BlockDecompressorStream#decompress ultimately calls rawReadInt, which will throw EOFException instead of return -1 when encountering end of a stream. Then, decompress will be called by read. However, InputStream#read is supposed to return -1 instead of throwing EOFException to indicate the end of a stream. This explains why in LineReader,
-1 is checked instead of catching EOFException.
Now the problem will occur with SnappyCodec. If an input file is compressed with SnappyCodec, it needs to be decompressed through BlockDecompressorStream when it is read. Then, if it empty, EOFException will been thrown from rawReadInt and break LineReader.