[
https://issues.apache.org/jira/browse/PARQUET-1822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17733144#comment-17733144
]
ASF GitHub Bot commented on PARQUET-1822:
-----------------------------------------
amousavigourabi commented on code in PR #1111:
URL: https://github.com/apache/parquet-mr/pull/1111#discussion_r1231219827
##########
parquet-common/src/main/java/org/apache/parquet/io/LocalOutputFile.java:
##########
@@ -0,0 +1,107 @@
+/*
+ * 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.parquet.io;
+
+import java.io.BufferedOutputStream;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+
+/**
+ * {@code LocalOutputFile} is an implementation needed by Parquet to write
+ * to local data files using {@link PositionOutputStream} instances.
+ */
+public class LocalOutputFile implements OutputFile {
+
+ private class LocalPositionOutputStream extends PositionOutputStream {
+
+ private final BufferedOutputStream stream;
+ private long pos = 0;
+
+ public LocalPositionOutputStream(int buffer, StandardOpenOption...
openOption) throws IOException {
+ stream = new BufferedOutputStream(Files.newOutputStream(path,
openOption), buffer);
+ }
+
+ @Override
+ public long getPos() {
+ return pos;
+ }
+
+ @Override
+ public void write(int data) throws IOException {
+ pos++;
+ stream.write(data);
+ }
+
+ @Override
+ public void write(byte[] data) throws IOException {
+ pos += data.length;
+ stream.write(data);
+ }
+
+ @Override
+ public void write(byte[] data, int off, int len) throws IOException {
+ pos += len;
+ stream.write(data, off, len);
+ }
+
+ @Override
+ public void flush() throws IOException {
+ stream.flush();
+ }
+
+ @Override
+ public void close() throws IOException {
+ stream.close();
+ }
+ }
+
+ private final Path path;
+
+ public LocalOutputFile(Path file) {
+ path = file;
+ }
+
+ @Override
+ public PositionOutputStream create(long buffer) throws IOException {
+ return new LocalPositionOutputStream((int) buffer,
StandardOpenOption.CREATE_NEW);
+ }
+
+ @Override
+ public PositionOutputStream createOrOverwrite(long buffer) throws
IOException {
+ return new LocalPositionOutputStream((int) buffer,
StandardOpenOption.CREATE,
+ StandardOpenOption.TRUNCATE_EXISTING);
+ }
+
+ @Override
+ public boolean supportsBlockSize() {
+ return true;
+ }
+
+ @Override
+ public long defaultBlockSize() {
+ return 512;
Review Comment:
512 is just how the BufferedOutputStream behaves by default. It is
configurable via `create` and `createAndOverwrite` (as signalled by the `true`
return in `supportsBlockSize`)
> Parquet without Hadoop dependencies
> -----------------------------------
>
> Key: PARQUET-1822
> URL: https://issues.apache.org/jira/browse/PARQUET-1822
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-avro
> Affects Versions: 1.11.0
> Environment: Amazon Fargate (linux), Windows development box.
> We are writing Parquet to be read by the Snowflake and Athena databases.
> Reporter: mark juchems
> Priority: Minor
> Labels: documentation, newbie
>
> I have been trying for weeks to create a parquet file from avro and write to
> S3 in Java. This has been incredibly frustrating and odd as Spark can do it
> easily (I'm told).
> I have assembled the correct jars through luck and diligence, but now I find
> out that I have to have hadoop installed on my machine. I am currently
> developing in Windows and it seems a dll and exe can fix that up but am
> wondering about Linus as the code will eventually run in Fargate on AWS.
> *Why do I need external dependencies and not pure java?*
> The thing really is how utterly complex all this is. I would like to create
> an avro file and convert it to Parquet and write it to S3, but I am trapped
> in "ParquetWriter" hell!
> *Why can't I get a normal OutputStream and write it wherever I want?*
> I have scoured the web for examples and there are a few but we really need
> some documentation on this stuff. I understand that there may be reasons for
> all this but I can't find them on the web anywhere. Any help? Can't we get
> the "SimpleParquet" jar that does this:
>
> ParquetWriter writer =
> AvroParquetWriter.<GenericData.Record>builder(outputStream)
> .withSchema(avroSchema)
> .withConf(conf)
> .withCompressionCodec(CompressionCodecName.SNAPPY)
> .withWriteMode(Mode.OVERWRITE)//probably not good for prod. (overwrites
> files).
> .build();
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
