YARN-2937. Fixed new findbugs warnings in hadoop-yarn-nodemanager. Contributed by Varun Saxena.

hadoop-yarn-project/CHANGES.txt

@@ -278,6 +278,9 @@ Release 2.7.0 - UNRELEASED
     YARN-2940. Fix new findbugs warnings in rest of the hadoop-yarn components. (Li Lu 
     via junping_du)
 
+    YARN-2937. Fixed new findbugs warnings in hadoop-yarn-nodemanager. (Varun Saxena
+    via zjshen)
+
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/dev-support/findbugs-exclude.xml

@@ -407,4 +407,14 @@
     <Class name="org.apache.hadoop.yarn.server.timeline.util.LeveldbUtils$KeyParser" />
     <Bug pattern="EI_EXPOSE_REP2" />
   </Match>
+
+  <!-- Ignore unrelated RV_RETURN_VALUE_IGNORED_BAD_PRACTICE warnings. No need to wait for result from executor service -->
+  <Match>
+    <Class name="org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainersLauncher" />
+    <Bug pattern="RV_RETURN_VALUE_IGNORED_BAD_PRACTICE" />
+  </Match>
+  <Match>
+    <Class name="org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.sharedcache.SharedCacheUploadService" />
+    <Bug pattern="RV_RETURN_VALUE_IGNORED_BAD_PRACTICE" />
+  </Match>
 </FindBugsFilter>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/ContainerExecutor.java

@@ -226,7 +226,7 @@ public void writeLaunchEnv(OutputStream out, Map<String, String> environment, Ma
 
     PrintStream pout = null;
     try {
-      pout = new PrintStream(out);
+      pout = new PrintStream(out, false, "UTF-8");
       sb.write(pout);
     } finally {
       if (out != null) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DefaultContainerExecutor.java

@@ -32,12 +32,11 @@
 import java.util.Arrays;
 import java.util.EnumSet;
 import java.util.List;
-import java.util.Random;
 import java.util.Map;
 
+import org.apache.commons.lang.math.RandomUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileContext;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.UnsupportedFileSystemException;
@@ -292,7 +291,7 @@ public void writeLocalWrapperScript(Path launchDst, Path pidFile) throws IOExcep
 
       try {
         out = lfs.create(wrapperScriptPath, EnumSet.of(CREATE, OVERWRITE));
-        pout = new PrintStream(out);
+        pout = new PrintStream(out, false, "UTF-8");
         writeLocalWrapperScript(launchDst, pidFile, pout);
       } finally {
         IOUtils.cleanup(LOG, pout, out);
@@ -345,7 +344,7 @@ private void writeSessionScript(Path launchDst, Path pidFile)
       PrintStream pout = null;
       try {
         out = lfs.create(sessionScriptPath, EnumSet.of(CREATE, OVERWRITE));
-        pout = new PrintStream(out);
+        pout = new PrintStream(out, false, "UTF-8");
         // We need to do a move as writing to a file is not atomic
         // Process reading a file being written to may get garbled data
         // hence write pid to tmp file first followed by a mv
@@ -539,8 +538,7 @@ protected Path getWorkingDir(List<String> localDirs, String user,
 
     // make probability to pick a directory proportional to
     // the available space on the directory.
-    Random r = new Random();
+    long randomPosition = RandomUtils.nextLong() % totalAvailable;
-    long randomPosition = Math.abs(r.nextLong()) % totalAvailable;
     int dir = 0;
     // skip zero available space directory,
     // because totalAvailable is greater than 0 and randomPosition

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DockerContainerExecutor.java

@@ -22,6 +22,8 @@
 import com.google.common.base.Joiner;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
+
+import org.apache.commons.lang.math.RandomUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
@@ -59,7 +61,6 @@
 import java.util.Set;
 import java.util.regex.Pattern;
 import java.net.InetSocketAddress;
-
 import static org.apache.hadoop.fs.CreateFlag.CREATE;
 import static org.apache.hadoop.fs.CreateFlag.OVERWRITE;
 
