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hbase_utils.py
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from typing import List
from happybase import Connection
from feast.infra.key_encoding_utils import serialize_entity_key
from feast.protos.feast.types.EntityKey_pb2 import EntityKey
class HbaseConstants:
"""Constants to be used by the Hbase Online Store."""
DEFAULT_COLUMN_FAMILY = "default"
EVENT_TS = "event_ts"
CREATED_TS = "created_ts"
DEFAULT_EVENT_TS = DEFAULT_COLUMN_FAMILY + ":" + EVENT_TS
DEFAULT_CREATED_TS = DEFAULT_COLUMN_FAMILY + ":" + CREATED_TS
@staticmethod
def get_feature_from_col(col):
"""Given the column name, exclude the column family to get the feature name."""
return col.decode("utf-8").split(":")[1]
@staticmethod
def get_col_from_feature(feature):
"""Given the feature name, add the column family to get the column name."""
if isinstance(feature, bytes):
feature = feature.decode("utf-8")
return HbaseConstants.DEFAULT_COLUMN_FAMILY + ":" + feature
class HbaseUtils:
"""
Utils class to manage different Hbase operations.
Attributes:
conn: happybase Connection to connect to hbase.
host: hostname of the hbase thrift server.
port: port in which thrift server is running.
timeout: socket timeout in milliseconds.
"""
def __init__(
self, conn: Connection = None, host: str = None, port: int = None, timeout=None
):
if conn is None:
self.host = host
self.port = port
self.conn = Connection(host=host, port=port, timeout=timeout)
else:
self.conn = conn
def create_table(self, table_name: str, colm_family: List[str]):
"""
Create table in hbase online store.
Arguments:
table_name: Name of the Hbase table.
colm_family: List of names of column families to be created in the hbase table.
"""
cf_dict: dict = {}
for cf in colm_family:
cf_dict[cf] = dict()
return self.conn.create_table(table_name, cf_dict)
def create_table_with_default_cf(self, table_name: str):
"""
Create table in hbase online store with one column family "default".
Arguments:
table_name: Name of the Hbase table.
"""
return self.conn.create_table(table_name, {"default": dict()})
def check_if_table_exist(self, table_name: str):
"""
Check if table exists in hbase.
Arguments:
table_name: Name of the Hbase table.
"""
return bytes(table_name, "utf-8") in self.conn.tables()
def batch(self, table_name: str):
"""
Returns a 'Batch' instance that can be used for mass data manipulation in the hbase table.
Arguments:
table_name: Name of the Hbase table.
"""
return self.conn.table(table_name).batch()
def put(self, table_name: str, row_key: str, data: dict):
"""
Store data in the hbase table.
Arguments:
table_name: Name of the Hbase table.
row_key: Row key of the row to be inserted to hbase table.
data: Mapping of column family name:column name to column values
"""
table = self.conn.table(table_name)
table.put(row_key, data)
def row(
self,
table_name: str,
row_key,
columns=None,
timestamp=None,
include_timestamp=False,
):
"""
Fetch a row of data from the hbase table.
Arguments:
table_name: Name of the Hbase table.
row_key: Row key of the row to be inserted to hbase table.
columns: the name of columns that needs to be fetched.
timestamp: timestamp specifies the maximum version the cells can have.
include_timestamp: specifies if (column, timestamp) to be return instead of only column.
"""
table = self.conn.table(table_name)
return table.row(row_key, columns, timestamp, include_timestamp)
def rows(
self,
table_name: str,
row_keys,
columns=None,
timestamp=None,
include_timestamp=False,
):
"""
Fetch multiple rows of data from the hbase table.
Arguments:
table_name: Name of the Hbase table.
row_keys: List of row key of the row to be inserted to hbase table.
columns: the name of columns that needs to be fetched.
timestamp: timestamp specifies the maximum version the cells can have.
include_timestamp: specifies if (column, timestamp) to be return instead of only column.
"""
table = self.conn.table(table_name)
return table.rows(row_keys, columns, timestamp, include_timestamp)
def print_table(self, table_name):
"""Prints the table scanning all the rows of the hbase table."""
table = self.conn.table(table_name)
scan_data = table.scan()
for row_key, cols in scan_data:
print(row_key.decode("utf-8"), cols)
def delete_table(self, table: str):
"""Deletes the hbase table given the table name."""
if self.check_if_table_exist(table):
self.conn.delete_table(table, disable=True)
def close_conn(self):
"""Closes the happybase connection."""
self.conn.close()
def main():
from feast.protos.feast.types.Value_pb2 import Value
connection = Connection(host="localhost", port=9090)
table = connection.table("test_hbase_driver_hourly_stats")
row_keys = [
serialize_entity_key(
EntityKey(join_keys=["driver_id"], entity_values=[Value(int64_val=1004)]),
entity_key_serialization_version=2,
).hex(),
serialize_entity_key(
EntityKey(join_keys=["driver_id"], entity_values=[Value(int64_val=1005)]),
entity_key_serialization_version=2,
).hex(),
serialize_entity_key(
EntityKey(join_keys=["driver_id"], entity_values=[Value(int64_val=1024)]),
entity_key_serialization_version=2,
).hex(),
]
rows = table.rows(row_keys)
for row_key, row in rows:
for key, value in row.items():
col_name = bytes.decode(key, "utf-8").split(":")[1]
print(col_name, value)
print()
if __name__ == "__main__":
main()