HADOOP-11894. Bump the version of Apache HTrace to 3.2.0-incubating (Masatake Iwasaki via Colin P. McCabe)

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -620,6 +620,9 @@ Release 2.8.0 - UNRELEASED
     HADOOP-12030. test-patch should only report on newly introduced
     findbugs warnings. (Sean Busbey via aw)
 
+    HADOOP-11894. Bump the version of Apache HTrace to 3.2.0-incubating
+    (Masatake Iwasaki via Colin P. McCabe)
+
   OPTIMIZATIONS
 
     HADOOP-11785. Reduce the number of listStatus operation in distcp

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/tracing/SpanReceiverHost.java

@@ -17,33 +17,23 @@
  */
 package org.apache.hadoop.tracing;
 
-import java.io.BufferedReader;
-import java.io.DataInputStream;
-import java.io.EOFException;
-import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
-import java.io.InputStreamReader;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
-import java.util.UUID;
 
-import org.apache.commons.io.Charsets;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.tracing.SpanReceiverInfo.ConfigurationPair;
-import org.apache.hadoop.tracing.TraceUtils;
-import org.apache.hadoop.util.ReflectionUtils;
 import org.apache.hadoop.util.ShutdownHookManager;
 import org.apache.htrace.SpanReceiver;
 import org.apache.htrace.SpanReceiverBuilder;
 import org.apache.htrace.Trace;
+import org.apache.htrace.impl.LocalFileSpanReceiver;
 
 /**
  * This class provides functions for reading the names of SpanReceivers from
@@ -88,33 +78,6 @@ public void run() {
 
   private static List<ConfigurationPair> EMPTY = Collections.emptyList();
 
-  private static String getUniqueLocalTraceFileName() {
-    String tmp = System.getProperty("java.io.tmpdir", "/tmp");
-    String nonce = null;
-    BufferedReader reader = null;
-    try {
-      // On Linux we can get a unique local file name by reading the process id
-      // out of /proc/self/stat.  (There isn't any portable way to get the
-      // process ID from Java.)
-      reader = new BufferedReader(
-          new InputStreamReader(new FileInputStream("/proc/self/stat"),
-                                Charsets.UTF_8));
-      String line = reader.readLine();
-      if (line == null) {
-        throw new EOFException();
-      }
-      nonce = line.split(" ")[0];
-    } catch (IOException e) {
-    } finally {
-      IOUtils.cleanup(LOG, reader);
-    }
-    if (nonce == null) {
-      // If we can't use the process ID, use a random nonce.
-      nonce = UUID.randomUUID().toString();
-    }
-    return new File(tmp, nonce).getAbsolutePath();
-  }
-
   private SpanReceiverHost(String confPrefix) {
     this.confPrefix = confPrefix;
   }
@@ -143,7 +106,7 @@ public synchronized void loadSpanReceivers(Configuration conf) {
     // testing.
     String pathKey = confPrefix + LOCAL_FILE_SPAN_RECEIVER_PATH_SUFFIX;
     if (config.get(pathKey) == null) {
-      String uniqueFile = getUniqueLocalTraceFileName();
+      String uniqueFile = LocalFileSpanReceiver.getUniqueLocalTraceFileName();
       config.set(pathKey, uniqueFile);
       if (LOG.isTraceEnabled()) {
         LOG.trace("Set " + pathKey + " to " + uniqueFile);
@@ -191,7 +154,7 @@ public synchronized void closeReceivers() {
 
   public synchronized SpanReceiverInfo[] listSpanReceivers()
       throws IOException {
-    SpanReceiverInfo info[] = new SpanReceiverInfo[receivers.size()];
+    SpanReceiverInfo[] info = new SpanReceiverInfo[receivers.size()];
     int i = 0;
 
     for(Map.Entry<Long, SpanReceiver> entry : receivers.entrySet()) {

hadoop-common-project/hadoop-common/src/site/markdown/Tracing.md

@@ -78,6 +78,10 @@ You also need to add the jar bundling SpanReceiver to the classpath of Hadoop
 on each node. (LocalFileSpanReceiver in the example above is included in the
 jar of htrace-core which is bundled with Hadoop.)
 