@@ -310,9 +311,9 @@ public void writeLaunchEnv(OutputStream out, Map<String, String> environment, Ma
     PrintStream ps = null;
     ByteArrayOutputStream baos = new ByteArrayOutputStream();
     try {
-      pout = new PrintStream(out);
+      pout = new PrintStream(out, false, "UTF-8");
       if (LOG.isDebugEnabled()) {
-        ps = new PrintStream(baos);
+        ps = new PrintStream(baos, false, "UTF-8");
         sb.write(ps);
       }
       sb.write(pout);
@@ -326,7 +327,7 @@ public void writeLaunchEnv(OutputStream out, Map<String, String> environment, Ma
       }
     }
     if (LOG.isDebugEnabled()) {
-      LOG.debug("Script: " + baos.toString());
+      LOG.debug("Script: " + baos.toString("UTF-8"));
     }
   }
 
@@ -440,7 +441,7 @@ public void writeLocalWrapperScript(Path launchDst, Path pidFile) throws IOExcep
 
       try {
         out = lfs.create(wrapperScriptPath, EnumSet.of(CREATE, OVERWRITE));
-        pout = new PrintStream(out);
+        pout = new PrintStream(out, false, "UTF-8");
         writeLocalWrapperScript(launchDst, pidFile, pout);
       } finally {
         IOUtils.cleanup(LOG, pout, out);
@@ -498,7 +499,7 @@ private void writeSessionScript(Path launchDst, Path pidFile)
       PrintStream pout = null;
       try {
         out = lfs.create(sessionScriptPath, EnumSet.of(CREATE, OVERWRITE));
-        pout = new PrintStream(out);
+        pout = new PrintStream(out, false, "UTF-8");
         // We need to do a move as writing to a file is not atomic
         // Process reading a file being written to may get garbled data
         // hence write pid to tmp file first followed by a mv
@@ -736,8 +737,7 @@ protected Path getWorkingDir(List<String> localDirs, String user,
 
     // make probability to pick a directory proportional to
     // the available space on the directory.
-    Random r = new Random();
+    long randomPosition = RandomUtils.nextLong() % totalAvailable;
-    long randomPosition = Math.abs(r.nextLong()) % totalAvailable;
     int dir = 0;
     // skip zero available space directory,
     // because totalAvailable is greater than 0 and randomPosition

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LinuxContainerExecutor.java

@@ -301,9 +301,6 @@ public int launchContainer(Container container,
         return ExitCode.TERMINATED.getExitCode();
       }
     } catch (ExitCodeException e) {
-      if (null == shExec) {
-        return -1;
-      }
       int exitCode = shExec.getExitCode();
       LOG.warn("Exit code from container " + containerId + " is : " + exitCode);
       // 143 (SIGTERM) and 137 (SIGKILL) exit codes means the container was

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/WindowsSecureContainerExecutor.java

@@ -29,6 +29,7 @@
 import java.io.PrintStream;
 import java.net.InetSocketAddress;
 import java.net.URISyntaxException;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -501,7 +502,7 @@ public void run() {
           try
           {
             BufferedReader lines = new BufferedReader(
-                new InputStreamReader(stream));
+                new InputStreamReader(stream, Charset.forName("UTF-8")));
             char[] buf = new char[512];
             int nRead;
             while ((nRead = lines.read(buf, 0, buf.length)) > 0) {
@@ -718,7 +719,7 @@ public void startLocalizer(Path nmPrivateContainerTokens,
        }
        catch(Throwable e) {
          LOG.warn(String.format(
-             "An exception occured during the cleanup of localizer job %s:\n%s", 
+             "An exception occured during the cleanup of localizer job %s:%n%s", 
              localizerPid, 
              org.apache.hadoop.util.StringUtils.stringifyException(e)));
        }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/container/ContainerImpl.java

@@ -37,7 +37,6 @@
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.security.Credentials;
-import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.ContainerExitStatus;
 import org.apache.hadoop.yarn.api.records.ContainerId;
 import org.apache.hadoop.yarn.api.records.ContainerLaunchContext;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/util/CgroupsLCEResourcesHandler.java

