12. How do I handle the exception displayed with a Tez Query while querying a JDBC table?¶
You would see the the following exception message when you are querying a JDBC table using Tez.
java.io.IOException: InputFormatWrapper can not support RecordReaders that don't return same key & value objects.
You get the exception as the JDBC Storage handler does not work when Input Splits Grouping is enabled in Hive-on-Tez.
HiveInputFormat is enabled by default in Tez to support Splits Grouping.
You can avoid the issue by setting the input format as
CombineHiveInputFormat using this command that disables the