/**
* 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.hive.hcatalog.api.repl.commands;
import org.apache.hive.hcatalog.api.repl.Command;
import org.apache.hive.hcatalog.api.repl.ReplicationUtils;
import org.apache.hive.hcatalog.data.ReaderWriter;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.Map;
public class ExportCommand implements Command {
private String exportLocation;
private String dbName = null;
private String tableName = null;
private Map<String, String> ptnDesc = null;
private long eventId;
private boolean isMetadataOnly = false;
public ExportCommand(String dbName, String tableName, Map<String, String> ptnDesc,
String exportLocation, boolean isMetadataOnly, long eventId) {
this.dbName = dbName;
this.tableName = tableName;
this.ptnDesc = ptnDesc;
this.exportLocation = exportLocation;
this.isMetadataOnly = isMetadataOnly;
this.eventId = eventId;
}
/**
* Trivial ctor to support Writable reflections instantiation
* do not expect to use this object as-is, unless you call
* readFields after using this ctor
*/
public ExportCommand(){
}
@Override
public List<String> get() {
// EXPORT TABLE tablename [PARTITION (part_column="value"[, ...])]
// TO 'export_target_path'
StringBuilder sb = new StringBuilder();
sb.append("EXPORT TABLE ");
sb.append(dbName);
sb.append(".");
sb.append(tableName); // TODO: Handle quoted tablenames
sb.append(ReplicationUtils.partitionDescriptor(ptnDesc));
sb.append(" TO '");
sb.append(exportLocation);
sb.append("\' FOR ");
if (isMetadataOnly){
sb.append("METADATA ");
}
sb.append("REPLICATION(\'");
sb.append(eventId);
sb.append("\')");
return Collections.singletonList(sb.toString());
}
@Override
public boolean isRetriable() {
return true; // Export is trivially retriable (after clearing out the staging dir provided.)
}
@Override
public boolean isUndoable() {
return true; // Export is trivially undoable - in that nothing needs doing to undo it.
}
@Override
public List<String> getUndo() {
return Collections.emptyList();
}
@Override
public List<String> cleanupLocationsPerRetry() {
return Collections.singletonList(exportLocation);
}
@Override
public List<String> cleanupLocationsAfterEvent() {
return Collections.singletonList(exportLocation);
}
@Override
public long getEventId() {
return eventId;
}
@Override
public void write(DataOutput dataOutput) throws IOException {
ReaderWriter.writeDatum(dataOutput, dbName);
ReaderWriter.writeDatum(dataOutput, tableName);
ReaderWriter.writeDatum(dataOutput, ptnDesc);
ReaderWriter.writeDatum(dataOutput, exportLocation);
ReaderWriter.writeDatum(dataOutput, isMetadataOnly);
ReaderWriter.writeDatum(dataOutput, eventId);
}
@Override
public void readFields(DataInput dataInput) throws IOException {
dbName = (String)ReaderWriter.readDatum(dataInput);
tableName = (String)ReaderWriter.readDatum(dataInput);
ptnDesc = (Map<String,String>)ReaderWriter.readDatum(dataInput);
exportLocation = (String)ReaderWriter.readDatum(dataInput);
isMetadataOnly = (Boolean) ReaderWriter.readDatum(dataInput);
eventId = (Long) ReaderWriter.readDatum(dataInput);
}
}