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https://issues.apache.org/jira/browse/BEAM-214?focusedWorklogId=104569&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-104569
]
ASF GitHub Bot logged work on BEAM-214:
---------------------------------------
Author: ASF GitHub Bot
Created on: 22/May/18 09:53
Start Date: 22/May/18 09:53
Worklog Time Spent: 10m
Work Description: lgajowy commented on a change in pull request #5242:
[BEAM-214] ParquetIO
URL: https://github.com/apache/beam/pull/5242#discussion_r189841791
##########
File path:
sdks/java/io/parquet/src/main/java/org/apache/beam/sdk/io/parquet/ParquetIO.java
##########
@@ -0,0 +1,352 @@
+/*
+ * 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.beam.sdk.io.parquet;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.apache.parquet.hadoop.ParquetFileWriter.Mode.OVERWRITE;
+
+import com.google.auto.value.AutoValue;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.channels.Channels;
+import java.nio.channels.SeekableByteChannel;
+import java.nio.channels.WritableByteChannel;
+import javax.annotation.Nullable;
+import org.apache.avro.Schema;
+import org.apache.avro.generic.GenericRecord;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.StringUtf8Coder;
+import org.apache.beam.sdk.io.FileIO;
+import org.apache.beam.sdk.options.ValueProvider;
+import org.apache.beam.sdk.transforms.Create;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.parquet.avro.AvroParquetReader;
+import org.apache.parquet.avro.AvroParquetWriter;
+import org.apache.parquet.hadoop.ParquetReader;
+import org.apache.parquet.hadoop.ParquetWriter;
+import org.apache.parquet.io.DelegatingSeekableInputStream;
+import org.apache.parquet.io.InputFile;
+import org.apache.parquet.io.OutputFile;
+import org.apache.parquet.io.PositionOutputStream;
+import org.apache.parquet.io.SeekableInputStream;
+
+/**
+ * IO to read and write Parquet files.
+ *
+ * <h3>Reading Parquet files</h3>
+ *
+ * <p>{@link ParquetIO} source returns a {@link PCollection} for
+ * Parquet files. The elements in the {@link PCollection} are Avro {@link
GenericRecord}.
+ *
+ * <p>To configure the {@link Read}, you have to provide the file patterns
(from) of the
+ * Parquet files and the coder.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ *
pipeline.apply(ParquetIO.read().from("/foo/bar")).setCoder(AvroCoder.of(SCHEMA));
+ * ...
+ * }
+ * </pre>
+ *
+ * <p>As {@link Read} is based on {@link FileIO}, it supports any filesystem
(hdfs, ...).
+ *
+ * <h3>Writing Parquet files</h3>
+ *
+ * <p>{@link ParquetIO.Sink} allows you to write a {@link PCollection} of
{@link GenericRecord}
+ * into a Parquet file. It can be used with the general-purpose {@link
FileIO}transforms.
+ *
+ * <p>For example:
+ *
+ * <pre>{@code
+ * pipeline
+ * .apply(...) // PCollection<GenericRecord>
+ * .apply(FileIO.<GenericRecord>
+ * .write()
+ * .via(ParquetIO.sink(SCHEMA))
+ * .to("destination/path")
+ * }</pre>
Review comment:
ok
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Issue Time Tracking
-------------------
Worklog Id: (was: 104569)
Time Spent: 11h 20m (was: 11h 10m)
> Create Parquet IO
> -----------------
>
> Key: BEAM-214
> URL: https://issues.apache.org/jira/browse/BEAM-214
> Project: Beam
> Issue Type: Improvement
> Components: io-ideas
> Reporter: Neville Li
> Assignee: Jean-Baptiste Onofré
> Priority: Minor
> Time Spent: 11h 20m
> Remaining Estimate: 0h
>
> Would be nice to support Parquet files with projection and predicates.
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