| /* |
| * 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.accumulo.testing.stress; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.Random; |
| |
| import org.apache.accumulo.core.client.Accumulo; |
| import org.apache.accumulo.core.client.AccumuloClient; |
| import org.apache.accumulo.core.client.AccumuloException; |
| import org.apache.accumulo.core.client.AccumuloSecurityException; |
| import org.apache.accumulo.core.client.Scanner; |
| import org.apache.accumulo.core.client.TableNotFoundException; |
| import org.apache.accumulo.core.client.admin.TableOperations; |
| import org.apache.accumulo.core.data.Range; |
| import org.apache.accumulo.core.security.Authorizations; |
| import org.apache.hadoop.io.Text; |
| |
| import com.google.common.collect.Lists; |
| |
| public class Scan { |
| |
| public static void main(String[] args) throws Exception { |
| ScanOpts opts = new ScanOpts(); |
| opts.parseArgs(Scan.class.getName(), args); |
| |
| try (AccumuloClient client = Accumulo.newClient().from(opts.getClientProps()).build(); |
| Scanner scanner = client.createScanner(opts.tableName, new Authorizations())) { |
| if (opts.isolate) { |
| scanner.enableIsolation(); |
| } |
| |
| Random tablet_index_generator = new Random(opts.scan_seed); |
| |
| LoopControl scanning_condition = opts.continuous ? new ContinuousLoopControl() |
| : new IterativeLoopControl(opts.scan_iterations); |
| |
| while (scanning_condition.keepScanning()) { |
| Range range = pickRange(client.tableOperations(), opts.tableName, tablet_index_generator); |
| scanner.setRange(range); |
| if (opts.batch_size > 0) { |
| scanner.setBatchSize(opts.batch_size); |
| } |
| try { |
| consume(scanner); |
| } catch (Exception e) { |
| System.err.println(String.format( |
| "Exception while scanning range %s. Check the state of Accumulo for errors.", range)); |
| throw e; |
| } |
| } |
| } |
| } |
| |
| public static void consume(Iterable<?> iterable) { |
| Iterator<?> itr = iterable.iterator(); |
| while (itr.hasNext()) { |
| itr.next(); |
| } |
| } |
| |
| public static Range pickRange(TableOperations tops, String table, Random r) |
| throws TableNotFoundException, AccumuloSecurityException, AccumuloException { |
| ArrayList<Text> splits = Lists.newArrayList(tops.listSplits(table)); |
| if (splits.isEmpty()) { |
| return new Range(); |
| } else { |
| int index = r.nextInt(splits.size()); |
| Text endRow = splits.get(index); |
| Text startRow = index == 0 ? null : splits.get(index - 1); |
| return new Range(startRow, false, endRow, true); |
| } |
| } |
| |
| /* |
| * These interfaces + implementations are used to determine how many times the scanner should look |
| * up a random tablet and scan it. |
| */ |
| static interface LoopControl { |
| public boolean keepScanning(); |
| } |
| |
| // Does a finite number of iterations |
| static class IterativeLoopControl implements LoopControl { |
| private final int max; |
| private int current; |
| |
| public IterativeLoopControl(int max) { |
| this.max = max; |
| this.current = 0; |
| } |
| |
| @Override |
| public boolean keepScanning() { |
| if (current < max) { |
| ++current; |
| return true; |
| } else { |
| return false; |
| } |
| } |
| } |
| |
| // Does an infinite number of iterations |
| static class ContinuousLoopControl implements LoopControl { |
| @Override |
| public boolean keepScanning() { |
| return true; |
| } |
| } |
| } |