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new f940ab2 HDFS-7663. Erasure Coding: Append on striped file.
Contributed by Ayush Saxena.
f940ab2 is described below
commit f940ab242da80a22bae95509d5c282d7e2f7ecdb
Author: Vinayakumar B <vinayakum...@apache.org>
AuthorDate: Tue Mar 5 19:26:42 2019 +0530
HDFS-7663. Erasure Coding: Append on striped file. Contributed by Ayush
Saxena.
---
.../org/apache/hadoop/hdfs/DFSOutputStream.java | 16 +--
.../apache/hadoop/hdfs/DFSStripedOutputStream.java | 20 +++-
.../hadoop/hdfs/server/namenode/FSDirAppendOp.java | 10 +-
.../apache/hadoop/hdfs/TestStripedFileAppend.java | 114 +++++++++++++++++++++
4 files changed, 145 insertions(+), 15 deletions(-)
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
index aaef8ad..a4e0742 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
@@ -119,7 +119,7 @@ public class DFSOutputStream extends FSOutputSummer
protected int packetSize = 0; // write packet size, not including the header.
protected int chunksPerPacket = 0;
protected long lastFlushOffset = 0; // offset when flush was invoked
- private long initialFileSize = 0; // at time of file open
+ protected long initialFileSize = 0; // at time of file open
private final short blockReplication; // replication factor of file
protected boolean shouldSyncBlock = false; // force blocks to disk upon close
private final EnumSet<AddBlockFlag> addBlockFlags;
@@ -391,14 +391,16 @@ public class DFSOutputStream extends FSOutputSummer
EnumSet<CreateFlag> flags, Progressable progress, LocatedBlock lastBlock,
HdfsFileStatus stat, DataChecksum checksum, String[] favoredNodes)
throws IOException {
- if(stat.getErasureCodingPolicy() != null) {
- throw new IOException(
- "Not support appending to a striping layout file yet.");
- }
try (TraceScope ignored =
dfsClient.newPathTraceScope("newStreamForAppend", src)) {
- final DFSOutputStream out = new DFSOutputStream(dfsClient, src, flags,
- progress, lastBlock, stat, checksum, favoredNodes);
+ DFSOutputStream out;
+ if (stat.isErasureCoded()) {
+ out = new DFSStripedOutputStream(dfsClient, src, flags, progress,
+ lastBlock, stat, checksum, favoredNodes);
+ } else {
+ out = new DFSOutputStream(dfsClient, src, flags, progress, lastBlock,
+ stat, checksum, favoredNodes);
+ }
out.start();
return out;
}
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSStripedOutputStream.java
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSStripedOutputStream.java
index 97310ee..ff81995 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSStripedOutputStream.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSStripedOutputStream.java
@@ -276,6 +276,7 @@ public class DFSStripedOutputStream extends DFSOutputStream
private final int numAllBlocks;
private final int numDataBlocks;
private ExtendedBlock currentBlockGroup;
+ private ExtendedBlock prevBlockGroup4Append;
private final String[] favoredNodes;
private final List<StripedDataStreamer> failedStreamers;
private final Map<Integer, Integer> corruptBlockCountMap;
@@ -324,6 +325,16 @@ public class DFSStripedOutputStream extends DFSOutputStream
setCurrentStreamer(0);
}
+ /** Construct a new output stream for appending to a file. */
+ DFSStripedOutputStream(DFSClient dfsClient, String src,
+ EnumSet<CreateFlag> flags, Progressable progress, LocatedBlock lastBlock,
+ HdfsFileStatus stat, DataChecksum checksum, String[] favoredNodes)
+ throws IOException {
+ this(dfsClient, src, stat, flags, progress, checksum, favoredNodes);
+ initialFileSize = stat.getLen(); // length of file when opened
+ prevBlockGroup4Append = lastBlock != null ? lastBlock.getBlock() : null;
+ }
+
private boolean useDirectBuffer() {
return encoder.preferDirectBuffer();
}
@@ -473,12 +484,17 @@ public class DFSStripedOutputStream extends
DFSOutputStream
+ Arrays.asList(excludedNodes));
// replace failed streamers
+ ExtendedBlock prevBlockGroup = currentBlockGroup;
+ if (prevBlockGroup4Append != null) {
+ prevBlockGroup = prevBlockGroup4Append;
+ prevBlockGroup4Append = null;
+ }
replaceFailedStreamers();
LOG.debug("Allocating new block group. The previous block group: "
- + currentBlockGroup);
+ + prevBlockGroup);
final LocatedBlock lb = addBlock(excludedNodes, dfsClient, src,
- currentBlockGroup, fileId, favoredNodes, getAddBlockFlags());
+ prevBlockGroup, fileId, favoredNodes, getAddBlockFlags());
