[jira] [Updated] (AVRO-2511) Avro Java DataFileWriter Flush() does not flush the buffer to disk

["Christophe Le Saec (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AVRO-2511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Christophe Le Saec updated AVRO-2511:
-------------------------------------
    Status: Patch Available  (was: Open)

> Avro Java DataFileWriter Flush() does not flush the buffer to disk
> ------------------------------------------------------------------
>
>                 Key: AVRO-2511
>                 URL: https://issues.apache.org/jira/browse/AVRO-2511
>             Project: Apache Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.9.0
>            Reporter: Asen Milchev Kolev
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> If you try to use flush() with output stream instead of a file, the buffer is not flushed to disk. Here is an example how I'm using it and there is no chance to see data flushed to disk! Is that by design or it is a bug? I really need this in order to determine file size and create a new one when max file size is reached!
> {code:java}
> ........
> try (DataFileWriter<GenericRecord> dataFileWriter = new DataFileWriter<>(new GenericDatumWriter<>());                     DataFileStream<GenericRecord> dataFileStreamReader = new DataFileStream<>(is, new GenericDatumReader<GenericRecord>()))               
>  {                    
>     dataFileWriter.setFlushOnEveryBlock(true);                    
>     FSDataOutputStream hdfsOutputStream = null;                    
>     dataFileWriter.setCodec(codecFactory);                    
>     Schema schema = dataFileStreamReader.getSchema();                    
>     if (fileMode.equals(FileMode.APPEND))
>     {
>       FileContext fc = FileContext.getFileContext(hdfsConfiguration);
>       hdfsOutputStream = fileSystem.append(hdfsPath);
>       dataFileWriter.appendTo(new AvroFSInput(fc, hdfsPath), hdfsOutputStream);
>     }
>     else
>     {
>       hdfsOutputStream = fileSystem.create(hdfsPath);                        
>       fileManager.setCreationTime(hdfsPath);
>       dataFileWriter.create(schema, hdfsOutputStream);
>     }
>     
>     GenericRecord genericRecord = null;
>     while (dataFileStreamReader.hasNext())
>     {
>       if (fileManager.isLimitsReached())
>       {                            
>         IOUtils.closeStream(dataFileWriter);
>         fileSystem.rename(hdfsPath, fileManager.getFinalPath(hdfsPath));
>         LOG.info("Avro write completed for {0}", hdfsPath.toString());
>         hdfsPath = fileManager.getPath();
>         storePaths.add(hdfsPath);
>         hdfsOutputStream = fileSystem.create(hdfsPath);
>         fileManager.setCreationTime(hdfsPath);
>         dataFileWriter.setCodec(codecFactory);                            
>         dataFileWriter.create(schema, hdfsOutputStream);
>         LOG.info("Initiate Avro write to {0}", hdfsPath.toString());
>       }                        
>       genericRecord = dataFileStreamReader.next(genericRecord);
>       dataFileWriter.append(genericRecord);
>       // doesn't work at all when we are using streams (i.e. dataFileWriter.create(schema, hdfsOutputStream);) and not directly files (i.e. dataFileWriter.create(schema, new File("..."));)! 
>       dataFileWriter.flush();                        
>       fileManager.updateEntryCount(hdfsPath);
>   }
> {code}



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