Paimon

Paimon source connector

Description

Read data from Apache Paimon.

Key features

• batch
• stream
• exactly-once
• column projection
• parallelism
• support user-defined split

Options

name	type	required	default value
warehouse	String	Yes	-
catalog_type	String	No	filesystem
catalog_uri	String	No	-
database	String	Yes	-
table	String	Yes	-
hdfs_site_path	String	No	-
query	String	No	-
paimon.hadoop.conf	Map	No	-
paimon.hadoop.conf-path	String	No	-

warehouse [string]

Paimon warehouse path

catalog_type [string]

Catalog type of Paimon, support filesystem and hive

catalog_uri [string]

Catalog uri of Paimon, only needed when catalog_type is hive

database [string]

The database you want to access

table [string]

The table you want to access

hdfs_site_path [string]

The file path of hdfs-site.xml

query [string]

The filter condition of the table read. For example: select * from st_test where id > 100. If not specified, all rows are read. Currently, where conditions only support <, <=, >, >=, =, !=, or, and,is null, is not null, and others are not supported. The Having, Group By, Order By clauses are currently unsupported, because these clauses are not supported by Paimon. The projection and limit will be supported in the future.

Note: When the field after the where condition is a string or boolean value, its value must be enclosed in single quotes, otherwise an error will be reported. For example: name='abc' or tag='true' The field data types currently supported by where conditions are as follows:

• string
• boolean
• tinyint
• smallint
• int
• bigint
• float
• double
• date
• timestamp

paimon.hadoop.conf [string]

Properties in hadoop conf

paimon.hadoop.conf-path [string]

The specified loading path for the 'core-site.xml', 'hdfs-site.xml', 'hive-site.xml' files

Examples

Simple example

source {
 Paimon {
     warehouse = "/tmp/paimon"
     database = "default"
     table = "st_test"
   }
}

Filter example

source {
  Paimon {
    warehouse = "/tmp/paimon"
    database = "full_type"
    table = "st_test"
    query = "select c_boolean, c_tinyint from st_test where c_boolean= 'true' and c_tinyint > 116 and c_smallint = 15987 or c_decimal='2924137191386439303744.39292213'"
  }
}

Hadoop conf example

source {
  Paimon {
    catalog_name="seatunnel_test"
    warehouse="hdfs:///tmp/paimon"
    database="seatunnel_namespace1"
    table="st_test"
    query = "select * from st_test where pk_id is not null and pk_id < 3"
    paimon.hadoop.conf = {
      fs.defaultFS = "hdfs://nameservice1"
      dfs.nameservices = "nameservice1"
      dfs.ha.namenodes.nameservice1 = "nn1,nn2"
      dfs.namenode.rpc-address.nameservice1.nn1 = "hadoop03:8020"
      dfs.namenode.rpc-address.nameservice1.nn2 = "hadoop04:8020"
      dfs.client.failover.proxy.provider.nameservice1 = "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider"
      dfs.client.use.datanode.hostname = "true"
    }
  }
}

Hive catalog example

source {
  Paimon {
    catalog_name="seatunnel_test"
    catalog_type="hive"
    catalog_uri="thrift://hadoop04:9083"
    warehouse="hdfs:///tmp/seatunnel"
    database="seatunnel_test"
    table="st_test3"
    paimon.hadoop.conf = {
      fs.defaultFS = "hdfs://nameservice1"
      dfs.nameservices = "nameservice1"
      dfs.ha.namenodes.nameservice1 = "nn1,nn2"
      dfs.namenode.rpc-address.nameservice1.nn1 = "hadoop03:8020"
      dfs.namenode.rpc-address.nameservice1.nn2 = "hadoop04:8020"
      dfs.client.failover.proxy.provider.nameservice1 = "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider"
      dfs.client.use.datanode.hostname = "true"
    }
  }
}

Changelog

If you want to read the changelog of this connector, your sink table of paimon which mast has the options named changelog-producer=input, then you can refer to Paimon changelog. Currently, we only support the input and none mode of changelog producer. If the changelog producer is input, the streaming read of the connector will generate -U,+U,+I,+D data. But if the changelog producer is none, the streaming read of the connector will generate +I,+U,+D data.

Streaming read example

env {
  parallelism = 1
  job.mode = "Streaming"
}

source {
  Paimon {
    warehouse = "/tmp/paimon"
    database = "full_type"
    table = "st_test"
  }
}

sink {
  Paimon {
    warehouse = "/tmp/paimon"
    database = "full_type"
    table = "st_test_sink"
    paimon.table.primary-keys = "c_tinyint"
  }
}