@@ -20,9 +20,13 @@
 
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileReader;
+import java.io.FileInputStream;
-import java.io.FileWriter;
+import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.io.Writer;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -38,6 +42,7 @@
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileUtil;
+import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.yarn.api.records.ContainerId;
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
@@ -235,7 +240,6 @@ private void createCgroup(String controller, String groupName)
 
   private void updateCgroup(String controller, String groupName, String param,
                             String value) throws IOException {
-    FileWriter f = null;
     String path = pathForCgroup(controller, groupName);
     param = controller + "." + param;
 
@@ -243,19 +247,25 @@ private void updateCgroup(String controller, String groupName, String param,
       LOG.debug("updateCgroup: " + path + ": " + param + "=" + value);
     }
 
+    PrintWriter pw = null;
     try {
-      f = new FileWriter(path + "/" + param, false);
+      File file = new File(path + "/" + param);
-      f.write(value);
+      Writer w = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
+      pw = new PrintWriter(w);
+      pw.write(value);
     } catch (IOException e) {
       throw new IOException("Unable to set " + param + "=" + value +
           " for cgroup at: " + path, e);
     } finally {
-      if (f != null) {
+      if (pw != null) {
-        try {
+        boolean hasError = pw.checkError();
-          f.close();
+        pw.close();
-        } catch (IOException e) {
+        if(hasError) {
-          LOG.warn("Unable to close cgroup file: " +
+          throw new IOException("Unable to set " + param + "=" + value +
-              path, e);
+                " for cgroup at: " + path);
+        }
+        if(pw.checkError()) {
+          throw new IOException("Error while closing cgroup file " + path);
         }
       }
     }
@@ -376,7 +386,8 @@ private Map<String, List<String>> parseMtab() throws IOException {
     BufferedReader in = null;
 
     try {
-      in = new BufferedReader(new FileReader(new File(getMtabFileName())));
+      FileInputStream fis = new FileInputStream(new File(getMtabFileName()));
+      in = new BufferedReader(new InputStreamReader(fis, "UTF-8"));
 
       for (String str = in.readLine(); str != null;
           str = in.readLine()) {
@@ -396,12 +407,7 @@ private Map<String, List<String>> parseMtab() throws IOException {
     } catch (IOException e) {
       throw new IOException("Error while reading " + getMtabFileName(), e);
     } finally {
-      // Close the streams
+      IOUtils.cleanup(LOG, in);
-      try {
-        in.close();
-      } catch (IOException e2) {
-        LOG.warn("Error closing the stream: " + getMtabFileName(), e2);
-      }
     }
 
     return ret;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/util/ProcessIdFileReader.java

@@ -19,8 +19,9 @@
 
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileReader;
+import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStreamReader;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -49,14 +50,14 @@ public static String getProcessId(Path path) throws IOException {
     
     LOG.debug("Accessing pid from pid file " + path);
     String processId = null;
-    FileReader fileReader = null;
     BufferedReader bufReader = null;
 
     try {
       File file = new File(path.toString());
       if (file.exists()) {
-        fileReader = new FileReader(file);
+        FileInputStream fis = new FileInputStream(file);
-        bufReader = new BufferedReader(fileReader);
+        bufReader = new BufferedReader(new InputStreamReader(fis, "UTF-8"));
+
         while (true) {
           String line = bufReader.readLine();
           if (line == null) {
@@ -91,9 +92,6 @@ public static String getProcessId(Path path) throws IOException {
         }
       }
     } finally {
-      if (fileReader != null) {
-        fileReader.close();
-      }
       if (bufReader != null) {
         bufReader.close();
       }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/webapp/ContainerLogsPage.java

@@ -28,6 +28,7 @@
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.nio.charset.Charset;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
@@ -151,7 +152,8 @@ private void printLogFile(Block html, File logFile) {
           }
           
           IOUtils.skipFully(logByteStream, start);
-          InputStreamReader reader = new InputStreamReader(logByteStream);
+          InputStreamReader reader =
+              new InputStreamReader(logByteStream, Charset.forName("UTF-8"));
           int bufferSize = 65536;
           char[] cbuf = new char[bufferSize];