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From st...@apache.org
Subject svn commit: r816039 - in /hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce: Export.java Import.java
Date Thu, 17 Sep 2009 03:26:02 GMT
Author: stack
Date: Thu Sep 17 03:26:02 2009
New Revision: 816039

URL: http://svn.apache.org/viewvc?rev=816039&view=rev
Log:
HBASE-1684  Backup (Export/Import) contrib tool for 0.20

Added:
    hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce/Export.java
    hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce/Import.java

Added: hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce/Export.java
URL: http://svn.apache.org/viewvc/hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce/Export.java?rev=816039&view=auto
==============================================================================
--- hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce/Export.java (added)
+++ hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce/Export.java Thu
Sep 17 03:26:02 2009
@@ -0,0 +1,120 @@
+/**
+ * Copyright 2009 The Apache Software Foundation
+ *
+ * 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.hbase.mapreduce;
+
+import java.io.IOException;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.client.Result;
+import org.apache.hadoop.hbase.client.Scan;
+import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
+import org.apache.hadoop.mapreduce.Job;
+import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
+import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
+import org.apache.hadoop.util.GenericOptionsParser;
+
+/**
+ * Export an HBase table.
+ * Writes content to sequence files up in HDFS.  Use {@link Import} to read it
+ * back in again.
+ */
+public class Export {
+  final static String NAME = "export";
+
+  /**
+   * Mapper.
+   */
+  static class Exporter
+  extends TableMapper<ImmutableBytesWritable, Result> {
+    /**
+     * @param row  The current table row key.
+     * @param value  The columns.
+     * @param context  The current context.
+     * @throws IOException When something is broken with the data.
+     * @see org.apache.hadoop.mapreduce.Mapper#map(KEYIN, VALUEIN, 
+     *   org.apache.hadoop.mapreduce.Mapper.Context)
+     */
+    @Override
+    public void map(ImmutableBytesWritable row, Result value,
+      Context context)
+    throws IOException {
+      try {
+        context.write(row, value);
+      } catch (InterruptedException e) {
+        e.printStackTrace();
+      }
+    }
+  }
+
+  /**
+   * Sets up the actual job.
+   * 
+   * @param conf  The current configuration.
+   * @param args  The command line parameters.
+   * @return The newly created job.
+   * @throws IOException When setting up the job fails.
+   */
+  public static Job createSubmittableJob(Configuration conf, String[] args)
+  throws IOException {
+    String tableName = args[0];
+    Path outputDir = new Path(args[1]);
+    Job job = new Job(conf, NAME + "_" + tableName);
+    job.setJarByClass(Exporter.class);
+    // TODO: Allow passing filter and subset of rows/columns.
+    TableMapReduceUtil.initTableMapperJob(tableName, new Scan(),
+      Exporter.class, null, null, job);
+    // No reducers.  Just write straight to output files.
+    job.setNumReduceTasks(0);
+    job.setOutputFormatClass(SequenceFileOutputFormat.class);
+    job.setOutputKeyClass(ImmutableBytesWritable.class);
+    job.setOutputValueClass(Result.class);
+    FileOutputFormat.setOutputPath(job, outputDir);
+    return job;
+  }
+
+  /*
+   * @param errorMsg Error message.  Can be null.
+   */
+  private static void usage(final String errorMsg) {
+    if (errorMsg != null && errorMsg.length() > 0) {
+      System.err.println("ERROR: " + errorMsg);
+    }
+    System.err.println("Usage: Export <tablename> <outputdir>");
+  }
+
+  /**
+   * Main entry point.
+   * 
+   * @param args  The command line parameters.
+   * @throws Exception When running the job fails.
+   */
+  public static void main(String[] args) throws Exception {
+    HBaseConfiguration conf = new HBaseConfiguration();
+    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
+    if (otherArgs.length < 2) {
+      usage("Wrong number of arguments: " + otherArgs.length);
+      System.exit(-1);
+    }
+    Job job = createSubmittableJob(conf, otherArgs);
+    System.exit(job.waitForCompletion(true) ? 0 : 1);
+  }
+}
\ No newline at end of file

