Configuration newConf = new Configuration(conf);
newConf.setInt("io.seqfile.compress.blocksize", 100000);
MyMapFile.Writer out = new MyMapFile.Writer(newConf, fs, tmpFile, MemKey.class, Value.class, MySequenceFile.CompressionType.BLOCK);
InterruptibleIterator iter = map.skvIterator();
iter.seek(new Range(), LocalityGroupUtil.EMPTY_CF_SET, false);
while (iter.hasTop() && activeIters.size() > 0) {
out.append(iter.getTopKey(), iter.getTopValue());
iter.next();
}