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*
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* 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.
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*/
package org.apache.cassandra.hadoop;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.dht.IPartitioner;
import org.apache.cassandra.schema.CompressionParams;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.Pair;
import org.apache.hadoop.conf.Configuration;
public class ConfigHelper
{
private static final String INPUT_PARTITIONER_CONFIG = "cassandra.input.partitioner.class";
private static final String OUTPUT_PARTITIONER_CONFIG = "cassandra.output.partitioner.class";
private static final String INPUT_KEYSPACE_CONFIG = "cassandra.input.keyspace";
private static final String OUTPUT_KEYSPACE_CONFIG = "cassandra.output.keyspace";
private static final String INPUT_KEYSPACE_USERNAME_CONFIG = "cassandra.input.keyspace.username";
private static final String INPUT_KEYSPACE_PASSWD_CONFIG = "cassandra.input.keyspace.passwd";
private static final String OUTPUT_KEYSPACE_USERNAME_CONFIG = "cassandra.output.keyspace.username";
private static final String OUTPUT_KEYSPACE_PASSWD_CONFIG = "cassandra.output.keyspace.passwd";
private static final String INPUT_COLUMNFAMILY_CONFIG = "cassandra.input.columnfamily";
private static final String OUTPUT_COLUMNFAMILY_CONFIG = "mapreduce.output.basename"; //this must == OutputFormat.BASE_OUTPUT_NAME
private static final String INPUT_PREDICATE_CONFIG = "cassandra.input.predicate";
private static final String INPUT_KEYRANGE_CONFIG = "cassandra.input.keyRange";
private static final String INPUT_SPLIT_SIZE_CONFIG = "cassandra.input.split.size";
private static final String INPUT_SPLIT_SIZE_IN_MB_CONFIG = "cassandra.input.split.size_mb";
private static final String INPUT_WIDEROWS_CONFIG = "cassandra.input.widerows";
private static final int DEFAULT_SPLIT_SIZE = 64 * 1024;
private static final String RANGE_BATCH_SIZE_CONFIG = "cassandra.range.batch.size";
private static final int DEFAULT_RANGE_BATCH_SIZE = 4096;
private static final String INPUT_INITIAL_ADDRESS = "cassandra.input.address";
private static final String OUTPUT_INITIAL_ADDRESS = "cassandra.output.address";
private static final String READ_CONSISTENCY_LEVEL = "cassandra.consistencylevel.read";
private static final String WRITE_CONSISTENCY_LEVEL = "cassandra.consistencylevel.write";
private static final String OUTPUT_COMPRESSION_CLASS = "cassandra.output.compression.class";
private static final String OUTPUT_COMPRESSION_CHUNK_LENGTH = "cassandra.output.compression.length";
private static final String OUTPUT_LOCAL_DC_ONLY = "cassandra.output.local.dc.only";
private static final Logger logger = LoggerFactory.getLogger(ConfigHelper.class);
/**
* Set the keyspace and column family for the input of this job.
*
* @param conf Job configuration you are about to run
* @param keyspace
* @param columnFamily
* @param widerows
*/
public static void setInputColumnFamily(Configuration conf, String keyspace, String columnFamily, boolean widerows)
{
if (keyspace == null)
throw new UnsupportedOperationException("keyspace may not be null");
if (columnFamily == null)
throw new UnsupportedOperationException("table may not be null");
conf.set(INPUT_KEYSPACE_CONFIG, keyspace);
conf.set(INPUT_COLUMNFAMILY_CONFIG, columnFamily);
conf.set(INPUT_WIDEROWS_CONFIG, String.valueOf(widerows));
}
/**
* Set the keyspace and column family for the input of this job.
*
* @param conf Job configuration you are about to run
* @param keyspace
* @param columnFamily
*/
public static void setInputColumnFamily(Configuration conf, String keyspace, String columnFamily)
{
setInputColumnFamily(conf, keyspace, columnFamily, false);
}
/**
* Set the keyspace for the output of this job.
*
* @param conf Job configuration you are about to run
* @param keyspace
*/
public static void setOutputKeyspace(Configuration conf, String keyspace)
{
if (keyspace == null)
throw new UnsupportedOperationException("keyspace may not be null");
conf.set(OUTPUT_KEYSPACE_CONFIG, keyspace);
}
/**
* Set the column family for the output of this job.
