/**
*
* 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.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
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.Result;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.filter.CompareFilter;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.PrefixFilter;
import org.apache.hadoop.hbase.filter.RegexStringComparator;
import org.apache.hadoop.hbase.filter.RowFilter;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
import com.google.common.base.Preconditions;
/**
* A job with a a map and reduce phase to count cells in a table.
* The counter lists the following stats for a given table:
* <pre>
* 1. Total number of rows in the table
* 2. Total number of CFs across all rows
* 3. Total qualifiers across all rows
* 4. Total occurrence of each CF
* 5. Total occurrence of each qualifier
* 6. Total number of versions of each qualifier.
* </pre>
*
* The cellcounter takes two optional parameters one to use a user
* supplied row/family/qualifier string to use in the report and
* second a regex based or prefix based row filter to restrict the
* count operation to a limited subset of rows from the table.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class CellCounter {
private static final Log LOG =
LogFactory.getLog(CellCounter.class.getName());
/**
* Name of this 'program'.
*/
static final String NAME = "CellCounter";
/**
* Mapper that runs the count.
*/
static class CellCounterMapper
extends TableMapper<Text, IntWritable> {
/**
* Counter enumeration to count the actual rows.
*/
public static enum Counters {
ROWS
}
/**
* Maps the data.
*
* @param row The current table row key.
* @param values 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 values,
Context context)
throws IOException {
Preconditions.checkState(values != null,
"values passed to the map is null");
String currentFamilyName = null;
String currentQualifierName = null;
String currentRowKey = null;
Configuration config = context.getConfiguration();
String separator = config.get("ReportSeparator",":");
try {
context.getCounter(Counters.ROWS).increment(1);
context.write(new Text("Total ROWS"), new IntWritable(1));
for (KeyValue value : values.list()) {
currentRowKey = Bytes.toStringBinary(value.getRow());
String thisRowFamilyName = Bytes.toStringBinary(value.getFamily());
if (thisRowFamilyName != null &&
!thisRowFamilyName.equals(currentFamilyName)) {
currentFamilyName = thisRowFamilyName;
context.getCounter("CF", thisRowFamilyName).increment(1);
context.write(new Text("Total Families Across all Rows"),
new IntWritable(1));
context.write(new Text(thisRowFamilyName), new IntWritable(1));
}
String thisRowQualifierName = thisRowFamilyName + separator
+ Bytes.toStringBinary(value.getQualifier());
if (thisRowQualifierName != null &&
!thisRowQualifierName.equals(currentQualifierName)) {
currentQualifierName = thisRowQualifierName;
context.getCounter("CFQL", thisRowQualifierName).increment(1);
context.write(new Text("Total Qualifiers across all Rows"),
new IntWritable(1));
context.write(new Text(thisRowQualifierName), new IntWritable(1));
// Intialize versions
context.getCounter("QL_VERSIONS", currentRowKey + separator +
thisRowQualifierName).increment(1);
context.write(new Text(currentRowKey + separator
+ thisRowQualifierName + "_Versions"), new IntWritable(1));
} else {
// Increment versions
currentQualifierName = thisRowQualifierName;
context.getCounter("QL_VERSIONS", currentRowKey + separator +
thisRowQualifierName).increment(1);
context.write(new Text(currentRowKey + separator
+ thisRowQualifierName + "_Versions"), new IntWritable(1));
}
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
static class IntSumReducer<Key> extends Reducer<Key, IntWritable,
Key, IntWritable> {
private IntWritable result = new IntWritable();
public void reduce(Key key, Iterable<IntWritable> values,
Context context)
throws IOException, InterruptedException {
int sum = 0;
for (IntWritable val : values) {
sum += val.get();
}
result.set(sum);
context.write(key, result);
}
}
/**
* 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]);
String reportSeparatorString = (args.length > 2) ? args[2]: ":";
conf.set("ReportSeparator", reportSeparatorString);
Job job = new Job(conf, NAME + "_" + tableName);
job.setJarByClass(CellCounter.class);
Scan scan = getConfiguredScanForJob(conf, args);
TableMapReduceUtil.initTableMapperJob(tableName, scan,
CellCounterMapper.class, ImmutableBytesWritable.class, Result.class, job);
job.setNumReduceTasks(1);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(IntWritable.class);
job.setOutputFormatClass(TextOutputFormat.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
FileOutputFormat.setOutputPath(job, outputDir);
job.setReducerClass(IntSumReducer.class);
return job;
}
private static Scan getConfiguredScanForJob(Configuration conf, String[] args) throws IOException {
Scan s = new Scan();
// Set Scan Versions
s.setMaxVersions(Integer.MAX_VALUE);
s.setCacheBlocks(false);
// Set Scan Column Family
if (conf.get(TableInputFormat.SCAN_COLUMN_FAMILY) != null) {
s.addFamily(Bytes.toBytes(conf.get(TableInputFormat.SCAN_COLUMN_FAMILY)));
}
// Set RowFilter or Prefix Filter if applicable.
Filter rowFilter = getRowFilter(args);
if (rowFilter!= null) {
LOG.info("Setting Row Filter for counter.");
s.setFilter(rowFilter);
}
return s;
}
private static Filter getRowFilter(String[] args) {
Filter rowFilter = null;
String filterCriteria = (args.length > 3) ? args[3]: null;
if (filterCriteria == null) return null;
if (filterCriteria.startsWith("^")) {
String regexPattern = filterCriteria.substring(1, filterCriteria.length());
rowFilter = new RowFilter(CompareFilter.CompareOp.EQUAL, new RegexStringComparator(regexPattern));
} else {
rowFilter = new PrefixFilter(Bytes.toBytes(filterCriteria));
}
return rowFilter;
}
/**
* Main entry point.
*
* @param args The command line parameters.
* @throws Exception When running the job fails.
*/
public static void main(String[] args) throws Exception {
Configuration conf = HBaseConfiguration.create();
String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
if (otherArgs.length < 1) {
System.err.println("ERROR: Wrong number of parameters: " + args.length);
System.err.println("Usage: CellCounter <tablename> <outputDir> <reportSeparator> " +
"[^[regex pattern] or [Prefix] for row filter]] ");
System.err.println(" Note: -D properties will be applied to the conf used. ");
System.err.println(" Additionally, the following SCAN properties can be specified");
System.err.println(" to get fine grained control on what is counted..");
System.err.println(" -D " + TableInputFormat.SCAN_COLUMN_FAMILY + "=<familyName>");
System.err.println(" <reportSeparator> parameter can be used to override the default report separator " +
"string : used to separate the rowId/column family name and qualifier name.");
System.err.println(" [^[regex pattern] or [Prefix] parameter can be used to limit the cell counter count " +
"operation to a limited subset of rows from the table based on regex or prefix pattern.");
System.exit(-1);
}
Job job = createSubmittableJob(conf, otherArgs);
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}