org.apache.cassandra.hadoop.AbstractBulkOutputFormat.java Source code

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Here is the source code for org.apache.cassandra.hadoop.AbstractBulkOutputFormat.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.cassandra.hadoop;

import java.io.IOException;
import java.util.Collection;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.*;

public abstract class AbstractBulkOutputFormat<K, V> extends OutputFormat<K, V>
        implements org.apache.hadoop.mapred.OutputFormat<K, V> {
    @Override
    public void checkOutputSpecs(JobContext context) {
        checkOutputSpecs(HadoopCompat.getConfiguration(context));
    }

    private void checkOutputSpecs(Configuration conf) {
        if (ConfigHelper.getOutputKeyspace(conf) == null) {
            throw new UnsupportedOperationException("you must set the keyspace with setColumnFamily()");
        }
    }

    @Override
    public OutputCommitter getOutputCommitter(TaskAttemptContext context) throws IOException, InterruptedException {
        return new NullOutputCommitter();
    }

    /** Fills the deprecated OutputFormat interface for streaming. */
    @Deprecated
    public void checkOutputSpecs(org.apache.hadoop.fs.FileSystem filesystem, org.apache.hadoop.mapred.JobConf job)
            throws IOException {
        checkOutputSpecs(job);
    }

    public static class NullOutputCommitter extends OutputCommitter {
        public void abortTask(TaskAttemptContext taskContext) {
        }

        public void cleanupJob(JobContext jobContext) {
        }

        public void commitTask(TaskAttemptContext taskContext) {
        }

        public boolean needsTaskCommit(TaskAttemptContext taskContext) {
            return false;
        }

        public void setupJob(JobContext jobContext) {
        }

        public void setupTask(TaskAttemptContext taskContext) {
        }
    }

    /**
     * Set the hosts to ignore as comma delimited values.
     * Data will not be bulk loaded onto the ignored nodes.
     * @param conf job configuration
     * @param ignoreNodesCsv a comma delimited list of nodes to ignore
     */
    public static void setIgnoreHosts(Configuration conf, String ignoreNodesCsv) {
        conf.set(AbstractBulkRecordWriter.IGNORE_HOSTS, ignoreNodesCsv);
    }

    /**
     * Set the hosts to ignore. Data will not be bulk loaded onto the ignored nodes.
     * @param conf job configuration
     * @param ignoreNodes the nodes to ignore
     */
    public static void setIgnoreHosts(Configuration conf, String... ignoreNodes) {
        conf.setStrings(AbstractBulkRecordWriter.IGNORE_HOSTS, ignoreNodes);
    }

    /**
     * Get the hosts to ignore as a collection of strings
     * @param conf job configuration
     * @return the nodes to ignore as a collection of stirngs
     */
    public static Collection<String> getIgnoreHosts(Configuration conf) {
        return conf.getStringCollection(AbstractBulkRecordWriter.IGNORE_HOSTS);
    }
}