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href=/documentation/io/built-in/sparkreceiver/>Spark Receiver I/O connector</a></li><li><a href=/documentation/io/built-in/singlestore/>SingleStoreDB I/O connector</a></li><li><a href=/documentation/io/built-in/webapis/>Web APIs I/O connector</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Developing new I/O connectors</span><ul class=section-nav-list><li><a href=/documentation/io/developing-io-overview/>Overview: Developing connectors</a></li><li><a href=/documentation/io/developing-io-java/>Developing connectors (Java)</a></li><li><a href=/documentation/io/developing-io-python/>Developing connectors (Python)</a></li><li><a href=/documentation/io/io-standards/>I/O Standards</a></li></ul></li><li><a href=/documentation/io/testing/>Testing I/O transforms</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Schemas</span><ul class=section-nav-list><li><a 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CoderRegistry</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Windowing</span><ul class=section-nav-list><li><a href=/documentation/programming-guide/#windowing>Windowing basics</a></li><li><a href=/documentation/programming-guide/#provided-windowing-functions>Provided windowing functions</a></li><li><a href=/documentation/programming-guide/#setting-your-pcollections-windowing-function>Setting your PCollection’s windowing function</a></li><li><a href=/documentation/programming-guide/#watermarks-and-late-data>Watermarks and late data</a></li><li><a href=/documentation/programming-guide/#adding-timestamps-to-a-pcollections-elements>Adding timestamps to a PCollection’s elements</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Triggers</span><ul class=section-nav-list><li><a href=/documentation/programming-guide/#triggers>Trigger basics</a></li><li><a href=/documentation/programming-guide/#event-time-triggers>Event time triggers and the default trigger</a></li><li><a href=/documentation/programming-guide/#processing-time-triggers>Processing time triggers</a></li><li><a href=/documentation/programming-guide/#data-driven-triggers>Data-driven triggers</a></li><li><a href=/documentation/programming-guide/#setting-a-trigger>Setting a trigger</a></li><li><a href=/documentation/programming-guide/#composite-triggers>Composite triggers</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Metrics</span><ul class=section-nav-list><li><a href=/documentation/programming-guide/#metrics>Metrics basics</a></li><li><a href=/documentation/programming-guide/#types-of-metrics>Types of metrics</a></li><li><a href=/documentation/programming-guide/#querying-metrics>Querying metrics</a></li><li><a href=/documentation/programming-guide/#using-metrics>Using metrics in pipeline</a></li><li><a href=/documentation/programming-guide/#export-metrics>Export metrics</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>State and Timers</span><ul class=section-nav-list><li><a href=/documentation/programming-guide/#types-of-state>Types of state</a></li><li><a href=/documentation/programming-guide/#deferred-state-reads>Deferred state reads</a></li><li><a href=/documentation/programming-guide/#timers>Timers</a></li><li><a href=/documentation/programming-guide/#garbage-collecting-state>Garbage collecting state</a></li><li><a href=/documentation/programming-guide/#state-timers-examples>State and timers examples</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Splittable DoFns</span><ul class=section-nav-list><li><a href=/documentation/programming-guide/#sdf-basics>Basics</a></li><li><a href=/documentation/programming-guide/#sizing-and-progress>Sizing and progress</a></li><li><a href=/documentation/programming-guide/#user-initiated-checkpoint>User-initiated checkpoint</a></li><li><a href=/documentation/programming-guide/#runner-initiated-split>Runner initiated split</a></li><li><a href=/documentation/programming-guide/#watermark-estimation>Watermark estimation</a></li><li><a href=/documentation/programming-guide/#truncating-during-drain>Truncating during drain</a></li><li><a href=/documentation/programming-guide/#bundle-finalization>Bundle