# tSchemaComplianceCheck MapReduce properties (deprecated)
Availability-note[Deprecated](https://help.talend.com/r/en-US/Cloud/labels-on-talend-help-center/availability-deprecated)
This content is deprecated.
These properties are used to configure tSchemaComplianceCheck running in the MapReduce Job framework.
The MapReduce tSchemaComplianceCheck component belongs to the Data Quality family.
The component in this framework is available in all Talend products with Big Data and Talend Data Fabric.
Availability-note[Deprecated](https://help.talend.com/r/en-US/Cloud/labels-on-talend-help-center/availability-deprecated)
This content is deprecated.
The MapReduce framework is deprecated from Talend 7.3 onwards. Use Talend Jobs for Apache Spark to accomplish your integration tasks.
## Basic settings
| Base Schema and Edit schema | A schema is a row description. It defines the number of fields
(columns) to be processed and passed on to the next component. When you create a Spark
Job, avoid the reserved word line when naming the
fields.
It describes the structure and nature of your data to be processed as
it is.
Built-In: You create and store the schema locally for this component
only.
Repository: You have already created the schema and stored it in the
Repository. You can reuse it in various projects and Job designs. |
| --- | --- |
| Check all columns from schema | Select this option to carry out all checks on all columns against
the base schema. |
| Custom defined | Select this option to carry out particular checks on particular
columns. When this option is selected, the Checked Columns table shows. |
| Checked Columns | In this table, define what checks are to be
carried out on which columns. This table appears when you select the
Custom defined option. |
| | Column: Displays the columns
names. |
| | Type: Select the type of data
each column is supposed to contain. This validation is mandatory for
all columns. |
| | Date pattern: Define the expected
date format for each column with the data type of
*Date*. |
| | Nullable: Select the check box in
an individual column to define the column to be nullable, that is,
to allow empty rows in this column to go to the output flow
regardless of the base schema definition. To define all columns to
be nullable, select the check box in the table header. |
| | Max length: Select the check box
in an individual column to verify the data length of the column
against the length definition of the base schema. To carry out this
verification on all the columns, select the check box in the table
header. |
| Use another schema for compliance check | Define a reference schema as you expect the data to be, in order
to reject the non-compliant data.
It can be restrictive on data type, null values, and/or
length. |
| Trim the excess content of column when length checking
chosen and the length is greater than defined length | With any of the three modes of tSchemaComplianceCheck, select this check box to
truncate the data that exceeds the length specified rather than
reject it.
Information noteNote:
This option is applicable only on data of String type. |
## Advanced settings
| Use Fastest Date Check | Select this check box to perform a fast date format check using
the *TalendDate.isDate()* method of the
*Talend Date* system routine if
*Date pattern* is not defined. For more
information about routines, see *Talend Studio User
Guide*. |
| --- | --- |
| Ignore TimeZone when Check Date | Select this check box to ignore the time zone setup upon date
check.
Not available when the Check all columns
from schema mode is selected. |
| Treat all empty string as NULL | Select this check box to treat any empty fields in any columns as
null values, instead of empty strings.
By default, this check box is selected. When it is cleared, the
Choose Column(s) table shows to
let you select individual columns. |
## Global Variables
| 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
| **Usage rule** | In a
Talend
Map/Reduce Job, this component is used as an intermediate
step and other components used along with it must be Map/Reduce components, too. They
generate native Map/Reduce code that can be executed directly in Hadoop.
It does not support data of the Object and the List
types.
For further information about a
Talend
Map/Reduce Job, see the sections
describing how to create, convert and configure a
Talend
Map/Reduce Job of the
**Talend Big Data Getting Started Guide**.
Note that in this documentation, unless otherwise
explicitly stated, a scenario presents only Standard Jobs,
that is to say traditional
Talend
data integration Jobs, and non Map/Reduce Jobs. |
| --- | --- |