org.apache.hadoop.hive.common.histogram.kll

Class KllUtils

java.lang.Object

org.apache.hadoop.hive.common.histogram.kll.KllUtils

public class KllUtils
extends Object

KLL serialization utilities.

Method Summary

Modifier and Type	Method and Description
static org.apache.datasketches.kll.KllFloatsSketch	deserializeKll(byte[] buf) This function deserializes the serialized KLL sketch from a byte array.
static org.apache.datasketches.kll.KllFloatsSketch	deserializeKll(byte[] buf, int start, int len) This function deserializes the serialized KLL sketch from a byte array.
static org.apache.datasketches.kll.KllFloatsSketch	deserializeKll(InputStream in) This function deserializes the serialized KLL sketch from a stream.
static int	lengthFor(JavaDataModel model, org.apache.datasketches.kll.KllFloatsSketch kll) Returns the length of the given KLL sketch according to the given java data model.
static void	serializeKll(OutputStream out, org.apache.datasketches.kll.KllFloatsSketch kll) KLL is serialized according to what provided by data-sketches library

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

serializeKll

public static void serializeKll(OutputStream out,
                                org.apache.datasketches.kll.KllFloatsSketch kll)
                         throws IOException

KLL is serialized according to what provided by data-sketches library

Parameters:

out - output stream to write to

kll - KLL sketch that needs to be serialized

Throws:

IOException - if an error occurs during serialization

deserializeKll

public static org.apache.datasketches.kll.KllFloatsSketch deserializeKll(InputStream in)
                                                                  throws IOException

This function deserializes the serialized KLL sketch from a stream.

Parameters:

in - input stream to be deserialized

Returns:

KLL sketch

Throws:

IOException - if errors occur while reading the stream

deserializeKll

public static org.apache.datasketches.kll.KllFloatsSketch deserializeKll(byte[] buf,
                                                                         int start,
                                                                         int len)

This function deserializes the serialized KLL sketch from a byte array.

Parameters:

buf - to deserialize

start - start index for deserialization

len - start+len is deserialized

Returns:

KLL sketch

deserializeKll

public static org.apache.datasketches.kll.KllFloatsSketch deserializeKll(byte[] buf)

This function deserializes the serialized KLL sketch from a byte array.

Parameters:

buf - to deserialize

Returns:

KLL sketch

lengthFor

public static int lengthFor(JavaDataModel model,
                            org.apache.datasketches.kll.KllFloatsSketch kll)

Returns the length of the given KLL sketch according to the given java data model.

Parameters:

model - the java data model to compute the length

kll - the KLL sketch to compute the length for

Returns:

the length of the given KLL sketch according to the given java data model