Background

Follows on from:

• Example user jar for iterators #4133

Description

We'd like a system test that uses an iterator held in a user jar during ingest, query and compaction.

Analysis

We can upload the user jar as part of the deployment of a test Sleeper instance in DeployedSleeperInstances.firstConnectInstance, and set it in the user jars property at that point.

We could add user jars as an option in SystemTestInstanceConfiguration, so that they're only configured against an instance that will use it.

The actual upload of the user jar will be done already as long as it's in the local jars directory, as SyncJars just makes the jars bucket match the jars directory.

Ingest and compaction both apply the table iterator, while query applies both the table iterator, and an iterator specified in the query. We can test all of these cases.