tELTHiveInput – Docs for ESB 5.x

Component family

ELT/Map/Hive

Function

This component provides, for the tELTHiveMap component that follows, the input schema
of the Hive table to be used.

Purpose

This component helps to replicate the schema, which the tELTHiveMap component that follows will
use, of the input Hive table.

 Basic settings

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 name of the input table to be used.

Default schema name

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

 Advanced settings

tStat Catcher 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.