HDFS-8363. Erasure Coding: DFSStripedInputStream#seekToNewSource. (yliu)

hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt

@@ -204,3 +204,5 @@
 
     HDFS-8368. Erasure Coding: DFS opening a non-existent file need to be 
     handled properly (Rakesh R via zhz)
+
+    HDFS-8363. Erasure Coding: DFSStripedInputStream#seekToNewSource. (yliu)

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

@@ -130,12 +130,12 @@ public class DFSStripedInputStream extends DFSInputStream {
     }
   }
 
-  private final short groupSize = HdfsConstants.NUM_DATA_BLOCKS;
-  private final BlockReader[] blockReaders = new BlockReader[groupSize];
-  private final DatanodeInfo[] currentNodes = new DatanodeInfo[groupSize];
+  private final BlockReader[] blockReaders;
+  private final DatanodeInfo[] currentNodes;
   private final int cellSize;
   private final short dataBlkNum;
   private final short parityBlkNum;
+  private final short groupSize;
   /** the buffer for a complete stripe */
   private ByteBuffer curStripeBuf;
   private final ECSchema schema;
@@ -155,6 +155,9 @@ public class DFSStripedInputStream extends DFSInputStream {
     cellSize = schema.getChunkSize();
     dataBlkNum = (short) schema.getNumDataUnits();
     parityBlkNum = (short) schema.getNumParityUnits();
+    groupSize = dataBlkNum;
+    blockReaders = new BlockReader[groupSize];
+    currentNodes = new DatanodeInfo[groupSize];
     curStripeRange = new StripeRange(0, 0);
     readingService =
         new ExecutorCompletionService<>(dfsClient.getStripedReadsThreadPool());
@@ -391,6 +394,12 @@ public class DFSStripedInputStream extends DFSInputStream {
     return (int) (offsetInBlockGroup % stripeLen);
   }
 
+  @Override
+  public synchronized boolean seekToNewSource(long targetPos)
+      throws IOException {
+    return false;
+  }
+
   @Override
   protected synchronized int readWithStrategy(ReaderStrategy strategy,
       int off, int len) throws IOException {