/**
* 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.hive.shims;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hive.thrift.DelegationTokenSelector;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.JobContext;
import org.apache.hadoop.mapred.JobStatus;
import org.apache.hadoop.mapred.OutputCommitter;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.RunningJob;
import org.apache.hadoop.mapred.TaskAttemptContext;
import org.apache.hadoop.mapred.TaskCompletionEvent;
import org.apache.hadoop.mapred.TaskID;
import org.apache.hadoop.mapred.lib.CombineFileInputFormat;
import org.apache.hadoop.mapred.lib.CombineFileSplit;
import org.apache.hadoop.mapred.lib.NullOutputFormat;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.TokenIdentifier;
import org.apache.hadoop.security.token.TokenSelector;
import org.apache.hadoop.tools.HadoopArchives;
import org.apache.hadoop.util.ToolRunner;
/**
* Implemention of shims against Hadoop 0.20.0.
*/
public class Hadoop20SShims implements HadoopShims {
public boolean usesJobShell() {
return false;
}
public boolean fileSystemDeleteOnExit(FileSystem fs, Path path)
throws IOException {
return fs.deleteOnExit(path);
}
public void inputFormatValidateInput(InputFormat fmt, JobConf conf)
throws IOException {
// gone in 0.18+
}
public boolean isJobPreparing(RunningJob job) throws IOException {
return job.getJobState() == JobStatus.PREP;
}
/**
* Workaround for hadoop-17 - jobclient only looks at commandlineconfig.
*/
public void setTmpFiles(String prop, String files) {
// gone in 20+
}
public HadoopShims.MiniDFSShim getMiniDfs(Configuration conf,
int numDataNodes,
boolean format,
String[] racks) throws IOException {
return new MiniDFSShim(new MiniDFSCluster(conf, numDataNodes, format, racks));
}
/**
* MiniDFSShim.
*
*/
public class MiniDFSShim implements HadoopShims.MiniDFSShim {
private final MiniDFSCluster cluster;
public MiniDFSShim(MiniDFSCluster cluster) {
this.cluster = cluster;
}
public FileSystem getFileSystem() throws IOException {
return cluster.getFileSystem();
}
public void shutdown() {
cluster.shutdown();
}
}
/**
* We define this function here to make the code compatible between
* hadoop 0.17 and hadoop 0.20.
*
* Hive binary that compiled Text.compareTo(Text) with hadoop 0.20 won't
* work with hadoop 0.17 because in hadoop 0.20, Text.compareTo(Text) is
* implemented in org.apache.hadoop.io.BinaryComparable, and Java compiler
* references that class, which is not available in hadoop 0.17.
*/
public int compareText(Text a, Text b) {
return a.compareTo(b);
}
@Override
public long getAccessTime(FileStatus file) {
return file.getAccessTime();
}
public HadoopShims.CombineFileInputFormatShim getCombineFileInputFormat() {
return new CombineFileInputFormatShim() {
@Override
public RecordReader getRecordReader(InputSplit split,
JobConf job, Reporter reporter) throws IOException {
throw new IOException("CombineFileInputFormat.getRecordReader not needed.");
}
};
}
public static class InputSplitShim extends CombineFileSplit implements HadoopShims.InputSplitShim {
public InputSplitShim() {
super();
}
public InputSplitShim(CombineFileSplit old) throws IOException {
super(old);
}
}
public static class CombineHiveKey implements WritableComparable {
Object key;
public CombineHiveKey(Object key) {
