org.apache.hudi.io.hfile

Class HFileUtils

java.lang.Object

org.apache.hudi.io.hfile.HFileUtils

public class HFileUtils
extends Object

Util methods for reading and writing HFile.

Constructor Summary

Constructors

Constructor and Description
HFileUtils()

Method Summary

Modifier and Type	Method and Description
static int	compareKeys(Key key1, Key key2) Compares two HFile Key.
static CompressionCodec	decodeCompressionCodec(int id) Gets the compression codec based on the ID.
static String	getValue(KeyValue kv) Gets the value in String.
static boolean	isPrefixOfKey(Key prefix, Key key)
static int	readMajorVersion(byte[] bytes, int offset) Reads the HFile major version from the input.

Methods inherited from class java.lang.Object

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

Constructor Detail

HFileUtils

public HFileUtils()

Method Detail

decodeCompressionCodec

public static CompressionCodec decodeCompressionCodec(int id)

Gets the compression codec based on the ID. This ID is written to the HFile on storage.

Parameters:

id - ID indicating the compression codec.

Returns:

compression codec based on the ID.

readMajorVersion

public static int readMajorVersion(byte[] bytes,
                                   int offset)

Reads the HFile major version from the input.

Parameters:

bytes - input data.

offset - offset to start reading.

Returns:

major version of the file.

compareKeys

public static int compareKeys(Key key1,
                              Key key2)

Compares two HFile Key.

Parameters:

key1 - left operand key.

key2 - right operand key.

Returns:

0 if equal, < 0 if left is less than right, > 0 otherwise.

isPrefixOfKey

public static boolean isPrefixOfKey(Key prefix,
                                    Key key)

Parameters:

prefix - the prefix to check

key - key to check

Returns:

whether the key starts with the prefix.

getValue

public static String getValue(KeyValue kv)

Gets the value in String.

Parameters:

kv - KeyValue instance.

Returns:

the String with UTF-8 decoding.