HBASE-2233 Support both Hadoop 0.20 and 0.22

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1134089 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -255,7 +255,6 @@ Release 0.91.0 - Unreleased
                hbase-1502
    HBASE-3071  Graceful decommissioning of a regionserver
 
-
   NEW FEATURES
    HBASE-2001  Coprocessors: Colocate user code with regions (Mingjie Lai via
                Andrew Purtell)
@@ -285,6 +284,7 @@ Release 0.91.0 - Unreleased
                RS web UIs
    HBASE-3691  Add compressor support for 'snappy', google's compressor
                (Nichole Treadway and Nicholas Telford)
+   HBASE-2233  Support both Hadoop 0.20 and 0.22
 
 
 Release 0.90.4 - Unreleased

src/main/java/org/apache/hadoop/hbase/ipc/ConnectionHeader.java

@@ -33,7 +33,6 @@ import org.apache.hadoop.security.UserGroupInformation;
  */
 class ConnectionHeader implements Writable {
   private String protocol;
-  private UserGroupInformation ugi = null;
 
   public ConnectionHeader() {}
 
@@ -47,7 +46,6 @@ class ConnectionHeader implements Writable {
    */
   public ConnectionHeader(String protocol, UserGroupInformation ugi) {
     this.protocol = protocol;
-    this.ugi = ugi;
   }
 
   @Override
@@ -56,26 +54,11 @@ class ConnectionHeader implements Writable {
     if (protocol.isEmpty()) {
       protocol = null;
     }
-
-    boolean ugiUsernamePresent = in.readBoolean();
-    if (ugiUsernamePresent) {
-      String username = in.readUTF();
-      ugi.readFields(in);
-    } else {
-      ugi = null;
-    }
   }
 
   @Override
   public void write(DataOutput out) throws IOException {
     Text.writeString(out, (protocol == null) ? "" : protocol);
-    if (ugi != null) {
-      //Send both effective user and real user for simple auth
-      out.writeBoolean(true);
-      out.writeUTF(ugi.getUserName());
-    } else {
-      out.writeBoolean(false);
-    }
   }
 
   public String getProtocol() {
@@ -83,10 +66,10 @@ class ConnectionHeader implements Writable {
   }
 
   public UserGroupInformation getUgi() {
-    return ugi;
+    return null;
   }
 
   public String toString() {
-    return protocol + "-" + ugi;
+    return protocol;
   }
 }

src/main/java/org/apache/hadoop/hbase/mapreduce/HFileOutputFormat.java

@@ -45,12 +45,12 @@ import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
 import org.apache.hadoop.hbase.io.hfile.Compression;
 import org.apache.hadoop.hbase.io.hfile.HFile;
-import org.apache.hadoop.hbase.mapreduce.hadoopbackport.TotalOrderPartitioner;
 import org.apache.hadoop.hbase.regionserver.StoreFile;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.io.NullWritable;
 import org.apache.hadoop.io.SequenceFile;
 import org.apache.hadoop.mapreduce.Job;
+import org.apache.hadoop.mapreduce.Partitioner;
 import org.apache.hadoop.mapreduce.RecordWriter;
 import org.apache.hadoop.mapreduce.TaskAttemptContext;
 import org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter;
@@ -271,9 +271,16 @@ public class HFileOutputFormat extends FileOutputFormat<ImmutableBytesWritable,
    * The user should be sure to set the map output value class to either KeyValue or Put before
    * running this function.
    */
-  public static void configureIncrementalLoad(Job job, HTable table) throws IOException {
+  public static void configureIncrementalLoad(Job job, HTable table)
+  throws IOException {
     Configuration conf = job.getConfiguration();
-    job.setPartitionerClass(TotalOrderPartitioner.class);
+    Class<? extends Partitioner> topClass;
+    try {
+      topClass = getTotalOrderPartitionerClass();
+    } catch (ClassNotFoundException e) {
+      throw new IOException("Failed getting TotalOrderPartitioner", e);
+    }
+    job.setPartitionerClass(topClass);
     job.setOutputKeyClass(ImmutableBytesWritable.class);
     job.setOutputValueClass(KeyValue.class);
     job.setOutputFormatClass(HFileOutputFormat.class);
@@ -302,10 +309,14 @@ public class HFileOutputFormat extends FileOutputFormat<ImmutableBytesWritable,
     FileSystem fs = partitionsPath.getFileSystem(conf);
     writePartitions(conf, partitionsPath, startKeys);
     partitionsPath.makeQualified(fs);
+    
     URI cacheUri;
     try {
+      // Below we make explicit reference to the bundled TOP.  Its cheating.
+      // We are assume the define in the hbase bundled TOP is as it is in
+      // hadoop (whether 0.20 or 0.22, etc.)
       cacheUri = new URI(partitionsPath.toString() + "#" +
-          TotalOrderPartitioner.DEFAULT_PATH);
+        org.apache.hadoop.hbase.mapreduce.hadoopbackport.TotalOrderPartitioner.DEFAULT_PATH);
     } catch (URISyntaxException e) {
       throw new IOException(e);
     }
@@ -318,6 +329,27 @@ public class HFileOutputFormat extends FileOutputFormat<ImmutableBytesWritable,
     LOG.info("Incremental table output configured.");
   }
 
