/* * Copyright 2015 Kakao Corporation * * Licensed 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 com.kakao.hbase.specific; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HRegionInfo; import org.apache.hadoop.hbase.ServerName; import org.apache.hadoop.hbase.client.*; import org.apache.hadoop.hbase.filter.FilterList; import org.apache.hadoop.hbase.filter.FirstKeyOnlyFilter; import org.apache.hadoop.hbase.filter.KeyOnlyFilter; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.NavigableMap; public class RegionLocationCleaner implements Runnable { public static final Object LOCK = new Object(); public static final int THREAD_POOL_SIZE = 5; private static HConnection connection = null; private final String tableName; private final NavigableMap<HRegionInfo, ServerName> regionServerMap; public RegionLocationCleaner(String tableName, Configuration conf, NavigableMap<HRegionInfo, ServerName> regionServerMap) throws IOException { this.tableName = tableName; if (connection == null) { connection = HConnectionManager.createConnection(conf); } this.regionServerMap = regionServerMap; } @Override public void run() { try (HTableInterface table = connection.getTable(tableName.getBytes())) { // Do not use Get not to increase read request count metric. // Use Scan. Scan scan = new Scan("".getBytes(), "".getBytes()); FilterList filterList = new FilterList(); filterList.addFilter(new KeyOnlyFilter()); filterList.addFilter(new FirstKeyOnlyFilter()); scan.setFilter(filterList); //noinspection EmptyTryBlock try(ResultScanner ignored = table.getScanner(scan)) { } return; } catch (IOException ignore) { } clean(tableName); } private void clean(String tableName) { synchronized (LOCK) { List<HRegionInfo> toRemoveList = new ArrayList<>(); for (HRegionInfo hRegionInfo : regionServerMap.keySet()) { if (CommandAdapter.getTableName(hRegionInfo).equals(tableName)) { toRemoveList.add(hRegionInfo); } } for (HRegionInfo hRegionInfo : toRemoveList) { regionServerMap.remove(hRegionInfo); } } } }