io.druid.storage.hdfs.HdfsStorageDruidModule.java Source code

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

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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * Licensed 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 io.druid.storage.hdfs;

import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.Module;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import com.google.inject.Binder;
import com.google.inject.Inject;
import com.google.inject.multibindings.MapBinder;
import io.druid.data.SearchableVersionedDataFinder;
import io.druid.guice.Binders;
import io.druid.guice.JsonConfigProvider;
import io.druid.guice.LazySingleton;
import io.druid.initialization.DruidModule;
import io.druid.storage.hdfs.tasklog.HdfsTaskLogs;
import io.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.dataSegmentPullerBinder(binder).addBinding(SCHEME).to(HdfsDataSegmentPuller.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/druid-io/druid/issues/1714
        ClassLoader currCtxCl = Thread.currentThread().getContextClassLoader();
        try {
            Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
            FileSystem.get(conf);
        } catch (IOException ex) {
            throw Throwables.propagate(ex);
        } finally {
            Thread.currentThread().setContextClassLoader(currCtxCl);
        }

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