Add a tell() method to DataFileReader.java which returns the position in a file
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Key: AVRO-252
URL: https://issues.apache.org/jira/browse/AVRO-252
Project: Avro
Issue Type: Improvement
Components: java
Reporter: Robert Goodman
Priority: Minor
A RecordReader needs to be able to get the current position in the file to
determine when it has reached the end of a file split and to handle errors.
This improvement will add a tell() method to DataFileReader.java which returns
the position in a file. The position returned by the tell() method will only
change when crossing a block boundary in a file. The position does not
increment as DataFileReader.java processes data within a block.
This will allow a RecordReader to do a simple check for when the position
returned by tell() is past the end of a file split to know when to stop
reading. The RecordReader will also be able to recover from errors by calling
sync(tell()) to sync to the next block and attempting to continue reading.
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