HDFS-11693. Ozone:Add archive support to containers. Contributed by Anu Engineer.

hadoop-hdfs-project/hadoop-hdfs-client/src/main/proto/DatanodeContainerProtocol.proto

@@ -74,6 +74,8 @@ import "Ozone.proto";
  *  16. GetSmallFile - A single RPC that combines both getKey and ReadChunk.
  *
  *  17. CloseContainer - Closes an open container and makes it immutable.
+ *
+ *  18. CopyContainer - Copies a container from a remote machine.
  */
 
 enum Type {
@@ -128,6 +130,8 @@ enum Result {
   ERROR_CONTAINER_NOT_EMPTY = 23;
   ERROR_IN_COMPACT_DB = 24;
   UNCLOSED_CONTAINER_IO = 25;
+  DELETE_ON_OPEN_CONTAINER = 26;
+  CLOSED_CONTAINER_RETRY = 27;
 }
 
 message ContainerCommandRequestProto {
@@ -382,3 +386,18 @@ message GetSmallFileRequestProto {
 message GetSmallFileResponseProto {
   required ReadChunkResponseProto data = 1;
 }
+
+message CopyContainerRequestProto {
+  required string containerName = 1;
+  required uint64 readOffset = 2;
+  optional uint64 len = 3;
+}
+
+message CopyContainerResponseProto {
+  required string archiveName = 1;
+  required uint64 readOffset = 2;
+  required uint64 len = 3;
+  required bool eof = 4;
+  repeated bytes data = 5;
+  optional int64 checksum = 6;
+}

hadoop-hdfs-project/hadoop-hdfs-client/src/src/test/java/org/apache/hadoop/scm/TestArchive.java

@@ -0,0 +1,106 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.scm;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.lang3.RandomStringUtils;
+import org.apache.hadoop.fs.FileUtil;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Iterator;
+import java.util.Random;
+import java.util.zip.Adler32;
+import java.util.zip.Checksum;
+
+/**
+ * Test archive creation and unpacking.
+ */
+public class TestArchive {
+  private static final int DIR_COUNT = 10;
+  private static final int SUB_DIR_COUNT = 3;
+  private static final int FILE_COUNT = 10;
+  @Rule
+  public TemporaryFolder folder = new TemporaryFolder();
+
+  @Rule
+  public TemporaryFolder outputFolder = new TemporaryFolder();
+
+  Checksum crc = new Adler32();
+
+  @Before
+  public void setUp() throws Exception {
+    Random r = new Random();
+    final int megaByte = 1024 * 1024;
+
+    for (int x = 0; x < DIR_COUNT; x++) {
+      File subdir = folder.newFolder(String.format("dir%d", x));
+      for (int y = 0; y < SUB_DIR_COUNT; y++) {
+        File targetDir = new File(subdir.getPath().concat(File.separator)
+            .concat(String.format("subdir%d%d", x, y)));
+        if(!targetDir.mkdirs()) {
+          throw new IOException("Failed to create subdirectory. " +
+              targetDir.toString());
+        }
+        for (int z = 0; z < FILE_COUNT; z++) {
+          Path temp = Paths.get(targetDir.getPath().concat(File.separator)
+              .concat(String.format("File%d.txt", z)));
+          byte[] buf = RandomStringUtils.randomAlphanumeric(r.nextInt(megaByte))
+              .getBytes("UTF-8");
+          Files.write(temp, buf);
+          crc.update(buf, 0, buf.length);
+        }
+      }
+    }
+  }
+
+  @Test
+  public void testArchive() throws Exception {
+    Checksum readCrc = new Adler32();
+    File archiveFile = new File(outputFolder.getRoot() + File.separator
+        + "test.container.zip");
+    long zipCheckSum = FileUtil.zip(folder.getRoot(), archiveFile);
+    Assert.assertTrue(zipCheckSum > 0);
+    File decomp = new File(outputFolder.getRoot() + File.separator +
+        "decompress");
+    if (!decomp.exists() && !decomp.mkdirs()) {
+      throw new IOException("Unable to create the destination directory. " +
+          decomp.getPath());
+    }
+
+    FileUtil.unZip(archiveFile, decomp);
+    String[] patterns = {"txt"};
+    Iterator<File> iter = FileUtils.iterateFiles(decomp, patterns, true);
+    int count = 0;
+    while (iter.hasNext()) {
+      count++;
+      byte[] buf = Files.readAllBytes(iter.next().toPath());
+      readCrc.update(buf, 0, buf.length);
+    }
+    Assert.assertEquals(DIR_COUNT * SUB_DIR_COUNT * FILE_COUNT, count);
+    Assert.assertEquals(crc.getValue(), readCrc.getValue());
+  }
+}

hadoop-hdfs-project/hadoop-hdfs-client/src/src/test/java/org/apache/hadoop/scm/package-info.java

@@ -0,0 +1,21 @@
+/**
+ * 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.scm;
+/**
+ Test cases for SCM client classes.
+ */