| /* |
| * 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.test; |
| |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.SortedSet; |
| import java.util.TreeSet; |
| |
| import org.apache.accumulo.core.client.Accumulo; |
| import org.apache.accumulo.core.client.AccumuloClient; |
| import org.apache.accumulo.core.client.Scanner; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.accumulo.core.metadata.MetadataTable; |
| import org.apache.accumulo.core.metadata.RootTable; |
| import org.apache.accumulo.core.metadata.schema.MetadataSchema.TabletsSection; |
| import org.apache.accumulo.core.metadata.schema.MetadataSchema.TabletsSection.CurrentLocationColumnFamily; |
| import org.apache.accumulo.core.metadata.schema.MetadataSchema.TabletsSection.TabletColumnFamily; |
| import org.apache.accumulo.core.security.Authorizations; |
| import org.apache.accumulo.test.functional.ConfigurableMacBase; |
| import org.apache.hadoop.io.Text; |
| import org.junit.Test; |
| |
| import com.google.common.collect.Iterators; |
| |
| public class WaitForBalanceIT extends ConfigurableMacBase { |
| |
| private static final int NUM_SPLITS = 50; |
| |
| @Override |
| public int defaultTimeoutSeconds() { |
| return 120; |
| } |
| |
| @Test |
| public void test() throws Exception { |
| try (AccumuloClient c = Accumulo.newClient().from(getClientProperties()).build()) { |
| // ensure the metadata table is online |
| Iterators.size(c.createScanner(MetadataTable.NAME, Authorizations.EMPTY).iterator()); |
| c.instanceOperations().waitForBalance(); |
| assertTrue(isBalanced(c)); |
| final String tableName = getUniqueNames(1)[0]; |
| c.tableOperations().create(tableName); |
| c.instanceOperations().waitForBalance(); |
| final SortedSet<Text> partitionKeys = new TreeSet<>(); |
| for (int i = 0; i < NUM_SPLITS; i++) { |
| partitionKeys.add(new Text("" + i)); |
| } |
| c.tableOperations().addSplits(tableName, partitionKeys); |
| assertFalse(isBalanced(c)); |
| c.instanceOperations().waitForBalance(); |
| assertTrue(isBalanced(c)); |
| } |
| } |
| |
| private boolean isBalanced(AccumuloClient c) throws Exception { |
| final Map<String,Integer> counts = new HashMap<>(); |
| int offline = 0; |
| for (String tableName : new String[] {MetadataTable.NAME, RootTable.NAME}) { |
| try (Scanner s = c.createScanner(tableName, Authorizations.EMPTY)) { |
| s.setRange(TabletsSection.getRange()); |
| s.fetchColumnFamily(CurrentLocationColumnFamily.NAME); |
| TabletColumnFamily.PREV_ROW_COLUMN.fetch(s); |
| String location = null; |
| for (Entry<Key,Value> entry : s) { |
| Key key = entry.getKey(); |
| if (key.getColumnFamily().equals(CurrentLocationColumnFamily.NAME)) { |
| location = key.getColumnQualifier().toString(); |
| } else if (TabletColumnFamily.PREV_ROW_COLUMN.hasColumns(key)) { |
| if (location == null) { |
| offline++; |
| } else { |
| Integer count = counts.get(location); |
| if (count == null) |
| count = 0; |
| count = count + 1; |
| counts.put(location, count); |
| } |
| location = null; |
| } |
| } |
| } |
| } |
| // the replication table is expected to be offline for this test, so ignore it |
| if (offline > 1) { |
| System.out.println("Offline tablets " + offline); |
| return false; |
| } |
| int average = 0; |
| for (Integer i : counts.values()) { |
| average += i; |
| } |
| average /= counts.size(); |
| System.out.println(counts); |
| int tablesCount = c.tableOperations().list().size(); |
| for (Entry<String,Integer> hostCount : counts.entrySet()) { |
| if (Math.abs(average - hostCount.getValue()) > tablesCount) { |
| System.out.println( |
| "Average " + average + " count " + hostCount.getKey() + ": " + hostCount.getValue()); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| } |