tELTHiveOutput – Docs for ESB 5.x

Component family

ELT/Map/Hive

Function

This component executes the query built by the preceding tELTHiveMap component to write data into
the specified Hive table.

Purpose

This component works alongside tELTHiveMap to write data into the Hive
table.

 Basic settings

Action on data

Select the action to be performed on the data to be written in the Hive table.

With the Insert option, the data to be written in the
Hive table will be appended to the existing data if there is any.

Schema

A schema is a row description. It defines the number of fields to
be processed and passed on to the next component. The schema is
either Built-in or stored remotely
in the Repository.

Built-In: You create and store the schema locally for this
component only. Related topic: see Talend Studio
User Guide.

Repository: You have already created the schema and
stored it in the Repository. You can reuse it in various projects and Job designs. Related
topic: see Talend Studio User Guide.

Since version 5.6, both the Built-In mode and the Repository mode are
available in any of the Talend solutions.

Edit schema

Click Edit schema to make changes to the schema. If the
current schema is of the Repository type, three options are
available:

Default table name

Enter the default name of the output table you want to write data
in.

Default schema name

Enter the name of the default database schema to which the output
table to be used is related to.

Use different table name

Select this check box to define a different output table name,
between double quotation marks, in the Table
name field that appears.

If this table is related to a different database schema from the
default one, you also need to enter the name of that database
schema. The syntax is schema_name.table_name.

The target table uses the Parquet
format

If the table in which you need to write data is a Parquet table, select this check box.

Then from the Compression list that appears, select the
compression mode you need to use to handle the Parquet file. The default mode is Uncompressed.

Field Partition

In Partition Column, enter the
name, without any quotation marks, of the partition column of the
Hive table you want to write data in.

In Partition Value, enter the
value you want to use, in single quotation marks, for its
corresponding partition column.

 Advanced settings

tStatCatcher Statistics

Select this check box to collect log data at the component
level.

Global Variables

ERROR_MESSAGE: the error message generated by the
component when an error occurs. This is an After variable and it returns a string. This
variable functions only if the Die on error check box is
cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable
functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl +
Space to access the variable list and choose the variable to use from it.

For further information about variables, see Talend Studio
User Guide.

Usage

tELTHiveMap is used along with a
tELTHiveInput and tELTHiveOutput. Note that the Output link
to be used with these components must correspond strictly to the
syntax of the table name.

If the Studio used to connect to a Hive database is operated on Windows, you must manually
create a folder called tmp in the root of the disk where
this Studio is installed.