Ballista: Make shuffle partitions configurable in benchmarks #702
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Which issue does this PR close?
Closes #701
Rationale for this change
We shouldn't hard-code configuration settings. User should be able to specify configuration.
What changes are included in this PR?
This introduces a configuration mechanism for a Ballista context based on key-value pairs that can be sent over protobuf to the scheduler. There is one configuration option supported so far, for default number of shuffle partitions.
Are there any user-facing changes?
Yes. The API for creating a Ballista context has changed.