| /** |
| * 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.hadoop.util; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.CommonConfigurationKeys; |
| |
| /** |
| * A helper to load the native hadoop code i.e. libhadoop.so. |
| * This handles the fallback to either the bundled libhadoop-Linux-i386-32.so |
| * or the default java implementations where appropriate. |
| * |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public class NativeCodeLoader { |
| |
| private static final Log LOG = |
| LogFactory.getLog(NativeCodeLoader.class); |
| |
| private static boolean nativeCodeLoaded = false; |
| |
| static { |
| // Try to load native hadoop library and set fallback flag appropriately |
| if(LOG.isDebugEnabled()) { |
| LOG.debug("Trying to load the custom-built native-hadoop library..."); |
| } |
| try { |
| System.loadLibrary("hadoop"); |
| LOG.info("Loaded the native-hadoop library"); |
| nativeCodeLoaded = true; |
| } catch (Throwable t) { |
| // Ignore failure to load |
| if(LOG.isDebugEnabled()) { |
| LOG.debug("Failed to load native-hadoop with error: " + t); |
| LOG.debug("java.library.path=" + |
| System.getProperty("java.library.path")); |
| } |
| } |
| |
| if (!nativeCodeLoaded) { |
| LOG.warn("Unable to load native-hadoop library for your platform... " + |
| "using builtin-java classes where applicable"); |
| } |
| } |
| |
| /** |
| * Check if native-hadoop code is loaded for this platform. |
| * |
| * @return <code>true</code> if native-hadoop is loaded, |
| * else <code>false</code> |
| */ |
| public static boolean isNativeCodeLoaded() { |
| return nativeCodeLoaded; |
| } |
| |
| /** |
| * Return if native hadoop libraries, if present, can be used for this job. |
| * @param conf configuration |
| * |
| * @return <code>true</code> if native hadoop libraries, if present, can be |
| * used for this job; <code>false</code> otherwise. |
| */ |
| public boolean getLoadNativeLibraries(Configuration conf) { |
| return conf.getBoolean(CommonConfigurationKeys.IO_NATIVE_LIB_AVAILABLE_KEY, |
| CommonConfigurationKeys.IO_NATIVE_LIB_AVAILABLE_DEFAULT); |
| } |
| |
| /** |
| * Set if native hadoop libraries, if present, can be used for this job. |
| * |
| * @param conf configuration |
| * @param loadNativeLibraries can native hadoop libraries be loaded |
| */ |
| public void setLoadNativeLibraries(Configuration conf, |
| boolean loadNativeLibraries) { |
| conf.setBoolean(CommonConfigurationKeys.IO_NATIVE_LIB_AVAILABLE_KEY, |
| loadNativeLibraries); |
| } |
| |
| } |