本文整理匯總了Java中org.apache.hadoop.io.WritableComparable.getClass方法的典型用法代碼示例。如果您正苦於以下問題：Java WritableComparable.getClass方法的具體用法？Java WritableComparable.getClass怎麽用？Java WritableComparable.getClass使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類org.apache.hadoop.io.WritableComparable的用法示例。
在下文中一共展示了WritableComparable.getClass方法的1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: map
import org.apache.hadoop.io.WritableComparable; //導入方法依賴的package包/類
@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() + ", received " +
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)
);
}