public Map<String, Pipe> getTailsByName() {
Map<String, Pipe> tails = Maps.newHashMap();
for (Pipe pipe : getTails()) {
tails.put(pipe.getName(), pipe);
}
return tails;
}
/**
* Get the name of this pipe. Guaranteed non-null.
*
* @return String the name of this pipe
*/
public String getName() {
if (name != null) return name;
if (previous != null) return previous.getName();
return "ANONYMOUS";
}
/**
* Opens the sink the flow. Only valid after evaluation was completed
*
* @return a tuple entry iterator
* @throws IOException
*/
public TupleEntryIterator openSink() throws IOException {
if (flow == null) {
return null;
}
return flow.openSink(pipe.getName());
// Hfs hfs = new Hfs(Fields.ALL, path);
// return hfs.openForRead(mConfiguration.jobConf);
}
private static void collectNames(Pipe[] pipes, Set<String> names) {
for (Pipe pipe : pipes) {
if (pipe instanceof SubAssembly)
names.addAll(Arrays.asList(((SubAssembly) pipe).getTailNames()));
else names.add(pipe.getName());
collectNames(SubAssembly.unwind(pipe.getPrevious()), names);
}
}
/*
* creates and processes a flow identified by {@code flowIdentificator}
* results are stored at {@code output} under the result named {@code resultName}
*/
private boolean processFlow(String resultName, String flowIdentificator, String output)
throws IOException {
boolean hasNewInferences = false;
String flowName = resultName + flowIdentificator;
Map<String, Tap> sources = prepareSourceTaps();
SequenceFile sinkScheme = new SequenceFile(fields);
// sinkScheme.setNumSinkParts(1); //FIXME
Tap headSink = new Hfs(sinkScheme, output, true);
Map<String, Tap> sinks = new HashMap<String, Tap>();
List<Pipe> pipes = new ArrayList<Pipe>();
sinks.put(pipe.getName(), headSink);
pipes.add(pipe);
if (mConfiguration.doPredicateIndexing) {
// calculate the count of the result and write it in the configuration
// if the predicate is a variable then we have to split also the result and put it in the
// right location
setupPredicateCounts(pipe, sinks, pipes);
}
flow =
new FlowConnector(mConfiguration.flowProperties)
.connect(flowName, sources, sinks, pipes.toArray(new Pipe[0]));
if (flow != null) {
// flow.writeDOT("flow.dot");
}
flow.complete();
try {
TupleEntryIterator iterator = flow.openSink(pipe.getName());
if (iterator.hasNext()) {
hasNewInferences = true;
}
iterator.close();
} catch (IOException e) {
logger.error("io exception", e);
throw new RuntimeException("io exception", e);
}
if (!hasNewInferences) {
deleteResults(new Path(path));
} else {
// merge part files FIXME
FileSystem fs = FileSystem.get(mConfiguration.hadoopConfiguration);
// delete empty results (could be from reducers running on no data)
int index = 0;
while (true) {
String value = String.valueOf(index);
String file = path + "/" + "part-" + "00000".substring(0, 5 - value.length()) + value;
Path filePath = new Path(file);
if (fs.exists(filePath)) {
Tap source = new Hfs(new Fields(0, 1, 2), file);
TupleEntryIterator tei = source.openForRead(mConfiguration.jobConf);
boolean noData = !tei.hasNext();
tei.close();
if (noData) {
logger.info("delete empty result : " + file);
fs.delete(filePath, false);
}
} else {
break;
}
index++;
}
}
if (hasNewInferences && mConfiguration.doPredicateIndexing) {
FileSystem fs = FileSystem.get(mConfiguration.hadoopConfiguration);
// update counts in configuration
List<PredicateCount> predicateCounts = Utils.readPredicateCounts(flow, "predicatesPipe");