assert lb.isStriped();
// assign the new block to the current block group
currentBlockGroup = lb.getBlock();
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirAppendOp.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirAppendOp.java
index be272d2..6b9fd8b 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirAppendOp.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirAppendOp.java
@@ -107,12 +107,6 @@ final class FSDirAppendOp {
}
final INodeFile file = INodeFile.valueOf(inode, path, true);
- // not support appending file with striped blocks
- if (file.isStriped()) {
- throw new UnsupportedOperationException(
- "Cannot append to files with striped block " + path);
- }
-
BlockManager blockManager = fsd.getBlockManager();
final BlockStoragePolicy lpPolicy = blockManager
.getStoragePolicy("LAZY_PERSIST");
@@ -192,6 +186,10 @@ final class FSDirAppendOp {
LocatedBlock ret = null;
if (!newBlock) {
+ if (file.isStriped()) {
+ throw new UnsupportedOperationException(
+ "Append on EC file without new block is not supported.");
+ }
FSDirectory fsd = fsn.getFSDirectory();
ret = fsd.getBlockManager().convertLastBlockToUnderConstruction(file, 0);
if (ret != null && delta != null) {
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestStripedFileAppend.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestStripedFileAppend.java
new file mode 100644
index 0000000..b4cf102
--- /dev/null
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestStripedFileAppend.java
@@ -0,0 +1,114 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.fs.CreateFlag;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
+import org.apache.log4j.Level;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.EnumSet;
+import java.util.Random;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Tests append on erasure coded file.
+ */
+public class TestStripedFileAppend {
+ public static final Log LOG = LogFactory.getLog(TestStripedFileAppend.class);
+
+ static {
+ DFSTestUtil.setNameNodeLogLevel(Level.ALL);
+ }
+
+ private static final int NUM_DATA_BLOCKS =
+ StripedFileTestUtil.getDefaultECPolicy().getNumDataUnits();
+ private static final int CELL_SIZE =
+ StripedFileTestUtil.getDefaultECPolicy().getCellSize();
+ private static final int NUM_DN = 9;
+ private static final int STRIPES_PER_BLOCK = 4;
+ private static final int BLOCK_SIZE = CELL_SIZE * STRIPES_PER_BLOCK;
+ private static final int BLOCK_GROUP_SIZE = BLOCK_SIZE * NUM_DATA_BLOCKS;
+ private static final Random RANDOM = new Random();
+
+ private MiniDFSCluster cluster;
+ private DistributedFileSystem dfs;
+ private Path dir = new Path("/TestFileAppendStriped");
+ private HdfsConfiguration conf = new HdfsConfiguration();
+
+ @Before
+ public void setup() throws IOException {
+ conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCK_SIZE);
+ cluster = new MiniDFSCluster.Builder(conf).numDataNodes(NUM_DN).build();
+ cluster.waitActive();
+ dfs = cluster.getFileSystem();
+ dfs.mkdirs(dir);
+ dfs.setErasureCodingPolicy(dir, null);
+ }
+
+ @After
+ public void tearDown() throws IOException {
+ if (cluster != null) {
+ cluster.shutdown();
+ }
+ }
+
+ /**
+ * test simple append to a closed striped file, with NEW_BLOCK flag enabled.
+ */
+ @Test
+ public void testAppendToNewBlock() throws IOException {
+ int fileLength = 0;
+ int totalSplit = 6;
+ byte[] expected =
+ StripedFileTestUtil.generateBytes(BLOCK_GROUP_SIZE * totalSplit);
+
+ Path file = new Path(dir, "testAppendToNewBlock");
+ FSDataOutputStream out;
+ for (int split = 0; split < totalSplit; split++) {
+ if (split == 0) {
+ out = dfs.create(file);
+ } else {
+ out = dfs.append(file,
+ EnumSet.of(CreateFlag.APPEND, CreateFlag.NEW_BLOCK), 4096, null);
+ }
+ int splitLength = RANDOM.nextInt(BLOCK_GROUP_SIZE);
+ out.write(expected, fileLength, splitLength);
+ fileLength += splitLength;
+ out.close();
+ }
+ expected = Arrays.copyOf(expected, fileLength);
+ LocatedBlocks lbs =
+ dfs.getClient().getLocatedBlocks(file.toString(), 0L, Long.MAX_VALUE);
+ assertEquals(totalSplit, lbs.getLocatedBlocks().size());
+ StripedFileTestUtil.verifyStatefulRead(dfs, file, fileLength, expected,
+ new byte[4096]);
+ StripedFileTestUtil.verifySeek(dfs, file, fileLength,
+ StripedFileTestUtil.getDefaultECPolicy(), totalSplit);
+ }
+
+}
\ No newline at end of file
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