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English
  • Data Engineering Streaming 10.2.2
  • All Products

Table of Contents

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  1. Preface
  2. Introduction to Big Data Streaming
  3. Big Data Streaming Administration
  4. Sources in a Streaming Mapping
  5. Targets in a Streaming Mapping
  6. Streaming Mappings
  7. Window Transformation
  8. Connections
  9. Sample Files

User Guide

User Guide

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Lookup Transformation in a Streaming Mapping

Streaming mappings have additional processing rules that do not apply to batch mappings.

Mapping Validation

Mapping validation fails in the following situations:
  • The lookup is a data object.
  • An Aggregator transformation is in the same streaming pipeline as a passive Lookup transformation configured with an inequality lookup condition.
  • A Rank transformation is in the same streaming pipeline as a passive Lookup transformation configured with an inequality lookup condition.
  • A pipeline contains more than one passive Lookup transformation configured with an inequality condition.
The mapping fails in the following situations:
  • The transformation is unconnected.

General Guidelines

Consider the following general guidelines:
  • Using a float data type to look up data can return unexpected results.
  • Use a Lookup transformation to look up data in a flat file, HDFS, Hive, relational, and HBase data.
  • To avoid cross join of DataFrames, configure the Lookup transformation to ignore null values that match.

HBase Lookups

To use a Lookup transformation on uncached HBase tables, perform the following steps:
  1. Create an HBase data object. When you add an HBase table as the resource for a HBase data object, include the ROW ID column.
  2. Create a HBase read data operation and import it into the streaming mapping.
  3. When you import the data operation to the mapping, select the
    Lookup
     option.
  4. On the Lookup tab, configure the following options:
    • Lookup column. Specify an equality condition on ROW ID
    • Operator. Specify =
  5. Verify that format for any date value in the HBase tables is of a valid Java date format. Specify this format in the
    Date Time Format
     property of the
    Advanced Properties
     tab of the data object read operation.
If an HBase lookup does not result in a match, it generates a row with null values for all columns. You can add a Filter transformation after the Lookup transformation to filter out null rows.
Mapping validation fails in the following situations:
  • The condition does not contain a ROW ID.
  • The transformation contains an inequality condition.
  • The transformation contains multiple conditions.
  • An input column is of a date type.
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