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Simple speculative execution¶
The easiest speculative execution policy available. It starts another
execution of a query after constant delay of retry_interval and does at most
max_retry_count speculative query executions (not counting the first,
non-speculative one).
Example¶
To use this policy in Session:
use std::{sync::Arc, time::Duration};
use scylla::client::session::Session;
use scylla::client::session_builder::SessionBuilder;
use scylla::{
policies::speculative_execution::SimpleSpeculativeExecutionPolicy,
client::execution_profile::ExecutionProfile,
};
let policy = SimpleSpeculativeExecutionPolicy {
max_retry_count: 3,
retry_interval: Duration::from_millis(100),
};
let handle = ExecutionProfile::builder()
.speculative_execution_policy(Some(Arc::new(policy)))
.build()
.into_handle();
let session: Session = SessionBuilder::new()
.known_node("127.0.0.1:9042")
.default_execution_profile_handle(handle)
.build()
.await?;