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

Filesystems

The Paimon connector supports writing data to multiple file systems. Currently, the supported file systems are hdfs and s3. If you use the s3 filesystem. You can configure the fs.s3a.access-key、fs.s3a.secret-key、fs.s3a.endpoint、fs.s3a.path.style.access、fs.s3a.aws.credentials.provider properties in the paimon.hadoop.conf option. Besides, the warehouse should start with s3a://.

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'"
  }
}

S3 example

env {
  execution.parallelism = 1
  job.mode = "BATCH"
}

source {
  Paimon {
    warehouse = "s3a://test/"
    database = "seatunnel_namespace11"
    table = "st_test"
    paimon.hadoop.conf = {
        fs.s3a.access-key=G52pnxg67819khOZ9ezX
        fs.s3a.secret-key=SHJuAQqHsLrgZWikvMa3lJf5T0NfM5LMFliJh9HF
        fs.s3a.endpoint="http://minio4:9000"
        fs.s3a.path.style.access=true
        fs.s3a.aws.credentials.provider=org.apache.hadoop.fs.s3a.SimpleAWSCredentialsProvider
    }
  }
}

sink {
  Console{}
}

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 the Paimon table, first set the changelog-producer for the Paimon source table and then use the SeaTunnel stream task to read it.

Note

Currently, batch reads are always the latest snapshot read, so to read full changelog data, you need to use stream reads and start stream reads before writing data to the Piamon table, and to ensure order, the parallelism of the stream read task should be set to 1.

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"
  }
}