/** Configures the Reduce plan, the POPackage operator and the reporter thread */
@SuppressWarnings("unchecked")
@Override
protected void setup(Context context) throws IOException, InterruptedException {
super.setup(context);
inIllustrator = inIllustrator(context);
if (inIllustrator) pack = getPack(context);
Configuration jConf = context.getConfiguration();
SpillableMemoryManager.configure(ConfigurationUtil.toProperties(jConf));
context
.getConfiguration()
.set(
PigConstants.TASK_INDEX,
Integer.toString(context.getTaskAttemptID().getTaskID().getId()));
sJobContext = context;
sJobConfInternal.set(context.getConfiguration());
sJobConf = context.getConfiguration();
try {
PigContext.setPackageImportList(
(ArrayList<String>) ObjectSerializer.deserialize(jConf.get("udf.import.list")));
pigContext = (PigContext) ObjectSerializer.deserialize(jConf.get("pig.pigContext"));
// This attempts to fetch all of the generated code from the distributed cache, and resolve
// it
SchemaTupleBackend.initialize(jConf, pigContext);
if (rp == null)
rp = (PhysicalPlan) ObjectSerializer.deserialize(jConf.get("pig.reducePlan"));
stores = PlanHelper.getPhysicalOperators(rp, POStore.class);
if (!inIllustrator)
pack = (POPackage) ObjectSerializer.deserialize(jConf.get("pig.reduce.package"));
// To be removed
if (rp.isEmpty()) log.debug("Reduce Plan empty!");
else {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
rp.explain(baos);
log.debug(baos.toString());
}
pigReporter = new ProgressableReporter();
if (!(rp.isEmpty())) {
roots = rp.getRoots().toArray(new PhysicalOperator[1]);
leaf = rp.getLeaves().get(0);
}
// Get the UDF specific context
MapRedUtil.setupUDFContext(jConf);
} catch (IOException ioe) {
String msg = "Problem while configuring reduce plan.";
throw new RuntimeException(msg, ioe);
}
log.info(
"Aliases being processed per job phase (AliasName[line,offset]): "
+ jConf.get("pig.alias.location"));
Utils.setDefaultTimeZone(PigMapReduce.sJobConfInternal.get());
}
@SuppressWarnings("unchecked")
@Override
public void prepareToRead(RecordReader reader, PigSplit split) throws IOException {
this.reader = reader;
final String resourceSchemaAsStr =
getValueFromUDFContext(this.contextSignature, RESOURCE_SCHEMA_SIGNATURE);
if (resourceSchemaAsStr == null) {
throw new IOException("Could not find schema in UDF context");
}
schema = (ResourceSchema) ObjectSerializer.deserialize(resourceSchemaAsStr);
}
@Override
public void prepareToRead(RecordReader recordReader, PigSplit pigSplit) throws IOException {
reader = recordReader;
if (!requiredFieldsInitialized) {
UDFContext udfc = UDFContext.getUDFContext();
Properties p = udfc.getUDFProperties(this.getClass(), new String[] {udfContextSignature});
requiredFields =
(boolean[]) ObjectSerializer.deserialize(p.getProperty(REQUIRED_FIELDS_SIGNATURE));
requiredFieldsInitialized = true;
}
}
public void setConf(Configuration conf) {
try {
mAsc = (boolean[]) ObjectSerializer.deserialize(conf.get("pig.sortOrder"));
} catch (IOException ioe) {
mLog.error("Unable to deserialize pig.sortOrder " + ioe.getMessage());
throw new RuntimeException(ioe);
}
if (mAsc == null) {
mAsc = new boolean[1];
mAsc[0] = true;
}
}
public void setConf(Configuration conf) {
if (!(conf instanceof JobConf)) {
mLog.warn("Expected jobconf in setConf, got " + conf.getClass().getName());
return;
}
JobConf jconf = (JobConf) conf;
try {
mAsc = (boolean[]) ObjectSerializer.deserialize(jconf.get("pig.sortOrder"));
} catch (IOException ioe) {
mLog.error("Unable to deserialize pig.sortOrder " + ioe.getMessage());
throw new RuntimeException(ioe);
}
if (mAsc == null) {
mAsc = new boolean[1];
mAsc[0] = true;
}
// If there's only one entry in mAsc, it means it's for the whole
// tuple. So we can't be looking for each column.
mWholeTuple = (mAsc.length == 1);
}
public static Properties getJobConf(Configuration conf) {
if (conf == null) {
return null;
}
Properties jobConfProperties = null;
try {
jobConfProperties = new Properties();
for (Map.Entry<String, String> entry : conf) {
if (entry.getKey().equals("pig.mapPlan") || entry.getKey().equals("pig.reducePlan")) {
jobConfProperties.setProperty(
entry.getKey(), ObjectSerializer.deserialize(entry.getValue()).toString());
} else if (JOB_CONF_KEYS.contains(entry.getKey())) {
jobConfProperties.setProperty(entry.getKey(), entry.getValue());
}
}
} catch (IOException e) {
logger.warn("Error while reading job conf: " + e.getMessage());
}
return jobConfProperties;
}
/* (non-Javadoc)
* @see org.apache.pig.builtin.PigStorage#getNext()
*/
@Override
public Tuple getNext() throws IOException {
// If SKIP_INPUT_HEADER and this is the first input split, skip header record
// We store its value as a string though, so we can compare
// further records to it. If they are the same (this would
// happen if multiple small files each with a header were combined
// into one split), we know to skip the duplicate header record as well.
