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To Hive

If the destination link of a job is the Link to Hive, configure the destination job parameters based on Table 1.

Table 1 Parameter description

Parameter

Description

Example Value

Database Name

Database name. Click the icon next to the text box. The dialog box for selecting the database is displayed.

default

Auto Table Creation
This parameter is displayed only when both the migration source and destination are relational databases. The options are as follows:
  • Non-auto creation: CDM will not automatically create a table.
  • Auto creation: If the destination database does not contain the table specified by Table Name, CDM will automatically create the table. If the table specified by Table Name already exists, no table is created and data is written to the existing table.
  • Deletion before creation: CDM deletes the table specified by Table Name, and then creates the table again.

Non-auto creation

Table Name

Destination table name.

Click the icon next to the text box. The dialog box for selecting the table is displayed.

This parameter can be configured as a macro variable of date and time and a path name can contain multiple macro variables. When the macro variable of date and time works with a scheduled job, the incremental data can be synchronized periodically. For details, see Incremental Synchronization Using the Macro Variables of Date and Time.

TBL_X

Clear Data Before Import
Whether the data in the destination table is cleared before data import. The options are as follows:
  • Yes: The data is cleared.
  • No: The data is not cleared. Instead, it will be added to the existing table.

Yes
  1. When Hive serves as the migration destination, the storage format selected during table creation will be automatically used, such as ORC and Parquet.
  2. When Hive serves as the migration destination, if the storage format is TEXTFILE, delimiters must be explicitly specified in the statement for creating Hive tables. The following gives an example: 
    CREATE TABLE csv_tbl(
smallint_value smallint,
tinyint_value tinyint,
int_value int,
bigint_value bigint,
float_value float,
double_value double,
decimal_value decimal(9, 7),
timestmamp_value timestamp,
date_value date,
varchar_value varchar(100),
string_value string,
char_value char(20),
boolean_value boolean,
binary_value binary,
varchar_null varchar(100),
string_null string,
char_null char(20),
int_null int
)
ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.OpenCSVSerde'
WITH SERDEPROPERTIES (
"separatorChar" = "\t",
"quoteChar"     = "'",
"escapeChar"    = "\\"
)
STORED AS TEXTFILE;