vinson0526 commented on a change in pull request #2228: add spark-doris-connector extension URL: https://github.com/apache/incubator-doris/pull/2228#discussion_r348969582
########## File path: extension/spark-doris-connector/src/main/java/org/apache/doris/spark/backend/BackendClient.java ########## @@ -0,0 +1,219 @@ +// 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.doris.spark.backend; + +import org.apache.doris.spark.cfg.ConfigurationOptions; +import org.apache.doris.spark.exception.ConnectedFailedException; +import org.apache.doris.spark.util.ErrorMessages; +import org.apache.doris.spark.cfg.Settings; +import org.apache.doris.spark.serialization.Routing; +import org.apache.doris.thrift.TDorisExternalService; +import org.apache.doris.thrift.TScanBatchResult; +import org.apache.doris.thrift.TScanCloseParams; +import org.apache.doris.thrift.TScanCloseResult; +import org.apache.doris.thrift.TScanNextBatchParams; +import org.apache.doris.thrift.TScanOpenParams; +import org.apache.doris.thrift.TScanOpenResult; +import org.apache.doris.thrift.TStatusCode; +import org.apache.thrift.TException; +import org.apache.thrift.protocol.TBinaryProtocol; +import org.apache.thrift.protocol.TProtocol; +import org.apache.thrift.transport.TSocket; +import org.apache.thrift.transport.TTransport; +import org.apache.thrift.transport.TTransportException; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Client to request Doris BE + */ +public class BackendClient { + private static Logger logger = LoggerFactory.getLogger(BackendClient.class); + + private Routing routing; + + private TDorisExternalService.Client client; + private TTransport transport; + + private boolean isConnected = false; + private final int retries; + private final int socketTimeout; + private final int connectTimeout; + + public BackendClient(Routing routing, Settings settings) throws ConnectedFailedException { + this.routing = routing; + this.connectTimeout = settings.getIntegerProperty(ConfigurationOptions.DORIS_REQUEST_CONNECT_TIMEOUT_MS, + ConfigurationOptions.DORIS_REQUEST_CONNECT_TIMEOUT_DEFAULT); + this.socketTimeout = settings.getIntegerProperty(ConfigurationOptions.DORIS_REQUEST_READ_TIMEOUT_MS, + ConfigurationOptions.DORIS_REQUEST_READ_TIMEOUT_DEFAULT); + this.retries = settings.getIntegerProperty(ConfigurationOptions.DORIS_REQUEST_RETRIES, + ConfigurationOptions.DORIS_REQUEST_RETRIES_DEFAULT); + logger.trace("connect timeout set to '{}'.", this.connectTimeout); + logger.trace("socket timeout set to '{}'.", this.socketTimeout); + logger.trace("retries set to '{}'.", this.retries); + open(); + } + + private void open() throws ConnectedFailedException { + logger.trace("Open client to Doris BE '{}'.", routing); + TException ex = null; + for (int attempt = 0; !isConnected && attempt < retries; ++attempt) { + logger.debug("Attempt {} to connect {}.", attempt, routing); + TBinaryProtocol.Factory factory = new TBinaryProtocol.Factory(); + transport = new TSocket(routing.getHost(), routing.getPort(), socketTimeout, connectTimeout); + TProtocol protocol = factory.getProtocol(transport); + client = new TDorisExternalService.Client(protocol); + try { + logger.trace("Connect status before open transport to {} is '{}'.", routing, isConnected); + if (!transport.isOpen()) { + transport.open(); + isConnected = true; + } + } catch (TTransportException e) { + logger.warn(ErrorMessages.CONNECT_FAILED_MESSAGE, routing, e); + ex = e; + } + if (isConnected) { + logger.info("Success connect to {}.", routing); + break; + } + } + if (!isConnected) { + logger.error(ErrorMessages.CONNECT_FAILED_MESSAGE, routing); + throw new ConnectedFailedException(routing.toString(), ex); + } + } + + private void close() { + logger.trace("Connect status before close with '{}' is '{}'.", routing, isConnected); + isConnected = false; + if (null != client) { + client = null; + } + if ((transport != null) && transport.isOpen()) { + transport.close(); + logger.info("Closed a connection to {}.", routing); + } + } + + /** + * Open a scanner for reading Doris data. + * @param openParams thrift struct to required by request + * @return scan open result + * @throws ConnectedFailedException throw if cannot connect to Doris BE + */ + public TScanOpenResult openScanner(TScanOpenParams openParams) throws ConnectedFailedException { + logger.debug("OpenScanner to '{}', parameter is '{}'.", routing, openParams); + if (!isConnected) { + open(); + } + TException ex = null; + for (int attempt = 0; attempt < retries; ++attempt) { + logger.debug("Attempt {} to openScanner {}.", attempt, routing); + try { + TScanOpenResult result = client.open_scanner(openParams); + if (result == null) { + logger.warn("Open scanner result from {} is null.", routing); + continue; + } + if (!TStatusCode.OK.equals(result.getStatus().getStatus_code())) { + logger.warn("The status of open scanner result from {} is '{}', error message is: {}.", + routing, result.getStatus().getStatus_code(), result.getStatus().getError_msgs()); + continue; + } + return result; + } catch (TException e) { + logger.info("Open scanner from {} failed.", routing, e); + ex = e; + } + } + logger.error(ErrorMessages.CONNECT_FAILED_MESSAGE, routing); + throw new ConnectedFailedException(routing.toString(), ex); + } + + /** + * get next row batch from Doris BE + * @param nextBatchParams thrift struct to required by request + * @return scan batch result + * @throws ConnectedFailedException throw if cannot connect to Doris BE + */ + public TScanBatchResult getNext(TScanNextBatchParams nextBatchParams) throws ConnectedFailedException { + logger.debug("GetNext to '{}', parameter is '{}'.", routing, nextBatchParams); + if (!isConnected) { + open(); + } + TException ex = null; + for (int attempt = 0; attempt < retries; ++attempt) { + logger.debug("Attempt {} to getNext {}.", attempt, routing); + try { + TScanBatchResult result = client.get_next(nextBatchParams); + if (result == null) { + logger.warn("GetNext result from {} is null.", routing); + continue; + } + if (!TStatusCode.OK.equals(result.getStatus().getStatus_code())) { + logger.warn("The status of get next result from {} is '{}', error message is: {}.", + routing, result.getStatus().getStatus_code(), result.getStatus().getError_msgs()); + continue; + } + return result; + } catch (TException e) { + logger.info("Get next from {} failed.", routing, e); Review comment: done ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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