Added: hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce/Import.java
URL: http://svn.apache.org/viewvc/hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce/Import.java?rev=816039&view=auto
==============================================================================
--- hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce/Import.java (added)
+++ hadoop/hbase/branches/0.20/src/java/org/apache/hadoop/hbase/mapreduce/Import.java Thu
Sep 17 03:26:02 2009
@@ -0,0 +1,126 @@
+/**
+ * Copyright 2009 The Apache Software Foundation
+ *
+ * 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.hbase.mapreduce;
+
+import java.io.IOException;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.KeyValue;
+import org.apache.hadoop.hbase.client.Put;
+import org.apache.hadoop.hbase.client.Result;
+import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
+import org.apache.hadoop.mapreduce.Job;
+import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
+import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
+import org.apache.hadoop.util.GenericOptionsParser;
+
+/**
+ * Import data written by {@link Export}.
+ */
+public class Import {
+  final static String NAME = "import";
+
+  /**
+   * Write table content out to files in hdfs.
+   */
+  static class Importer
+  extends TableMapper<ImmutableBytesWritable, Put> {
+    /**
+     * @param row  The current table row key.
+     * @param value  The columns.
+     * @param context  The current context.
+     * @throws IOException When something is broken with the data.
+     * @see org.apache.hadoop.mapreduce.Mapper#map(KEYIN, VALUEIN, 
+     *   org.apache.hadoop.mapreduce.Mapper.Context)
+     */
+    @Override
+    public void map(ImmutableBytesWritable row, Result value,
+      Context context)
+    throws IOException {
+      try {
+        context.write(row, resultToPut(row, value));
+      } catch (InterruptedException e) {
+        e.printStackTrace();
+      }
+    }
+
+    private static Put resultToPut(ImmutableBytesWritable key, Result result) 
+    throws IOException {
+      Put put = new Put(key.get());
+      for (KeyValue kv : result.raw()) {
+        put.add(kv);
+      }
+      return put;
+    }
+  }
+
+  /**
+   * Sets up the actual job.
+   * 
+   * @param conf  The current configuration.
+   * @param args  The command line parameters.
+   * @return The newly created job.
+   * @throws IOException When setting up the job fails.
+   */
+  public static Job createSubmittableJob(Configuration conf, String[] args) 
+  throws IOException {
+    String tableName = args[0];
+    Path inputDir = new Path(args[1]);
+    Job job = new Job(conf, NAME + "_" + tableName);
+    job.setJarByClass(Importer.class);
+    FileInputFormat.setInputPaths(job, inputDir);
+    job.setInputFormatClass(SequenceFileInputFormat.class);
+    job.setMapperClass(Importer.class);
+    // No reducers.  Just write straight to table.  Call initTableReducerJob
+    // because it sets up the TableOutputFormat.
+    TableMapReduceUtil.initTableReducerJob(tableName, null, job);
+    job.setNumReduceTasks(0);
+    return job;
+  }
+
+  /*
+   * @param errorMsg Error message.  Can be null.
+   */
+  private static void usage(final String errorMsg) {
+    if (errorMsg != null && errorMsg.length() > 0) {
+      System.err.println("ERROR: " + errorMsg);
+    }
+    System.err.println("Usage: Import <tablename> <inputdir>");
+  }
+
+  /**
+   * Main entry point.
+   * 
+   * @param args  The command line parameters.
+   * @throws Exception When running the job fails.
+   */
+  public static void main(String[] args) throws Exception {
+    HBaseConfiguration conf = new HBaseConfiguration();
+    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
+    if (otherArgs.length < 2) {
+      usage("Wrong number of arguments: " + otherArgs.length);
+      System.exit(-1);
+    }
+    Job job = createSubmittableJob(conf, otherArgs);
+    System.exit(job.waitForCompletion(true) ? 0 : 1);
+  }
+}
\ No newline at end of file



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