+  /**
+   * If > hadoop 0.20, then we want to use the hadoop TotalOrderPartitioner.
+   * If 0.20, then we want to use the TOP that we have under hadoopbackport.
+   * This method is about hbase being able to run on different versions of
+   * hadoop.  In 0.20.x hadoops, we have to use the TOP that is bundled with
+   * hbase.  Otherwise, we use the one in Hadoop.
+   * @return Instance of the TotalOrderPartitioner class
+   * @throws ClassNotFoundException If can't find a TotalOrderPartitioner.
+   */
+  private static Class<? extends Partitioner> getTotalOrderPartitionerClass()
+  throws ClassNotFoundException {
+    Class<? extends Partitioner> clazz = null;
+    try {
+      clazz = (Class<? extends Partitioner>) Class.forName("org.apache.hadoop.mapreduce.lib.partition.TotalOrderPartitioner");
+    } catch (ClassNotFoundException e) {
+      clazz =
+        (Class<? extends Partitioner>) Class.forName("org.apache.hadoop.hbase.mapreduce.hadoopbackport.TotalOrderPartitioner");
+    }
+    return clazz;
+  }
+
   /**
    * Run inside the task to deserialize column family to compression algorithm
    * map from the

src/main/java/org/apache/hadoop/hbase/mapreduce/hadoopbackport/InputSampler.java

@@ -19,6 +19,7 @@
 package org.apache.hadoop.hbase.mapreduce.hadoopbackport;
 
 import java.io.IOException;
+import java.lang.reflect.Constructor;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -132,8 +133,7 @@ public class InputSampler<K,V> extends Configured implements Tool  {
       int samplesPerSplit = numSamples / splitsToSample;
       long records = 0;
       for (int i = 0; i < splitsToSample; ++i) {
-        TaskAttemptContext samplingContext = new TaskAttemptContext(
+        TaskAttemptContext samplingContext = getTaskAttemptContext(job);
-            job.getConfiguration(), new TaskAttemptID());
         RecordReader<K,V> reader = inf.createRecordReader(
             splits.get(i), samplingContext);
         reader.initialize(splits.get(i), samplingContext);
@@ -151,6 +151,32 @@ public class InputSampler<K,V> extends Configured implements Tool  {
     }
   }
 
+  /**
+   * This method is about making hbase portable, making it so it can run on
+   * more than just hadoop 0.20.  In later hadoops, TaskAttemptContext became
+   * an Interface.  But in hadoops where TAC is an Interface, we shouldn't
+   * be using the classes that are in this package; we should be using the
+   * native Hadoop ones (We'll throw a ClassNotFoundException if end up in
+   * here when we should be using native hadoop TotalOrderPartitioner).
+   * @param job
+   * @return
+   * @throws IOException 
+   */
+  public static TaskAttemptContext getTaskAttemptContext(final Job job)
+  throws IOException {
+    Constructor<TaskAttemptContext> c;
+    try {
+      c = TaskAttemptContext.class.getConstructor(Configuration.class, TaskAttemptID.class);
+    } catch (Exception e) {
+      throw new IOException("Failed getting constructor", e);
+    }
+    try {
+      return c.newInstance(job.getConfiguration(), new TaskAttemptID());
+    } catch (Exception e) {
+      throw new IOException("Failed creating instance", e);
+    }
+  }
+
   /**
    * Sample from random points in the input.
    * General-purpose sampler. Takes numSamples / maxSplitsSampled inputs from
@@ -214,8 +240,7 @@ public class InputSampler<K,V> extends Configured implements Tool  {
       // the target sample keyset
       for (int i = 0; i < splitsToSample ||
                      (i < splits.size() && samples.size() < numSamples); ++i) {
-        TaskAttemptContext samplingContext = new TaskAttemptContext(
+        TaskAttemptContext samplingContext = getTaskAttemptContext(job);
-            job.getConfiguration(), new TaskAttemptID());
         RecordReader<K,V> reader = inf.createRecordReader(
             splits.get(i), samplingContext);
         reader.initialize(splits.get(i), samplingContext);
@@ -285,8 +310,7 @@ public class InputSampler<K,V> extends Configured implements Tool  {
       long records = 0;
       long kept = 0;
       for (int i = 0; i < splitsToSample; ++i) {
-        TaskAttemptContext samplingContext = new TaskAttemptContext(
+        TaskAttemptContext samplingContext = getTaskAttemptContext(job);
-            job.getConfiguration(), new TaskAttemptID());
         RecordReader<K,V> reader = inf.createRecordReader(
             splits.get(i), samplingContext);
         reader.initialize(splits.get(i), samplingContext);

