Default retry policy | ScyllaDB Docs

Default retry policy¶

This is the retry policy used by default. It retries when there is a high chance that it might help.
This policy is based on the one in DataStax Java Driver. The behaviour is the same.

Examples¶

To use in Session:

use scylla::client::session::Session;
use scylla::client::session_builder::SessionBuilder;
use scylla::client::execution_profile::ExecutionProfile;
use scylla::policies::retry::DefaultRetryPolicy;

let handle = ExecutionProfile::builder()
    .retry_policy(Arc::new(DefaultRetryPolicy::new()))
    .build()
    .into_handle();

let session: Session = SessionBuilder::new()
    .known_node("127.0.0.1:9042")
    .default_execution_profile_handle(handle)
    .build()
    .await?;

To use in an unprepared statement:

use scylla::statement::unprepared::Statement;
use scylla::client::execution_profile::ExecutionProfile;
use scylla::policies::retry::DefaultRetryPolicy;

// Create a Statement manually and set the retry policy
let mut my_statement: Statement = Statement::new("INSERT INTO ks.tab (a) VALUES(?)");
my_statement.set_retry_policy(Some(Arc::new(DefaultRetryPolicy::new())));

// You can also set retry policy in an execution profile
let handle = ExecutionProfile::builder()
    .retry_policy(Arc::new(DefaultRetryPolicy::new()))
    .build()
    .into_handle();
my_statement.set_execution_profile_handle(Some(handle));

// Execute the statement using this retry policy
let to_insert: i32 = 12345;
session.query_unpaged(my_statement, (to_insert,)).await?;

To use in a prepared statement:

use scylla::statement::prepared::PreparedStatement;
use scylla::client::execution_profile::ExecutionProfile;
use scylla::policies::retry::DefaultRetryPolicy;

// Create PreparedStatement manually and set the retry policy
let mut prepared: PreparedStatement = session
    .prepare("INSERT INTO ks.tab (a) VALUES(?)")
    .await?;
prepared.set_retry_policy(Some(Arc::new(DefaultRetryPolicy::new())));

// You can also set retry policy in an execution profile
let handle = ExecutionProfile::builder()
    .retry_policy(Arc::new(DefaultRetryPolicy::new()))
    .build()
    .into_handle();
prepared.set_execution_profile_handle(Some(handle));

// Execute the statement using this retry policy
let to_insert: i32 = 12345;
session.execute_unpaged(&prepared, (to_insert,)).await?;

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