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HDFS-8235. Erasure Coding: Create DFSStripedInputStream in DFSClient#open. Contributed by Kai Sasaki.

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This commit is contained in:
Jing Zhao 2015-04-28 13:42:24 -07:00 committed by Zhe Zhang
parent 5eb17e5726
commit 9593776e34
5 changed files with 28 additions and 16 deletions
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5
hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
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@ -139,4 +139,7 @@
commands from standbynode if any (vinayakumarb)
HDFS-8189. ClientProtocol#createErasureCodingZone API was wrongly annotated
as Idempotent (vinayakumarb)
as Idempotent (vinayakumarb)
HDFS-8235. Erasure Coding: Create DFSStripedInputStream in DFSClient#open.
(Kai Sasaki via jing9)

7
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
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@ -1193,7 +1193,12 @@ public DFSInputStream open(String src, int buffersize, boolean verifyChecksum)
// Get block info from namenode
TraceScope scope = getPathTraceScope("newDFSInputStream", src);
try {
return new DFSInputStream(this, src, verifyChecksum);
ECInfo info = getErasureCodingInfo(src);
if (info != null) {
return new DFSStripedInputStream(this, src, verifyChecksum, info);
} else {
return new DFSInputStream(this, src, verifyChecksum);
}
} finally {
scope.close();
}

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSStripedInputStream.java
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@ -134,11 +134,12 @@ static ReadPortion[] planReadPortions(final int dataBlkNum,
private final short parityBlkNum;
private final ECInfo ecInfo;
DFSStripedInputStream(DFSClient dfsClient, String src, boolean verifyChecksum)
DFSStripedInputStream(DFSClient dfsClient, String src, boolean verifyChecksum, ECInfo info)
throws IOException {
super(dfsClient, src, verifyChecksum);
// ECInfo is restored from NN just before reading striped file.
ecInfo = dfsClient.getErasureCodingInfo(src);
assert info != null;
ecInfo = info;
cellSize = ecInfo.getSchema().getChunkSize();
dataBlkNum = (short)ecInfo.getSchema().getNumDataUnits();
parityBlkNum = (short)ecInfo.getSchema().getNumParityUnits();

16
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedInputStream.java
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@ -18,6 +18,7 @@
package org.apache.hadoop.hdfs;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
@ -167,10 +168,9 @@ private void testOneFileUsingDFSStripedInputStream(String src, int writeBytes)
writeBytes, fileLength);
// pread
try (DFSStripedInputStream dis =
new DFSStripedInputStream(fs.getClient(), src, true)) {
try (FSDataInputStream fsdis = fs.open(new Path(src))) {
byte[] buf = new byte[writeBytes + 100];
int readLen = dis.read(0, buf, 0, buf.length);
int readLen = fsdis.read(0, buf, 0, buf.length);
readLen = readLen >= 0 ? readLen : 0;
Assert.assertEquals("The length of file should be the same to write size",
writeBytes, readLen);
@ -180,13 +180,12 @@ private void testOneFileUsingDFSStripedInputStream(String src, int writeBytes)
}
// stateful read with byte array
try (DFSStripedInputStream dis =
new DFSStripedInputStream(fs.getClient(), src, true)) {
try (FSDataInputStream fsdis = fs.open(new Path(src))) {
byte[] buf = new byte[writeBytes + 100];
int readLen = 0;
int ret;
do {
ret = dis.read(buf, readLen, buf.length - readLen);
ret = fsdis.read(buf, readLen, buf.length - readLen);
if (ret > 0) {
readLen += ret;
}
@ -201,13 +200,12 @@ private void testOneFileUsingDFSStripedInputStream(String src, int writeBytes)
}
// stateful read with ByteBuffer
try (DFSStripedInputStream dis =
new DFSStripedInputStream(fs.getClient(), src, true)) {
try (FSDataInputStream fsdis = fs.open(new Path(src))) {
ByteBuffer buf = ByteBuffer.allocate(writeBytes + 100);
int readLen = 0;
int ret;
do {
ret = dis.read(buf);
ret = fsdis.read(buf);
if (ret > 0) {
readLen += ret;
}

11
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestReadStripedFile.java
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@ -24,6 +24,7 @@
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.IO_FILE_BUFFER_SIZE_KEY;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.ECInfo;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
@ -33,6 +34,7 @@
import static org.junit.Assert.assertTrue;
import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
import org.apache.hadoop.hdfs.server.namenode.ECSchemaManager;
import org.apache.hadoop.hdfs.util.StripedBlockUtil;
import org.junit.After;
import org.junit.Before;
@ -52,6 +54,8 @@ public class TestReadStripedFile {
private DistributedFileSystem fs;
private final Path dirPath = new Path("/striped");
private Path filePath = new Path(dirPath, "file");
private ECInfo info = new ECInfo(filePath.toString(),
ECSchemaManager.getSystemDefaultSchema());
private final short DATA_BLK_NUM = HdfsConstants.NUM_DATA_BLOCKS;
private final short PARITY_BLK_NUM = HdfsConstants.NUM_PARITY_BLOCKS;
private final int CELLSIZE = HdfsConstants.BLOCK_STRIPED_CELL_SIZE;
@ -89,7 +93,7 @@ public void testGetBlock() throws Exception {
LocatedBlocks lbs = fs.getClient().namenode.getBlockLocations(
filePath.toString(), 0, BLOCK_GROUP_SIZE * numBlocks);
final DFSStripedInputStream in =
new DFSStripedInputStream(fs.getClient(), filePath.toString(), false);
new DFSStripedInputStream(fs.getClient(), filePath.toString(), false, info);
List<LocatedBlock> lbList = lbs.getLocatedBlocks();
for (LocatedBlock aLbList : lbList) {
@ -124,7 +128,8 @@ public void testPread() throws Exception {
bg.getBlock().getBlockPoolId());
}
DFSStripedInputStream in =
new DFSStripedInputStream(fs.getClient(), filePath.toString(), false);
new DFSStripedInputStream(fs.getClient(),
filePath.toString(), false, info);
int readSize = BLOCK_GROUP_SIZE;
byte[] readBuffer = new byte[readSize];
int ret = in.read(0, readBuffer, 0, readSize);
@ -170,7 +175,7 @@ private void testStatefulRead(boolean useByteBuffer, boolean cellMisalignPacket)
DFSStripedInputStream in =
new DFSStripedInputStream(fs.getClient(), filePath.toString(),
false);
false, info);
byte[] expected = new byte[fileSize];