finalization</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Multi-language Pipelines</span><ul class=section-nav-list><li><a href=/documentation/programming-guide/#create-x-lang-transforms>Creating cross-language transforms</a></li><li><a href=/documentation/programming-guide/#use-x-lang-transforms>Using cross-language transforms</a></li><li><a href=/documentation/programming-guide/#x-lang-transform-runner-support>Runner Support</a></li></ul></li><li><a href=/documentation/programming-guide/#batched-dofns>Batched DoFns</a></li><li><a href=/documentation/programming-guide/#transform-service>Transform service</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Pipeline development lifecycle</span><ul class=section-nav-list><li><a href=/documentation/pipelines/design-your-pipeline/>Design Your Pipeline</a></li><li><a href=/documentation/pipelines/create-your-pipeline/>Create Your Pipeline</a></li><li><a href=/documentation/pipelines/test-your-pipeline/>Test Your Pipeline</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Common pipeline patterns</span><ul class=section-nav-list><li><a href=/documentation/patterns/overview/>Overview</a></li><li><a href=/documentation/patterns/file-processing/>File processing</a></li><li><a href=/documentation/patterns/side-inputs/>Side inputs</a></li><li><a href=/documentation/patterns/pipeline-options/>Pipeline options</a></li><li><a href=/documentation/patterns/custom-io/>Custom I/O</a></li><li><a href=/documentation/patterns/custom-windows/>Custom windows</a></li><li><a href=/documentation/patterns/bigqueryio/>BigQueryIO</a></li><li><a href=/documentation/patterns/ai-platform/>AI Platform</a></li><li><a href=/documentation/patterns/schema/>Schema</a></li><li><a href=/documentation/patterns/bqml/>BigQuery ML</a></li><li><a href=/documentation/patterns/grouping-elements-for-efficient-external-service-calls/>Grouping elements for efficient external service calls</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>AI/ML pipelines</span><ul class=section-nav-list><li><a href=/documentation/ml/overview/>Get started with AI/ML</a></li><li><a href=/documentation/ml/about-ml/>About Beam ML</a></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Prediction and inference</span><ul class=section-nav-list><li><a href=/documentation/ml/inference-overview/>Overview</a></li><li><a href=/documentation/ml/multi-model-pipelines/>Build a pipeline with multiple models</a></li><li><a href=/documentation/ml/tensorrt-runinference>Build a custom model handler with TensorRT</a></li><li><a href=/documentation/ml/large-language-modeling>Use LLM inference</a></li><li><a href=/documentation/ml/multi-language-inference/>Build a multi-language inference pipeline</a></li><li><a href=/documentation/ml/side-input-updates/>Update your model in production</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Data processing</span><ul class=section-nav-list><li><a href=/documentation/ml/preprocess-data/>Preprocess data</a></li><li><a href=/documentation/ml/data-processing/>Explore your data</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Workflow orchestration</span><ul class=section-nav-list><li><a href=/documentation/ml/orchestration/>Use ML-OPS workflow orchestrators</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Model training</span><ul class=section-nav-list><li><a href=/documentation/ml/per-entity-training>Per-entity training</a></li><li><a href=/documentation/ml/online-clustering/>Online clustering</a></li><li><a href=/documentation/ml/model-evaluation/>ML model evaluation</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Use cases</span><ul class=section-nav-list><li><a href=/documentation/ml/anomaly-detection/>Build an anomaly detection pipeline</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Reference</span><ul class=section-nav-list><li><a href=/documentation/ml/runinference-metrics/>RunInference metrics</a></li><li><a href=/documentation/ml/model-evaluation/>Model validation</a></li></ul></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Runtime systems</span><ul class=section-nav-list><li><a