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Batch Jobs

What can you observe?

A batch job consists of a large number of grouped operations on different data. The batch items may be split apart and processed one at a time, in serial or parallel. Observing a batch implies understanding both the individual processing of each item, and the batch-wide throughput. In a batch job, individual items are often processed by service calls; see our section on Service Calls for the pattern for processing single requests.

A batch job itself can be seen as one big Service Call request, as it usually starts with an invocation. Therefore, start with the section on Service Calls; this section only adds.

Questions that might want to be asked of a batch job might include:

What is the top of the stack?

The endpoint that starts the batch should be seen as the service entry.

What is the unit of work?

The batch as a whole. (In addition, the items within the batch should be instrumented as services)

What context is useful to capture?

In addition to the aspects in the Service Calls section:

What comes next?

Instrument the processor for individual items that may be of interest to you and your team.