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From z..@apache.org
Subject hadoop git commit: HADOOP-12259. Utility to Dynamic port allocation (brahmareddy via rkanter)
Date Tue, 18 Oct 2016 17:26:09 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-2.7 d053d1c3f -> bd1676359


HADOOP-12259. Utility to Dynamic port allocation (brahmareddy via rkanter)

(cherry picked from commit ee233ec95ce8cfc8309d3adc072d926cd85eba08)
(cherry picked from commit 731ed9cad81f91e9da18148f0c4757a38ca406f6)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/bd167635
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/bd167635
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/bd167635

Branch: refs/heads/branch-2.7
Commit: bd16763591ec24c7f180353990d1644655968e66
Parents: d053d1c
Author: Robert Kanter <rkanter@apache.org>
Authored: Fri Jul 24 09:41:53 2015 -0700
Committer: Zhe Zhang <zhz@apache.org>
Committed: Tue Oct 18 10:25:52 2016 -0700

----------------------------------------------------------------------
 hadoop-common-project/hadoop-common/CHANGES.txt |  1 +
 .../org/apache/hadoop/net/ServerSocketUtil.java | 63 ++++++++++++++++++++
 2 files changed, 64 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/bd167635/hadoop-common-project/hadoop-common/CHANGES.txt
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index 4f16aa6..ffbc311 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -7,6 +7,7 @@ Release 2.7.4 - UNRELEASED
   NEW FEATURES
 
   IMPROVEMENTS
+    HADOOP-12259. Utility to Dynamic port allocation (brahmareddy via rkanter)
 
   OPTIMIZATIONS
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/bd167635/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/ServerSocketUtil.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/ServerSocketUtil.java
b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/ServerSocketUtil.java
new file mode 100644
index 0000000..0ce835f
--- /dev/null
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/ServerSocketUtil.java
@@ -0,0 +1,63 @@
+/**
+ * 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.net;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.util.Random;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+public class ServerSocketUtil {
+
+  private static final Log LOG = LogFactory.getLog(ServerSocketUtil.class);
+
+  /**
+   * Port scan & allocate is how most other apps find ports
+   * 
+   * @param port given port
+   * @param retries number of retires
+   * @return
+   * @throws IOException
+   */
+  public static int getPort(int port, int retries) throws IOException {
+    Random rand = new Random();
+    int tryPort = port;
+    int tries = 0;
+    while (true) {
+      if (tries > 0) {
+        tryPort = port + rand.nextInt(65535 - port);
+      }
+      LOG.info("Using port " + tryPort);
+      try (ServerSocket s = new ServerSocket(tryPort)) {
+        return tryPort;
+      } catch (IOException e) {
+        tries++;
+        if (tries >= retries) {
+          LOG.info("Port is already in use; giving up");
+          throw e;
+        } else {
+          LOG.info("Port is already in use; trying again");
+        }
+      }
+    }
+  }
+
+}


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