Specialized error streams capture errors and report on the records that caused
them.
Error streams can assist in debugging errors during development. It a production
environment, they can provide real-time monitoring for your projects.
Error streams are identical to other user-defined streams with two key exceptions:
- An error stream receives records from its source stream or window
only when there is an error on the source stream or window. The record it
receives is the input to the source stream or window that caused the error.
- An error stream has a predefined schema that cannot be modified.
See Advanced CCL Programming Techniques > Error Streams in the CCL
Programmers Guide.