src/main/java/org/apache/hadoop/hbase/master/CatalogJanitor.java

@@ -257,6 +257,7 @@ class CatalogJanitor extends Chore {
     for (HColumnDescriptor family: split.getTableDesc().getFamilies()) {
       Path p = Store.getStoreHomedir(tabledir, split.getEncodedName(),
         family.getName());
+      if (!fs.exists(p)) continue;
       // Look for reference files.  Call listStatus with anonymous instance of PathFilter.
       FileStatus [] ps = fs.listStatus(p,
           new PathFilter () {

src/main/java/org/apache/hadoop/hbase/master/HMaster.java

@@ -595,7 +595,7 @@ implements HMasterInterface, HMasterRegionInterface, MasterServices, Server {
    int port = this.conf.getInt("hbase.master.info.port", 60010);
    if (port >= 0) {
      String a = this.conf.get("hbase.master.info.bindAddress", "0.0.0.0");
-     this.infoServer = new InfoServer(MASTER, a, port, false);
+     this.infoServer = new InfoServer(MASTER, a, port, false, this.conf);
      this.infoServer.addServlet("status", "/master-status", MasterStatusServlet.class);
      this.infoServer.setAttribute(MASTER, this);
      this.infoServer.start();

src/main/java/org/apache/hadoop/hbase/master/ServerManager.java

@@ -357,7 +357,7 @@ public class ServerManager {
     boolean carryingRoot;
     try {
       ServerName address = ct.getRootLocation();
-      carryingRoot = address.equals(serverName);
+      carryingRoot = address != null && address.equals(serverName);
     } catch (InterruptedException e) {
       Thread.currentThread().interrupt();
       LOG.info("Interrupted");
@@ -369,7 +369,7 @@ public class ServerManager {
     // has an inmemory list of who has what.  This list will be cleared as we
     // process the dead server but should be  find asking it now.
     ServerName address = ct.getMetaLocation();
-    boolean carryingMeta = address.equals(serverName);
+    boolean carryingMeta = address != null && address.equals(serverName);
     if (carryingRoot || carryingMeta) {
       this.services.getExecutorService().submit(new MetaServerShutdownHandler(this.master,
         this.services, this.deadservers, serverName, carryingRoot, carryingMeta));

src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java

@@ -1288,7 +1288,7 @@ public class HRegionServer implements HRegionInterface, HBaseRPCErrorHandler,
     boolean auto = this.conf.getBoolean("hbase.regionserver.info.port.auto", false);
     while (true) {
       try {
-        this.infoServer = new InfoServer("regionserver", addr, port, false);
+        this.infoServer = new InfoServer("regionserver", addr, port, false, this.conf);
         this.infoServer.addServlet("status", "/rs-status", RSStatusServlet.class); 
         this.infoServer.setAttribute(REGIONSERVER, this);
         this.infoServer.start();

src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java

@@ -48,6 +48,7 @@ import java.util.regex.Pattern;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
@@ -139,7 +140,7 @@ public class HLog implements Syncable {
     HLog.logReaderClass = null;
   }
 
-  private OutputStream hdfs_out;     // OutputStream associated with the current SequenceFile.writer
+  private FSDataOutputStream hdfs_out; // FSDataOutputStream associated with the current SequenceFile.writer
   private int initialReplication; // initial replication factor of SequenceFile.writer
   private Method getNumCurrentReplicas; // refers to DFSOutputStream.getNumCurrentReplicas
   final static Object [] NO_ARGS = new Object []{};
@@ -368,33 +369,42 @@ public class HLog implements Syncable {
     rollWriter();
 
     // handle the reflection necessary to call getNumCurrentReplicas()
-    this.getNumCurrentReplicas = null;
+    this.getNumCurrentReplicas = getGetNumCurrentReplicas(this.hdfs_out);
+
+    logSyncerThread = new LogSyncer(this.optionalFlushInterval);
+    Threads.setDaemonThreadRunning(logSyncerThread,
+        Thread.currentThread().getName() + ".logSyncer");
+    coprocessorHost = new WALCoprocessorHost(this, conf);
+  }
+
+  /**
+   * Find the 'getNumCurrentReplicas' on the passed <code>os</code> stream.
+   * @return Method or null.
+   */
+  private Method getGetNumCurrentReplicas(final FSDataOutputStream os) {
+    Method m = null;
     Exception exception = null;
-    if (this.hdfs_out != null) {
+    if (os != null) {
       try {
-        this.getNumCurrentReplicas = this.hdfs_out.getClass().
+        m = os.getWrappedStream().getClass().
           getMethod("getNumCurrentReplicas", new Class<?> []{});
-        this.getNumCurrentReplicas.setAccessible(true);
+        m.setAccessible(true);
       } catch (NoSuchMethodException e) {
         // Thrown if getNumCurrentReplicas() function isn't available
         exception = e;
       } catch (SecurityException e) {
         // Thrown if we can't get access to getNumCurrentReplicas()
         exception = e;
-        this.getNumCurrentReplicas = null; // could happen on setAccessible()
+        m = null; // could happen on setAccessible()
       }
     }
-    if (this.getNumCurrentReplicas != null) {
+    if (m != null) {
       LOG.info("Using getNumCurrentReplicas--HDFS-826");
     } else {
       LOG.info("getNumCurrentReplicas--HDFS-826 not available; hdfs_out=" +
-        this.hdfs_out + ", exception=" + exception.getMessage());
+        os + ", exception=" + exception.getMessage());
     }
-
+    return m;
-    logSyncerThread = new LogSyncer(this.optionalFlushInterval);
-    Threads.setDaemonThreadRunning(logSyncerThread,
-        Thread.currentThread().getName() + ".logSyncer");
-    coprocessorHost = new WALCoprocessorHost(this, conf);
   }
 
   public void registerWALActionsListener (final WALObserver listener) {
@@ -436,9 +446,15 @@ public class HLog implements Syncable {
     return logSeqNum.get();
   }
 