*
* @param conf Job configuration you are about to run
* @param columnFamily
*/
public static void setOutputColumnFamily(Configuration conf, String columnFamily)
{
conf.set(OUTPUT_COLUMNFAMILY_CONFIG, columnFamily);
}
/**
* Set the column family for the output of this job.
*
* @param conf Job configuration you are about to run
* @param keyspace
* @param columnFamily
*/
public static void setOutputColumnFamily(Configuration conf, String keyspace, String columnFamily)
{
setOutputKeyspace(conf, keyspace);
setOutputColumnFamily(conf, columnFamily);
}
/**
* The number of rows to request with each get range slices request.
* Too big and you can either get timeouts when it takes Cassandra too
* long to fetch all the data. Too small and the performance
* will be eaten up by the overhead of each request.
*
* @param conf Job configuration you are about to run
* @param batchsize Number of rows to request each time
*/
public static void setRangeBatchSize(Configuration conf, int batchsize)
{
conf.setInt(RANGE_BATCH_SIZE_CONFIG, batchsize);
}
/**
* The number of rows to request with each get range slices request.
* Too big and you can either get timeouts when it takes Cassandra too
* long to fetch all the data. Too small and the performance
* will be eaten up by the overhead of each request.
*
* @param conf Job configuration you are about to run
* @return Number of rows to request each time
*/
public static int getRangeBatchSize(Configuration conf)
{
return conf.getInt(RANGE_BATCH_SIZE_CONFIG, DEFAULT_RANGE_BATCH_SIZE);
}
/**
* Set the size of the input split.
* This affects the number of maps created, if the number is too small
* the overhead of each map will take up the bulk of the job time.
*
* @param conf Job configuration you are about to run
* @param splitsize Number of partitions in the input split
*/
public static void setInputSplitSize(Configuration conf, int splitsize)
{
conf.setInt(INPUT_SPLIT_SIZE_CONFIG, splitsize);
}
public static int getInputSplitSize(Configuration conf)
{
return conf.getInt(INPUT_SPLIT_SIZE_CONFIG, DEFAULT_SPLIT_SIZE);
}
/**
* Set the size of the input split. setInputSplitSize value is used if this is not set.
* This affects the number of maps created, if the number is too small
* the overhead of each map will take up the bulk of the job time.
*
* @param conf Job configuration you are about to run
* @param splitSizeMb Input split size in MB
*/
public static void setInputSplitSizeInMb(Configuration conf, int splitSizeMb)
{
conf.setInt(INPUT_SPLIT_SIZE_IN_MB_CONFIG, splitSizeMb);
}
/**
* cassandra.input.split.size will be used if the value is undefined or negative.
* @param conf Job configuration you are about to run
* @return split size in MB or -1 if it is undefined.
*/
public static int getInputSplitSizeInMb(Configuration conf)
{
return conf.getInt(INPUT_SPLIT_SIZE_IN_MB_CONFIG, -1);
}
/**
* Set the KeyRange to limit the rows.
* @param conf Job configuration you are about to run
*/
public static void setInputRange(Configuration conf, String startToken, String endToken)
{
conf.set(INPUT_KEYRANGE_CONFIG, startToken + "," + endToken);
}
/**
* The start and end token of the input key range as a pair.
*
* may be null if unset.
*/
public static Pair<String, String> getInputKeyRange(Configuration conf)
{
String str = conf.get(INPUT_KEYRANGE_CONFIG);
if (str == null)
return null;
String[] parts = str.split(",");
assert parts.length == 2;
return Pair.create(parts[0], parts[1]);
}
public static String getInputKeyspace(Configuration conf)
{
return conf.get(INPUT_KEYSPACE_CONFIG);
}
public static String getOutputKeyspace(Configuration conf)
{
return conf.get(OUTPUT_KEYSPACE_CONFIG);
}
public static void setInputKeyspaceUserNameAndPassword(Configuration conf, String username, String password)
{
setInputKeyspaceUserName(conf, username);
setInputKeyspacePassword(conf, password);
}
public static void setInputKeyspaceUserName(Configuration conf, String username)
{
conf.set(INPUT_KEYSPACE_USERNAME_CONFIG, username);
}
public static String getInputKeyspaceUserName(Configuration conf)
