public String exec(Tuple input) throws IOException {
if (input == null || input.size() == 0) return null;
try {
DataBag bag = (DataBag) input.get(0);
StringBuilder sb = new StringBuilder();
for (Iterator<Tuple> iter = bag.iterator(); iter.hasNext(); ) {
Tuple next = iter.next();
sb.append(next.get(0).toString());
if (iter.hasNext()) sb.append(" ");
}
return sb.toString();
} catch (Exception e) {
System.err.println("StrJoin_Exception " + e.getClass().getName());
if (PigStatusReporter.getInstance() != null) {
PigStatusReporter.getInstance()
.getCounter("StrJoin_Exception", e.getClass().getName())
.increment(1);
}
return null;
}
}
/**
* The reduce function which packages the key and List<Tuple> into key, Bag<Tuple>
* after converting Hadoop type key into Pig type. The package result is either collected as is,
* if the reduce plan is empty or after passing through the reduce plan.
*/
@Override
protected void reduce(PigNullableWritable key, Iterable<NullableTuple> tupIter, Context context)
throws IOException, InterruptedException {
if (!initialized) {
initialized = true;
// cache the collector for use in runPipeline()
// which could additionally be called from close()
this.outputCollector = context;
pigReporter.setRep(context);
PhysicalOperator.setReporter(pigReporter);
boolean aggregateWarning =
"true".equalsIgnoreCase(pigContext.getProperties().getProperty("aggregate.warning"));
PigStatusReporter pigStatusReporter = PigStatusReporter.getInstance();
pigStatusReporter.setContext(new MRTaskContext(context));
PigHadoopLogger pigHadoopLogger = PigHadoopLogger.getInstance();
pigHadoopLogger.setReporter(pigStatusReporter);
pigHadoopLogger.setAggregate(aggregateWarning);
PhysicalOperator.setPigLogger(pigHadoopLogger);
if (!inIllustrator)
for (POStore store : stores) {
MapReducePOStoreImpl impl = new MapReducePOStoreImpl(context);
store.setStoreImpl(impl);
store.setUp();
}
}
// In the case we optimize the join, we combine
// POPackage and POForeach - so we could get many
// tuples out of the getnext() call of POJoinPackage
// In this case, we process till we see EOP from
// POJoinPacakage.getNext()
if (pack.getPkgr() instanceof JoinPackager) {
pack.attachInput(key, tupIter.iterator());
while (true) {
if (processOnePackageOutput(context)) break;
}
} else {
// join is not optimized, so package will
// give only one tuple out for the key
pack.attachInput(key, tupIter.iterator());
processOnePackageOutput(context);
}
}
@Override
public Tuple exec(Tuple input) throws IOException {
myreporter = PigStatusReporter.getInstance();
if (input == null || input.size() == 0) {
return null;
}
try {
DataByteArray dba = null;
DocumentMetadata dm = null;
String title = null;
String doi = null;
String year = null;
try {
dba = (DataByteArray) input.get(0);
} catch (Exception e) {
myreporter.getCounter("extraction problems", "DataByteArray from tuple");
return null;
}
try {
dm = DocumentWrapper.parseFrom(dba.get()).getDocumentMetadata();
} catch (Exception e) {
myreporter.getCounter("extraction problems", "document metadata");
return null;
}
try {
for (TextWithLanguage twl : dm.getBasicMetadata().getTitleList()) {
if (twl.getLanguage().toLowerCase().startsWith("en")) {
title = twl.getText();
break;
}
}
if (title == null) {
title = dm.getBasicMetadata().getTitle(0).getText();
}
if (title != null && !title.trim().isEmpty()) {
title = DiacriticsRemover.removeDiacritics(title);
title = title.replaceAll("[^A-Za-z0-9\\-_]", " ").replaceAll("\\s++", " ").trim();
}
} catch (Exception e) {
} finally {
if (title == null || title.trim().isEmpty()) {
myreporter.getCounter("extraction problems", "title extraction");
return null;
}
}
try {
doi = dm.getBasicMetadata().getDoi().replaceAll("\\s++", " ").trim();
} catch (Exception e) {
} finally {
if (doi == null || doi.trim().isEmpty()) {
myreporter.getCounter("extraction problems", "doi extraction");
return null;
}
}
try {
year = dm.getBasicMetadata().getYear().replaceAll("\\s++", " ").trim();
} catch (Exception e) {
} finally {
if (year == null || year.trim().isEmpty()) {
myreporter.getCounter("extraction problems", "year extraction");
return null;
}
}
Tuple t = TupleFactory.getInstance().newTuple();
t.append(doi);
t.append(year);
t.append(title);
return t;
} catch (Exception e) {
logger.debug(StackTraceExtractor.getStackTrace(e));
throw new IOException(e);
}
}
/**
* The reduce function which packages the key and List<Tuple> into key, Bag<Tuple>
* after converting Hadoop type key into Pig type. The package result is either collected as is,
* if the reduce plan is empty or after passing through the reduce plan.
*/
@Override
protected void reduce(PigNullableWritable key, Iterable<NullableTuple> tupIter, Context context)
throws IOException, InterruptedException {
if (!initialized) {
initialized = true;
// cache the collector for use in runPipeline()
// which could additionally be called from close()
this.outputCollector = context;
pigReporter.setRep(context);
PhysicalOperator.setReporter(pigReporter);
boolean aggregateWarning =
"true".equalsIgnoreCase(pigContext.getProperties().getProperty("aggregate.warning"));
PigStatusReporter pigStatusReporter = PigStatusReporter.getInstance();
pigStatusReporter.setContext(new MRTaskContext(context));
PigHadoopLogger pigHadoopLogger = PigHadoopLogger.getInstance();
pigHadoopLogger.setReporter(pigStatusReporter);
pigHadoopLogger.setAggregate(aggregateWarning);
PhysicalOperator.setPigLogger(pigHadoopLogger);
for (POStore store : stores) {
MapReducePOStoreImpl impl = new MapReducePOStoreImpl(context);
store.setStoreImpl(impl);
store.setUp();
}
}
// If the keyType is not a tuple, the MapWithComparator.collect()
// would have wrapped the key into a tuple so that the
// comparison UDF used in the order by can process it.
// We need to unwrap the key out of the tuple and hand it
// to the POPackage for processing
if (keyType != DataType.TUPLE) {
Tuple t = (Tuple) (key.getValueAsPigType());
try {
key = HDataType.getWritableComparableTypes(t.get(0), keyType);
} catch (ExecException e) {
throw e;
}
}
pack.attachInput(key, tupIter.iterator());
Result res = pack.getNextTuple();
if (res.returnStatus == POStatus.STATUS_OK) {
Tuple packRes = (Tuple) res.result;
if (rp.isEmpty()) {
context.write(null, packRes);
return;
}
rp.attachInput(packRes);
List<PhysicalOperator> leaves = rp.getLeaves();
PhysicalOperator leaf = leaves.get(0);
runPipeline(leaf);
}
if (res.returnStatus == POStatus.STATUS_NULL) {
return;
}
if (res.returnStatus == POStatus.STATUS_ERR) {
int errCode = 2093;
String msg = "Encountered error in package operator while processing group.";
throw new ExecException(msg, errCode, PigException.BUG);
}
}