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TapDataWriter.java
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/
TapDataWriter.java
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/**
* Copyright (C) 2014-2019 Expedia Inc.
*
* Licensed 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 com.hotels.plunger;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.JobConf;
import cascading.cascade.Cascade;
import cascading.flow.Flow;
import cascading.flow.FlowElement;
import cascading.flow.FlowNode;
import cascading.flow.FlowStep;
import cascading.flow.FlowStepListener;
import cascading.flow.hadoop.HadoopFlowProcess;
import cascading.flow.hadoop.util.HadoopUtil;
import cascading.flow.local.LocalFlowProcess;
import cascading.flow.planner.graph.ElementGraph;
import cascading.flow.planner.process.FlowNodeGraph;
import cascading.management.state.ClientState;
import cascading.pipe.Group;
import cascading.stats.CascadingStats;
import cascading.stats.FlowStepStats;
import cascading.stats.local.LocalStepStats;
import cascading.tap.Tap;
import cascading.tap.hadoop.util.Hadoop18TapUtil;
import cascading.tap.partition.BasePartitionTap;
import cascading.tuple.Tuple;
import cascading.tuple.TupleEntry;
import cascading.tuple.TupleEntryCollector;
/**
* Writes a {@link Data} instance to a {@link Tap}. Currently works only with hadoop and local taps.
* <p/>
* <strong>WARNING:</strong> This is exceedingly brittle as it relies on cascading internals.
*/
public class TapDataWriter {
private final Data data;
TapDataWriter(Data data) {
this.data = data;
}
/** Writes the {@link Tuple Tuples} provided in the {@link Data} instance to the supplied {@link Tap}. */
public Tap<?, ?, ?> toTap(Tap<?, ?, ?> tap) throws IOException {
Class<?> tapConfigClass = TapTypeUtil.getTapConfigClass(tap);
if (Configuration.class.equals(tapConfigClass)) {
if (tap instanceof BasePartitionTap) {
writeToHadoopPartitionTap(tap);
} else {
writeToHadoopTap(tap);
}
} else if (Properties.class.equals(tapConfigClass)) {
writeToLocalTap(tap);
} else {
throw new IllegalArgumentException("Unsupported tap type: " + tap.getClass());
}
return tap;
}
/* WARNING: This is exceedingly brittle as it relies on cascading internals */
private void writeToHadoopTap(Tap<?, ?, ?> tap) throws IOException {
@SuppressWarnings("unchecked")
Tap<JobConf, ?, ?> hadoopTap = (Tap<JobConf, ?, ?>) tap;
JobConf conf = new JobConf();
HadoopFlowProcess flowProcess = new HadoopFlowProcess(conf);
hadoopTap.sinkConfInit(flowProcess, conf);
TupleEntryCollector collector = hadoopTap.openForWrite(flowProcess);
for (TupleEntry tuple : data.asTupleEntryList()) {
collector.add(tuple);
}
collector.close();
}
/* WARNING: This is exceedingly brittle as it relies on cascading internals */
private void writeToHadoopPartitionTap(Tap<?, ?, ?> tap) throws IOException {
@SuppressWarnings("unchecked")
BasePartitionTap<JobConf, ?, ?> hadoopTap = (BasePartitionTap<JobConf, ?, ?>) tap;
JobConf conf = new JobConf();
// Avoids deletion of results when using a partition tap (close() will delete the _temporary before the copy has
// been done if not in a flow)
HadoopUtil.setIsInflow(conf);
HadoopFlowProcess flowProcess = new HadoopFlowProcess(conf);
hadoopTap.sinkConfInit(flowProcess, conf);
TupleEntryCollector collector = hadoopTap.openForWrite(flowProcess);
for (TupleEntry tuple : data.asTupleEntryList()) {
collector.add(tuple);
}
collector.close();
// We need to clean up the '_temporary' folder
BasePartitionTap<JobConf, ?, ?> partitionTap = hadoopTap;
@SuppressWarnings("unchecked")
String basePath = partitionTap.getParent().getFullIdentifier(flowProcess);
deleteTemporaryPath(new Path(basePath), FileSystem.get(conf));
}
private void deleteTemporaryPath(Path outputPath, FileSystem fileSystem) throws IOException {
if (fileSystem.exists(outputPath)) {
