diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
index 333d85f016..e016ba0679 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
@@ -217,3 +217,6 @@
     assigning new tasks. (umamahesh)
 
     HDFS-8367. BlockInfoStriped uses EC schema. (Kai Sasaki via Kai Zheng)
+
+    HDFS-8417. Erasure Coding: Pread failed to read data starting from not-first stripe.
+    (Walter Su via jing9)
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/StripedBlockUtil.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/StripedBlockUtil.java
index c95f0b4e0a..81c0c95d5e 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/StripedBlockUtil.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/StripedBlockUtil.java
@@ -379,7 +379,8 @@ public static AlignedStripe[] divideByteRangeIntoStripes (
     int firstCellIdxInBG = (int) (start / cellSize);
     int lastCellIdxInBG = (int) (end / cellSize);
     int firstCellSize = Math.min(cellSize - (int) (start % cellSize), len);
-    long firstCellOffsetInBlk = start % cellSize;
+    long firstCellOffsetInBlk = firstCellIdxInBG / dataBlkNum * cellSize +
+        start % cellSize;
     int lastCellSize = lastCellIdxInBG == firstCellIdxInBG ?
         firstCellSize : (int) (end % cellSize) + 1;
 
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedInputStream.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedInputStream.java
index 452cc2b9e8..9032d09d68 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedInputStream.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedInputStream.java
@@ -38,6 +38,7 @@
 import org.apache.hadoop.io.erasurecode.ECSchema;
 import org.apache.hadoop.io.erasurecode.rawcoder.RSRawDecoder;
 import org.junit.After;
+import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -115,40 +116,55 @@ public void testPread() throws Exception {
     DFSTestUtil.createStripedFile(cluster, filePath, null, numBlocks,
         NUM_STRIPE_PER_BLOCK, false);
     LocatedBlocks lbs = fs.getClient().namenode.getBlockLocations(
-        filePath.toString(), 0, BLOCK_GROUP_SIZE);
+        filePath.toString(), 0, BLOCK_GROUP_SIZE * numBlocks);
+    int fileLen = BLOCK_GROUP_SIZE * numBlocks;
 
-    assert lbs.get(0) instanceof LocatedStripedBlock;
-    LocatedStripedBlock bg = (LocatedStripedBlock)(lbs.get(0));
-    for (int i = 0; i < DATA_BLK_NUM; i++) {
-      Block blk = new Block(bg.getBlock().getBlockId() + i,
-          NUM_STRIPE_PER_BLOCK * CELLSIZE,
-          bg.getBlock().getGenerationStamp());
-      blk.setGenerationStamp(bg.getBlock().getGenerationStamp());
-      cluster.injectBlocks(i, Arrays.asList(blk),
-          bg.getBlock().getBlockPoolId());
-    }
-    DFSStripedInputStream in =
-        new DFSStripedInputStream(fs.getClient(),
-            filePath.toString(), false, schema);
-    int readSize = BLOCK_GROUP_SIZE;
-    byte[] readBuffer = new byte[readSize];
-    int ret = in.read(0, readBuffer, 0, readSize);
+    byte[] expected = new byte[fileLen];
+    assertEquals(numBlocks, lbs.getLocatedBlocks().size());
+    for (int bgIdx = 0; bgIdx < numBlocks; bgIdx++) {
+      LocatedStripedBlock bg = (LocatedStripedBlock) (lbs.get(bgIdx));
+      for (int i = 0; i < DATA_BLK_NUM; i++) {
+        Block blk = new Block(bg.getBlock().getBlockId() + i,
+            NUM_STRIPE_PER_BLOCK * CELLSIZE,
+            bg.getBlock().getGenerationStamp());
+        blk.setGenerationStamp(bg.getBlock().getGenerationStamp());
+        cluster.injectBlocks(i, Arrays.asList(blk),
+            bg.getBlock().getBlockPoolId());
+      }
 
-    byte[] expected = new byte[readSize];
-    /** A variation of {@link DFSTestUtil#fillExpectedBuf} for striped blocks */
-    for (int i = 0; i < NUM_STRIPE_PER_BLOCK; i++) {
-      for (int j = 0; j < DATA_BLK_NUM; j++) {
-        for (int k = 0; k < CELLSIZE; k++) {
-          int posInBlk = i * CELLSIZE + k;
-          int posInFile = i * CELLSIZE * DATA_BLK_NUM + j * CELLSIZE + k;
-          expected[posInFile] = SimulatedFSDataset.simulatedByte(
-              new Block(bg.getBlock().getBlockId() + j), posInBlk);
+      /** A variation of {@link DFSTestUtil#fillExpectedBuf} for striped blocks */
+      for (int i = 0; i < NUM_STRIPE_PER_BLOCK; i++) {
+        for (int j = 0; j < DATA_BLK_NUM; j++) {
+          for (int k = 0; k < CELLSIZE; k++) {
+            int posInBlk = i * CELLSIZE + k;
+            int posInFile = i * CELLSIZE * DATA_BLK_NUM + j * CELLSIZE + k;
+            expected[bgIdx*BLOCK_GROUP_SIZE + posInFile] =
+                SimulatedFSDataset.simulatedByte(
+                    new Block(bg.getBlock().getBlockId() + j), posInBlk);
+          }
         }
       }
     }
+    DFSStripedInputStream in = new DFSStripedInputStream(fs.getClient(),
+            filePath.toString(), false, schema);
 
-    assertEquals(readSize, ret);
-    assertArrayEquals(expected, readBuffer);
+    int[] startOffsets = {0, 1, CELLSIZE - 102, CELLSIZE, CELLSIZE + 102,
+        CELLSIZE*DATA_BLK_NUM, CELLSIZE*DATA_BLK_NUM + 102,
+        BLOCK_GROUP_SIZE - 102, BLOCK_GROUP_SIZE, BLOCK_GROUP_SIZE + 102,
+        fileLen - 1};
+    for (int startOffset : startOffsets) {
+      startOffset = Math.max(0, Math.min(startOffset, fileLen - 1));
+      int remaining = fileLen - startOffset;
+      byte[] buf = new byte[fileLen];
+      int ret = in.read(startOffset, buf, 0, fileLen);
+      assertEquals(remaining, ret);
+      for (int i = 0; i < remaining; i++) {
+        Assert.assertEquals("Byte at " + (startOffset + i) + " should be the " +
+                "same",
+            expected[startOffset + i], buf[i]);
+      }
+    }
+    in.close();
   }
 
   @Test
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
index 778dd2804c..dd6b600e59 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
@@ -100,7 +100,7 @@ public static void setFactory(Configuration conf) {
 
   public static byte simulatedByte(Block b, long offsetInBlk) {
     byte firstByte = (byte) (b.getBlockId() & BYTE_MASK);
-    return (byte) ((firstByte + offsetInBlk) & BYTE_MASK);
+    return (byte) ((firstByte + offsetInBlk % 29) & BYTE_MASK);
   }
   
   public static final String CONFIG_PROPERTY_CAPACITY =