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/*
* 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.
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package org.apache.hadoop.hive.ql.exec;
import org.apache.hadoop.hive.metastore.ReplChangeManager;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.ql.parse.EximUtil;
import org.apache.hadoop.hive.ql.parse.ReplicationSpec;
import org.apache.hadoop.hive.ql.plan.CopyWork;
import org.apache.hadoop.hive.ql.plan.ReplCopyWork;
import org.apache.hadoop.hive.ql.parse.repl.CopyUtils;
import org.apache.hadoop.hive.ql.ErrorMsg;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.common.FileUtils;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.DriverContext;
import org.apache.hadoop.hive.ql.parse.LoadSemanticAnalyzer;
import org.apache.hadoop.hive.ql.plan.api.StageType;
import org.apache.hadoop.util.StringUtils;
public class ReplCopyTask extends Task implements Serializable {
private static final long serialVersionUID = 1L;
private static transient final Logger LOG = LoggerFactory.getLogger(ReplCopyTask.class);
public ReplCopyTask(){
super();
}
@Override
protected int execute(DriverContext driverContext) {
LOG.debug("ReplCopyTask.execute()");
FileSystem dstFs = null;
Path toPath = null;
try {
// Note: CopyWork supports copying multiple files, but ReplCopyWork doesn't.
// Not clear of ReplCopyWork should inherit from CopyWork.
if (work.getFromPaths().length > 1 || work.getToPaths().length > 1) {
throw new RuntimeException("Invalid ReplCopyWork: "
+ work.getFromPaths() + ", " + work.getToPaths());
}
Path fromPath = work.getFromPaths()[0];
toPath = work.getToPaths()[0];
console.printInfo("Copying data from " + fromPath.toString(), " to "
+ toPath.toString());
ReplCopyWork rwork = ((ReplCopyWork)work);
FileSystem srcFs = fromPath.getFileSystem(conf);
dstFs = toPath.getFileSystem(conf);
// This should only be true for copy tasks created from functions, otherwise there should never
// be a CM uri in the from path.
if (ReplChangeManager.isCMFileUri(fromPath)) {
String[] result = ReplChangeManager.decodeFileUri(fromPath.toString());
ReplChangeManager.FileInfo sourceInfo = ReplChangeManager
.getFileInfo(new Path(result[0]), result[1], result[2], result[3], conf);
if (FileUtils.copy(
sourceInfo.getSrcFs(), sourceInfo.getSourcePath(),
dstFs, toPath, false, false, conf)) {
return 0;
} else {
console.printError("Failed to copy: '" + fromPath.toString() + "to: '" + toPath.toString()
+ "'");
return 1;
}
}
List srcFiles = new ArrayList<>();
if (rwork.readSrcAsFilesList()) {
// This flow is usually taken for REPL LOAD
// Our input is the result of a _files listing, we should expand out _files.
srcFiles = filesInFileListing(srcFs, fromPath);
if (LOG.isDebugEnabled()) {
LOG.debug("ReplCopyTask _files contains: {}", (srcFiles == null ? "null" : srcFiles.size()));
}
if ((srcFiles == null) || (srcFiles.isEmpty())) {
if (work.isErrorOnSrcEmpty()) {
console.printError("No _files entry found on source: " + fromPath.toString());
return 5;
} else {
return 0;
}
}
} else {
// This flow is usually taken for IMPORT command
FileStatus[] srcs = LoadSemanticAnalyzer.matchFilesOrDir(srcFs, fromPath);
if (LOG.isDebugEnabled()) {
LOG.debug("ReplCopyTasks srcs= {}", (srcs == null ? "null" : srcs.length));
}
if (srcs == null || srcs.length == 0) {
if (work.isErrorOnSrcEmpty()) {
console.printError("No files matching path: " + fromPath.toString());
return 3;
} else {
return 0;
}
}
for (FileStatus oneSrc : srcs) {
console.printInfo("Copying file: " + oneSrc.getPath().toString());
LOG.debug("ReplCopyTask :cp:{}=>{}", oneSrc.getPath(), toPath);
srcFiles.add(new ReplChangeManager.FileInfo(oneSrc.getPath().getFileSystem(conf),
oneSrc.getPath(), null));
}
}
LOG.debug("ReplCopyTask numFiles: {}", srcFiles.size());
if (!FileUtils.mkdir(dstFs, toPath, conf)) {
console.printError("Cannot make target directory: " + toPath.toString());
return 2;
}
// Copy the files from different source file systems to one destination directory
