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EMR DynamoDB Hadoop Connector
/**
* Copyright 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file
* except in compliance with the License. A copy of the License is located at
*
* http://aws.amazon.com/apache2.0/
*
* or in the "LICENSE.TXT" file accompanying this file. This file 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.dynamodb;
import com.google.common.base.Strings;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.amazonaws.regions.RegionUtils;
import com.amazonaws.regions.ServiceAbbreviations;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.TableDescription;
import com.amazonaws.util.EC2MetadataUtils;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.dynamodb.util.ClusterTopologyNodeCapacityProvider;
import org.apache.hadoop.dynamodb.util.NodeCapacityProvider;
import org.apache.hadoop.dynamodb.util.RoundRobinYarnContainerAllocator;
import org.apache.hadoop.dynamodb.util.TaskCalculator;
import org.apache.hadoop.dynamodb.util.YarnContainerAllocator;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Type;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
public final class DynamoDBUtil {
public static final String CHARACTER_ENCODING = "UTF-8";
private static final Log log = LogFactory.getLog(DynamoDBUtil.class);
private static final Gson gson;
static {
GsonBuilder gsonBuilder = new GsonBuilder();
/* We hand serialize/deserialize ByteBuffer objects. */
gsonBuilder.registerTypeAdapter(ByteBuffer.class, new ByteBufferSerializer());
gsonBuilder.registerTypeAdapter(ByteBuffer.class, new ByteBufferDeserializer());
gson = gsonBuilder.disableHtmlEscaping().create();
}
public static Double calculateAverageItemSize(TableDescription description) {
if (description.getItemCount() != 0) {
return ((double) description.getTableSizeBytes()) / ((double) description.getItemCount());
}
return 0.0;
}
/**
* base64 encode a byte array using org.apache.commons.codec.binary.Base64
*
* @param bytes bytes to encode
* @return base64 encoded representation of the provided byte array
*/
public static String base64EncodeByteArray(byte[] bytes) {
try {
byte[] encodeBase64 = Base64.encodeBase64(bytes);
return new String(encodeBase64, "UTF-8");
} catch (Exception e) {
throw new RuntimeException("Exception while encoding bytes: " + Arrays.toString(bytes));
}
}
/**
* base64 decode a base64String using org.apache.commons.codec.binary.Base64
*
* @param base64String string to base64 decode
* @return byte array representing the decoded base64 string
*/
public static byte[] base64DecodeString(String base64String) {
try {
return Base64.decodeBase64(base64String.getBytes("UTF-8"));
} catch (Exception e) {
throw new RuntimeException("Exception while decoding " + base64String);
}
}
/**
* Converts a base64 encoded key into a ByteBuffer
*
* @param base64EncodedKey base64 encoded key to be converted
* @return {@link ByteBuffer} representation of the provided base64 encoded key string
*/
public static ByteBuffer base64StringToByteBuffer(String base64EncodedKey) {
return ByteBuffer.wrap(base64DecodeString(base64EncodedKey));
}
/**
* Converts a given list of base64EncodedKeys to a List of ByteBuffers
*
* @param base64EncodedKeys base64 encoded key(s) to be converted
* @return List of {@link ByteBuffer}s representing the provided base64EncodedKeys
*/
public static List base64StringToByteBuffer(String... base64EncodedKeys) {
List byteBuffers = new ArrayList<>(base64EncodedKeys.length);
for (String base64EncodedKey : base64EncodedKeys) {
byteBuffers.add(base64StringToByteBuffer(base64EncodedKey));
}
return byteBuffers;
}
/**
* Get a Gson reference with custom ByteBuffer serializer/deserializer.
