@Override
public void map(
WritableComparable key,
CompactorInputSplit split,
OutputCollector<NullWritable, NullWritable> nullWritableVOutputCollector,
Reporter reporter)
throws IOException {
// This will only get called once, since CompactRecordReader only returns one record,
// the input split.
// Based on the split we're passed we go instantiate the real reader and then iterate on it
// until it finishes.
@SuppressWarnings("unchecked") // since there is no way to parametrize instance of Class
AcidInputFormat<WritableComparable, V> aif =
instantiate(AcidInputFormat.class, jobConf.get(INPUT_FORMAT_CLASS_NAME));
ValidTxnList txnList = new ValidReadTxnList(jobConf.get(ValidTxnList.VALID_TXNS_KEY));
boolean isMajor = jobConf.getBoolean(IS_MAJOR, false);
AcidInputFormat.RawReader<V> reader =
aif.getRawReader(
jobConf,
isMajor,
split.getBucket(),
txnList,
split.getBaseDir(),
split.getDeltaDirs());
RecordIdentifier identifier = reader.createKey();
V value = reader.createValue();
getWriter(reporter, reader.getObjectInspector(), split.getBucket());
while (reader.next(identifier, value)) {
if (isMajor && reader.isDelete(value)) continue;
writer.write(value);
reporter.progress();
}
}
@Override
public boolean next(NullWritable key, CompactorInputSplit compactorInputSplit)
throws IOException {
if (split != null) {
compactorInputSplit.set(split);
split = null;
return true;
}
return false;
}