jihoonson commented on a change in pull request #9057: [new feature] Add HBase2 Indexer URL: https://github.com/apache/druid/pull/9057#discussion_r381112138
########## File path: extensions-contrib/druid-hbase2-indexing/src/main/java/org/apache/druid/indexer/hbase2/HBaseFirehose.java ########## @@ -0,0 +1,161 @@ +/* + * 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.druid.indexer.hbase2; + +import org.apache.druid.data.input.Firehose; +import org.apache.druid.data.input.InputRow; +import org.apache.druid.data.input.InputRowListPlusRawValues; +import org.apache.druid.data.input.impl.InputRowParser; +import org.apache.druid.java.util.common.parsers.ParseException; +import org.apache.hadoop.hbase.client.Result; +import org.apache.hadoop.hbase.client.ResultScanner; +import org.apache.hadoop.hbase.client.Scan; +import org.apache.logging.log4j.LogManager; +import org.apache.logging.log4j.Logger; + +import java.io.IOException; +import java.util.Iterator; +import java.util.NoSuchElementException; + +public abstract class HBaseFirehose implements Firehose +{ + + protected final Logger log = LogManager.getLogger(getClass()); + + protected final Iterator<Scan> scanIterator; + protected final InputRowParser<Result> parser; + + protected ResultScanner scanner; + protected Result result; + protected long readRows; + private boolean initialized; + + public HBaseFirehose(Iterator<Scan> scanIterator, InputRowParser<Result> parser) + { + this.scanIterator = scanIterator; + this.parser = parser; + } + + @Override + public boolean hasMore() + { + if (!initialized) { + nextResult(); + initialized = true; + } + + boolean more = result != null; + if (!more) { + if (log.isInfoEnabled()) { + log.info("Total read rows: {}", readRows); + } + } + + return more; + } + + private ResultScanner getNextScanner() throws IOException + { + if (scanner != null) { + scanner.close(); + } + + Scan scan = scanIterator.next(); + + if (log.isDebugEnabled()) { + log.debug("scan: {}", scan); + } + + scanner = createScanner(scan); + + return scanner; + } + + protected abstract ResultScanner createScanner(Scan scan) throws IOException; + + @Override + public InputRow nextRow() + { + InputRow inputRow; + + if (result == null) { + result = nextResult(); + } + + if (log.isTraceEnabled()) { + log.trace("result[{}]: {}", readRows, result); + } + + if (result == null) { + throw new NoSuchElementException(); + } + + inputRow = parser.parseBatch(result).get(0); + readRows++; + result = nextResult(); + + return inputRow; + } + + private Result nextResult() + { + try { + if ((scanner == null || (result = scanner.next()) == null) && scanIterator.hasNext()) { + scanner = getNextScanner(); + + result = scanner.next(); + } + } + catch (IOException e) { + throw new RuntimeException(e); + } + + return result; + } + + @SuppressWarnings("deprecation") + @Override + public InputRowListPlusRawValues nextRowWithRaw() + { + if (!hasMore()) { + throw new NoSuchElementException(); + } + + try { + InputRow inputRow = parser.parse(result); + return InputRowListPlusRawValues.of(inputRow, null); + } + catch (ParseException e) { + return InputRowListPlusRawValues.of(null, e); + } + finally { + result = null; + } + } + + @Override + public void close() throws IOException + { + if (log.isInfoEnabled()) { + log.info("Read rows until close: {}", readRows); Review comment: Is `readRows` for debugging? If so, please remove it. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
