[jira] [Updated] (AVRO-1339) AvroSequenceFile is always uncompressed

["Thiruvalluvan M. G. (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AVRO-1339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thiruvalluvan M. G. updated AVRO-1339:
--------------------------------------
    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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