private void readKeyValue(IFrameTupleReference tuple) throws HyracksDataException {
FrameTupleReference ftr = (FrameTupleReference) tuple;
IFrameTupleAccessor fta = ftr.getFrameTupleAccessor();
ByteBuffer buffer = fta.getBuffer();
int tIndex = ftr.getTupleIndex();
int keyStart =
fta.getFieldSlotsLength()
+ fta.getTupleStartOffset(tIndex)
+ fta.getFieldStartOffset(tIndex, 0);
int valueStart =
fta.getFieldSlotsLength()
+ fta.getTupleStartOffset(tIndex)
+ fta.getFieldStartOffset(tIndex, 1);
keyInputStream.setByteBuffer(buffer, keyStart);
valueInputStream.setByteBuffer(buffer, valueStart);
try {
// read key if necessary
if (!skipKey) {
key.readFields(keyInput);
}
// read value
value.readFields(valueInput);
} catch (Exception e) {
throw new HyracksDataException(e);
}
}
public void map(
WritableComparable key, Writable value, OutputCollector collector, Reporter reporter)
throws IOException {
// convert on the fly from old formats with UTF8 keys
if (key instanceof UTF8) {
newKey.set(key.toString());
key = newKey;
}
collector.collect(key, new ObjectWritable(value));
}
protected void setup(Context context) throws IOException, InterruptedException {
super.setup(context);
scriptEngine = scriptEngineManager.getEngineByName("JavaScript");
try {
Configuration configuration = context.getConfiguration();
mapOutputKey = MrUtils.getWritableComparableType("js.map.output.key.type", configuration);
mapOutputValue = MrUtils.getWritableComparableType("js.map.output.value.type", configuration);
scriptEngine.eval(
MrUtils.getScripts(
context.getConfiguration(), MrUtils.getPathFilter("js.map.filename", configuration)));
scriptEngine.put("mapOutputKey", mapOutputKey);
scriptEngine.put("mapOutputValue", mapOutputValue);
OUTPUT_KEY_CLASS = mapOutputKey.getClass();
OUTPUT_VALUE_CLASS = mapOutputValue.getClass();
} catch (ScriptException se) {
IOException ioe = new IOException(se);
ioe.setStackTrace(se.getStackTrace());
throw ioe;
}
}
public int read() throws IOException {
int ret;
if (null == inbuf || -1 == (ret = inbuf.read())) {
if (!r.next(key, val)) {
return -1;
}
byte[] tmp = key.toString().getBytes();
outbuf.write(tmp, 0, tmp.length);
outbuf.write('\t');
tmp = val.toString().getBytes();
outbuf.write(tmp, 0, tmp.length);
outbuf.write('\n');
inbuf.reset(outbuf.getData(), outbuf.getLength());
outbuf.reset();
ret = inbuf.read();
}
return ret;
}
public void map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter)
throws IOException {
// convert on the fly from the old format
if (key instanceof UTF8) {
newKey.set(key.toString());
key = newKey;
}
if (filters != null) {
try {
if (filters.filter(((Text) key).toString()) == null) {
return;
}
} catch (Exception e) {
if (LOG.isWarnEnabled()) {
LOG.warn("Cannot filter key " + key + ": " + e.getMessage());
}
}
}
output.collect(key, value);
}
public void reduce(
WritableComparable key, Iterator values, OutputCollector output, Reporter reporter)
throws IOException {
StringBuffer dump = new StringBuffer();
dump.append("\nRecno:: ").append(recNo++).append("\n");
dump.append("URL:: " + key.toString() + "\n");
while (values.hasNext()) {
Object value = ((ObjectWritable) values.next()).get(); // unwrap
if (value instanceof CrawlDatum) {
dump.append("\nCrawlDatum::\n").append(((CrawlDatum) value).toString());
} else if (value instanceof Content) {
dump.append("\nContent::\n").append(((Content) value).toString());
} else if (value instanceof ParseData) {
dump.append("\nParseData::\n").append(((ParseData) value).toString());
} else if (value instanceof ParseText) {
dump.append("\nParseText::\n").append(((ParseText) value).toString());
} else if (LOG.isWarnEnabled()) {
LOG.warn("Unrecognized type: " + value.getClass());
}
}
output.collect(key, new ObjectWritable(dump.toString()));
}
public int compare(WritableComparable a, WritableComparable b) {
String aStr = a.toString();
String bStr = b.toString();
return compareStr(aStr, bStr);
}
@SuppressWarnings("unchecked")
public void map(
WritableComparable key,
Writable value,
OutputCollector<IntWritable, RecordStatsWritable> output,
Reporter reporter)
throws IOException {
// Set up rawKey and rawValue on the first call to 'map'
if (recordId == -1) {
rawKey = createRaw(key.getClass());
rawValue = createRaw(value.getClass());
}
++recordId;
if (this.key == sortOutput) {
// Check if keys are 'sorted' if this
// record is from sort's output
if (prevKey == null) {
prevKey = key;
keyClass = prevKey.getClass();
} else {
// Sanity check
if (keyClass != key.getClass()) {
throw new IOException(
"Type mismatch in key: expected "
+ keyClass.getName()
+ ", recieved "
+ key.getClass().getName());
}
// Check if they were sorted correctly
if (prevKey.compareTo(key) > 0) {
throw new IOException(
"The 'map-reduce' framework wrongly"
+ " classifed ("
+ prevKey
+ ") > ("
+ key
+ ") "
+ "for record# "
+ recordId);
}
prevKey = key;
}
// Check if the sorted output is 'partitioned' right
int keyPartition = partitioner.getPartition(key, value, noSortReducers);
if (partition != keyPartition) {
throw new IOException(
"Partitions do not match for record# "
+ recordId
+ " ! - '"
+ partition
+ "' v/s '"
+ keyPartition
+ "'");
}
}
// Construct the record-stats and output (this.key, record-stats)
byte[] keyBytes = rawKey.getRawBytes(key);
int keyBytesLen = rawKey.getRawBytesLength(key);
byte[] valueBytes = rawValue.getRawBytes(value);
int valueBytesLen = rawValue.getRawBytesLength(value);
int keyValueChecksum =
(WritableComparator.hashBytes(keyBytes, keyBytesLen)
^ WritableComparator.hashBytes(valueBytes, valueBytesLen));
output.collect(
this.key, new RecordStatsWritable((keyBytesLen + valueBytesLen), 1, keyValueChecksum));
}