org.apache.sysml.runtime.matrix.mapred.MRConfigurationNames Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of systemml Show documentation
Show all versions of systemml Show documentation
Declarative Machine Learning
/*
* 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.sysml.runtime.matrix.mapred;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.util.VersionInfo;
/**
* This class provides a central local for used hadoop configuration properties.
* For portability, we support both hadoop 1.x and 2.x and automatically map to
* the currently used cluster.
*
*/
public abstract class MRConfigurationNames
{
protected static final Log LOG = LogFactory.getLog(MRConfigurationNames.class.getName());
//name definitions
public static final String INVALID = "null";
public static String DFS_SESSION_ID = INVALID;
public static String DFS_BLOCK_SIZE = INVALID;
public static String DFS_PERMISSIONS = INVALID;
//initialize to used cluster
static{
//determine hadoop version
//e.g., 2.0.4-alpha from 0a11e32419bd4070f28c6d96db66c2abe9fd6d91 by jenkins source checksum f3c1bf36ae3aa5a6f6d3447fcfadbba
String version = VersionInfo.getBuildVersion();
boolean hadoopVersion2 = version.startsWith("2");
LOG.debug("Hadoop build version: "+version);
if( hadoopVersion2 )
{
LOG.debug("Using hadoop 2.x configuration properties.");
DFS_SESSION_ID = "dfs.metrics.session-id";
DFS_BLOCK_SIZE = "dfs.blocksize";
DFS_PERMISSIONS = "dfs.permissions.enabled";
}
else //any older version
{
LOG.debug("Using hadoop 1.x configuration properties.");
DFS_SESSION_ID = "session.id";
DFS_BLOCK_SIZE = "dfs.block.size";
DFS_PERMISSIONS = "dfs.permissions";
}
}
}