Path tmpDir = new Path(outputPath, Hadoop18TapUtil.TEMPORARY_PATH);
if (fileSystem.exists(tmpDir)) {
fileSystem.delete(tmpDir, true);
}
}
}
/* WARNING: This is exceedingly brittle as it relies on cascading internals */
private void writeToLocalTap(Tap<?, ?, ?> tap) throws IOException {
@SuppressWarnings("unchecked")
Tap<Properties, ?, ?> localTap = (Tap<Properties, ?, ?>) tap;
Properties conf = new Properties();
LocalFlowProcess flowProcess = new LocalFlowProcess(conf);
flowProcess.setStepStats(new LocalStepStats(new NullFlowStep(), NullClientState.INSTANCE));
localTap.sinkConfInit(flowProcess, conf);
TupleEntryCollector collector = localTap.openForWrite(flowProcess);
for (TupleEntry tuple : data.asTupleEntryList()) {
collector.add(tuple);
}
collector.close();
localTap.commitResource(conf);
}
private static class NullClientState extends ClientState {
private static NullClientState INSTANCE = new NullClientState();
private NullClientState() {
}
@Override
public void recordStats(@SuppressWarnings("rawtypes") CascadingStats stats) {
}
@Override
public void recordFlowStep(@SuppressWarnings("rawtypes") FlowStep flowStep) {
}
@Override
public void recordFlow(@SuppressWarnings("rawtypes") Flow flow) {
}
@Override
public void recordCascade(Cascade cascade) {
}
@Override
public void recordFlowNode(FlowNode flowNode) {
}
}
@SuppressWarnings("rawtypes")
private static class NullFlowStep implements FlowStep<Properties> {
@Override
public Collection<Group> getGroups() {
return null;
}
@Override
public Set<Tap> getSourceTaps() {
return null;
}
@Override
public Set<Tap> getSinkTaps() {
return null;
}
@Override
public Set<FlowElement> getSinkElements() {
return null;
}
@Override
public Set<FlowElement> getSourceElements() {
return null;
}
@Override
public Map<String, Tap> getTrapMap() {
return null;
}
@Override
public ElementGraph getElementGraph() {
return null;
}
@Override
public String getID() {
return null;
}
@Override
public int getOrdinal() {
return 0;
}
@Override
public String getName() {
return null;
}
@Override
public Flow<Properties> getFlow() {
return null;
}
@Override
public String getFlowID() {
return null;
}
@Override
public String getFlowName() {
return null;
}
@Override
public Properties getConfig() {
return null;
}
@Override
public String getStepDisplayName() {
return null;
}
@Override
public int getSubmitPriority() {
return 0;
}
@Override
public void setSubmitPriority(int submitPriority) {
}
@Override
public FlowNodeGraph getFlowNodeGraph() {
return null;
}
@Override
public int getNumFlowNodes() {
return 0;
}
@Override
public Group getGroup() {
return null;
}
@Override
public Tap getSink() {
return null;
}
@Override
public Set<String> getSourceName(Tap source) {
return null;
}
@Override
public Set<String> getSinkName(Tap sink) {
return null;
}
@Override
public Tap getSourceWith(String identifier) {
return null;
}
@Override
public Tap getSinkWith(String identifier) {
return null;
}
@Override
public Set<Tap> getTraps() {
return null;
}
@Override
public Tap getTrap(String name) {
return null;
}
@Override
public boolean containsPipeNamed(String pipeName) {
return false;
}
@Override
public FlowStepStats getFlowStepStats() {
return null;
}
@Override
public boolean hasListeners() {
return false;
}
@Override
public void addListener(FlowStepListener flowStepListener) {
}
@Override
public boolean removeListener(FlowStepListener flowStepListener) {
return false;
}
@Override
public Map<Object, Object> getConfigAsProperties() {
return null;
}
@Override
public Map<String, String> getProcessAnnotations() {
return null;
}
@Override
public void addProcessAnnotation(Enum annotation) {
}
@Override
public void addProcessAnnotation(String key, String value) {
}
@Override
public void setFlowStepStats(FlowStepStats flowStepStats) {
}
@Override
public Map<String, String> getFlowStepDescriptor() {
return null;
}
}
}