org.apache.bigtop.itest.hbase.system.Scanner.java Source code

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Here is the source code for org.apache.bigtop.itest.hbase.system.Scanner.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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.bigtop.itest.hbase.system;

import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Map.Entry;
import java.util.NavigableMap;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
import org.apache.hadoop.hbase.util.Bytes;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;

/**
 * This program scans a table a configurable number of times. Uses 
 * the table record reader.
 */
public class Scanner {
    public static final Log LOG = LogFactory.getLog(Scanner.class);

    public static int doScan(HTable table, int val) throws IOException, InterruptedException {
        Scan s = new Scan();
        byte[] start = {};
        byte[] stop = {};
        byte[] value = Bytes.toBytes(String.format("%010d", val));
        s.setStartRow(start);
        s.setStopRow(stop);
        SingleColumnValueFilter filter = new SingleColumnValueFilter(Bytes.toBytes("f1"), Bytes.toBytes("qual"),
                CompareOp.EQUAL, value);
        s.setFilter(filter);

        // Keep track of gathered elements.
        Multimap<String, String> mm = ArrayListMultimap.create();

        // Counts
        int cnt = 0;
        long i = 0;
        ResultScanner rs = table.getScanner(s);
        for (Result r : rs) {
            if (r.getRow() == null) {
                continue;
            }

            NavigableMap<byte[], NavigableMap<byte[], NavigableMap<Long, byte[]>>> columnFamilyMap = r.getMap();

            // Output time to show if flush related.
            String k = Bytes.toStringBinary(r.getRow());
            if (mm.get(k).size() >= 1) {
                System.out.println("Duplicate rowkey " + k);
                LOG.error("Duplicate rowkey " + k);
            }

            mm.put(Bytes.toStringBinary(r.getRow()), i + ": " + r);
            cnt++;
            i++;
        }

        System.out.println("scan items counted: " + cnt + " for scan " + s.toString() + " with filter f1:qual == "
                + Bytes.toString(value));

        // Print out dupes.
        int dupes = 0;
        for (Entry<String, Collection<String>> e : mm.asMap().entrySet()) {
            if (e.getValue().size() > 1) {
                dupes++;
                System.out.print("Row " + e.getKey() + " had time stamps: ");
                String[] tss = e.getValue().toArray(new String[0]);
                System.out.println(Arrays.toString(tss));
            }
        }

        return dupes;
    }

    public static void main(String argv[]) throws IOException {
        if (argv.length < 2) {
            System.err.println("usage: " + Scanner.class.getSimpleName() + " <table> <value>");
            System.err.println(" <value>: a numeric value [0,500)");
            System.exit(1);
        }
        Configuration conf = HBaseConfiguration.create();

        byte[] tableName = Bytes.toBytes(argv[0]);
        int val = Integer.parseInt(argv[1]);
        int loops = 1;
        for (int i = 1; i < argv.length; i++) {
            if (argv[i].equals("-l")) {
                i++;
                loops = Integer.parseInt(argv[i]);
            }
        }

        HTable table = new HTable(conf, tableName);
        int exitVal = 0;
        for (int i = 0; i < loops; i++) {
            try {
                exitVal = doScan(table, val);
            } catch (IOException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            if (exitVal != 0) {
                break;
            }
        }
        System.exit(exitVal);
    }
}