href=/documentation/runtime/environments/>Container environments</a></li><li><a href=/documentation/runtime/resource-hints/>Resource hints</a></li><li><a href=/documentation/runtime/sdk-harness-config/>SDK Harness Configuration</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Transform catalog</span><ul class=section-nav-list><li class=section-nav-item--collapsible><span class=section-nav-list-title>Python</span><ul class=section-nav-list><li><a href=/documentation/transforms/python/overview/>Overview</a></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Element-wise</span><ul class=section-nav-list><li class=section-nav-item--collapsible><span class=section-nav-list-title>Enrichment</span><ul class=section-nav-list><li><a href=/documentation/transforms/python/elementwise/enrichment/>Overview</a></li><li><a href=/documentation/transforms/python/elementwise/enrichment-bigtable/>Bigtable example</a></li><li><a href=/documentation/transforms/python/elementwise/enrichment-vertexai/>Vertex AI Feature Store examples</a></li></ul></li><li><a href=/documentation/transforms/python/elementwise/filter/>Filter</a></li><li><a href=/documentation/transforms/python/elementwise/flatmap/>FlatMap</a></li><li><a href=/documentation/transforms/python/elementwise/keys/>Keys</a></li><li><a href=/documentation/transforms/python/elementwise/kvswap/>KvSwap</a></li><li><a href=/documentation/transforms/python/elementwise/map/>Map</a></li><li><a href=/documentation/transforms/python/elementwise/mltransform/>MLTransform</a></li><li><a href=/documentation/transforms/python/elementwise/pardo/>ParDo</a></li><li><a href=/documentation/transforms/python/elementwise/partition/>Partition</a></li><li><a href=/documentation/transforms/python/elementwise/regex/>Regex</a></li><li><a href=/documentation/transforms/python/elementwise/reify/>Reify</a></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>RunInference</span><ul class=section-nav-list><li><a href=/documentation/transforms/python/elementwise/runinference/>Overview</a></li><li><a href=/documentation/transforms/python/elementwise/runinference-pytorch/>PyTorch examples</a></li><li><a href=/documentation/transforms/python/elementwise/runinference-sklearn/>Sklearn examples</a></li></ul></li><li><a href=/documentation/transforms/python/elementwise/tostring/>ToString</a></li><li><a href=/documentation/transforms/python/elementwise/values/>Values</a></li><li><a href=/documentation/transforms/python/elementwise/withtimestamps/>WithTimestamps</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Aggregation</span><ul class=section-nav-list><li><a href=/documentation/transforms/python/aggregation/approximatequantiles/>ApproximateQuantiles</a></li><li><a href=/documentation/transforms/python/aggregation/approximateunique/>ApproximateUnique</a></li><li><a href=/documentation/transforms/python/aggregation/cogroupbykey/>CoGroupByKey</a></li><li><a href=/documentation/transforms/python/aggregation/combineglobally/>CombineGlobally</a></li><li><a href=/documentation/transforms/python/aggregation/combineperkey/>CombinePerKey</a></li><li><a href=/documentation/transforms/python/aggregation/combinevalues/>CombineValues</a></li><li><a href=/documentation/transforms/python/aggregation/count/>Count</a></li><li><a href=/documentation/transforms/python/aggregation/distinct/>Distinct</a></li><li><a href=/documentation/transforms/python/aggregation/groupby/>GroupBy</a></li><li><a href=/documentation/transforms/python/aggregation/groupbykey/>GroupByKey</a></li><li><a href=/documentation/transforms/python/aggregation/groupintobatches/>GroupIntoBatches</a></li><li><a href=/documentation/transforms/python/aggregation/latest/>Latest</a></li><li><a href=/documentation/transforms/python/aggregation/max/>Max</a></li><li><a href=/documentation/transforms/python/aggregation/mean/>Mean</a></li><li><a href=/documentation/transforms/python/aggregation/min/>Min</a></li><li><a href=/documentation/transforms/python/aggregation/sample/>Sample</a></li><li><a href=/documentation/transforms/python/aggregation/sum/>Sum</a></li><li><a