Report Beam Lineage from Parquet reads #5850
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| /* | ||
| * Copyright 2026 Spotify AB. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
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| package com.spotify.scio.parquet | ||
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| import org.apache.beam.sdk.io.FileSystems | ||
| import org.apache.beam.sdk.transforms.DoFn | ||
| import org.apache.beam.sdk.transforms.DoFn.{ProcessElement, Setup} | ||
| import org.slf4j.LoggerFactory | ||
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| /** | ||
| * DoFn that reports directory-level source lineage for legacy Parquet reads. | ||
| * | ||
| * @param filePattern | ||
| * The file pattern or path to report lineage for | ||
| */ | ||
| private[parquet] class LineageReportingDoFn[T](filePattern: String) extends DoFn[T, T] { | ||
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| @transient | ||
| private lazy val logger = LoggerFactory.getLogger(classOf[LineageReportingDoFn[T]]) | ||
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| @Setup | ||
| def setup(): Unit = { | ||
| try { | ||
| val isDirectory = filePattern.endsWith("/") | ||
| val resourceId = FileSystems.matchNewResource(filePattern, isDirectory) | ||
| val directory = resourceId.getCurrentDirectory | ||
| FileSystems.reportSourceLineage(directory) | ||
| } catch { | ||
| case e: Exception => | ||
| logger.warn( | ||
| s"Error when reporting lineage for pattern: $filePattern", | ||
| e | ||
| ) | ||
| } | ||
| } | ||
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| @ProcessElement | ||
| def processElement(@DoFn.Element element: T, out: DoFn.OutputReceiver[T]): Unit = | ||
| out.output(element) | ||
| } |
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This is different than the hadoop one insofar as we get every file here, right? That seems bad/annoying for using the lineage for anything
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Actually file-level lineage is the default approach in Beam. Which we might not need directly. Both Lineage Metric implementations (legacy and new one) work ok with many files:
StringSet has internal truncation to 100
BoundedTrie is a data structure that stores hierarchical data very well