本文整理匯總了Java中org.apache.hadoop.mapred.Reporter.NULL屬性的典型用法代碼示例。如果您正苦於以下問題：Java Reporter.NULL屬性的具體用法？Java Reporter.NULL怎麽用？Java Reporter.NULL使用的例子？那麽, 這裏精選的屬性代碼示例或許可以為您提供幫助。您也可以進一步了解該屬性所在類org.apache.hadoop.mapred.Reporter的用法示例。
在下文中一共展示了Reporter.NULL屬性的3個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Java代碼示例。
示例1: combineAndSpill
private void combineAndSpill(
RawKeyValueIterator kvIter,
Counters.Counter inCounter) throws IOException {
JobConf job = jobConf;
Reducer combiner = ReflectionUtils.newInstance(combinerClass, job);
Class<K> keyClass = (Class<K>) job.getMapOutputKeyClass();
Class<V> valClass = (Class<V>) job.getMapOutputValueClass();
RawComparator<K> comparator =
(RawComparator<K>)job.getCombinerKeyGroupingComparator();
try {
CombineValuesIterator values = new CombineValuesIterator(
kvIter, comparator, keyClass, valClass, job, Reporter.NULL,
inCounter);
while (values.more()) {
combiner.reduce(values.getKey(), values, combineCollector,
Reporter.NULL);
values.nextKey();
}
} finally {
combiner.close();
}
}
示例2: reduce
public void reduce(K key, Iterator<V> values, OutputCollector<K, V> output,
Reporter reporter) throws IOException {
if (Reporter.NULL == reporter) {
Assert.fail("A valid Reporter should have been used but, Reporter.NULL is used");
}
}
示例3: waitOutputThreads
void waitOutputThreads() throws IOException {
try {
if (outThread_ == null) {
// This happens only when reducer has empty input(So reduce() is not
// called at all in this task). If reducer still generates output,
// which is very uncommon and we may not have to support this case.
// So we don't write this output to HDFS, but we consume/collect
// this output just to avoid reducer hanging forever.
OutputCollector collector = new OutputCollector() {
public void collect(Object key, Object value)
throws IOException {
//just consume it, no need to write the record anywhere
}
};
Reporter reporter = Reporter.NULL;//dummy reporter
startOutputThreads(collector, reporter);
}
int exitVal = sim.waitFor();
// how'd it go?
if (exitVal != 0) {
if (nonZeroExitIsFailure_) {
throw new RuntimeException("PipeMapRed.waitOutputThreads(): subprocess failed with code "
+ exitVal);
} else {
LOG.info("PipeMapRed.waitOutputThreads(): subprocess exited with " +
"code " + exitVal + " in " + PipeMapRed.class.getName());
}
}
if (outThread_ != null) {
outThread_.join(joinDelay_);
}
if (errThread_ != null) {
errThread_.join(joinDelay_);
}
if (outerrThreadsThrowable != null) {
throw new RuntimeException(outerrThreadsThrowable);
}
} catch (InterruptedException e) {
//ignore
}
}