href=/documentation/transforms/python/aggregation/top/>Top</a></li><li><a href=/documentation/transforms/python/aggregation/tolist/>ToList</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Other</span><ul class=section-nav-list><li><a href=/documentation/transforms/python/other/create/>Create</a></li><li><a href=/documentation/transforms/python/other/flatten/>Flatten</a></li><li><a href=/documentation/transforms/python/other/reshuffle/>Reshuffle</a></li><li><a href=/documentation/transforms/python/other/windowinto/>WindowInto</a></li></ul></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Java</span><ul class=section-nav-list><li><a href=/documentation/transforms/java/overview/>Overview</a></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Element-wise</span><ul class=section-nav-list><li><a href=/documentation/transforms/java/elementwise/filter/>Filter</a></li><li><a href=/documentation/transforms/java/elementwise/flatmapelements/>FlatMapElements</a></li><li><a href=/documentation/transforms/java/elementwise/keys/>Keys</a></li><li><a href=/documentation/transforms/java/elementwise/kvswap/>KvSwap</a></li><li><a href=/documentation/transforms/java/elementwise/mapelements/>MapElements</a></li><li><a href=/documentation/transforms/java/elementwise/pardo/>ParDo</a></li><li><a href=/documentation/transforms/java/elementwise/partition/>Partition</a></li><li><a href=/documentation/transforms/java/elementwise/regex/>Regex</a></li><li><a href=/documentation/transforms/java/elementwise/reify/>Reify</a></li><li><a href=/documentation/transforms/java/elementwise/tostring/>ToString</a></li><li><a href=/documentation/transforms/java/elementwise/values/>Values</a></li><li><a href=/documentation/transforms/java/elementwise/withkeys/>WithKeys</a></li><li><a href=/documentation/transforms/java/elementwise/withtimestamps/>WithTimestamps</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Aggregation</span><ul class=section-nav-list><li><a href=/documentation/transforms/java/aggregation/approximatequantiles/>ApproximateQuantiles</a></li><li><a href=/documentation/transforms/java/aggregation/approximateunique/>ApproximateUnique</a></li><li><a href=/documentation/transforms/java/aggregation/cogroupbykey/>CoGroupByKey</a></li><li><a href=/documentation/transforms/java/aggregation/combine/>Combine</a></li><li><a href=/documentation/transforms/java/aggregation/combinewithcontext/>CombineWithContext</a></li><li><a href=/documentation/transforms/java/aggregation/count/>Count</a></li><li><a href=/documentation/transforms/java/aggregation/distinct/>Distinct</a></li><li><a href=/documentation/transforms/java/aggregation/groupbykey/>GroupByKey</a></li><li><a href=/documentation/transforms/java/aggregation/groupintobatches/>GroupIntoBatches</a></li><li><a href=/documentation/transforms/java/aggregation/hllcount/>HllCount</a></li><li><a href=/documentation/transforms/java/aggregation/latest/>Latest</a></li><li><a href=/documentation/transforms/java/aggregation/max/>Max</a></li><li><a href=/documentation/transforms/java/aggregation/mean/>Mean</a></li><li><a href=/documentation/transforms/java/aggregation/min/>Min</a></li><li><a href=/documentation/transforms/java/aggregation/sample/>Sample</a></li><li><a href=/documentation/transforms/java/aggregation/sum/>Sum</a></li><li><a href=/documentation/transforms/java/aggregation/top/>Top</a></li></ul></li><li class=section-nav-item--collapsible><span class=section-nav-list-title>Other</span><ul class=section-nav-list><li><a href=/documentation/transforms/java/other/create/>Create</a></li><li><a href=/documentation/transforms/java/other/flatten/>Flatten</a></li><li><a href=/documentation/transforms/java/other/passert/>PAssert</a></li><li><a href=/documentation/transforms/java/other/view/>View</a></li><li><a href=/documentation/transforms/java/other/window/>Window</a></li></ul></li></ul></li></ul></li><li><a href=/documentation/glossary/>Glossary</a></li><li><a href=https://cwiki.apache.org/confluence/display/BEAM/Apache+Beam>Beam Wiki <img src=/images/external-link-icon.png width=14 height=14 alt="External link."