Flink JanusGraph Connector

This project aims to use Flink to operate JanusGraph(Hbase Backend) simply and efficiently.

Using Map to store properties will be more flexible than the current connector.

How To Use

-- register a vertex table in FlinkSQL
CREATE TABLE t_jg_vertex (
    `id` ROW <`label` STRING, `ident` STRING>, -- identify a unique vertex
    `label` STRING,                 -- graph's label
    `value` STRING,                 -- graph's value property 
    `create_at` TIMESTAMP_LTZ(3),   -- graph's create_at property 
    `update_at` TIMESTAMP_LTZ(3)    -- graph's update_at property 
) WITH (
    'connector' = 'janusgraph',
    'hosts' = '0.0.0.0,0.0.0.0',
    'port' = '2181',
    'backend-type' = 'hbase',
    'table-name' = 'jg_table',
    'table-type' = 'vertex',
    'sink.flush-interval' = '10s',
    'sink.batch-size' = '2000',
    'sink.non-update-columns' = 'create_at,..',
    'sink.parallelism' = '2',
    ...
);

-- register a edge table in FlinkSQL
CREATE TABLE t_jg_edge (
    `id` ROW<label STRING,..>, -- id + in_v + out_v can identify a unique edge
    `in_v` ROW<label STRING,..>,
    `out_v` ROW<label STRING,..>,
    `label` STRING,
    `value` STRING,
) WITH (
    'connector' = 'janusgraph',
    'hosts' = '0.0.0.0,0.0.0.0',
    'port' = '2181',
    'backend-type' = 'hbase',
    'table-name' = 'jg_table',
    'table-type' = 'edge',
    ...
)

-- 1. id, label, in_v, out_v are internally defined columns.
-- 2. Type of id, in_v, out_v can be BIGINT or ROW.

Options

Option	Required	Default	Type	Description
connector	true	none	String	Specify which connector to use, here should be 'janusgraph'.
factory	false	org.janusgraph.core.JanusGraphFactory	String	The Factory for creating a JanusGraph instance, equal to JanusGraph config gremlin.graph
hosts	true	none	String	A comma-separated list of storage backend servers, equal to JanusGraph config storage.hostname.
port	true	none	Integer	The port on which to connect to storage backend servers, equal to JanusGraph config storage.port.
backend-type	false	hbase	String	Type of storage backend, currently only supports hbase.
table-name	true	none	String	The JanusGraph table name, currently equal to JanusGraph config storage.hbase.table.
table-type	true	none	String	The type of current table, available: vertex, edge.
username	false	none	String	Username to authenticate against storage backend, equal to JanusGraph config storage.username.
password	false	none	String	Password to authenticate against storage backend, equal to JanusGraph config storage.password.
sink.parallelism	false	none	Integer	Defines a custom parallelism for the sink.
sink.batch-size	false	1000	Integer	The max flush size, over this number of records, will flush data.
sink.flush-interval	false	1s	Integer	The flush interval mills, over this time, asynchronous threads will flush data.
sink.max-retries	false	3	Integer	The max retry times if writing records to JanusGraph failed.
sink.non-update-columns	false	none	String	A comma-separated list of columns that are not allowed to be updated.
properties.*	optional	none	String	This can set and pass JanusGraph configurations.

Data Type Mapping

Flink Type	JanusGraph Type
CHAR / VARCHAR / STRING	String
BOOLEAN	Boolean
BINARY / VARBINARY / BYTES	byte[]
TINYINT	Byte
SMALLINT	Short
INTEGER / INTERVAL_YEAR_MONTH	Integer
BIGINT / INTERVAL_DAY_TIME	Long
FLOAT	Float
DOUBLE	Double
DATE / TIME / TIMESTAMP / TIMESTAMP_LTZ	Date
ARRAY	Array
MAP	Map
ROW	Supported by columns of id, in_v, out_v
DECIMAL	Not supported
MULTISET	Not supported
RAW	Not supported