distributedFileSystemManager.addPredicates(predicateCounts);
if (ruleStreams.getHeadStream().getPredicate() == null) {
// split result to the right locations (for variable predicate)
Tap source = new Hfs(sinkScheme, output, true);
Utils.splitStreamPerPredicates(
mConfiguration,
distributedFileSystemManager,
source,
predicateCounts,
resultName,
flowIdentificator);
fs.delete(new Path(output), true);
}
distributedFileSystemManager.savePredicateConfig();
String predicateGroupsTempPath =
distributedFileSystemManager.getPredicateGroupsTempPath(mConfiguration.resultsName);
fs.delete(new Path(predicateGroupsTempPath), true);
}
return hasNewInferences;
}
@Override
HadoopFlow createFlow() throws IOException {
// copy flowDef
FlowDef def = FlowDef.flowDef();
if (flowDef != null) {
def.addSinks(flowDef.getSinksCopy())
.addSources(flowDef.getSourcesCopy())
.addTraps(flowDef.getTrapsCopy())
.addTails(flowDef.getTailsArray())
.setAssertionLevel(flowDef.getAssertionLevel())
.setDebugLevel(flowDef.getDebugLevel())
.addCheckpoints(flowDef.getCheckpointsCopy())
.addTags(flowDef.getTags())
.setName(flowDef.getName());
}
Set<Pipe> heads = new LinkedHashSet<Pipe>();
if (tails != null) {
for (Pipe pipe : tails) {
Collections.addAll(heads, pipe.getHeads());
}
}
Pipe pipe = null;
if (heads.size() == 1) {
pipe = heads.iterator().next();
}
if (sources != null && sources.size() == 1) {
Tap tap = sources.remove(MARKER);
if (tap != null) {
sources.put(pipe.getName(), tap);
}
}
if (sinks != null && sinks.size() == 1) {
Tap tap = sinks.remove(MARKER);
if (tap != null) {
sinks.put(pipe.getName(), tap);
}
}
def.addSources(sources).addSinks(sinks).addTraps(traps);
if (tails != null) {
def.addTails(tails);
}
if (StringUtils.hasText(beanName)) {
def.addTag(beanName);
if (!StringUtils.hasText(def.getName())) {
def.setName(beanName);
}
}
Configuration cfg = ConfigurationUtils.createFrom(configuration, properties);
Properties props = ConfigurationUtils.asProperties(cfg);
if (jarSetup) {
if (jar != null) {
AppProps.setApplicationJarPath(props, ResourceUtils.decode(jar.getURI().toString()));
} else if (jarClass != null) {
AppProps.setApplicationJarClass(props, jarClass);
} else {
// auto-detection based on the classpath
ClassLoader cascadingCL = Cascade.class.getClassLoader();
Resource cascadingCore = ResourceUtils.findContainingJar(Cascade.class);
Resource cascadingHadoop =
ResourceUtils.findContainingJar(cascadingCL, "cascading/flow/hadoop/HadoopFlow.class");
// find jgrapht
Resource jgrapht = ResourceUtils.findContainingJar(cascadingCL, "org/jgrapht/Graph.class");
Assert.notNull(cascadingCore, "Cannot find cascading-core.jar");
Assert.notNull(cascadingHadoop, "Cannot find cascading-hadoop.jar");
Assert.notNull(jgrapht, "Cannot find jgraphts-jdk.jar");
if (log.isDebugEnabled()) {
log.debug(
"Auto-detecting Cascading Libs ["
+ Arrays.toString(new Resource[] {cascadingCore, cascadingHadoop, jgrapht})
+ "]");
}
ConfigurationUtils.addLibs(cfg, cascadingCore, cascadingHadoop, jgrapht);
// config changed, reinit properties
props = ConfigurationUtils.asProperties(cfg);
}
}
if (jobPoolingInterval != null) {
FlowProps.setJobPollingInterval(props, jobPoolingInterval);
}
if (maxConcurrentSteps != null) {
FlowProps.setMaxConcurrentSteps(props, maxConcurrentSteps);
}
HadoopFlow flow = (HadoopFlow) new HadoopFlowConnector(props).connect(def);
return flow;
}