></a></li></ul></nav></div><nav class="page-nav clearfix" data-offset-top=90 data-offset-bottom=500><nav id=TableOfContents><ul><li><a href=#processing-files-as-they-arrive>Processing files as they arrive</a><ul><li><a href=#continuous-read-mode>Continuous read mode</a></li><li><a href=#stream-processing-triggered-from-external-source>Stream processing triggered from external source</a></li><li><a href=#batch-processing-triggered-from-external-source>Batch processing triggered from external source</a></li></ul></li><li><a href=#accessing-filenames>Accessing filenames</a></li></ul></nav></nav><div class="body__contained body__section-nav arrow-list arrow-list--no-mt"><h1 id=file-processing-patterns>File processing patterns</h1><p>This page describes common file processing tasks. For more information on file-based I/O, see <a href=/documentation/programming-guide/#pipeline-io>Pipeline I/O</a> and <a href=/documentation/programming-guide/#file-based-data>File-based input and output data</a>.</p><nav class=language-switcher><strong>Adapt for:</strong><ul><li data-value=java class=active>Java SDK</li><li data-value=py>Python SDK</li></ul></nav><h2 id=processing-files-as-they-arrive>Processing files as they arrive</h2><p>This section shows you how to process files as they arrive in your file system or object store (like Google Cloud Storage). You can continuously read files or trigger stream and processing pipelines when a file arrives.</p><h3 id=continuous-read-mode>Continuous read mode</h3><p class=language-java>You can use <code>FileIO</code> or <code>TextIO</code> to continuously read the source for new files.</p><p class=language-java>Use the <a href=https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/io/FileIO.html><code>FileIO</code></a> class to continuously watch a single file pattern. The following example matches a file pattern repeatedly every 30 seconds, continuously returns new matched files as an unbounded <code>PCollection<Metadata></code>, and stops if no new files appear for one hour:</p><div class='language-java snippet'><div class="notebook-skip code-snippet"><a class=copy type=button data-bs-toggle=tooltip data-bs-placement=bottom title="Copy to clipboard"><img src=/images/copy-icon.svg></a><div class=highlight><pre tabindex=0 class=chroma><code class=language-java data-lang=java><span class=line><span class=cl><span class=c1>// This produces PCollection<MatchResult.Metadata> |
| </span></span></span><span class=line><span class=cl><span class=c1></span><span class=n>p</span><span class=o>.</span><span class=na>apply</span><span class=o>(</span> |
| </span></span><span class=line><span class=cl> <span class=n>FileIO</span><span class=o>.</span><span class=na>match</span><span class=o>()</span> |
| </span></span><span class=line><span class=cl> <span class=o>.</span><span class=na>filepattern</span><span class=o>(</span><span class=s>"..."</span><span class=o>)</span> |
| </span></span><span class=line><span class=cl> <span class=o>.</span><span class=na>continuously</span><span class=o>(</span> |
| </span></span><span class=line><span class=cl> <span class=n>Duration</span><span class=o>.</span><span class=na>standardSeconds</span><span class=o>(</span><span class=n>30</span><span class=o>),</span> |
| </span></span><span class=line><span class=cl> <span class=n>Watch</span><span class=o>.</span><span class=na>Growth</span><span class=o>.</span><span class=na>afterTimeSinceNewOutput</span><span class=o>(</span><span class=n>Duration</span><span class=o>.</span><span class=na>standardHours</span><span class=o>(</span><span class=n>1</span><span class=o>))));</span></span></span></code></pre></div></div></div><p class=language-java>The <a href=https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/io/TextIO.html><code>TextIO</code></a> class <code>watchForNewFiles</code> property streams new file matches.</p><div class='language-java snippet'><div class="notebook-skip code-snippet"><a class=copy type=button data-bs-toggle=tooltip data-bs-placement=bottom title="Copy to clipboard"><img src=/images/copy-icon.svg></a><div class=highlight><pre tabindex=0 class=chroma><code class=language-java data-lang=java><span class=line><span class=cl><span class=c1>// This produces PCollection<String> |
