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HDFS-8417. Erasure Coding: Pread failed to read data starting from not-first stripe. Contributed by Walter Su.

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This commit is contained in:
Jing Zhao 2015-05-18 15:08:30 -07:00 committed by Zhe Zhang
parent 343c0e76fc
commit 6c310db159
4 changed files with 50 additions and 30 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
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@ -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)

3
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/StripedBlockUtil.java
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@ -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;

42
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedInputStream.java
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@ -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;
@ -115,10 +116,13 @@ 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));
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,
@ -127,28 +131,40 @@ public void testPread() throws Exception {
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[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(
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

2
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
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@ -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 =