+  /**
+   * Method used internal to this class and for tests only.
+   * @return The wrapped stream our writer is using; its not the
+   * writer's 'out' FSDatoOutputStream but the stream that this 'out' wraps
+   * (In hdfs its an instance of DFSDataOutputStream).
+   */
   // usage: see TestLogRolling.java
   OutputStream getOutputStream() {
-    return this.hdfs_out;
+    return this.hdfs_out.getWrappedStream();
   }
 
   /**
@@ -482,10 +498,9 @@ public class HLog implements Syncable {
       // Can we get at the dfsclient outputstream?  If an instance of
       // SFLW, it'll have done the necessary reflection to get at the
       // protected field name.
-      OutputStream nextHdfsOut = null;
+      FSDataOutputStream nextHdfsOut = null;
       if (nextWriter instanceof SequenceFileLogWriter) {
-        nextHdfsOut =
+        nextHdfsOut = ((SequenceFileLogWriter)nextWriter).getWriterFSDataOutputStream();
-          ((SequenceFileLogWriter)nextWriter).getDFSCOutputStream();
       }
       // Tell our listeners that a new log was created
       if (!this.listeners.isEmpty()) {
@@ -768,6 +783,7 @@ public class HLog implements Syncable {
    */
   public void closeAndDelete() throws IOException {
     close();
+    if (!fs.exists(this.dir)) return;
     FileStatus[] files = fs.listStatus(this.dir);
     for(FileStatus file : files) {
       Path p = getHLogArchivePath(this.oldLogDir, file.getPath());
@@ -966,8 +982,7 @@ public class HLog implements Syncable {
     }
   }
 
-  @Override
+  private void syncer() throws IOException {
-  public void sync() throws IOException {
     synchronized (this.updateLock) {
       if (this.closed) {
         return;
@@ -1027,9 +1042,10 @@ public class HLog implements Syncable {
    *
    * @throws Exception
    */
-  int getLogReplication() throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
+  int getLogReplication()
-    if(this.getNumCurrentReplicas != null && this.hdfs_out != null) {
+  throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
-      Object repl = this.getNumCurrentReplicas.invoke(this.hdfs_out, NO_ARGS);
+    if (this.getNumCurrentReplicas != null && this.hdfs_out != null) {
+      Object repl = this.getNumCurrentReplicas.invoke(getOutputStream(), NO_ARGS);
       if (repl instanceof Integer) {
         return ((Integer)repl).intValue();
       }
@@ -1042,8 +1058,15 @@ public class HLog implements Syncable {
   }
 
   public void hsync() throws IOException {
-    // Not yet implemented up in hdfs so just call hflush.
+    syncer();
-    sync();
+  }
+
+  public void hflush() throws IOException {
+    syncer();
+  }
+
+  public void sync() throws IOException {
+    syncer();
   }
 
   private void requestLogRoll() {
@@ -1309,7 +1332,9 @@ public class HLog implements Syncable {
   public static NavigableSet<Path> getSplitEditFilesSorted(final FileSystem fs,
       final Path regiondir)
   throws IOException {
+    NavigableSet<Path> filesSorted = new TreeSet<Path>();
     Path editsdir = getRegionDirRecoveredEditsDir(regiondir);
+    if (!fs.exists(editsdir)) return filesSorted;
     FileStatus[] files = fs.listStatus(editsdir, new PathFilter() {
       @Override
       public boolean accept(Path p) {
@@ -1327,7 +1352,6 @@ public class HLog implements Syncable {
         return result;
       }
     });
-    NavigableSet<Path> filesSorted = new TreeSet<Path>();
     if (files == null) return filesSorted;
     for (FileStatus status: files) {
       filesSorted.add(status.getPath());

src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogSplitter.java

@@ -22,7 +22,6 @@ package org.apache.hadoop.hbase.regionserver.wal;
 import static org.apache.hadoop.hbase.util.FSUtils.recoverFileLease;
 
