEY,
+        CommonConfigurationKeysPublic.IPC_SERVER_LISTEN_QUEUE_SIZE_DEFAULT);
 
     ServerSocket ss = (socketWriteTimeout > 0) ? 
         ServerSocketChannel.open().socket() : new ServerSocket();
-    ss.bind(streamingAddr, 0);
+    ss.bind(streamingAddr, backlogLength);
 
     // Check that we got the port we need
     if (ss.getLocalPort() != streamingAddr.getPort()) {