{
return conf.get(INPUT_KEYSPACE_USERNAME_CONFIG);
}
public static void setInputKeyspacePassword(Configuration conf, String password)
{
conf.set(INPUT_KEYSPACE_PASSWD_CONFIG, password);
}
public static String getInputKeyspacePassword(Configuration conf)
{
return conf.get(INPUT_KEYSPACE_PASSWD_CONFIG);
}
public static void setOutputKeyspaceUserNameAndPassword(Configuration conf, String username, String password)
{
setOutputKeyspaceUserName(conf, username);
setOutputKeyspacePassword(conf, password);
}
public static void setOutputKeyspaceUserName(Configuration conf, String username)
{
conf.set(OUTPUT_KEYSPACE_USERNAME_CONFIG, username);
}
public static String getOutputKeyspaceUserName(Configuration conf)
{
return conf.get(OUTPUT_KEYSPACE_USERNAME_CONFIG);
}
public static void setOutputKeyspacePassword(Configuration conf, String password)
{
conf.set(OUTPUT_KEYSPACE_PASSWD_CONFIG, password);
}
public static String getOutputKeyspacePassword(Configuration conf)
{
return conf.get(OUTPUT_KEYSPACE_PASSWD_CONFIG);
}
public static String getInputColumnFamily(Configuration conf)
{
return conf.get(INPUT_COLUMNFAMILY_CONFIG);
}
public static String getOutputColumnFamily(Configuration conf)
{
if (conf.get(OUTPUT_COLUMNFAMILY_CONFIG) != null)
return conf.get(OUTPUT_COLUMNFAMILY_CONFIG);
else
throw new UnsupportedOperationException("You must set the output column family using either setOutputColumnFamily or by adding a named output with MultipleOutputs");
}
public static boolean getInputIsWide(Configuration conf)
{
return Boolean.parseBoolean(conf.get(INPUT_WIDEROWS_CONFIG));
}
public static String getReadConsistencyLevel(Configuration conf)
{
return conf.get(READ_CONSISTENCY_LEVEL, "LOCAL_ONE");
}
public static void setReadConsistencyLevel(Configuration conf, String consistencyLevel)
{
conf.set(READ_CONSISTENCY_LEVEL, consistencyLevel);
}
public static String getWriteConsistencyLevel(Configuration conf)
{
return conf.get(WRITE_CONSISTENCY_LEVEL, "LOCAL_ONE");
}
public static void setWriteConsistencyLevel(Configuration conf, String consistencyLevel)
{
conf.set(WRITE_CONSISTENCY_LEVEL, consistencyLevel);
}
public static String getInputInitialAddress(Configuration conf)
{
return conf.get(INPUT_INITIAL_ADDRESS);
}
public static void setInputInitialAddress(Configuration conf, String address)
{
conf.set(INPUT_INITIAL_ADDRESS, address);
}
public static void setInputPartitioner(Configuration conf, String classname)
{
conf.set(INPUT_PARTITIONER_CONFIG, classname);
}
public static IPartitioner getInputPartitioner(Configuration conf)
{
return FBUtilities.newPartitioner(conf.get(INPUT_PARTITIONER_CONFIG));
}
public static String getOutputInitialAddress(Configuration conf)
{
return conf.get(OUTPUT_INITIAL_ADDRESS);
}
public static void setOutputInitialAddress(Configuration conf, String address)
{
conf.set(OUTPUT_INITIAL_ADDRESS, address);
}
public static void setOutputPartitioner(Configuration conf, String classname)
{
conf.set(OUTPUT_PARTITIONER_CONFIG, classname);
}
public static IPartitioner getOutputPartitioner(Configuration conf)
{
return FBUtilities.newPartitioner(conf.get(OUTPUT_PARTITIONER_CONFIG));
}
public static String getOutputCompressionClass(Configuration conf)
{
return conf.get(OUTPUT_COMPRESSION_CLASS);
}
public static String getOutputCompressionChunkLength(Configuration conf)
{
return conf.get(OUTPUT_COMPRESSION_CHUNK_LENGTH, String.valueOf(CompressionParams.DEFAULT_CHUNK_LENGTH));
}
public static void setOutputCompressionClass(Configuration conf, String classname)
{
conf.set(OUTPUT_COMPRESSION_CLASS, classname);
}
public static void setOutputCompressionChunkLength(Configuration conf, String length)
{
conf.set(OUTPUT_COMPRESSION_CHUNK_LENGTH, length);
}
public static boolean getOutputLocalDCOnly(Configuration conf)
{
return Boolean.parseBoolean(conf.get(OUTPUT_LOCAL_DC_ONLY, "false"));
}
public static void setOutputLocalDCOnly(Configuration conf, boolean localDCOnly)
{
conf.set(OUTPUT_LOCAL_DC_ONLY, Boolean.toString(localDCOnly));
}
}