Mapping missing for cassandra TimeUUIDType which is Primary Key in our case too.

create column family tc_audit_trail

    with key_validation_class = TimeUUIDType

     and comparator = UTF8Type

     and column_metadata = [

       	{column_name: userid, validation_class: LongType,index_name : 'user', index_type : 0},

       	{column_name: entityid, validation_class: LongType,index_name : 'entity', index_type : 0},

       	{column_name: entitytype, validation_class: UTF8Type,index_name : 'entityType', index_type : 0},

	{column_name: logtype, validation_class: UTF8Type,index_name : 'logType', index_type : 0},

	{column_name: comment, validation_class: UTF8Type}

     ];

CREATE TABLE tc_audit_trail (

	`key` bigint(6) DEFAULT 0 NOT NULL,

	userid bigint(19),

	entityid bigint(19),

	entitytype varchar(60),

	logtype varchar(60),

	comment text(65535),

	PRIMARY KEY (`key`)

) ENGINE=CASSANDRA DEFAULT `thrift_host`='127.0.0.1' `keyspace`='timescity' `column_family`='tc_audit_trail'

error: ERROR: Internal error: Failed to map PRIMARY KEY to 

datatype org.apache.cassandra.db.marshal.TimeUUIDType Error 

Code: 1815