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KeyValueRecordWriter.java
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KeyValueRecordWriter.java
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/*
* Licensed to the University of California, Berkeley 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 tachyon.client.keyvalue.hadoop;
import java.io.IOException;
import java.util.Arrays;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.mapred.RecordWriter;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.util.Progressable;
import org.apache.http.annotation.ThreadSafe;
import tachyon.TachyonURI;
import tachyon.client.keyvalue.KeyValueStoreWriter;
import tachyon.client.keyvalue.KeyValueStores;
import tachyon.exception.TachyonException;
/**
* A {@link RecordWriter} to write key-value pairs into a temporary key-value store.
*/
@ThreadSafe
class KeyValueRecordWriter implements RecordWriter<BytesWritable, BytesWritable> {
private final KeyValueStoreWriter mWriter;
private final Progressable mProgress;
/**
* Constructs a new {@link KeyValueRecordWriter}.
*
* @param storeUri the URI for the temporary key-value store to be created by this record writer
* @param progress the object to be used for reporting progress
* @throws IOException when instance creation fails
*/
public KeyValueRecordWriter(TachyonURI storeUri, Progressable progress) throws IOException {
try {
mWriter = KeyValueStores.Factory.create().create(storeUri);
} catch (TachyonException e) {
throw new IOException(e);
}
mProgress = progress;
}
@Override
public synchronized void write(BytesWritable key, BytesWritable value) throws IOException {
try {
// NOTE: BytesWritable.getBytes() returns the internal byte array, whose length might not be
// the same as BytesWritable.getLength().
mWriter.put(Arrays.copyOf(key.getBytes(), key.getLength()),
Arrays.copyOf(value.getBytes(), value.getLength()));
// Sends a progress to the job manager to inform it that the task is still running.
mProgress.progress();
} catch (TachyonException e) {
throw new IOException(e);
}
}
@Override
public synchronized void close(Reporter reporter) throws IOException {
// Completes the new store.
mWriter.close();
}
}