 import java.io.EOFException;
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InterruptedIOException;
 import java.lang.reflect.Constructor;
@@ -44,24 +43,23 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hbase.io.HeapSize;
-import org.apache.hadoop.hbase.master.SplitLogManager.TaskFinisher.Status;
-import org.apache.hadoop.hbase.monitoring.MonitoredTask;
-import org.apache.hadoop.hbase.monitoring.TaskMonitor;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.HTableDescriptor;
 import org.apache.hadoop.hbase.RemoteExceptionHandler;
+import org.apache.hadoop.hbase.io.HeapSize;
+import org.apache.hadoop.hbase.monitoring.MonitoredTask;
+import org.apache.hadoop.hbase.monitoring.TaskMonitor;
 import org.apache.hadoop.hbase.regionserver.HRegion;
 import org.apache.hadoop.hbase.regionserver.wal.HLog.Entry;
 import org.apache.hadoop.hbase.regionserver.wal.HLog.Reader;
 import org.apache.hadoop.hbase.regionserver.wal.HLog.Writer;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.CancelableProgressable;
+import org.apache.hadoop.hbase.util.ClassSize;
 import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
 import org.apache.hadoop.hbase.util.FSUtils;
-import org.apache.hadoop.hbase.util.ClassSize;
-import org.apache.hadoop.io.MultipleIOException;
 import org.apache.hadoop.hbase.zookeeper.ZKSplitLog;
+import org.apache.hadoop.io.MultipleIOException;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
@@ -530,7 +528,7 @@ public class HLogSplitter {
   private static List<FileStatus> listAll(FileSystem fs, Path dir)
   throws IOException {
     List<FileStatus> fset = new ArrayList<FileStatus>(100);
-    FileStatus [] files = fs.listStatus(dir);
+    FileStatus [] files = fs.exists(dir)? fs.listStatus(dir): null;
     if (files != null) {
       for (FileStatus f : files) {
         if (f.isDir()) {

src/main/java/org/apache/hadoop/hbase/regionserver/wal/SequenceFileLogWriter.java

@@ -43,13 +43,15 @@ public class SequenceFileLogWriter implements HLog.Writer {
   private final Log LOG = LogFactory.getLog(this.getClass());
   // The sequence file we delegate to.
   private SequenceFile.Writer writer;
-  // The dfsclient out stream gotten made accessible or null if not available.
+  // This is the FSDataOutputStream instance that is the 'out' instance
-  private OutputStream dfsClient_out;
+  // in the SequenceFile.Writer 'writer' instance above.
-  // The syncFs method from hdfs-200 or null if not available.
+  private FSDataOutputStream writer_out;
-  private Method syncFs;
 
   private Class<? extends HLogKey> keyClass;
 
+  private Method syncFs = null;
+  private Method hflush = null;
+
   /**
    * Default constructor.
    */
@@ -88,9 +90,62 @@ public class SequenceFileLogWriter implements HLog.Writer {
       null,
       new Metadata());
     
+    this.writer_out = getSequenceFilePrivateFSDataOutputStreamAccessible();
+    this.syncFs = getSyncFs();
+    this.hflush = getHFlush();
+    String msg =
+      "syncFs=" + (this.syncFs != null) + ", hflush=" + (this.hflush != null);
+    if (this.syncFs != null || this.hflush != null) {
+      LOG.debug(msg);
+    } else {
+      LOG.warn("No sync support! " + msg);
+    }
+  }
+
+  /**
+   * Now do dirty work to see if syncFs is available on the backing this.writer.
+   * It will be available in branch-0.20-append and in CDH3.
+   * @return The syncFs method or null if not available.
+   * @throws IOException
+   */
+  private Method getSyncFs()
+  throws IOException {
+    Method m = null;
+    try {
+      // function pointer to writer.syncFs() method; present when sync is hdfs-200.
+      m = this.writer.getClass().getMethod("syncFs", new Class<?> []{});
+    } catch (SecurityException e) {
+      throw new IOException("Failed test for syncfs", e);
+    } catch (NoSuchMethodException e) {
+      // Not available
+    }
+    return m;
+  }
+
+  /**
+   * See if hflush (0.21 and 0.22 hadoop) is available.
+   * @return The hflush method or null if not available.
+   * @throws IOException
+   */
+  private Method getHFlush()
+  throws IOException {
+    Method m = null;
+    try {
+      Class<? extends OutputStream> c = getWriterFSDataOutputStream().getClass();
+      m = c.getMethod("hflush", new Class<?> []{});
+    } catch (SecurityException e) {
+      throw new IOException("Failed test for hflush", e);
+    } catch (NoSuchMethodException e) {
+      // Ignore
+    }
+    return m;
+  }
+
   // Get at the private FSDataOutputStream inside in SequenceFile so we can
-    // call sync on it.  Make it accessible.  Stash it aside for call up in
+  // call sync on it.  Make it accessible.
-    // the sync method.
+  private FSDataOutputStream getSequenceFilePrivateFSDataOutputStreamAccessible()
+  throws IOException {
+    FSDataOutputStream out = null;
     final Field fields [] = this.writer.getClass().getDeclaredFields();
     final String fieldName = "out";
     for (int i = 0; i < fields.length; ++i) {
@@ -98,34 +153,17 @@ public class SequenceFileLogWriter implements HLog.Writer {
         try {
           // Make the 'out' field up in SF.Writer accessible.
           fields[i].setAccessible(true);
-          FSDataOutputStream out =
+          out = (FSDataOutputStream)fields[i].get(this.writer);
-            (FSDataOutputStream)fields[i].get(this.writer);
-          this.dfsClient_out = out.getWrappedStream();
           break;
         } catch (IllegalAccessException ex) {
           throw new IOException("Accessing " + fieldName, ex);
-        }
-      }
-    }
-
-    // Now do dirty work to see if syncFs is available.
-    // Test if syncfs is available.
-    Method m = null;
-    boolean append = conf.getBoolean("dfs.support.append", false);
-    if (append) {
-      try {
-        // function pointer to writer.syncFs()
-        m = this.writer.getClass().getMethod("syncFs", new Class<?> []{});
         } catch (SecurityException e) {
-        throw new IOException("Failed test for syncfs", e);
+          // TODO Auto-generated catch block
-      } catch (NoSuchMethodException e) {
+          e.printStackTrace();
-        // Not available
         }
       }
-    this.syncFs = m;
+    }
-    LOG.info((this.syncFs != null)?
+    return out;
-      "Using syncFs -- HDFS-200":
-      ("syncFs -- HDFS-200 -- not available, dfs.support.append=" + append));
   }
 
