Changes between Initial Version and Version 1 of waue/2009/0728

Timestamp:

Jul 28, 2009, 5:38:17 PM (15 years ago)

Author:

waue

Comment:

--

waue/2009/0728

@@ +1 @@
+{{{
+
+/**
+ * Copyright 2008 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 hbase;
+
+import java.io.IOException;
+import java.util.Map;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.io.Cell;
+import org.apache.hadoop.hbase.io.HbaseMapWritable;
+import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
+import org.apache.hadoop.hbase.io.RowResult;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.mapred.FileOutputFormat;
+import org.apache.hadoop.mapred.JobClient;
+import org.apache.hadoop.mapred.JobConf;
+import org.apache.hadoop.mapred.OutputCollector;
+import org.apache.hadoop.mapred.Reporter;
+import org.apache.hadoop.mapred.lib.IdentityReducer;
+import org.apache.hadoop.util.Tool;
+import org.apache.hadoop.util.ToolRunner;
+
+/**
+ * A job with a map to count rows.
+ * Map outputs table rows IF the input row has columns that have content.  
+ * Uses an {@link IdentityReducer}
+ */
+public class RowCounter extends TableMap<ImmutableBytesWritable, RowResult> implements Tool {
+  /* Name of this 'program'
+   */
+  static final String NAME = "rowcounter";
+  
+  private Configuration conf;
+  private final RowResult EMPTY_RESULT_VALUE = 
+        new RowResult(Bytes.toBytes("dummy"),new HbaseMapWritable<byte [], Cell>());
+  private static enum Counters {ROWS}
+  
+  @Override
+  public void map(ImmutableBytesWritable row, RowResult value,
+    OutputCollector<ImmutableBytesWritable, RowResult> output,
+    @SuppressWarnings("unused") Reporter reporter)
+  throws IOException {
+    boolean content = false;
+    for (Map.Entry<byte [], Cell> e: value.entrySet()) {
+      Cell cell = e.getValue();
+      if (cell != null && cell.getValue().length > 0) {
+        content = true;
+        break;
+      }
+    }
+    if (!content) {
+      return;
+    }
+    // Give out same value every time.  We're only interested in the row/key
+    reporter.incrCounter(Counters.ROWS, 1);
+    output.collect(row, EMPTY_RESULT_VALUE);
+  }
+
+  /**
+   * @param args
+   * @return the JobConf
+   * @throws IOException
+   */
+  @SuppressWarnings({ "unused", "deprecation" })
+  public JobConf createSubmittableJob(String[] args) throws IOException {
+    JobConf c = new JobConf(getConf(), RowCounter.class);
+    c.setJobName(NAME);
+    // Columns are space delimited
+    StringBuilder sb = new StringBuilder();
+    final int columnoffset = 2;
+    for (int i = columnoffset; i < args.length; i++) {
+      if (i > columnoffset) {
+        sb.append(" ");
+      }
+      sb.append(args[i]);
+    }
+    // Second argument is the table name.
+    TableMap.initJob(args[1], sb.toString(), this.getClass(),
+      ImmutableBytesWritable.class, RowResult.class, c);
+    c.setReducerClass(IdentityReducer.class);
+    // First arg is the output directory.
+    FileOutputFormat.setOutputPath(c, new Path(args[0]));
+    return c;
+  }
+  
+  static int printUsage() {
+    System.out.println(NAME +
+      " <outputdir> <tablename> <column1> [<column2>...]");
+    return -1;
+  }
+  
+  public int run(final String[] args) throws Exception {
+    // Make sure there are at least 3 parameters
+    if (args.length < 3) {
+      System.err.println("ERROR: Wrong number of parameters: " + args.length);
+      return printUsage();
+    }
+    JobClient.runJob(createSubmittableJob(args));
+    return 0;
+  }
+
+  public Configuration getConf() {
+    return this.conf;
+  }
+
+  public void setConf(final Configuration c) {
+    this.conf = c;
+  }
+
+  /**
+   * @param args
+   * @throws Exception
+   */
+  public static void main(String[] args) throws Exception {
+         String[] argv = {"/user/waue/hba","t1","f2:c1"};
+         args = argv;
+    HBaseConfiguration c = new HBaseConfiguration();
+    int errCode = ToolRunner.run(c, new RowCounter(), args);
+    System.exit(errCode);
+  }
+}
+
+}}}