| </span></span></span><span class=line><span class=cl><span class=c1></span><span class=n>p</span><span class=o>.</span><span class=na>apply</span><span class=o>(</span> |
| </span></span><span class=line><span class=cl> <span class=n>TextIO</span><span class=o>.</span><span class=na>read</span><span class=o>()</span> |
| </span></span><span class=line><span class=cl> <span class=o>.</span><span class=na>from</span><span class=o>(</span><span class=s>"<path-to-files>/*"</span><span class=o>)</span> |
| </span></span><span class=line><span class=cl> <span class=o>.</span><span class=na>watchForNewFiles</span><span class=o>(</span> |
| </span></span><span class=line><span class=cl> <span class=c1>// Check for new files every minute. |
| </span></span></span><span class=line><span class=cl><span class=c1></span> <span class=n>Duration</span><span class=o>.</span><span class=na>standardMinutes</span><span class=o>(</span><span class=n>1</span><span class=o>),</span> |
| </span></span><span class=line><span class=cl> <span class=c1>// Stop watching the file pattern if no new files appear for an hour. |
| </span></span></span><span class=line><span class=cl><span class=c1></span> <span class=n>Watch</span><span class=o>.</span><span class=na>Growth</span><span class=o>.</span><span class=na>afterTimeSinceNewOutput</span><span class=o>(</span><span class=n>Duration</span><span class=o>.</span><span class=na>standardHours</span><span class=o>(</span><span class=n>1</span><span class=o>))));</span></span></span></code></pre></div></div></div><p class=language-java>Some runners may retain file lists during updates, but file lists don’t persist when you restart a pipeline. You can save file lists by:</p><p class=language-java><ul><li>Storing processed filenames in an external file and deduplicating the lists at the next transform</li><li>Adding timestamps to filenames, writing a glob pattern to pull in only new files, and matching the pattern when the pipeline restarts</li></ul></p><p class=language-py>The continuous-read option is not available for Python.</p><h3 id=stream-processing-triggered-from-external-source>Stream processing triggered from external source</h3><p>A streaming pipeline can process data from an unbounded source. For example, to trigger stream processing with Google Cloud Pub/Sub:</p><ol><li>Use an external process to detect when new files arrive.</li><li>Send a Google Cloud Pub/Sub message with a URI to the file.</li><li>Access the URI from a <code>DoFn</code> that follows the Google Cloud Pub/Sub source.</li><li>Process the file.</li></ol><h3 id=batch-processing-triggered-from-external-source>Batch processing triggered from external source</h3><p>To start or schedule a batch pipeline job when a file arrives, write the triggering event in the source file itself. This has the most latency because the pipeline must initialize before processing. It’s best suited for low-frequency, large, file-size updates.</p><h2 id=accessing-filenames>Accessing filenames</h2><p class=language-java>Use the <code>FileIO</code> class to read filenames in a pipeline job. <code>FileIO</code> returns a <code>PCollection<ReadableFile></code> object, and the <code>ReadableFile</code> instance contains the filename.</p><p class=language-java>To access filenames:</p><p class=language-java><ol><li>Create a <code>ReadableFile</code> instance with <code>FileIO</code>. <code>FileIO</code> returns a <code>PCollection<ReadableFile></code> object. The <code>ReadableFile</code> class contains the filename.</li><li>Call the <code>readFullyAsUTF8String()</code> method to read the file into memory and return the filename as a <code>String</code> object. If memory is limited, you can use utility classes like <a href=https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/io/FileSystems.html><code>FileSystems</code></a> to work directly with the file.