   @Override
@@ -146,6 +184,12 @@ public class SequenceFileLogWriter implements HLog.Writer {
       } catch (Exception e) {
         throw new IOException("Reflection", e);
       }
+    } else if (this.hflush != null) {
+      try {
+        this.hflush.invoke(getWriterFSDataOutputStream(), HLog.NO_ARGS);
+      } catch (Exception e) {
+        throw new IOException("Reflection", e);
+      }
     }
   }
 
@@ -158,7 +202,7 @@ public class SequenceFileLogWriter implements HLog.Writer {
    * @return The dfsclient out stream up inside SF.Writer made accessible, or
    * null if not available.
    */
-  public OutputStream getDFSCOutputStream() {
+  public FSDataOutputStream getWriterFSDataOutputStream() {
-    return this.dfsClient_out;
+    return this.writer_out;
   }
 }

src/main/java/org/apache/hadoop/hbase/util/FSUtils.java

@@ -737,9 +737,12 @@ public class FSUtils {
       } catch (NoSuchMethodException e) {
         append = false;
       }
-    } else {
+    }
+    if (!append) {
+      // Look for the 0.21, 0.22, new-style append evidence.
       try {
         FSDataOutputStream.class.getMethod("hflush", new Class<?> []{});
+        append = true;
       } catch (NoSuchMethodException e) {
         append = false;
       }

src/main/java/org/apache/hadoop/hbase/util/InfoServer.java

@@ -20,16 +20,19 @@
 
 package org.apache.hadoop.hbase.util;
 
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.net.URL;
+import java.util.Map;
+
+import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HBaseConfiguration;
 import org.apache.hadoop.http.HttpServer;
 import org.mortbay.jetty.handler.ContextHandlerCollection;
 import org.mortbay.jetty.servlet.Context;
 import org.mortbay.jetty.servlet.DefaultServlet;
 
-import java.io.IOException;
-import java.net.URL;
-import java.util.Map;
-
 /**
  * Create a Jetty embedded server to answer http requests. The primary goal
  * is to serve up status information for the server.
@@ -39,6 +42,8 @@ import java.util.Map;
  *   "/" -> the jsp server code from (src/hbase-webapps/<name>)
  */
 public class InfoServer extends HttpServer {
+  private final Configuration config;
+
   /**
    * Create a status server on the given port.
    * The jsp scripts are taken from src/hbase-webapps/<code>name<code>.
@@ -49,15 +54,19 @@ public class InfoServer extends HttpServer {
    * increment by 1 until it finds a free port.
    * @throws IOException e
    */
-  public InfoServer(String name, String bindAddress, int port, boolean findPort)
+  public InfoServer(String name, String bindAddress, int port, boolean findPort,
+      final Configuration c)
   throws IOException {
     super(name, bindAddress, port, findPort, HBaseConfiguration.create());
-    webServer.addHandler(new ContextHandlerCollection());
+    this.config = c;
+    fixupLogsServletLocation();
   }
 
-  protected void addDefaultApps(ContextHandlerCollection parent, String appDir)
+  /**
-  throws IOException {
+   * Fixup where the logs app points, make it point at hbase logs rather than
-    super.addDefaultApps(parent, appDir);
+   * hadoop logs.
+   */
+  private void fixupLogsServletLocation() {
     // Must be same as up in hadoop.
     final String logsContextPath = "/logs";
     // Now, put my logs in place of hadoops... disable old one first.
@@ -72,21 +81,39 @@ public class InfoServer extends HttpServer {
       this.defaultContexts.put(oldLogsContext, Boolean.FALSE);
     }
     // Now do my logs.
-    // set up the context for "/logs/" if "hadoop.log.dir" property is defined.
+    // Set up the context for "/logs/" if "hbase.log.dir" property is defined.
     String logDir = System.getProperty("hbase.log.dir");
     if (logDir != null) {
-      Context logContext = new Context(parent, "/logs");
+      // This is a little presumptious but seems to work.
+      Context logContext =
+        new Context((ContextHandlerCollection)this.webServer.getHandler(),
+          logsContextPath);
       logContext.setResourceBase(logDir);
       logContext.addServlet(DefaultServlet.class, "/");
       defaultContexts.put(logContext, true);
     }
   }
 
