Apache Phoenix-Hive Usage Examples

You can refer to the following Phoenix-Hive connector examples:

Creating a table
Loading data
Querying data

Creating a table

Creating an external Hive table requires an existing table in Phoenix. Hive manages only the Hive metadata. Dropping an external table from Hive deletes only the Hive metadata, but the Phoenix table is not deleted.

Use the create external table command to create an EXTERNAL Hive table.

create external table ext_table (
  i1 int,
  s1 string,
  f1 float,
  d1 decimal
)
STORED BY 'org.apache.phoenix.hive.PhoenixStorageHandler'
TBLPROPERTIES (
  "phoenix.table.name" = "ext_table",
  "phoenix.zookeeper.quorum" = "localhost",
  "phoenix.zookeeper.znode.parent" = "/hbase",
  "phoenix.zookeeper.client.port" = "2181",
  "phoenix.rowkeys" = "i1",
  "phoenix.column.mapping" = "i1:i1, s1:s1, f1:f1, d1:d1"
);

Following are the parameters that you could use when creating an external table:


Parameter	Default Value	Description
`phoenix.table.name`	The same name as the Hive table	Name of the existing Phoenix table
`phoenix.zookeeper.quorum`	localhost	Specifies the ZooKeeper quorum for HBase
`phoenix.zookeeper.znode.parent`	/hbase	Specifies the ZooKeeper parent node for HBase
`phoenix.zookeeper.client.port`	2181	Specifies the ZooKeeper port
`phoenix.rowkeys`	N/A	The list of columns to be the primary key in a Phoenix table
`phoenix.column.mapping`	N/A	Mappings between column names for Hive and Phoenix

Loading data

Use insert statement to load data to the Phoenix table through Hive.

insert into table T values (....);
insert into table T select c1,c2,c3 from source_table;

Querying data

You can use HiveQL for querying data in a Phoenix table. A Hive query on a single table can be as fast as running the query in the Phoenix CLI with the following property settings:

hive.fetch.task.conversion=more and hive.exec.parallel=true

Following are some of the parameters that you could use when querying the data:


Parameter	Default Value	Description
`hbase.scan.cache`	100	Read row size for a unit request
`hbase.scan.cacheblock`	false	Whether or not cache block
`split.by.stats`	false	If true, mappers use table statistics. One mapper per guide post.
`[hive-table-name].reducer.count`	1	Number of reducers. In Tez mode, this affects only single-table queries. See Limitations.
`[phoenix-table-name].query.hint`	N/A	Hint for Phoenix query (for example, NO_INDEX)