</li></ol></p><p class=language-py>To read filenames in a pipeline job:</p><p class=language-py><ol><li>Collect the list of file URIs. You can use the <a href="https://beam.apache.org/releases/pydoc/current/apache_beam.io.filesystems.html?highlight=filesystems#module-apache_beam.io.filesystems"><code>FileSystems</code></a> module to get a list of files that match a glob pattern.</li><li>Pass the file URIs to a <code>PCollection</code>.</li></ol></p><div class='language-java snippet'><div class="notebook-skip code-snippet"><a class=copy type=button data-bs-toggle=tooltip data-bs-placement=bottom title="Copy to clipboard"><img src=/images/copy-icon.svg></a><div class=highlight><pre tabindex=0 class=chroma><code class=language-java data-lang=java><span class=line><span class=cl><span class=n>p</span><span class=o>.</span><span class=na>apply</span><span class=o>(</span><span class=n>FileIO</span><span class=o>.</span><span class=na>match</span><span class=o>().</span><span class=na>filepattern</span><span class=o>(</span><span class=s>"hdfs://path/to/*.gz"</span><span class=o>))</span> |
| </span></span><span class=line><span class=cl> <span class=c1>// The withCompression method is optional. By default, the Beam SDK detects compression from |
| </span></span></span><span class=line><span class=cl><span class=c1></span> <span class=c1>// the filename. |
| </span></span></span><span class=line><span class=cl><span class=c1></span> <span class=o>.</span><span class=na>apply</span><span class=o>(</span><span class=n>FileIO</span><span class=o>.</span><span class=na>readMatches</span><span class=o>().</span><span class=na>withCompression</span><span class=o>(</span><span class=n>Compression</span><span class=o>.</span><span class=na>GZIP</span><span class=o>))</span> |
| </span></span><span class=line><span class=cl> <span class=o>.</span><span class=na>apply</span><span class=o>(</span> |
| </span></span><span class=line><span class=cl> <span class=n>ParDo</span><span class=o>.</span><span class=na>of</span><span class=o>(</span> |
| </span></span><span class=line><span class=cl> <span class=k>new</span> <span class=n>DoFn</span><span class=o><</span><span class=n>FileIO</span><span class=o>.</span><span class=na>ReadableFile</span><span class=o>,</span> <span class=n>String</span><span class=o>>()</span> <span class=o>{</span> |
| </span></span><span class=line><span class=cl> <span class=nd>@ProcessElement</span> |
| </span></span><span class=line><span class=cl> <span class=kd>public</span> <span class=kt>void</span> <span class=nf>process</span><span class=o>(</span><span class=nd>@Element</span> <span class=n>FileIO</span><span class=o>.</span><span class=na>ReadableFile</span> <span class=n>file</span><span class=o>)</span> <span class=o>{</span> |
| </span></span><span class=line><span class=cl> <span class=c1>// We can now access the file and its metadata. |
| </span></span></span><span class=line><span class=cl><span class=c1></span> <span class=n>LOG</span><span class=o>.</span><span class=na>info</span><span class=o>(</span><span class=s>"File Metadata resourceId is {} "</span><span class=o>,</span> <span class=n>file</span><span class=o>.</span><span class=na>getMetadata</span><span class=o>().</span><span class=na>resourceId</span><span class=o>());</span> |
| </span></span><span class=line><span class=cl> <span class=o>}</span> |
| </span></span><span class=line><span class=cl> <span class=o>}));</span></span></span></code></pre></div></div></div><div class='language-py snippet'><div class="notebook-skip code-snippet"><a class=copy type=button data-bs-toggle=tooltip data-bs-placement=bottom title="Copy to clipboard"><img src=/images/copy-icon.svg></a><div class=highlight><pre tabindex=0 class=chroma><code class=language-py data-lang=py><span class=line><span class=cl><span class=k>with</span> <span class=n>beam</span><span class=o>.</span><span class=n>Pipeline</span><span class=p>()</span> <span class=k>as</span> <span class=n>pipeline</span><span class=p>:</span> |
| </span></span><span class=line><span class=cl> <span class=n>readable_files</span> <span class=o>=</span> <span class=p>(</span> |
| </span></span><span class=line><span class=cl> <span class=n>pipeline</span> |
