HADOOP-15507. Add MapReduce counters about EC bytes read.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java

@@ -3605,6 +3605,7 @@ public abstract class FileSystem extends Configured implements Closeable {
       private volatile long bytesReadDistanceOfOneOrTwo;
       private volatile long bytesReadDistanceOfThreeOrFour;
       private volatile long bytesReadDistanceOfFiveOrLarger;
+      private volatile long bytesReadErasureCoded;
 
       /**
        * Add another StatisticsData object to this one.
@@ -3621,6 +3622,7 @@ public abstract class FileSystem extends Configured implements Closeable {
             other.bytesReadDistanceOfThreeOrFour;
         this.bytesReadDistanceOfFiveOrLarger +=
             other.bytesReadDistanceOfFiveOrLarger;
+        this.bytesReadErasureCoded += other.bytesReadErasureCoded;
       }
 
       /**
@@ -3638,6 +3640,7 @@ public abstract class FileSystem extends Configured implements Closeable {
             -this.bytesReadDistanceOfThreeOrFour;
         this.bytesReadDistanceOfFiveOrLarger =
             -this.bytesReadDistanceOfFiveOrLarger;
+        this.bytesReadErasureCoded = -this.bytesReadErasureCoded;
       }
 
       @Override
@@ -3682,6 +3685,10 @@ public abstract class FileSystem extends Configured implements Closeable {
       public long getBytesReadDistanceOfFiveOrLarger() {
         return bytesReadDistanceOfFiveOrLarger;
       }
+
+      public long getBytesReadErasureCoded() {
+        return bytesReadErasureCoded;
+      }
     }
 
     private interface StatisticsAggregator<T> {
@@ -3873,6 +3880,14 @@ public abstract class FileSystem extends Configured implements Closeable {
       getThreadStatistics().writeOps += count;
     }
 
+    /**
+     * Increment the bytes read on erasure-coded files in the statistics.
+     * @param newBytes the additional bytes read
+     */
+    public void incrementBytesReadErasureCoded(long newBytes) {
+      getThreadStatistics().bytesReadErasureCoded += newBytes;
+    }
+
     /**
      * Increment the bytes read by the network distance in the statistics
      * In the common network topology setup, distance value should be an even
@@ -4067,6 +4082,25 @@ public abstract class FileSystem extends Configured implements Closeable {
       });
     }
 
+    /**
+     * Get the total number of bytes read on erasure-coded files.
+     * @return the number of bytes
+     */
+    public long getBytesReadErasureCoded() {
+      return visitAll(new StatisticsAggregator<Long>() {
+        private long bytesReadErasureCoded = 0;
+
+        @Override
+        public void accept(StatisticsData data) {
+          bytesReadErasureCoded += data.bytesReadErasureCoded;
+        }
+
+        public Long aggregate() {
+          return bytesReadErasureCoded;
+        }
+      });
+    }
+
     @Override
     public String toString() {
       return visitAll(new StatisticsAggregator<String>() {

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystemStorageStatistics.java

@@ -46,7 +46,8 @@ public class FileSystemStorageStatistics extends StorageStatistics {
       "bytesReadLocalHost",
       "bytesReadDistanceOfOneOrTwo",
       "bytesReadDistanceOfThreeOrFour",
-      "bytesReadDistanceOfFiveOrLarger"
+      "bytesReadDistanceOfFiveOrLarger",
+      "bytesReadErasureCoded"
   };
 
   private static class LongStatisticIterator
@@ -104,6 +105,8 @@ public class FileSystemStorageStatistics extends StorageStatistics {
       return data.getBytesReadDistanceOfThreeOrFour();
     case "bytesReadDistanceOfFiveOrLarger":
       return data.getBytesReadDistanceOfFiveOrLarger();
+    case "bytesReadErasureCoded":
+      return data.getBytesReadErasureCoded();
     default:
       return null;
     }

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestFileSystemStorageStatistics.java

@@ -51,7 +51,8 @@ public class TestFileSystemStorageStatistics {
       "bytesReadLocalHost",
       "bytesReadDistanceOfOneOrTwo",
       "bytesReadDistanceOfThreeOrFour",
-      "bytesReadDistanceOfFiveOrLarger"
+      "bytesReadDistanceOfFiveOrLarger",
+      "bytesReadErasureCoded"
   };
 
   private FileSystem.Statistics statistics =
@@ -74,6 +75,7 @@ public class TestFileSystemStorageStatistics {
     statistics.incrementBytesReadByDistance(0, RandomUtils.nextInt(100));
     statistics.incrementBytesReadByDistance(1, RandomUtils.nextInt(100));
     statistics.incrementBytesReadByDistance(3, RandomUtils.nextInt(100));
+    statistics.incrementBytesReadErasureCoded(RandomUtils.nextInt(100));
   }
 
   @Test
@@ -126,6 +128,8 @@ public class TestFileSystemStorageStatistics {
       return statistics.getBytesReadByDistance(3);
     case "bytesReadDistanceOfFiveOrLarger":
       return statistics.getBytesReadByDistance(5);
+    case "bytesReadErasureCoded":
+      return statistics.getBytesReadErasureCoded();
     default:
       return 0;
     }

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

@@ -2942,6 +2942,12 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
     }
   }
 
+  void updateFileSystemECReadStats(int nRead) {
+    if (stats != null) {
+      stats.incrementBytesReadErasureCoded(nRead);
+    }
+  }
+
   /**
    * Create hedged reads thread pool, HEDGED_READ_THREAD_POOL, if
    * it does not already exist.

