/**
* 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 java.io.File;
import java.io.IOException;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.server.common.GenerationStamp;
import org.apache.hadoop.hdfs.server.common.Storage;
import org.apache.hadoop.hdfs.server.namenode.FSEditLog;
import org.apache.hadoop.hdfs.server.namenode.FSImage;
import org.apache.hadoop.hdfs.server.namenode.INodeDirectory;
import org.apache.hadoop.hdfs.server.namenode.INodeFileUnderConstruction;
import org.apache.hadoop.hdfs.server.namenode.BlocksMap.BlockInfo;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.fs.permission.PermissionStatus;
/**
*
* CreateEditsLog
* Synopsis: CreateEditsLog -f numFiles StartingBlockId numBlocksPerFile
* [-r replicafactor] [-d editsLogDirectory]
* Default replication factor is 1
* Default edits log directory is /tmp/EditsLogOut
*
* Create a name node's edits log in /tmp/EditsLogOut.
* The file /tmp/EditsLogOut/current/edits can be copied to a name node's
* dfs.name.dir/current direcotry and the name node can be started as usual.
*
* The files are created in /createdViaInjectingInEditsLog
* The file names contain the starting and ending blockIds; hence once can
* create multiple edits logs using this command using non overlapping
* block ids and feed the files to a single name node.
*
* See Also @link #DataNodeCluster for injecting a set of matching
* blocks created with this command into a set of simulated data nodes.
*
*/
public class CreateEditsLog {
static final String BASE_PATH = "/createdViaInjectingInEditsLog";
static final String EDITS_DIR = "/tmp/EditsLogOut";
static String edits_dir = EDITS_DIR;
static final public long BLOCK_GENERATION_STAMP =
GenerationStamp.FIRST_VALID_STAMP;
static void addFiles(FSEditLog editLog, int numFiles, short replication,
int blocksPerFile, long startingBlockId,
FileNameGenerator nameGenerator) {
PermissionStatus p = new PermissionStatus("joeDoe", "people",
new FsPermission((short)0777));
INodeDirectory dirInode = new INodeDirectory(p, 0L);
editLog.logMkDir(BASE_PATH, dirInode);
long blockSize = 10;
BlockInfo[] blocks = new BlockInfo[blocksPerFile];
for (int iB = 0; iB < blocksPerFile; ++iB) {
blocks[iB] =
new BlockInfo(new Block(0, blockSize, BLOCK_GENERATION_STAMP),
replication);
}
long currentBlockId = startingBlockId;
long bidAtSync = startingBlockId;
for (int iF = 0; iF < numFiles; iF++) {
for (int iB = 0; iB < blocksPerFile; ++iB) {
blocks[iB].setBlockId(currentBlockId++);
}
try {
INodeFileUnderConstruction inode = new INodeFileUnderConstruction(
null, replication, 0, blockSize, blocks, p, "", "", null);
// Append path to filename with information about blockIDs
String path = "_" + iF + "_B" + blocks[0].getBlockId() +
"_to_B" + blocks[blocksPerFile-1].getBlockId() + "_";
String filePath = nameGenerator.getNextFileName("");
filePath = filePath + path;
// Log the new sub directory in edits
if ((iF % nameGenerator.getFilesPerDirectory()) == 0) {
String currentDir = nameGenerator.getCurrentDir();
dirInode = new INodeDirectory(p, 0L);
editLog.logMkDir(currentDir, dirInode);
}
editLog.logOpenFile(filePath, inode);
editLog.logCloseFile(filePath, inode);
if (currentBlockId - bidAtSync >= 2000) { // sync every 2K blocks
editLog.logSync();
bidAtSync = currentBlockId;
}
} catch (IOException e) {
System.out.println("Creating trascation for file " + iF +
" encountered exception " + e);
}
}
System.out.println("Created edits log in directory " + edits_dir);
System.out.println(" containing " +
numFiles + " File-Creates, each file with " + blocksPerFile + " blocks");
System.out.println(" blocks range: " +
startingBlockId + " to " + (currentBlockId-1));
}
static String usage = "Usage: createditlogs " +
" -f numFiles startingBlockIds NumBlocksPerFile [-r replicafactor] " +
"[-d editsLogDirectory]\n" +
" Default replication factor is 1\n" +
" Default edits log direcory is " + EDITS_DIR + "\n";
static void printUsageExit() {
System.out.println(usage);
System.exit(-1);
}
static void printUsageExit(String err) {
System.out.println(err);
printUsageExit();
}
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
long startingBlockId = 1;
int numFiles = 0;
short replication = 1;
int numBlocksPerFile = 0;
if (args.length == 0) {
printUsageExit();
}
for (int i = 0; i < args.length; i++) { // parse command line
if (args[i].equals("-h"))
printUsageExit();
if (args[i].equals("-f")) {
if (i + 3 >= args.length || args[i+1].startsWith("-") ||
args[i+2].startsWith("-") || args[i+3].startsWith("-")) {
printUsageExit(
"Missing num files, starting block and/or number of blocks");
}
numFiles = Integer.parseInt(args[++i]);
startingBlockId = Integer.parseInt(args[++i]);
numBlocksPerFile = Integer.parseInt(args[++i]);
if (numFiles <=0 || numBlocksPerFile <= 0) {
printUsageExit("numFiles and numBlocksPerFile most be greater than 0");
}
} else if (args[i].equals("-r") || args[i+1].startsWith("-")) {
if (i + 1 >= args.length) {
printUsageExit(
"Missing num files, starting block and/or number of blocks");
}
replication = Short.parseShort(args[++i]);
} else if (args[i].equals("-d")) {
if (i + 1 >= args.length || args[i+1].startsWith("-")) {
printUsageExit("Missing edits logs directory");
}
edits_dir = args[++i];
} else {
printUsageExit();
}
}
File editsLogDir = new File(edits_dir);
File subStructureDir = new File(edits_dir + "/" +
Storage.STORAGE_DIR_CURRENT);
if ( !editsLogDir.exists() ) {
if ( !editsLogDir.mkdir()) {
System.out.println("cannot create " + edits_dir);
System.exit(-1);
}
}
if ( !subStructureDir.exists() ) {
if ( !subStructureDir.mkdir()) {
System.out.println("cannot create subdirs of " + edits_dir);
System.exit(-1);
}
}
FSImage fsImage = new FSImage(new File(edits_dir));
FileNameGenerator nameGenerator = new FileNameGenerator(BASE_PATH, 100);
FSEditLog editLog = fsImage.getEditLog();
editLog.createEditLogFile(fsImage.getFsEditName());
editLog.open();
addFiles(editLog, numFiles, replication, numBlocksPerFile, startingBlockId,
nameGenerator);
editLog.logSync();
editLog.close();
}
}