Type	Description
BOOLEAN	Represents a boolean value in a byte. Values 0 and 1 are used to represent false and true respectively. When reading a boolean value, any non-zero value is considered true.
INT8	Represents an integer between -27 and 27-1 inclusive.
INT16	Represents an integer between -215 and 215-1 inclusive. The values are encoded using two bytes in network byte order (big-endian).
INT32	Represents an integer between -231 and 231-1 inclusive. The values are encoded using four bytes in network byte order (big-endian).
INT64	Represents an integer between -263 and 263-1 inclusive. The values are encoded using eight bytes in network byte order (big-endian).
UINT32	Represents an integer between 0 and 232-1 inclusive. The values are encoded using four bytes in network byte order (big-endian).
VARINT	Represents an integer between -231 and 231-1 inclusive. Encoding follows the variable-length zig-zag encoding from Google Protocol Buffers.
VARLONG	Represents an integer between -263 and 263-1 inclusive. Encoding follows the variable-length zig-zag encoding from Google Protocol Buffers.
STRING	Represents a sequence of characters. First the length N is given as an INT16. Then N bytes follow which are the UTF-8 encoding of the character sequence. Length must not be negative.
NULLABLE_STRING	Represents a sequence of characters or null. For non-null strings, first the length N is given as an INT16. Then N bytes follow which are the UTF-8 encoding of the character sequence. A null value is encoded with length of -1 and there are no following bytes.
BYTES	Represents a raw sequence of bytes. First the length N is given as an INT32. Then N bytes follow.
NULLABLE_BYTES	Represents a raw sequence of bytes or null. For non-null values, first the length N is given as an INT32. Then N bytes follow. A null value is encoded with length of -1 and there are no following bytes.
RECORDS	Represents a sequence of Kafka records as NULLABLE_BYTES. For a detailed description of records see Message Sets.
ARRAY	Represents a sequence of objects of a given type T. Type T can be either a primitive type (e.g. STRING) or a structure. First, the length N is given as an INT32. Then N instances of type T follow. A null array is represented with a length of -1. In protocol documentation an array of T instances is referred to as [T].