| /* |
| * 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.examples.constraints; |
| |
| import java.util.Collections; |
| import java.util.List; |
| |
| 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.BatchWriter; |
| import org.apache.accumulo.core.client.MutationsRejectedException; |
| import org.apache.accumulo.core.client.TableNotFoundException; |
| import org.apache.accumulo.core.data.Mutation; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.accumulo.core.data.constraints.Constraint; |
| import org.apache.accumulo.examples.Common; |
| import org.apache.accumulo.examples.cli.ClientOpts; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Ensure that mutations are a reasonable size: we must be able to fit several in memory at a time. |
| */ |
| public class MaxMutationSize implements Constraint { |
| |
| private static final Logger log = LoggerFactory.getLogger(MaxMutationSize.class); |
| |
| static final long MAX_SIZE = Runtime.getRuntime().maxMemory() >> 8; |
| static final List<Short> empty = Collections.emptyList(); |
| static final List<Short> violations = Collections.singletonList((short) 0); |
| |
| @Override |
| public String getViolationDescription(short violationCode) { |
| return String.format("mutation exceeded maximum size of %d", MAX_SIZE); |
| } |
| |
| @Override |
| public List<Short> check(Environment env, Mutation mutation) { |
| if (mutation.estimatedMemoryUsed() < MAX_SIZE) |
| return empty; |
| return violations; |
| } |
| |
| public static void main(String[] args) |
| throws AccumuloException, AccumuloSecurityException, TableNotFoundException { |
| ClientOpts opts = new ClientOpts(); |
| opts.parseArgs(MaxMutationSize.class.getName(), args); |
| |
| try (AccumuloClient client = Accumulo.newClient().from(opts.getClientPropsPath()).build()) { |
| Common.createTableWithNamespace(client, ConstraintsCommon.CONSTRAINTS_TABLE); |
| |
| /* |
| * Add the {@link MaxMutationSize} constraint to the table. Be sure to use the fully qualified |
| * class name |
| */ |
| int num = client.tableOperations().addConstraint(ConstraintsCommon.CONSTRAINTS_TABLE, |
| "org.apache.accumulo.examples.constraints.MaxMutationSize"); |
| |
| log.info("Attempting to write a lot of mutations to testConstraints"); |
| try (BatchWriter bw = client.createBatchWriter(ConstraintsCommon.CONSTRAINTS_TABLE)) { |
| Mutation m = new Mutation("r1"); |
| for (int i = 0; i < 1_000_000; i++) |
| m.put("cf" + i % 5000, "cq" + i, new Value(("value" + i).getBytes())); |
| bw.addMutation(m); |
| } catch (MutationsRejectedException e) { |
| e.getConstraintViolationSummaries() |
| .forEach(m -> log.error(ConstraintsCommon.CONSTRAINT_VIOLATED_MSG, m.constrainClass)); |
| } |
| client.tableOperations().removeConstraint(ConstraintsCommon.CONSTRAINTS_TABLE, num); |
| } |
| } |
| } |