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java

@@ -61,6 +61,7 @@ import org.apache.hadoop.fs.StreamCapabilities;
 import org.apache.hadoop.hdfs.DFSUtilClient.CorruptedBlocks;
 import org.apache.hadoop.hdfs.client.impl.BlockReaderFactory;
 import org.apache.hadoop.hdfs.client.impl.DfsClientConf;
+import org.apache.hadoop.hdfs.protocol.BlockType;
 import org.apache.hadoop.hdfs.protocol.ClientDatanodeProtocol;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
@@ -1082,6 +1083,9 @@ public class DFSInputStream extends FSInputStream
         IOUtilsClient.updateReadStatistics(readStatistics, nread, reader);
         dfsClient.updateFileSystemReadStats(
             reader.getNetworkDistance(), nread);
+        if (readStatistics.getBlockType() == BlockType.STRIPED) {
+          dfsClient.updateFileSystemECReadStats(nread);
+        }
         if (nread != len) {
           throw new IOException("truncated return from reader.read(): " +
               "excpected " + len + ", got " + nread);

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/ReaderStrategy.java

@@ -17,6 +17,8 @@
  */
 package org.apache.hadoop.hdfs;
 
+import org.apache.hadoop.hdfs.protocol.BlockType;
+
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import static org.apache.hadoop.hdfs.util.IOUtilsClient.updateReadStatistics;
@@ -121,6 +123,9 @@ class ByteArrayStrategy implements ReaderStrategy {
       updateReadStatistics(readStatistics, nRead, blockReader);
       dfsClient.updateFileSystemReadStats(blockReader.getNetworkDistance(),
           nRead);
+      if (readStatistics.getBlockType() == BlockType.STRIPED) {
+        dfsClient.updateFileSystemECReadStats(nRead);
+      }
       offset += nRead;
     }
     return nRead;
@@ -188,6 +193,9 @@ class ByteBufferStrategy implements ReaderStrategy {
       updateReadStatistics(readStatistics, nRead, blockReader);
       dfsClient.updateFileSystemReadStats(blockReader.getNetworkDistance(),
           nRead);
+      if (readStatistics.getBlockType() == BlockType.STRIPED) {
+        dfsClient.updateFileSystemECReadStats(nRead);
+      }
     }
 
     return nRead;

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/Task.java

@@ -86,6 +86,7 @@ abstract public class Task implements Writable, Configurable {
 
   public static String MERGED_OUTPUT_PREFIX = ".merged";
   public static final long DEFAULT_COMBINE_RECORDS_BEFORE_PROGRESS = 10000;
+  private static final String HDFS_URI_SCHEME = "hdfs";
   
   /**
    * @deprecated Provided for compatibility. Use {@link TaskCounter} instead.
@@ -1125,7 +1126,8 @@ abstract public class Task implements Writable, Configurable {
   class FileSystemStatisticUpdater {
     private List<FileSystem.Statistics> stats;
     private Counters.Counter readBytesCounter, writeBytesCounter,
-        readOpsCounter, largeReadOpsCounter, writeOpsCounter;
+        readOpsCounter, largeReadOpsCounter, writeOpsCounter,
+        readBytesEcCounter;
     private String scheme;
     FileSystemStatisticUpdater(List<FileSystem.Statistics> stats, String scheme) {
       this.stats = stats;
@@ -1153,23 +1155,33 @@ abstract public class Task implements Writable, Configurable {
         writeOpsCounter = counters.findCounter(scheme,
             FileSystemCounter.WRITE_OPS);
       }
+      if (readBytesEcCounter == null && scheme.equals(HDFS_URI_SCHEME)) {
+        // EC bytes only applies to hdfs
+        readBytesEcCounter =
+            counters.findCounter(scheme, FileSystemCounter.BYTES_READ_EC);
+      }
       long readBytes = 0;
       long writeBytes = 0;
       long readOps = 0;
       long largeReadOps = 0;
       long writeOps = 0;
+      long readBytesEC = 0;
       for (FileSystem.Statistics stat: stats) {
         readBytes = readBytes + stat.getBytesRead();
         writeBytes = writeBytes + stat.getBytesWritten();
         readOps = readOps + stat.getReadOps();
         largeReadOps = largeReadOps + stat.getLargeReadOps();
         writeOps = writeOps + stat.getWriteOps();
+        readBytesEC = readBytesEC + stat.getBytesReadErasureCoded();
       }
       readBytesCounter.setValue(readBytes);
       writeBytesCounter.setValue(writeBytes);
       readOpsCounter.setValue(readOps);
       largeReadOpsCounter.setValue(largeReadOps);
       writeOpsCounter.setValue(writeOps);
+      if (readBytesEcCounter != null) {
+        readBytesEcCounter.setValue(readBytesEC);
+      }
     }
   }
   

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/FileSystemCounter.java

@@ -27,4 +27,5 @@ public enum FileSystemCounter {
   READ_OPS,
   LARGE_READ_OPS,
   WRITE_OPS,
+  BYTES_READ_EC,
 }

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/org/apache/hadoop/mapreduce/FileSystemCounter.properties

@@ -19,3 +19,4 @@ BYTES_WRITTEN.name=   Number of bytes written
 READ_OPS.name=        Number of read operations
 LARGE_READ_OPS.name=  Number of large read operations
 WRITE_OPS.name=       Number of write operations
+BYTES_READ_EC.name=   Number of bytes read erasure-coded