+  /**
+   * Get the pathname to the webapps files.
+   * @param appName eg "secondary" or "datanode"
+   * @return the pathname as a URL
+   * @throws FileNotFoundException if 'webapps' directory cannot be found on CLASSPATH.
+   */
+  protected String getWebAppsPath(String appName) throws FileNotFoundException {
+    // Copied from the super-class.
+    URL url = getClass().getClassLoader().getResource("hbase-webapps/" + appName);
+    if (url == null)
+      throw new FileNotFoundException("webapps/" + appName
+          + " not found in CLASSPATH");
+    String urlString = url.toString();
+    return urlString.substring(0, urlString.lastIndexOf('/'));
+  }
+
   /**
    * Get the pathname to the <code>path</code> files.
    * @return the pathname as a URL
    */
-  @Override
   protected String getWebAppsPath() throws IOException {
     // Hack: webapps is not a unique enough element to find in CLASSPATH
     // We'll more than likely find the hadoop webapps dir.  So, instead
@@ -95,29 +122,9 @@ public class InfoServer extends HttpServer {
     // master webapp resides is where we want this InfoServer picking up
     // web applications.
     final String master = "master";
-    String p = getWebAppDir(master);
+    String p = getWebAppsPath(master);
-    // Now strip master + the separator off the end of our context
+    int index = p.lastIndexOf(master);
-    return p.substring(0, p.length() - (master.length() + 1/* The separator*/));
+    // Now strip master off the end if it is present
-  }
+    return index == -1? p: p.substring(0, index);
-
-  private static String getWebAppsPath(final String path)
-  throws IOException {
-    URL url = InfoServer.class.getClassLoader().getResource(path);
-    if (url == null)
-      throw new IOException("hbase-webapps not found in CLASSPATH: " + path);
-    return url.toString();
-  }
-
-  /**
-   * Get the path for this web app
-   * @param webappName web app
-   * @return path
-   * @throws IOException e
-   */
-  public static String getWebAppDir(final String webappName)
-  throws IOException {
-    String webappDir;
-    webappDir = getWebAppsPath("hbase-webapps/" + webappName);
-    return webappDir;
   }
 }

src/test/java/org/apache/hadoop/hbase/HBaseTestingUtility.java

@@ -66,6 +66,7 @@ import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
 import org.apache.hadoop.hdfs.DFSClient;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.mapred.MiniMRCluster;
 import org.apache.zookeeper.ZooKeeper;
@@ -1233,7 +1234,10 @@ public class HBaseTestingUtility {
     Field field = this.dfsCluster.getClass().getDeclaredField("nameNode");
     field.setAccessible(true);
     NameNode nn = (NameNode)field.get(this.dfsCluster);
-    nn.namesystem.leaseManager.setLeasePeriod(100, 50000);
+    field = nn.getClass().getDeclaredField("namesystem");
+    field.setAccessible(true);
+    FSNamesystem namesystem = (FSNamesystem)field.get(nn);
+    namesystem.leaseManager.setLeasePeriod(100, 50000);
   }
 
   /**

src/test/java/org/apache/hadoop/hbase/mapreduce/TestHFileOutputFormat.java

@@ -26,6 +26,7 @@ import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 import java.io.IOException;
+import java.lang.reflect.Constructor;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
@@ -165,7 +166,7 @@ public class TestHFileOutputFormat  {
    */
   @Test
   public void test_LATEST_TIMESTAMP_isReplaced()
-  throws IOException, InterruptedException {
+  throws Exception {
     Configuration conf = new Configuration(this.util.getConfiguration());
     RecordWriter<ImmutableBytesWritable, KeyValue> writer = null;
     TaskAttemptContext context = null;
@@ -174,8 +175,7 @@ public class TestHFileOutputFormat  {
     try {
       Job job = new Job(conf);
       FileOutputFormat.setOutputPath(job, dir);
-      context = new TaskAttemptContext(job.getConfiguration(),
+      context = getTestTaskAttemptContext(job);
-        new TaskAttemptID());
       HFileOutputFormat hof = new HFileOutputFormat();
       writer = hof.getRecordWriter(context);
       final byte [] b = Bytes.toBytes("b");
@@ -203,6 +203,32 @@ public class TestHFileOutputFormat  {
     }
   }
 
