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Caution
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Execution profiles are a way to group various query execution configuration options together. Profiles can be created to represent different workloads, which can be run conveniently on a single session.
The settings that an execution profile encapsulates are as follows:
consistency
serial consistency
request timeout
load balancing policy
retry policy
speculative execution policy
There are two classes of objects related to execution profiles: ExecutionProfile
and ExecutionProfileHandle
. The former is simply an immutable set of the settings. The latter is a handle that at particular moment points to some ExecutionProfile
(but during its lifetime, it can change the profile it points at). Handles are assigned to Sessions
and Statements
.
At any moment, handles can be remapped to point to another ExecutionProfile
. This allows convenient switching between workloads for all Sessions
and/or Statements
that, for instance, share common characteristics.
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