org.apache.druid.storage.hdfs.HdfsStorageDruidModule.java Source code

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Here is the source code for org.apache.druid.storage.hdfs.HdfsStorageDruidModule.java

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/*
 * 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.druid.storage.hdfs;

import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.Module;
import com.google.common.collect.ImmutableList;
import com.google.inject.Binder;
import com.google.inject.Inject;
import com.google.inject.multibindings.MapBinder;
import org.apache.druid.data.SearchableVersionedDataFinder;
import org.apache.druid.guice.Binders;
import org.apache.druid.guice.JsonConfigProvider;
import org.apache.druid.guice.LazySingleton;
import org.apache.druid.guice.LifecycleModule;
import org.apache.druid.guice.ManageLifecycle;
import org.apache.druid.initialization.DruidModule;
import org.apache.druid.storage.hdfs.tasklog.HdfsTaskLogs;
import org.apache.druid.storage.hdfs.tasklog.HdfsTaskLogsConfig;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;

import java.io.IOException;
import java.util.List;
import java.util.Properties;

/**
 */
public class HdfsStorageDruidModule implements DruidModule {
    public static final String SCHEME = "hdfs";
    private Properties props = null;

    @Inject
    public void setProperties(Properties props) {
        this.props = props;
    }

    @Override
    public List<? extends Module> getJacksonModules() {
        return ImmutableList.of(new Module() {
            @Override
            public String getModuleName() {
                return "DruidHDFSStorage-" + System.identityHashCode(this);
            }

            @Override
            public Version version() {
                return Version.unknownVersion();
            }

            @Override
            public void setupModule(SetupContext context) {
                context.registerSubtypes(HdfsLoadSpec.class);
            }
        });
    }

    @Override
    public void configure(Binder binder) {
        MapBinder.newMapBinder(binder, String.class, SearchableVersionedDataFinder.class).addBinding(SCHEME)
                .to(HdfsFileTimestampVersionFinder.class).in(LazySingleton.class);

        Binders.dataSegmentPusherBinder(binder).addBinding(SCHEME).to(HdfsDataSegmentPusher.class)
                .in(LazySingleton.class);
        Binders.dataSegmentKillerBinder(binder).addBinding(SCHEME).to(HdfsDataSegmentKiller.class)
                .in(LazySingleton.class);

        final Configuration conf = new Configuration();

        // Set explicit CL. Otherwise it'll try to use thread context CL, which may not have all of our dependencies.
        conf.setClassLoader(getClass().getClassLoader());

        // Ensure that FileSystem class level initialization happens with correct CL
        // See https://github.com/apache/incubator-druid/issues/1714
        ClassLoader currCtxCl = Thread.currentThread().getContextClassLoader();
        try {
            Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
            FileSystem.get(conf);
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        } finally {
            Thread.currentThread().setContextClassLoader(currCtxCl);
        }

        if (props != null) {
            for (String propName : props.stringPropertyNames()) {
                if (propName.startsWith("hadoop.")) {
                    conf.set(propName.substring("hadoop.".length()), props.getProperty(propName));
                }
            }
        }

        binder.bind(Configuration.class).toInstance(conf);
        JsonConfigProvider.bind(binder, "druid.storage", HdfsDataSegmentPusherConfig.class);

        Binders.taskLogsBinder(binder).addBinding("hdfs").to(HdfsTaskLogs.class);
        JsonConfigProvider.bind(binder, "druid.indexer.logs", HdfsTaskLogsConfig.class);
        binder.bind(HdfsTaskLogs.class).in(LazySingleton.class);
        JsonConfigProvider.bind(binder, "druid.hadoop.security.kerberos", HdfsKerberosConfig.class);
        binder.bind(HdfsStorageAuthentication.class).in(ManageLifecycle.class);
        LifecycleModule.register(binder, HdfsStorageAuthentication.class);

    }
}