if (loadingFirstRecord
&& headerTreatment == Headers.SKIP_INPUT_HEADER
&& (splitIndex == 0 || splitIndex == -1)) {
try {
if (!in.nextKeyValue()) return null;
header = ((Text) in.getCurrentValue()).toString();
} catch (InterruptedException e) {
int errCode = 6018;
String errMsg = "Error while reading input";
throw new ExecException(errMsg, errCode, PigException.REMOTE_ENVIRONMENT, e);
}
}
loadingFirstRecord = false;
mProtoTuple = new ArrayList<Object>();
getNextInQuotedField = false;
boolean evenQuotesSeen = true;
boolean sawEmbeddedRecordDelimiter = false;
byte[] buf = null;
if (!mRequiredColumnsInitialized) {
if (udfContextSignature != null) {
Properties p = UDFContext.getUDFContext().getUDFProperties(this.getClass());
mRequiredColumns =
(boolean[]) ObjectSerializer.deserialize(p.getProperty(udfContextSignature));
}
mRequiredColumnsInitialized = true;
}
// Note: we cannot factor out the check for nextKeyValue() being null,
// because that call overwrites buf with the new line, which is
// bad if we have a field with a newline.
try {
int recordLen = 0;
getNextFieldID = 0;
while (sawEmbeddedRecordDelimiter || getNextFieldID == 0) {
Text value = null;
if (sawEmbeddedRecordDelimiter) {
// Deal with pulling more records from the input, because
// a double quoted embedded newline was encountered in a field.
// Save the length of the record so far, plus one byte for the
// record delimiter (usually newline) that's embedded in the field
// we were working on before falling into this branch:
int prevLineLen = recordLen + 1;
// Save previous line (the one with the field that has the newline) in a new array.
// The last byte will be random; we'll fill in the embedded
// record delimiter (usually newline) below:
byte[] prevLineSaved = Arrays.copyOf(buf, prevLineLen);
prevLineSaved[prevLineLen - 1] = RECORD_DEL;
// Read the continuation of the record, unless EOF:
if (!in.nextKeyValue()) {
return null;
}
value = (Text) in.getCurrentValue();
recordLen = value.getLength();
// Grab the continuation's bytes:
buf = value.getBytes();
// Combine the previous line and the continuation into a new array.
// The following copyOf() does half the job: it allocates all the
// space, and also copies the previous line into that space:
byte[] prevLineAndContinuation = Arrays.copyOf(prevLineSaved, prevLineLen + recordLen);
// Now append the continuation. Parms: fromBuf, fromStartPos, toBuf, toStartPos,
// lengthToCopy:
System.arraycopy(buf, 0, prevLineAndContinuation, prevLineLen, recordLen);
// We'll work with the combination now:
buf = prevLineAndContinuation;
// Do the whole record over from the start:
mProtoTuple.clear();
getNextInQuotedField = false;
evenQuotesSeen = true;
getNextFieldID = 0;
recordLen = prevLineAndContinuation.length;
} else {
// Previous record finished cleanly: start with the next record,
// unless EOF:
if (!in.nextKeyValue()) {
return null;
}
value = (Text) in.getCurrentValue();
// if the line is a duplicate header and 'SKIP_INPUT_HEADER' is set, ignore it
// (this might happen if multiple files each with a header are combined into a single
// split)
if (headerTreatment == Headers.SKIP_INPUT_HEADER && value.toString().equals(header)) {
if (!in.nextKeyValue()) return null;
value = (Text) in.getCurrentValue();
}
buf = value.getBytes();
getNextFieldID = 0;
recordLen = value.getLength();
}
nextTupleSkipChar = false;
ByteBuffer fieldBuffer = ByteBuffer.allocate(recordLen);
sawEmbeddedRecordDelimiter =
processOneInRecord(evenQuotesSeen, buf, recordLen, fieldBuffer);
// The last field is never delimited by a FIELD_DEL, but by
// the end of the record. So we need to add that last field.
// The '!sawEmbeddedRecordDelimiter' handles the case of
// embedded newlines; we are amidst a field, not at
// the final record:
if (!sawEmbeddedRecordDelimiter) readField(fieldBuffer, getNextFieldID++);
} // end while
} catch (InterruptedException e) {
int errCode = 6018;
String errMsg = "Error while reading input";
throw new ExecException(errMsg, errCode, PigException.REMOTE_ENVIRONMENT, e);
}
Tuple t = mTupleFactory.newTupleNoCopy(mProtoTuple);
return t;
}
