nastra commented on code in PR #13400: URL: https://github.com/apache/iceberg/pull/13400#discussion_r2559858856
########## core/src/main/java/org/apache/iceberg/RESTTableScan.java: ########## @@ -0,0 +1,285 @@ +/* + * 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.util.List; +import java.util.Locale; +import java.util.Map; +import java.util.Set; +import java.util.function.Supplier; +import java.util.stream.Collectors; +import org.apache.iceberg.catalog.TableIdentifier; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.rest.Endpoint; +import org.apache.iceberg.rest.ErrorHandlers; +import org.apache.iceberg.rest.ParserContext; +import org.apache.iceberg.rest.PlanStatus; +import org.apache.iceberg.rest.RESTClient; +import org.apache.iceberg.rest.ResourcePaths; +import org.apache.iceberg.rest.requests.PlanTableScanRequest; +import org.apache.iceberg.rest.responses.FetchPlanningResultResponse; +import org.apache.iceberg.rest.responses.PlanTableScanResponse; +import org.apache.iceberg.types.Types; + +public class RESTTableScan extends DataTableScan { + private final RESTClient client; + private final String path; + private final Supplier<Map<String, String>> headers; + private final TableOperations operations; + private final Table table; + private final ResourcePaths resourcePaths; + private final TableIdentifier tableIdentifier; + private final Set<Endpoint> supportedEndpoints; + private final ParserContext parserContext; + + // Track the current plan ID for cancellation + private volatile String currentPlanId = null; + + // TODO revisit if this property should be configurable + // Sleep duration between polling attempts for plan completion + private static final int FETCH_PLANNING_SLEEP_DURATION_MS = 1000; + // Maximum time to wait for scan planning to complete (5 minutes) + // This prevents indefinite blocking on server-side planning issues + private static final long MAX_WAIT_TIME_MS = 5 * 60 * 1000L; + + RESTTableScan( + Table table, + Schema schema, + TableScanContext context, + RESTClient client, + String path, + Supplier<Map<String, String>> headers, + TableOperations operations, + TableIdentifier tableIdentifier, + ResourcePaths resourcePaths, + Set<Endpoint> supportedEndpoints) { + super(table, schema, context); + this.table = table; + this.client = client; + this.headers = headers; + this.path = path; + this.operations = operations; + this.tableIdentifier = tableIdentifier; + this.resourcePaths = resourcePaths; + this.supportedEndpoints = supportedEndpoints; + this.parserContext = + ParserContext.builder() + .add("specsById", table.specs()) + .add("caseSensitive", context().caseSensitive()) + .build(); + } + + @Override + protected TableScan newRefinedScan( + Table refinedTable, Schema refinedSchema, TableScanContext refinedContext) { + return new RESTTableScan( + refinedTable, + refinedSchema, + refinedContext, + client, + path, + headers, + operations, + tableIdentifier, + resourcePaths, + supportedEndpoints); + } + + @Override + public CloseableIterable<FileScanTask> planFiles() { + Long startSnapshotId = context().fromSnapshotId(); + Long endSnapshotId = context().toSnapshotId(); + Long snapshotId = snapshotId(); + List<String> selectedColumns = + schema().columns().stream().map(Types.NestedField::name).collect(Collectors.toList()); + + List<String> statsFields = null; + if (columnsToKeepStats() != null) { + statsFields = + columnsToKeepStats().stream() + .map(columnId -> schema().findColumnName(columnId)) + .collect(Collectors.toList()); + } + + PlanTableScanRequest.Builder planTableScanRequestBuilder = + PlanTableScanRequest.builder() + .withSelect(selectedColumns) + .withFilter(filter()) + .withCaseSensitive(isCaseSensitive()) + .withStatsFields(statsFields); + + if (startSnapshotId != null && endSnapshotId != null) { + planTableScanRequestBuilder + .withStartSnapshotId(startSnapshotId) + .withEndSnapshotId(endSnapshotId) + .withUseSnapshotSchema(true); + + } else