*
* @return Gson reference with custom ByteBuffer serializer/deserializer
*/
public static Gson getGson() {
return gson;
}
static int getItemSizeBytes(Map item) {
try {
int itemSize = 0;
for (Entry entry : item.entrySet()) {
itemSize += entry.getKey().getBytes(CHARACTER_ENCODING).length;
itemSize += getAttributeSizeBytes(entry.getValue());
}
return itemSize;
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
public static void verifyInterval(long intervalBeginTime, long intervalLength) {
long interval = intervalBeginTime + intervalLength;
long currentDateTime = new DateTime(DateTimeZone.UTC).getMillis();
if (currentDateTime < interval) {
try {
Thread.sleep(interval - currentDateTime);
} catch (InterruptedException e) {
throw new RuntimeException("Interrupted while waiting ", e);
}
}
}
private static int getAttributeSizeBytes(AttributeValue att) throws UnsupportedEncodingException {
int byteSize = 0;
if (att.getN() != null) {
byteSize += att.getN().getBytes(CHARACTER_ENCODING).length;
} else if (att.getS() != null) {
byteSize += att.getS().getBytes(CHARACTER_ENCODING).length;
} else if (att.getB() != null) {
byteSize += att.getB().array().length;
} else if (att.getNS() != null) {
for (String number : att.getNS()) {
byteSize += number.getBytes(CHARACTER_ENCODING).length;
}
} else if (att.getSS() != null) {
for (String string : att.getSS()) {
byteSize += string.getBytes(CHARACTER_ENCODING).length;
}
} else if (att.getBS() != null) {
for (ByteBuffer byteBuffer : att.getBS()) {
byteSize += byteBuffer.array().length;
}
}
return byteSize;
}
public static String getValueFromConf(Configuration conf, String confKey, String defaultValue) {
if (conf == null) {
return defaultValue;
}
return conf.get(confKey, defaultValue);
}
public static String getValueFromConf(Configuration conf, String confKey) {
return getValueFromConf(conf, confKey, null);
}
/**
* Calculates DynamoDB end-point.
*
* Algorithm details:
*
* - Use endpoint in job configuration "dynamodb.endpoint" value if available
*
- Use endpoint from region in job configuration "dynamodb.region" value if available
*
- Use endpoint from region in job configuration "dynamodb.regionid" value if available
*
- Use endpoint from EC2 Metadata of instance if available
*
- If all previous attempts at retrieving endpoint fail, default to us-east-1 endpoint
*
*
* @param conf Job Configuration
* @param region optional preferred region
* @return end-point for DynamoDb service
*/
public static String getDynamoDBEndpoint(Configuration conf, String region) {
String endpoint = getValueFromConf(conf, DynamoDBConstants.ENDPOINT);
if (Strings.isNullOrEmpty(endpoint)) {
if (Strings.isNullOrEmpty(region)) {
region = getValueFromConf(conf, DynamoDBConstants.REGION);
}
if (Strings.isNullOrEmpty(region)) {
region = getValueFromConf(conf, DynamoDBConstants.REGION_ID);
}
if (Strings.isNullOrEmpty(region)) {
try {
region = EC2MetadataUtils.getEC2InstanceRegion();
} catch (Exception e) {
log.warn(String.format("Exception when attempting to get AWS region information. Will "
+ "ignore and default " + "to %s", DynamoDBConstants.DEFAULT_AWS_REGION), e);
}
}
if (Strings.isNullOrEmpty(region)) {
region = DynamoDBConstants.DEFAULT_AWS_REGION;
}
endpoint = RegionUtils.getRegion(region).getServiceEndpoint(ServiceAbbreviations.Dynamodb);
}
log.info("Using endpoint for DynamoDB: " + endpoint);
return endpoint;
}
public static JobClient createJobClient(JobConf jobConf) {
try {
return new JobClient(jobConf);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static int calcMaxMapTasks(JobClient jobClient) throws IOException {
JobConf conf = (JobConf) jobClient.getConf();
NodeCapacityProvider nodeCapacityProvider = new ClusterTopologyNodeCapacityProvider(conf);
YarnContainerAllocator yarnContainerAllocator = new RoundRobinYarnContainerAllocator();
TaskCalculator taskCalculator = new TaskCalculator(jobClient, nodeCapacityProvider,
yarnContainerAllocator);
return taskCalculator.getMaxMapTasks();
}
/**
* Since ByteBuffer does not have a no-arg constructor we hand serialize/deserialize them.
*/
private static class ByteBufferSerializer implements JsonSerializer {
@Override
public JsonElement serialize(ByteBuffer byteBuffer, Type type, JsonSerializationContext
context) {
String base64String = DynamoDBUtil.base64EncodeByteArray(byteBuffer.array());
return new JsonPrimitive(base64String);
}
}
/**
* Since ByteBuffer does not have a no-arg constructor we hand serialize/deserialize them.
*/
private static class ByteBufferDeserializer implements JsonDeserializer {
@Override
public ByteBuffer deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext
context) throws JsonParseException {
String base64String = jsonElement.getAsJsonPrimitive().getAsString();
return DynamoDBUtil.base64StringToByteBuffer(base64String);
}
}
private DynamoDBUtil() {}
}
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