Paimon Catalog

Instructions for use

1. When data in hdfs,need to put core-site.xml, hdfs-site.xml and hive-site.xml in the conf directory of FE and BE. First read the hadoop configuration file in the conf directory, and then read the related to the environment variable HADOOP_CONF_DIR configuration file.
2. The currently adapted version of the Paimon is 0.7.

Create Catalog

Paimon Catalog Currently supports two types of Metastore creation catalogs:

• filesystem(default),Store both metadata and data in the file system.
• hive metastore,It also stores metadata in Hive metastore. Users can access these tables directly from Hive.

Creating a Catalog Based on FileSystem

HDFS

CREATE CATALOG `paimon_hdfs` PROPERTIES (
    "type" = "paimon",
    "warehouse" = "hdfs://HDFS8000871/user/paimon",
    "dfs.nameservices" = "HDFS8000871",
    "dfs.ha.namenodes.HDFS8000871" = "nn1,nn2",
    "dfs.namenode.rpc-address.HDFS8000871.nn1" = "172.21.0.1:4007",
    "dfs.namenode.rpc-address.HDFS8000871.nn2" = "172.21.0.2:4007",
    "dfs.client.failover.proxy.provider.HDFS8000871" = "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider",
    "hadoop.username" = "hadoop"
);

MINIO

Note that.

user need download paimon-s3-0.6.0-incubating.jar

Place it in directory ${DORIS_HOME}/be/lib/java_extensions/preload-extensions and restart be

Starting from version 2.0.2, this file can be placed in BE's custom_lib/ directory (if it does not exist, just create it manually) to prevent the file from being lost due to the replacement of the lib directory when upgrading the cluster.

CREATE CATALOG `paimon_s3` PROPERTIES (
    "type" = "paimon",
    "warehouse" = "s3://bucket_name/paimons3",
    "s3.endpoint" = "http://<ip>:<port>",
    "s3.access_key" = "ak",
    "s3.secret_key" = "sk"
);

OBS

Note that.

user need download paimon-s3-0.6.0-incubating.jar

Place it in directory ${DORIS_HOME}/be/lib/java_extensions/preload-extensions and restart be

Starting from version 2.0.2, this file can be placed in BE's custom_lib/ directory (if it does not exist, just create it manually) to prevent the file from being lost due to the replacement of the lib directory when upgrading the cluster.

CREATE CATALOG `paimon_obs` PROPERTIES (
    "type" = "paimon",
    "warehouse" = "obs://bucket_name/paimon",
    "obs.endpoint"="obs.cn-north-4.myhuaweicloud.com",
    "obs.access_key"="ak",
    "obs.secret_key"="sk"
);

COS

CREATE CATALOG `paimon_cos` PROPERTIES (
    "type" = "paimon",
    "warehouse" = "cosn://paimon-1308700295/paimoncos",
    "cos.endpoint" = "cos.ap-beijing.myqcloud.com",
    "cos.access_key" = "ak",
    "cos.secret_key" = "sk"
);

OSS

CREATE CATALOG `paimon_oss` PROPERTIES (
    "type" = "paimon",
    "warehouse" = "oss://paimon-zd/paimonoss",
    "oss.endpoint" = "oss-cn-beijing.aliyuncs.com",
    "oss.access_key" = "ak",
    "oss.secret_key" = "sk"
);

Creating a Catalog Based on Hive Metastore

CREATE CATALOG `paimon_hms` PROPERTIES (
    "type" = "paimon",
    "paimon.catalog.type" = "hms",
    "warehouse" = "hdfs://HDFS8000871/user/zhangdong/paimon2",
    "hive.metastore.uris" = "thrift://172.21.0.44:7004",
    "dfs.nameservices" = "HDFS8000871",
    "dfs.ha.namenodes.HDFS8000871" = "nn1,nn2",
    "dfs.namenode.rpc-address.HDFS8000871.nn1" = "172.21.0.1:4007",
    "dfs.namenode.rpc-address.HDFS8000871.nn2" = "172.21.0.2:4007",
    "dfs.client.failover.proxy.provider.HDFS8000871" = "org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider",
    "hadoop.username" = "hadoop"
);

Column Type Mapping

Paimon Data Type	Doris Data Type	Comment
BooleanType	Boolean
TinyIntType	TinyInt
SmallIntType	SmallInt
IntType	Int
FloatType	Float
BigIntType	BigInt
DoubleType	Double
VarCharType	VarChar
CharType	Char
VarBinaryType, BinaryType	Binary
DecimalType(precision, scale)	Decimal(precision, scale)
TimestampType,LocalZonedTimestampType	DateTime
DateType	Date
ArrayType	Array	Support Array nesting
MapType	Map	Support Map nesting
RowType	Struct	Support Struct nesting (since 2.0.10 & 2.1.3)

FAQ

1. Kerberos

   • Make sure principal and keytab are correct.
   • You need to start a scheduled task (such as crontab) on the BE node, and execute the kinit -kt your_principal your_keytab command every certain time (such as 12 hours).

2. Unknown type value: UNSUPPORTED

   This is a compatible issue exist in 2.0.2 with Paimon 0.5, you need to upgrade to 2.0.3 or higher to solve this problem. Or patch yourself.

3. When accessing object storage (OSS, S3, etc.), encounter "file system does not support".

   In versions before 2.0.5 (inclusive), users need to manually download the following jar package and place it in the ${DORIS_HOME}/be/lib/java_extensions/preload-extensions directory, and restart BE.

   • OSS: paimon-oss-0.6.0-incubating.jar
   • Other Object Storage: paimon-s3-0.6.0-incubating.jar

   No need to download these jars since 2.0.6.