[HADOOP-6663] BlockDecompressorStream get EOF exception when decompressing the file compressed from empty file

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.20.2
• Fix Version/s: 0.22.0
• Component/s: io
• Labels: BlockDecompressorStream compress hadoop io
• Hadoop Flags: Reviewed
• Release Note: Fix EOF exception in BlockDecompressorStream when decompressing previous compressed empty file
• Tags: hadoop io compress BlockDecompressorStream
• Assignee: Kang Xiao
• Reporter: Kang Xiao
• Created: 29/Mar/10 08:17
• Updated: 12/Dec/11 06:20
• Resolved: 28/Oct/10 17:18

Description

An empty file can be compressed using BlockDecompressorStream, which is for block-based compressiong algorithm such as LZO. However, when decompressing the compressed file, BlockDecompressorStream get EOF exception.

Here is a typical exception stack:

java.io.EOFException
at org.apache.hadoop.io.compress.BlockDecompressorStream.rawReadInt(BlockDecompressorStream.java:125)
at org.apache.hadoop.io.compress.BlockDecompressorStream.getCompressedData(BlockDecompressorStream.java:96)
at org.apache.hadoop.io.compress.BlockDecompressorStream.decompress(BlockDecompressorStream.java:82)
at org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:74)
at java.io.InputStream.read(InputStream.java:85)
at org.apache.hadoop.util.LineReader.readLine(LineReader.java:134)
at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:134)
at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:39)
at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.moveToNext(MapTask.java:186)
at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.next(MapTask.java:170)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:48)
at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:18)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:334)
at org.apache.hadoop.mapred.Child.main(Child.java:196)