Mapping validation fails in the following situations:

The transformation contains stateful variable ports.
The transformation contains unsupported functions in an expression.

If an expression results in numerical errors, such as division by zero or SQRT of a negative number, it returns an infinite or an NaN value. In the native environment, the expression returns null values and the rows do not appear in the output.

The following restrictions apply to the Java transformation:

The value Transaction for transformation scope is not valid.
The transformation is always Stateless
The Partitionable field is ignored.

Mapping validation fails in the following situations:

Case sensitivity is disabled.

Use a Lookup transformation to look up data in a flat file, HDFS, Hive, or Sqoop.

Mapping validation fails in the following situations:

Case sensitivity is disabled.
The lookup is a data object.
The cache is configured to be shared, named, persistent, dynamic, or uncached. The cache must be a static cache.

The mapping fails in the following situations:

The transformation is unconnected.

You cannot use a float data type to look up data in a Hive table as comparing equality of floating point numbers is unsafe.

When you configure the transformation to return the first, last, or any value on multiple matches, the Data Integration Service returns any value.

To use a Lookup transformation on Sqoop in a Cloudera distribution, perform the following configuration:

In the Yarn configuration, locate the property

NodeManager Advanced Configuration Snippet (Safety Valve) for mapred-site.xml

Add the following xml snippet:

<property>
<name>mapreduce.application.classpath</name>
<value>$HADOOP_MAPRED_HOME/,$HADOOP_MAPRED_HOME/lib/,
$MR2_CLASSPATH</value>
</property>

Mapping validation fails in the following situations:

Case sensitivity is disabled.

The Data Integration Service logs a warning and ignores the Sorter transformation in the following situations:

There is a type mismatch in between the target and the Sorter transformation sort keys.
The transformation contains sort keys that are not connected to the target.
The transformation is not directly upstream from the Write transformation.

The Data Integration Service treats null values as high even if you configure the transformation to treat null values as low.

See the Window Transformation chapter in this guide for more information.