amogh-jahagirdar commented on code in PR #13400: URL: https://github.com/apache/iceberg/pull/13400#discussion_r2356881442
########## core/src/main/java/org/apache/iceberg/ScanTasksIterable.java: ########## @@ -0,0 +1,217 @@ +/* + * 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.iceberg; + +import java.io.IOException; +import java.util.List; +import java.util.Map; +import java.util.concurrent.ExecutorService; +import java.util.function.Supplier; +import org.apache.iceberg.catalog.TableIdentifier; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.io.CloseableIterator; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; +import org.apache.iceberg.rest.ErrorHandlers; +import org.apache.iceberg.rest.ParserContext; +import org.apache.iceberg.rest.RESTClient; +import org.apache.iceberg.rest.ResourcePaths; +import org.apache.iceberg.rest.requests.FetchScanTasksRequest; +import org.apache.iceberg.rest.responses.FetchScanTasksResponse; +import org.apache.iceberg.util.ParallelIterable; + +public class ScanTasksIterable implements CloseableIterable<FileScanTask> { + private final RESTClient client; + private final ResourcePaths resourcePaths; + private final TableIdentifier tableIdentifier; + private final Supplier<Map<String, String>> headers; + // parallelizing on this where a planTask produces a list of file scan tasks, as + // well more planTasks. + private final String planTask; + private final List<FileScanTask> fileScanTasks; + private final ExecutorService executorService; + private final Map<Integer, PartitionSpec> specsById; + private final boolean caseSensitive; + + public ScanTasksIterable( + String planTask, + RESTClient client, + ResourcePaths resourcePaths, + TableIdentifier tableIdentifier, + Supplier<Map<String, String>> headers, + ExecutorService executorService, + Map<Integer, PartitionSpec> specsById, + boolean caseSensitive) { + this.planTask = planTask; + this.fileScanTasks = null; + this.client = client; + this.resourcePaths = resourcePaths; + this.tableIdentifier = tableIdentifier; + this.headers = headers; + this.executorService = executorService; + this.specsById = specsById; + this.caseSensitive = caseSensitive; + } + + public ScanTasksIterable( + List<FileScanTask> fileScanTasks, + RESTClient client, + ResourcePaths resourcePaths, + TableIdentifier tableIdentifier, + Supplier<Map<String, String>> headers, + ExecutorService executorService, + Map<Integer, PartitionSpec> specsById, + boolean caseSensitive) { + this.planTask = null; + this.fileScanTasks = fileScanTasks; + this.client = client; + this.resourcePaths = resourcePaths; + this.tableIdentifier = tableIdentifier; + this.headers = headers; + this.executorService = executorService; + this.specsById = specsById; + this.caseSensitive = caseSensitive; + } + + @Override + public CloseableIterator<FileScanTask> iterator() { + return new ScanTasksIterator( + planTask, + fileScanTasks, + client, + resourcePaths, + tableIdentifier, + headers, + executorService, + specsById, + caseSensitive); + } + + @Override + public void close() throws IOException {} + + private static class ScanTasksIterator implements CloseableIterator<FileScanTask> { + private final RESTClient client; + private final ResourcePaths resourcePaths; + private final TableIdentifier tableIdentifier; + private final Supplier<Map<String, String>> headers; + private String planTask; + private final List<FileScanTask> fileScanTasks; + private final ExecutorService executorService; + private final Map<Integer, PartitionSpec> specsById; + private final boolean caseSensitive; + + ScanTasksIterator( + String planTask, + List<FileScanTask> fileScanTasks, + RESTClient client, + ResourcePaths resourcePaths, + TableIdentifier tableIdentifier, + Supplier<Map<String, String>> headers, + ExecutorService executorService, + Map<Integer, PartitionSpec> specsById, + boolean caseSensitive) { + this.client = client; + this.resourcePaths = resourcePaths; + this.tableIdentifier = tableIdentifier; + this.headers = headers; + this.planTask = planTask; + this.fileScanTasks = fileScanTasks != null ? fileScanTasks : Lists.newArrayList(); + this.executorService = executorService; + this.specsById = specsById; + this.caseSensitive = caseSensitive; + } + + @Override + public boolean hasNext() { + if (!fileScanTasks.isEmpty()) { + // Have file scan tasks so continue to consume + return true; + } + // Out of file scan tasks, so need to now fetch more from each planTask + // Service can send back more planTasks which acts as pagination + if (planTask != null) { + fetchScanTasks(planTask); + planTask = null; + // Make another hasNext() call, as more fileScanTasks have been fetched + return hasNext(); + } + // we have no file scan tasks left to consume + // so means we are finished + return false; + } + + @Override + public FileScanTask next() { + return fileScanTasks.remove(0); + } + + private void fetchScanTasks(String withPlanTask) { + FetchScanTasksRequest fetchScanTasksRequest = new FetchScanTasksRequest(withPlanTask); + // we need injectable values here + ParserContext parserContext = + ParserContext.builder() + .add("specsById", specsById) + .add("caseSensitive", caseSensitive) + .build(); + FetchScanTasksResponse response = + client.post( + resourcePaths.fetchScanTasks(tableIdentifier), + fetchScanTasksRequest, + FetchScanTasksResponse.class, + headers.get(), + ErrorHandlers.defaultErrorHandler(), + stringStringMap -> {}, + parserContext); + if (response.fileScanTasks() != null) { + fileScanTasks.addAll(response.fileScanTasks()); + } + + if (response.planTasks() != null) { + // this is the case where a plan task returned an additional plan task, so ensure that this + // result is added to top level fileScanTasks list. + // confirmed working with catalog test + // #testPlanTableScanAndFetchScanTasksWithCompletedStatusAndNestedPlanTasks + Iterable<FileScanTask> fileScanTasksFromPlanTasks = + getScanTasksIterable(response.planTasks()); + fileScanTasksFromPlanTasks.forEach(fileScanTasks::add); + } + } + + public CloseableIterable<FileScanTask> getScanTasksIterable(List<String> planTasks) { + List<ScanTasksIterable> iterableOfScanTaskIterables = Lists.newArrayList(); + for (String withPlanTask : planTasks) { + ScanTasksIterable iterable = + new ScanTasksIterable( + withPlanTask, + client, + resourcePaths, + tableIdentifier, + headers, + executorService, + specsById, + caseSensitive); + iterableOfScanTaskIterables.add(iterable); + } + return new ParallelIterable<>(iterableOfScanTaskIterables, executorService); + } + + @Override + public void close() throws IOException {} Review Comment: sorry missed this, yeah I think we should implement the close->cancel logic upfront. It'll be important for any engines which are enforcing limits , they would then stop the task generation/requests and free up resources from the server -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