this.key = key;
}
public Object getKey() {
return key;
}
public void setKey(Object key) {
this.key = key;
}
public void write(DataOutput out) throws IOException {
throw new IOException("Method not supported");
}
public void readFields(DataInput in) throws IOException {
throw new IOException("Method not supported");
}
public int compareTo(Object w) {
assert false;
return 0;
}
}
/* This class should be replaced with org.apache.hadoop.mapred.lib.CombineFileRecordReader class, once
* https://issues.apache.org/jira/browse/MAPREDUCE-955 is fixed. This code should be removed - it is a copy
* of org.apache.hadoop.mapred.lib.CombineFileRecordReader
*/
public static class CombineFileRecordReader<K, V> implements RecordReader<K, V> {
static final Class[] constructorSignature = new Class[] {
InputSplit.class,
Configuration.class,
Reporter.class,
Integer.class
};
protected CombineFileSplit split;
protected JobConf jc;
protected Reporter reporter;
protected Class<RecordReader<K, V>> rrClass;
protected Constructor<RecordReader<K, V>> rrConstructor;
protected FileSystem fs;
protected int idx;
protected long progress;
protected RecordReader<K, V> curReader;
public boolean next(K key, V value) throws IOException {
while ((curReader == null) || !curReader.next((K)((CombineHiveKey)key).getKey(), value)) {
if (!initNextRecordReader(key)) {
return false;
}
}
return true;
}
public K createKey() {
K newKey = curReader.createKey();
return (K)(new CombineHiveKey(newKey));
}
public V createValue() {
return curReader.createValue();
}
/**
* Return the amount of data processed.
*/
public long getPos() throws IOException {
return progress;
}
public void close() throws IOException {
if (curReader != null) {
curReader.close();
curReader = null;
}
}
/**
* Return progress based on the amount of data processed so far.
*/
public float getProgress() throws IOException {
return Math.min(1.0f, progress / (float) (split.getLength()));
}
/**
* A generic RecordReader that can hand out different recordReaders
* for each chunk in the CombineFileSplit.
*/
public CombineFileRecordReader(JobConf job, CombineFileSplit split,
Reporter reporter,
Class<RecordReader<K, V>> rrClass)
throws IOException {
this.split = split;
this.jc = job;
this.rrClass = rrClass;
this.reporter = reporter;
this.idx = 0;
this.curReader = null;
this.progress = 0;
try {
rrConstructor = rrClass.getDeclaredConstructor(constructorSignature);
rrConstructor.setAccessible(true);
} catch (Exception e) {
throw new RuntimeException(rrClass.getName() +
" does not have valid constructor", e);
}
initNextRecordReader(null);
}
/**
* Get the record reader for the next chunk in this CombineFileSplit.
*/
protected boolean initNextRecordReader(K key) throws IOException {
if (curReader != null) {
curReader.close();
curReader = null;
if (idx > 0) {
progress += split.getLength(idx - 1); // done processing so far
}
}
// if all chunks have been processed, nothing more to do.
if (idx == split.getNumPaths()) {
return false;
}
// get a record reader for the idx-th chunk
try {
curReader = rrConstructor.newInstance(new Object[]
{split, jc, reporter, Integer.valueOf(idx)});
// change the key if need be
if (key != null) {
K newKey = curReader.createKey();
((CombineHiveKey)key).setKey(newKey);
}
// setup some helper config variables.
