paul-rogers commented on a change in pull request #1892: Drill-7437: Storage Plugin for Generic HTTP REST API URL: https://github.com/apache/drill/pull/1892#discussion_r352254617
########## File path: contrib/storage-http/src/main/java/org/apache/drill/exec/store/http/HttpGroupScan.java ########## @@ -0,0 +1,137 @@ +/* + * 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.drill.exec.store.http; + +import java.util.List; +import org.apache.drill.common.expression.SchemaPath; + +import org.apache.drill.exec.physical.base.AbstractGroupScan; +import org.apache.drill.exec.physical.base.GroupScan; +import org.apache.drill.exec.physical.base.PhysicalOperator; +import org.apache.drill.exec.physical.base.ScanStats; +import org.apache.drill.exec.physical.base.ScanStats.GroupScanProperty; +import org.apache.drill.exec.physical.base.SubScan; +import org.apache.drill.exec.proto.CoordinationProtos.DrillbitEndpoint; +import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class HttpGroupScan extends AbstractGroupScan { + private static final Logger logger = LoggerFactory.getLogger(HttpGroupScan.class); + + private final List<SchemaPath> columns; + private final HttpScanSpec httpScanSpec; + private final HttpStoragePluginConfig httpStoragePluginConfig; + private boolean filterPushedDown = true; + + public HttpGroupScan ( + HttpStoragePluginConfig config, + HttpScanSpec scanSpec, + List<SchemaPath> columns + ) { + super("no-user"); + this.httpStoragePluginConfig = config; + this.httpScanSpec = scanSpec; + this.columns = columns == null || columns.size() == 0 ? ALL_COLUMNS : columns; + } + + public HttpGroupScan(HttpGroupScan that) { + super(that); + httpStoragePluginConfig = that.getStorageConfig(); + httpScanSpec = that.getScanSpec(); + columns = that.getColumns(); + } + + @Override + public void applyAssignments(List<DrillbitEndpoint> endpoints) { + logger.debug("HttpGroupScan applyAssignments"); + } + + @Override + public int getMaxParallelizationWidth() { + return 1; + } + + + @Override + public boolean canPushdownProjects(List<SchemaPath> columns) { + return true; + } + + @Override + public SubScan getSpecificScan(int minorFragmentId) { + logger.debug("HttpGroupScan getSpecificScan"); + return new HttpSubScan(httpStoragePluginConfig, httpScanSpec, columns); Review comment: This will be called once because `getMaxParallelizationWidth()` returns 1. Should this plugin allow sharding requests? If I'm requesting a time range, say, should the plugin try to split the time ranges into multiple small requests that Drill can spread across Drillbits? That is a VERY complex topic that I'm still trying to sort out... ---------------------------------------------------------------- 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: us...@infra.apache.org With regards, Apache Git Services