+  /**
+   * @return True if the available mapreduce is post-0.20.
+   */
+  private static boolean isPost020MapReduce() {
+    // Here is a coarse test for post 0.20 hadoop; TAC became an interface.
+    return TaskAttemptContext.class.isInterface();
+  }
+
+  private TaskAttemptContext getTestTaskAttemptContext(final Job job)
+  throws IOException, Exception {
+    TaskAttemptContext context;
+    if (isPost020MapReduce()) {
+      TaskAttemptID id =
+        TaskAttemptID.forName("attempt_200707121733_0001_m_000000_0");
+      Class<?> clazz =
+        Class.forName("org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl");
+      Constructor<?> c = clazz.
+          getConstructor(job.getConfiguration().getClass(), TaskAttemptID.class);
+      context = (TaskAttemptContext)c.newInstance(job.getConfiguration(), id);
+    } else {
+      context = org.apache.hadoop.hbase.mapreduce.hadoopbackport.InputSampler.
+        getTaskAttemptContext(job);
+    }
+    return context;
+  }
+
   /**
    * Run small MR job.
    */
@@ -454,8 +480,7 @@ public class TestHFileOutputFormat  {
    * from the column family descriptor
    */
   @Test
-  public void testColumnFamilyCompression()
+  public void testColumnFamilyCompression() throws Exception {
-      throws IOException, InterruptedException {
     Configuration conf = new Configuration(this.util.getConfiguration());
     RecordWriter<ImmutableBytesWritable, KeyValue> writer = null;
     TaskAttemptContext context = null;
@@ -484,8 +509,7 @@ public class TestHFileOutputFormat  {
       setupRandomGeneratorMapper(job);
       HFileOutputFormat.configureIncrementalLoad(job, table);
       FileOutputFormat.setOutputPath(job, dir);
-      context = new TaskAttemptContext(job.getConfiguration(),
+      context = getTestTaskAttemptContext(job);
-          new TaskAttemptID());
       HFileOutputFormat hof = new HFileOutputFormat();
       writer = hof.getRecordWriter(context);
 

src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestHLogSplit.java

@@ -173,9 +173,8 @@ public class TestHLogSplit {
   throws IOException {
     AtomicBoolean stop = new AtomicBoolean(false);
 
-    FileStatus[] stats = fs.listStatus(new Path("/hbase/t1"));
+    assertFalse("Previous test should clean up table dir",
-    assertTrue("Previous test should clean up table dir",
+      fs.exists(new Path("/hbase/t1")));
-        stats == null || stats.length == 0);
 
     generateHLogs(-1);
 
@@ -967,8 +966,7 @@ public class TestHLogSplit {
     HLogSplitter.moveRecoveredEditsFromTemp("tmpdir", hbaseDir, oldLogDir,
         logfile.getPath().toString(), conf);
     Path tdir = HTableDescriptor.getTableDir(hbaseDir, TABLE_NAME);
-    FileStatus [] files = this.fs.listStatus(tdir);
+    assertFalse(fs.exists(tdir));
-    assertTrue(files == null || files.length == 0);
 
     assertEquals(0, countHLog(fs.listStatus(oldLogDir)[0].getPath(), fs, conf));
   }

src/test/java/org/apache/hadoop/hbase/replication/TestReplication.java

@@ -59,6 +59,7 @@ public class TestReplication {
 
   private static Configuration conf1;
   private static Configuration conf2;
+  private static Configuration CONF_WITH_LOCALFS;
 
   private static ZooKeeperWatcher zkw1;
   private static ZooKeeperWatcher zkw2;
@@ -123,7 +124,7 @@ public class TestReplication {
     setIsReplication(true);
 
     LOG.info("Setup second Zk");
-
+    CONF_WITH_LOCALFS = HBaseConfiguration.create(conf1);
     utility1.startMiniCluster(2);
     utility2.startMiniCluster(2);
 
@@ -137,7 +138,6 @@ public class TestReplication {
     HBaseAdmin admin2 = new HBaseAdmin(conf2);
     admin1.createTable(table);
     admin2.createTable(table);
-
     htable1 = new HTable(conf1, tableName);
     htable1.setWriteBufferSize(1024);
     htable2 = new HTable(conf2, tableName);
@@ -476,7 +476,7 @@ public class TestReplication {
     testSmallBatch();
 
     String[] args = new String[] {"2", Bytes.toString(tableName)};
-    Job job = VerifyReplication.createSubmittableJob(conf1, args);
+    Job job = VerifyReplication.createSubmittableJob(CONF_WITH_LOCALFS, args);
     if (job == null) {
       fail("Job wasn't created, see the log");
     }
@@ -500,7 +500,7 @@ public class TestReplication {
     }
     Delete delete = new Delete(put.getRow());
     htable2.delete(delete);
-    job = VerifyReplication.createSubmittableJob(conf1, args);
+    job = VerifyReplication.createSubmittableJob(CONF_WITH_LOCALFS, args);
     if (job == null) {
       fail("Job wasn't created, see the log");
     }

src/test/java/org/apache/hadoop/hbase/util/TestFSUtils.java

@@ -34,7 +34,6 @@ public class TestFSUtils {
     HBaseTestingUtility htu = new HBaseTestingUtility();
     htu.getConfiguration().setBoolean("dfs.support.append", false);
     assertFalse(FSUtils.isHDFS(htu.getConfiguration()));
-    assertFalse(FSUtils.isAppendSupported(htu.getConfiguration()));
     htu.getConfiguration().setBoolean("dfs.support.append", true);
     MiniDFSCluster cluster = null;
     try {