if (snapshotId != null) { + boolean useSnapShotSchema = snapshotId != table.currentSnapshot().snapshotId(); + planTableScanRequestBuilder + .withSnapshotId(snapshotId) + .withUseSnapshotSchema(useSnapShotSchema); + } + + return planTableScan(planTableScanRequestBuilder.build()); + } + + private CloseableIterable<FileScanTask> planTableScan(PlanTableScanRequest planTableScanRequest) { + + PlanTableScanResponse response = + client.post( + resourcePaths.planTableScan(tableIdentifier), + planTableScanRequest, + PlanTableScanResponse.class, + headers.get(), + ErrorHandlers.defaultErrorHandler(), + stringStringMap -> {}, + parserContext); + + PlanStatus planStatus = response.planStatus(); + switch (planStatus) { + case COMPLETED: + currentPlanId = response.planId(); + return getScanTasksIterable(response.planTasks(), response.fileScanTasks()); + case SUBMITTED: + Preconditions.checkState( + supportedEndpoints.contains(Endpoint.V1_FETCH_TABLE_SCAN_PLAN), + "The endpoint to fetch table scan plans is not supported by the server."); + return fetchPlanningResult(response.planId()); + case FAILED: + throw new IllegalStateException( + "Received \"failed\" status from service when planning a table scan"); + case CANCELLED: + throw new IllegalStateException( + "Received \"cancelled\" status from service when planning a table scan"); + default: + throw new RuntimeException( + String.format("Invalid planStatus during planTableScan: %s", planStatus)); + } + } + + private CloseableIterable<FileScanTask> fetchPlanningResult(String planId) { + // Set the current plan ID for potential cancellation + currentPlanId = planId; + + try { + long startTime = System.currentTimeMillis(); + while (System.currentTimeMillis() - startTime <= MAX_WAIT_TIME_MS) { + FetchPlanningResultResponse response = + client.get( + resourcePaths.plan(tableIdentifier, planId), + Map.of(), + FetchPlanningResultResponse.class, + headers.get(), + ErrorHandlers.defaultErrorHandler(), + parserContext); + + PlanStatus planStatus = response.planStatus(); + switch (planStatus) { + case COMPLETED: + return getScanTasksIterable(response.planTasks(), response.fileScanTasks()); + case SUBMITTED: + try { + // TODO: if we want to add some jitter here to avoid thundering herd. + Thread.sleep(FETCH_PLANNING_SLEEP_DURATION_MS); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + // Attempt to cancel the plan before exiting + cancelPlan(); + throw new RuntimeException("Interrupted while fetching plan status", e); + } + break; + case FAILED: + throw new IllegalStateException( + "Received \"failed\" status from service when fetching a table scan"); + case CANCELLED: + throw new IllegalStateException( + String.format( + Locale.ROOT, + "Received \"cancelled\" status from service when fetching a table scan, planId: %s is invalid", + planId)); + default: + throw new IllegalStateException( + String.format( + Locale.ROOT, "Invalid planStatus during fetchPlanningResult: %s", planStatus)); + } + } + // If we reach here, we've exceeded the max wait time + // Attempt to cancel the plan before timing out + cancelPlan(); + throw new IllegalStateException( + String.format( + Locale.ROOT, + "Exceeded max wait time of %d ms when fetching planning result for planId: %s", + MAX_WAIT_TIME_MS, + planId)); + } catch (Exception e) { + // Clear the plan ID on any exception (except successful completion) + // Also attempt to cancel the plan to clean up server resources + try { + cancelPlan(); + } catch (Exception cancelException) { + // Ignore cancellation failures during exception handling + // The original exception is more important + } + throw e; + } + } + + private CloseableIterable<FileScanTask> getScanTasksIterable( Review Comment: nit: `get` prefix is used -- This is an automated message from the Apache Git Service. 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