The VSR algorithm takes a set of records as input and groups similar encountered duplicates together according to defined match rules. It compares pairs of records and assigns them to groups. The first processed record of each group is the master record of the group. So, the order of the records is important and can have an impact on the creation process of the master records.
The VSR algorithm compares each record with the master of each group and uses the computed distances, from master records, to decide to what group the record should go.
In the match analysis and matching components, the matching results of the VSR algorithm may vary depending on the order of the input records. If possible, put the records in which you have more confidence first in the input flow, to have better algorithm accuracy.
Note that matching components, including the Hadoop matching components, run only with rules configured with the VSR algorithm.
You can import and test the rule on your data in the match analysis editor. For further information, see Importing or exporting match rules.
You can also import the rule in the tMatchGroup configuration wizard and in other match components, including the Hadoop components, and use the rule in match Jobs. For further information, see the tMatchGroup documentation in the Talend Components Reference Guide.