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https://issues.apache.org/jira/browse/AVRO-1339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thiruvalluvan M. G. updated AVRO-1339:
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Component/s: java
> AvroSequenceFile is always uncompressed
> ---------------------------------------
>
> Key: AVRO-1339
> URL: https://issues.apache.org/jira/browse/AVRO-1339
> Project: Apache Avro
> Issue Type: Bug
> Components: java
> Reporter: David Arthur
> Priority: Major
>
> It appears that AvroSequenceFile is not passing compression type/codec info
> down to the SequenceFile.Writer. This is because AvroSequenceFile.Writer is
> making a direct call to SequenceFile.Writer's public constructor rather than
> using one of the SequenceFile createWriter factory methods
> https://github.com/apache/avro/blob/trunk/lang/java/mapred/src/main/java/org/apache/avro/hadoop/io/AvroSequenceFile.java#L532
> Here is a bit of workaround code that I came up with
> {code:java}
> AvroSequenceFile.Writer.Options options = new
> AvroSequenceFile.Writer.Options()
> .withConfiguration(hdfsInfo.getConf())
> .withFileSystem(hdfsInfo.getFileSystem())
> .withOutputPath(hdfsInfo.getPath())
> .withCompressionType(configuration.getCompressionType())
> .withCompressionCodec(configuration.getCompressionCodec().getCodec())
> .withProgressable(new Progressable() {
> @Override
> public void progress(){
> }
> })
> .withKeySchema(configuration.getKeySchema())
> .withValueSchema(configuration.getValueSchema());
> // Have to do this here b/c it's hidden in a private method :(
> Metadata metadata = options.getMetadata();
> if (null != configuration.getKeySchema()) {
> metadata.set(AvroSequenceFile.METADATA_FIELD_KEY_SCHEMA, new
> Text(configuration.getKeySchema().toString()));
> }
> if (null != configuration.getValueSchema()) {
> metadata.set(AvroSequenceFile.METADATA_FIELD_VALUE_SCHEMA, new
> Text(configuration.getValueSchema().toString()));
> }
> return SequenceFile.createWriter(
> options.getFileSystem(),
> options.getConfigurationWithAvroSerialization(),
> options.getOutputPath(),
> options.getKeyClass(),
> options.getValueClass(),
> options.getBufferSizeBytes(),
> options.getReplicationFactor(),
> options.getBlockSizeBytes(),
> options.getCompressionType(),
> options.getCompressionCodec(),
> options.getProgressable(),
> metadata);
> {code}
> I used this code to write a BZIP2 block compressed sequence file, and was
> able to read it using the Avro mapreduce classes just fine.
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