| /* |
| * 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.cql3; |
| |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.Collection; |
| import java.util.List; |
| |
| import org.apache.cassandra.hadoop.ConfigHelper; |
| import org.apache.cassandra.hadoop.HadoopCompat; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.OutputCommitter; |
| import org.apache.hadoop.mapreduce.OutputFormat; |
| import org.apache.hadoop.mapreduce.RecordWriter; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.hadoop.util.Progressable; |
| |
| /** |
| * The <code>CqlBulkOutputFormat</code> acts as a Hadoop-specific |
| * OutputFormat that allows reduce tasks to store keys (and corresponding |
| * bound variable values) as CQL rows (and respective columns) in a given |
| * table. |
| * |
| * <p> |
| * As is the case with the {@link org.apache.cassandra.hadoop.cql3.CqlOutputFormat}, |
| * you need to set the prepared statement in your |
| * Hadoop job Configuration. The {@link CqlConfigHelper} class, through its |
| * {@link ConfigHelper#setOutputPreparedStatement} method, is provided to make this |
| * simple. |
| * you need to set the Keyspace. The {@link ConfigHelper} class, through its |
| * {@link ConfigHelper#setOutputColumnFamily} method, is provided to make this |
| * simple. |
| * </p> |
| */ |
| public class CqlBulkOutputFormat extends OutputFormat<Object, List<ByteBuffer>> |
| implements org.apache.hadoop.mapred.OutputFormat<Object, List<ByteBuffer>> |
| { |
| |
| private static final String OUTPUT_CQL_SCHEMA_PREFIX = "cassandra.table.schema."; |
| private static final String OUTPUT_CQL_INSERT_PREFIX = "cassandra.table.insert."; |
| private static final String DELETE_SOURCE = "cassandra.output.delete.source"; |
| private static final String TABLE_ALIAS_PREFIX = "cqlbulkoutputformat.table.alias."; |
| |
| /** Fills the deprecated OutputFormat interface for streaming. */ |
| @Deprecated |
| public CqlBulkRecordWriter getRecordWriter(FileSystem filesystem, JobConf job, String name, Progressable progress) throws IOException |
| { |
| return new CqlBulkRecordWriter(job, progress); |
| } |
| |
| /** |
| * Get the {@link RecordWriter} for the given task. |
| * |
| * @param context |
| * the information about the current task. |
| * @return a {@link RecordWriter} to write the output for the job. |
| * @throws IOException |
| */ |
| public CqlBulkRecordWriter getRecordWriter(final TaskAttemptContext context) throws IOException, InterruptedException |
| { |
| return new CqlBulkRecordWriter(context); |
| } |
| |
| @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 setTable()"); |
| } |
| } |
| |
| /** 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); |
| } |
| |
| @Override |
| public OutputCommitter getOutputCommitter(TaskAttemptContext context) throws IOException, InterruptedException |
| { |
| return new NullOutputCommitter(); |
| } |
| |
| public static void setTableSchema(Configuration conf, String columnFamily, String schema) |
| { |
| conf.set(OUTPUT_CQL_SCHEMA_PREFIX + columnFamily, schema); |
| } |
| |
| public static void setTableInsertStatement(Configuration conf, String columnFamily, String insertStatement) |
| { |
| conf.set(OUTPUT_CQL_INSERT_PREFIX + columnFamily, insertStatement); |
| } |
| |
| public static String getTableSchema(Configuration conf, String columnFamily) |
| { |
| String schema = conf.get(OUTPUT_CQL_SCHEMA_PREFIX + columnFamily); |
| if (schema == null) |
| { |
| throw new UnsupportedOperationException("You must set the Table schema using setTableSchema."); |
| } |
| return schema; |
| } |
| |
| public static String getTableInsertStatement(Configuration conf, String columnFamily) |
| { |
| String insert = conf.get(OUTPUT_CQL_INSERT_PREFIX + columnFamily); |
| if (insert == null) |
| { |
| throw new UnsupportedOperationException("You must set the Table insert statement using setTableSchema."); |
| } |
| return insert; |
| } |
| |
| public static void setDeleteSourceOnSuccess(Configuration conf, boolean deleteSrc) |
| { |
| conf.setBoolean(DELETE_SOURCE, deleteSrc); |
| } |
| |
| public static boolean getDeleteSourceOnSuccess(Configuration conf) |
| { |
| return conf.getBoolean(DELETE_SOURCE, false); |
| } |
| |
| public static void setTableAlias(Configuration conf, String alias, String columnFamily) |
| { |
| conf.set(TABLE_ALIAS_PREFIX + alias, columnFamily); |
| } |
| |
| public static String getTableForAlias(Configuration conf, String alias) |
| { |
| return conf.get(TABLE_ALIAS_PREFIX + alias); |
| } |
| |
| /** |
| * 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(CqlBulkRecordWriter.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(CqlBulkRecordWriter.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(CqlBulkRecordWriter.IGNORE_HOSTS); |
| } |
| |
| 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) { } |
| } |
| } |