GzipCodec/CompressionOutputStream resetState() fails to reset gzip header and
CRC
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Key: HADOOP-6799
URL: https://issues.apache.org/jira/browse/HADOOP-6799
Project: Hadoop Common
Issue Type: Bug
Components: io
Affects Versions: 0.21.0
Environment: Linux/x86-32, Java 1.6.0_15
Reporter: Greg Roelofs
Priority: Minor
CompressionCodec gzip = new GzipCodec();
Path fnHDFS = new Path(workDir, "concat" + gzip.getDefaultExtension());
OutputStream out = localFs.create(fnHDFS);
Compressor gzCmp = gzip.createCompressor();
CompressionOutputStream gzOStm = gzip.createOutputStream(out, gzCmp);
gzOStm.write("first gzip concat\n member\nwith three lines\n".getBytes());
gzOStm.finish();
gzOStm.resetState();
gzOStm.write("2nd gzip concat member\n".getBytes());
gzOStm.finish();
gzOStm.resetState();
gzOStm.write("gzip concat\nmember #3\n".getBytes());
gzOStm.close();
This should create a 3-member concatenated gzip file (i.e., equivalent to
concatenation of three individual gzip files). However, resetState() simply
resets the underlying deflate engine; it does not reset the running CRC-32, nor
does it set a flag to write a new gzip header. As a result, the output stream
is corrupted--i.e., only the first member is readable.
I also have hex dumps, but they don't work well with proportional fonts.
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