new CopyUtils(rwork.distCpDoAsUser(), conf).copyAndVerify(dstFs, toPath, srcFiles);
// If a file is copied from CM path, then need to rename them using original source file name
// This is needed to avoid having duplicate files in target if same event is applied twice
// where the first event refers to source path and second event refers to CM path
for (ReplChangeManager.FileInfo srcFile : srcFiles) {
if (srcFile.isUseSourcePath()) {
continue;
}
String destFileName = srcFile.getCmPath().getName();
Path destFile = new Path(toPath, destFileName);
if (dstFs.exists(destFile)) {
String destFileWithSourceName = srcFile.getSourcePath().getName();
Path newDestFile = new Path(toPath, destFileWithSourceName);
boolean result = dstFs.rename(destFile, newDestFile);
if (!result) {
throw new IllegalStateException(
"could not rename " + destFile.getName() + " to " + newDestFile.getName());
}
}
}
return 0;
} catch (Exception e) {
console.printError("Failed with exception " + e.getMessage(), "\n"
+ StringUtils.stringifyException(e));
return ErrorMsg.getErrorMsg(e.getMessage()).getErrorCode();
}
}
private List filesInFileListing(FileSystem fs, Path dataPath)
throws IOException {
Path fileListing = new Path(dataPath, EximUtil.FILES_NAME);
LOG.debug("ReplCopyTask filesInFileListing() reading {}", fileListing.toUri());
if (! fs.exists(fileListing)){
LOG.debug("ReplCopyTask : _files does not exist");
return null; // Returning null from this fn can serve as an err condition.
// On success, but with nothing to return, we can return an empty list.
}
List filePaths = new ArrayList<>();
try (BufferedReader br = new BufferedReader(new InputStreamReader(fs.open(fileListing)))) {
// TODO : verify if skipping charset here is okay
String line;
while ((line = br.readLine()) != null) {
LOG.debug("ReplCopyTask :_filesReadLine: {}", line);
String[] fragments = ReplChangeManager.decodeFileUri(line);
try {
ReplChangeManager.FileInfo f = ReplChangeManager
.getFileInfo(new Path(fragments[0]), fragments[1], fragments[2], fragments[3], conf);
filePaths.add(f);
} catch (MetaException e) {
// issue warning for missing file and throw exception
LOG.warn("Cannot find {} in source repo or cmroot", fragments[0]);
throw new IOException(e.getMessage());
}
// Note - we need srcFs rather than fs, because it is possible that the _files lists files
// which are from a different filesystem than the fs where the _files file itself was loaded
// from. Currently, it is possible, for eg., to do REPL LOAD hdfs:///dir/ and for the _files
// in it to contain hdfs:/// entries, and/or vice-versa, and this causes errors.
// It might also be possible that there will be a mix of them in a given _files file.
// TODO: revisit close to the end of replv2 dev, to see if our assumption now still holds,
// and if not so, optimize.
}
}
return filePaths;
}
@Override
public StageType getType() {
return StageType.COPY;
// there's no extensive need for this to have its own type - it mirrors
// the intent of copy enough. This might change later, though.
}
@Override
public String getName() {
return "REPL_COPY";
}
public static Task getLoadCopyTask(ReplicationSpec replicationSpec, Path srcPath, Path dstPath, HiveConf conf) {
Task copyTask = null;
LOG.debug("ReplCopyTask:getLoadCopyTask: {}=>{}", srcPath, dstPath);
if ((replicationSpec != null) && replicationSpec.isInReplicationScope()){
ReplCopyWork rcwork = new ReplCopyWork(srcPath, dstPath, false);
LOG.debug("ReplCopyTask:\trcwork");
if (replicationSpec.isLazy()) {
LOG.debug("ReplCopyTask:\tlazy");
rcwork.setReadSrcAsFilesList(true);
// It is assumed isLazy flag is set only for REPL LOAD flow.
// IMPORT always do deep copy. So, distCpDoAsUser will be null by default in ReplCopyWork.
String distCpDoAsUser = conf.getVar(HiveConf.ConfVars.HIVE_DISTCP_DOAS_USER);
rcwork.setDistCpDoAsUser(distCpDoAsUser);
}
copyTask = TaskFactory.get(rcwork, conf);
} else {
LOG.debug("ReplCopyTask:\tcwork");
copyTask = TaskFactory.get(new CopyWork(srcPath, dstPath, false), conf);
}
return copyTask;
}
}