jc.set("map.input.file", split.getPath(idx).toString());
jc.setLong("map.input.start", split.getOffset(idx));
jc.setLong("map.input.length", split.getLength(idx));
} catch (Exception e) {
throw new RuntimeException(e);
}
idx++;
return true;
}
}
public abstract static class CombineFileInputFormatShim<K, V> extends
CombineFileInputFormat<K, V>
implements HadoopShims.CombineFileInputFormatShim<K, V> {
public Path[] getInputPathsShim(JobConf conf) {
try {
return FileInputFormat.getInputPaths(conf);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public void createPool(JobConf conf, PathFilter... filters) {
super.createPool(conf, filters);
}
@Override
public InputSplitShim[] getSplits(JobConf job, int numSplits) throws IOException {
long minSize = job.getLong("mapred.min.split.size", 0);
// For backward compatibility, let the above parameter be used
if (job.getLong("mapred.min.split.size.per.node", 0) == 0) {
super.setMinSplitSizeNode(minSize);
}
if (job.getLong("mapred.min.split.size.per.rack", 0) == 0) {
super.setMinSplitSizeRack(minSize);
}
if (job.getLong("mapred.max.split.size", 0) == 0) {
super.setMaxSplitSize(minSize);
}
CombineFileSplit[] splits = (CombineFileSplit[]) super.getSplits(job, numSplits);
InputSplitShim[] isplits = new InputSplitShim[splits.length];
for (int pos = 0; pos < splits.length; pos++) {
isplits[pos] = new InputSplitShim(splits[pos]);
}
return isplits;
}
public InputSplitShim getInputSplitShim() throws IOException {
return new InputSplitShim();
}
public RecordReader getRecordReader(JobConf job, HadoopShims.InputSplitShim split,
Reporter reporter,
Class<RecordReader<K, V>> rrClass)
throws IOException {
CombineFileSplit cfSplit = (CombineFileSplit) split;
return new CombineFileRecordReader(job, cfSplit, reporter, rrClass);
}
}
public String getInputFormatClassName() {
return "org.apache.hadoop.hive.ql.io.CombineHiveInputFormat";
}
String[] ret = new String[2];
@Override
public String[] getTaskJobIDs(TaskCompletionEvent t) {
TaskID tid = t.getTaskAttemptId().getTaskID();
ret[0] = tid.toString();
ret[1] = tid.getJobID().toString();
return ret;
}
public void setFloatConf(Configuration conf, String varName, float val) {
conf.setFloat(varName, val);
}
@Override
public int createHadoopArchive(Configuration conf, Path sourceDir, Path destDir,
String archiveName) throws Exception {
HadoopArchives har = new HadoopArchives(conf);
List<String> args = new ArrayList<String>();
if (conf.get("hive.archive.har.parentdir.settable") == null) {
throw new RuntimeException("hive.archive.har.parentdir.settable is not set");
}
boolean parentSettable =
conf.getBoolean("hive.archive.har.parentdir.settable", false);
if (parentSettable) {
args.add("-archiveName");
args.add(archiveName);
args.add("-p");
args.add(sourceDir.toString());
args.add(destDir.toString());
} else {
args.add("-archiveName");
args.add(archiveName);
args.add(sourceDir.toString());
args.add(destDir.toString());
}
return ToolRunner.run(har, args.toArray(new String[0]));
}
public static class NullOutputCommitter extends OutputCommitter {
@Override
public void setupJob(JobContext jobContext) { }
@Override
public void cleanupJob(JobContext jobContext) { }
@Override
public void setupTask(TaskAttemptContext taskContext) { }
@Override
public boolean needsTaskCommit(TaskAttemptContext taskContext) {
return false;
}
@Override
public void commitTask(TaskAttemptContext taskContext) { }
@Override
public void abortTask(TaskAttemptContext taskContext) { }
}
public void setNullOutputFormat(JobConf conf) {
conf.setOutputFormat(NullOutputFormat.class);
conf.setOutputCommitter(Hadoop20Shims.NullOutputCommitter.class);
// option to bypass job setup and cleanup was introduced in hadoop-21 (MAPREDUCE-463)
// but can be backported. So we disable setup/cleanup in all versions >= 0.19
conf.setBoolean("mapred.committer.job.setup.cleanup.needed", false);
}
@Override
public UserGroupInformation getUGIForConf(Configuration conf) throws IOException {
return UserGroupInformation.getCurrentUser();
}
@Override
public String getTokenStrForm(String tokenSignature) throws IOException {
UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
TokenSelector<? extends TokenIdentifier> tokenSelector = new DelegationTokenSelector();
Token<? extends TokenIdentifier> token = tokenSelector.selectToken(
tokenSignature == null ? new Text() : new Text(tokenSignature), ugi.getTokens());
return token != null ? token.encodeToUrlString() : null;
}
}