/// <exception cref="System.IO.IOException"/>
public virtual void Map(WritableComparable key, Writable value, OutputCollector <IntWritable
, SortValidator.RecordStatsChecker.RecordStatsWritable> output, Reporter reporter
)
{
// Set up rawKey and rawValue on the first call to 'map'
if (recordId == -1)
{
rawKey = CreateRaw(key.GetType());
rawValue = CreateRaw(value.GetType());
}
++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.GetType();
}
else
{
// Sanity check
if (keyClass != key.GetType())
{
throw new IOException("Type mismatch in key: expected " + keyClass.FullName + ", received "
+ key.GetType().FullName);
}
// 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 SortValidator.RecordStatsChecker.RecordStatsWritable
((keyBytesLen + valueBytesLen), 1, keyValueChecksum));
}
/// <summary>
/// Use (the specified slice of the array returned by)
/// <see cref="Org.Apache.Hadoop.IO.BinaryComparable.GetBytes()"/>
/// to partition.
/// </summary>
public override int GetPartition(BinaryComparable key, V value, int numPartitions
)
{
int length = key.GetLength();
int leftIndex = (leftOffset + length) % length;
int rightIndex = (rightOffset + length) % length;
int hash = WritableComparator.HashBytes(key.GetBytes(), leftIndex, rightIndex - leftIndex
+ 1);
return((hash & int.MaxValue) % numPartitions);
}
public override int GetHashCode()
{
return(WritableComparator.HashBytes(bytes, length));
}
public override int GetHashCode()
{
return(WritableComparator.HashBytes(identifier, identifier.Length));
}