| </span></span><span class=line><span class=cl> <span class=o>|</span> <span class=n>fileio</span><span class=o>.</span><span class=n>MatchFiles</span><span class=p>(</span><span class=s1>'hdfs://path/to/*.txt'</span><span class=p>)</span> |
| </span></span><span class=line><span class=cl> <span class=o>|</span> <span class=n>fileio</span><span class=o>.</span><span class=n>ReadMatches</span><span class=p>()</span> |
| </span></span><span class=line><span class=cl> <span class=o>|</span> <span class=n>beam</span><span class=o>.</span><span class=n>Reshuffle</span><span class=p>())</span> |
| </span></span><span class=line><span class=cl> <span class=n>files_and_contents</span> <span class=o>=</span> <span class=p>(</span> |
| </span></span><span class=line><span class=cl> <span class=n>readable_files</span> |
| </span></span><span class=line><span class=cl> <span class=o>|</span> <span class=n>beam</span><span class=o>.</span><span class=n>Map</span><span class=p>(</span><span class=k>lambda</span> <span class=n>x</span><span class=p>:</span> <span class=p>(</span><span class=n>x</span><span class=o>.</span><span class=n>metadata</span><span class=o>.</span><span class=n>path</span><span class=p>,</span> <span class=n>x</span><span class=o>.</span><span class=n>read_utf8</span><span class=p>())))</span></span></span></code></pre></div></div></div><div class=feedback><p class=update>Last updated on 2024/04/18</p><h3>Have you found everything you were looking for?</h3><p class=description>Was it all useful and clear? Is there anything that you would like to change? Let us know!</p><button class=load-button><a href="https://docs.google.com/forms/d/e/1FAIpQLSfID7abne3GE6k6RdJIyZhPz2Gef7UkpggUEhTIDjjplHuxSA/viewform?usp=header_link" target=_blank>SEND FEEDBACK</a></button></div></div></div><footer class=footer><div class=footer__contained><div class=footer__cols><div class="footer__cols__col footer__cols__col__logos"><div class=footer__cols__col__logo><img src=/images/beam_logo_circle.svg class=footer__logo alt="Beam logo"></div><div class=footer__cols__col__logo><img src=/images/apache_logo_circle.svg class=footer__logo alt="Apache logo"></div></div><div class=footer-wrapper><div class=wrapper-grid><div class=footer__cols__col><div class=footer__cols__col__title>Start</div><div class=footer__cols__col__link><a href=/get-started/beam-overview/>Overview</a></div><div class=footer__cols__col__link><a href=/get-started/quickstart-java/>Quickstart (Java)</a></div><div class=footer__cols__col__link><a href=/get-started/quickstart-py/>Quickstart (Python)</a></div><div class=footer__cols__col__link><a href=/get-started/quickstart-go/>Quickstart (Go)</a></div><div class=footer__cols__col__link><a href=/get-started/downloads/>Downloads</a></div></div><div class=footer__cols__col><div class=footer__cols__col__title>Docs</div><div class=footer__cols__col__link><a href=/documentation/programming-guide/>Concepts</a></div><div class=footer__cols__col__link><a href=/documentation/pipelines/design-your-pipeline/>Pipelines</a></div><div class=footer__cols__col__link><a href=/documentation/runners/capability-matrix/>Runners</a></div></div><div class=footer__cols__col><div class=footer__cols__col__title>Community</div><div class=footer__cols__col__link><a href=/contribute/>Contribute</a></div><div class=footer__cols__col__link><a href=https://projects.apache.org/committee.html?beam target=_blank>Team<img src=/images/external-link-icon.png width=14 height=14 alt="External link."></a></div><div class=footer__cols__col__link><a href=/community/presentation-materials/>Media</a></div><div class=footer__cols__col__link><a href=/community/in-person/>Events/Meetups</a></div><div class=footer__cols__col__link><a href=/community/contact-us/>Contact Us</a></div></div><div class=footer__cols__col><div class=footer__cols__col__title>Resources</div><div class=footer__cols__col__link><a href=/blog/>Blog</a></div><div class=footer__cols__col__link><a href=https://github.com/apache/beam>GitHub</a></div></div></div><div class=footer__bottom>© |
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