/* * 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.eagle.log.entity.index; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.NavigableMap; import org.apache.eagle.common.config.EagleConfigFactory; import org.apache.eagle.log.entity.HBaseInternalLogHelper; import org.apache.eagle.log.entity.InternalLog; import org.apache.eagle.log.entity.meta.IndexDefinition; import org.apache.hadoop.hbase.client.Get; import org.apache.hadoop.hbase.client.HTableFactory; import org.apache.hadoop.hbase.client.HTableInterface; import org.apache.hadoop.hbase.client.Result; import org.apache.hadoop.hbase.filter.Filter; public class UniqueIndexLogReader extends IndexLogReader { private final IndexDefinition indexDef; private final List<byte[]> indexRowkeys; private final byte[][] qualifiers; private final Filter filter; private HTableInterface tbl; private boolean isOpen = false; private Result[] entityResults; private int index = -1; public UniqueIndexLogReader(IndexDefinition indexDef, List<byte[]> indexRowkeys, byte[][] qualifiers, Filter filter) { this.indexDef = indexDef; this.indexRowkeys = indexRowkeys; this.qualifiers = qualifiers; this.filter = filter; } @Override public void open() throws IOException { if (isOpen) { return; // silently return } try { tbl = EagleConfigFactory.load().getHTable(indexDef.getEntityDefinition().getTable()); } catch (RuntimeException ex) { throw new IOException(ex); } final byte[] family = indexDef.getEntityDefinition().getColumnFamily().getBytes(); final List<Get> indexGets = new ArrayList<>(); for (byte[] rowkey : indexRowkeys) { Get get = new Get(rowkey); // Return all index qualifiers get.addFamily(family); indexGets.add(get); } final Result[] indexResults = tbl.get(indexGets); indexGets.clear(); for (Result indexResult : indexResults) { final NavigableMap<byte[], byte[]> map = indexResult.getFamilyMap(family); if (map == null) { continue; } for (byte[] entityRowkey : map.keySet()) { Get get = new Get(entityRowkey); if (filter != null) { get.setFilter(filter); } if (qualifiers == null) { // filter all qualifiers if output qualifiers are null get.addFamily(family); } else { for (int i = 0; i < qualifiers.length; ++i) { // Return the specified qualifiers get.addColumn(family, qualifiers[i]); } } workaroundHBASE2198(get, filter, qualifiers); indexGets.add(get); } } entityResults = tbl.get(indexGets); isOpen = true; } @Override public void close() throws IOException { if (tbl != null) { new HTableFactory().releaseHTableInterface(tbl); } } @Override public InternalLog read() throws IOException { if (entityResults == null) { throw new IllegalArgumentException("entityResults haven't been initialized before reading"); } InternalLog t = null; while (entityResults.length > ++index) { Result r = entityResults[index]; if (r != null) { if (r.getRow() == null) { continue; } t = HBaseInternalLogHelper.parse(indexDef.getEntityDefinition(), r, qualifiers); break; } } return t; } }