+```
+    $ cp htrace-htraced/target/htrace-htraced-3.2.0-incubating.jar $HADOOP_HOME/share/hadoop/common/lib/
+```
+
 ### Dynamic update of tracing configuration
 
 You can use `hadoop trace` command to see and update the tracing configuration of each servers.
@@ -149,6 +153,7 @@ which start tracing span before invoking HDFS shell command.
     import org.apache.hadoop.conf.Configuration;
     import org.apache.hadoop.fs.FsShell;
     import org.apache.hadoop.hdfs.DFSConfigKeys;
+    import org.apache.hadoop.hdfs.HdfsConfiguration;
     import org.apache.hadoop.tracing.SpanReceiverHost;
     import org.apache.hadoop.util.ToolRunner;
     import org.apache.htrace.Sampler;
@@ -157,19 +162,16 @@ which start tracing span before invoking HDFS shell command.
 
     public class TracingFsShell {
       public static void main(String argv[]) throws Exception {
-        Configuration conf = new Configuration();
+        Configuration conf = new HdfsConfiguration();
         FsShell shell = new FsShell();
         conf.setQuietMode(false);
         shell.setConf(conf);
         SpanReceiverHost.get(conf, DFSConfigKeys.DFS_SERVER_HTRACE_PREFIX);
         int res = 0;
-        TraceScope ts = null;
-        try {
-          ts = Trace.startSpan("FsShell", Sampler.ALWAYS);
+        try (TraceScope ts = Trace.startSpan("FsShell", Sampler.ALWAYS)) {
           res = ToolRunner.run(shell, argv);
         } finally {
           shell.close();
-          if (ts != null) ts.close();
         }
         System.exit(res);
       }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java

@@ -37,7 +37,6 @@
 import java.net.SocketAddress;
 import java.net.URI;
 import java.net.UnknownHostException;
-import java.nio.charset.Charset;
 import java.security.GeneralSecurityException;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -3223,35 +3222,26 @@ public SaslDataTransferClient getSaslDataTransferClient() {
     return saslClient;
   }
 
-  private static final byte[] PATH = "path".getBytes(Charset.forName("UTF-8"));
-
   TraceScope getPathTraceScope(String description, String path) {
     TraceScope scope = Trace.startSpan(description, traceSampler);
     Span span = scope.getSpan();
     if (span != null) {
       if (path != null) {
-        span.addKVAnnotation(PATH,
-            path.getBytes(Charset.forName("UTF-8")));
+        span.addKVAnnotation("path", path);
       }
     }
     return scope;
   }
 
-  private static final byte[] SRC = "src".getBytes(Charset.forName("UTF-8"));
-
-  private static final byte[] DST = "dst".getBytes(Charset.forName("UTF-8"));
-
   TraceScope getSrcDstTraceScope(String description, String src, String dst) {
     TraceScope scope = Trace.startSpan(description, traceSampler);
     Span span = scope.getSpan();
     if (span != null) {
       if (src != null) {
-        span.addKVAnnotation(SRC,
-            src.getBytes(Charset.forName("UTF-8")));
+        span.addKVAnnotation("src", src);
       }
       if (dst != null) {
-        span.addKVAnnotation(DST,
-            dst.getBytes(Charset.forName("UTF-8")));
+        span.addKVAnnotation("dst", dst);
       }
     }
     return scope;

hadoop-project/pom.xml

@@ -798,7 +798,7 @@
       <dependency>
         <groupId>org.apache.htrace</groupId>
         <artifactId>htrace-core</artifactId>
-        <version>3.1.0-incubating</version>
+        <version>3.2.0-incubating</version>
       </dependency>
       <dependency>
         <groupId>org.jdom</groupId>