diff --git a/src/raw/client.rs b/src/raw/client.rs
index 6f140ad7..da67c56a 100644
--- a/src/raw/client.rs
+++ b/src/raw/client.rs
@@ -188,10 +188,15 @@ impl<PdC: PdClient> Client<PdC> {
     /// # });
     /// ```
     pub async fn get(&self, key: impl Into<Key>) -> Result<Option<Value>> {
+        self.get_opt(key, DEFAULT_REGION_BACKOFF).await
+    }
+
+    /// Same as [`get`](Client::get) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn get_opt(&self, key: impl Into<Key>, backoff: Backoff) -> Result<Option<Value>> {
         debug!(self.logger, "invoking raw get request");
         let request = new_raw_get_request(key.into(), self.cf.clone());
         let plan = crate::request::PlanBuilder::new(self.rpc.clone(), request)
-            .retry_multi_region(DEFAULT_REGION_BACKOFF)
+            .retry_multi_region(backoff)
             .merge(CollectSingle)
             .post_process_default()
             .plan();
@@ -219,11 +224,20 @@ impl<PdC: PdClient> Client<PdC> {
     pub async fn batch_get(
         &self,
         keys: impl IntoIterator<Item = impl Into<Key>>,
+    ) -> Result<Vec<KvPair>> {
+        self.batch_get_opt(keys, DEFAULT_REGION_BACKOFF).await
+    }
+
+    /// Same as [`batch_get`](Client::batch_get) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn batch_get_opt(
+        &self,
+        keys: impl IntoIterator<Item = impl Into<Key>>,
+        backoff: Backoff,
     ) -> Result<Vec<KvPair>> {
         debug!(self.logger, "invoking raw batch_get request");
         let request = new_raw_batch_get_request(keys.into_iter().map(Into::into), self.cf.clone());
         let plan = crate::request::PlanBuilder::new(self.rpc.clone(), request)
-            .retry_multi_region(DEFAULT_REGION_BACKOFF)
+            .retry_multi_region(backoff)
             .merge(Collect)
             .plan();
         plan.execute()
@@ -248,10 +262,20 @@ impl<PdC: PdClient> Client<PdC> {
     /// # });
     /// ```
     pub async fn put(&self, key: impl Into<Key>, value: impl Into<Value>) -> Result<()> {
+        self.put_opt(key, value, DEFAULT_REGION_BACKOFF).await
+    }
+
+    /// Same as [`put`](Client::put) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn put_opt(
+        &self,
+        key: impl Into<Key>,
+        value: impl Into<Value>,
+        backoff: Backoff,
+    ) -> Result<()> {
         debug!(self.logger, "invoking raw put request");
         let request = new_raw_put_request(key.into(), value.into(), self.cf.clone(), self.atomic);
         let plan = crate::request::PlanBuilder::new(self.rpc.clone(), request)
-            .retry_multi_region(DEFAULT_REGION_BACKOFF)
+            .retry_multi_region(backoff)
             .merge(CollectSingle)
             .extract_error()
             .plan();
@@ -279,6 +303,15 @@ impl<PdC: PdClient> Client<PdC> {
     pub async fn batch_put(
         &self,
         pairs: impl IntoIterator<Item = impl Into<KvPair>>,
+    ) -> Result<()> {
+        self.batch_put_opt(pairs, DEFAULT_REGION_BACKOFF).await
+    }
+
+    /// Same as [`batch_put`](Client::batch_put) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn batch_put_opt(
+        &self,
+        pairs: impl IntoIterator<Item = impl Into<KvPair>>,
+        backoff: Backoff,
     ) -> Result<()> {
         debug!(self.logger, "invoking raw batch_put request");
         let request = new_raw_batch_put_request(
@@ -287,7 +320,7 @@ impl<PdC: PdClient> Client<PdC> {
             self.atomic,
         );
         let plan = crate::request::PlanBuilder::new(self.rpc.clone(), request)
-            .retry_multi_region(DEFAULT_REGION_BACKOFF)
+            .retry_multi_region(backoff)
             .extract_error()
             .plan();
         plan.execute().await?;
@@ -312,10 +345,15 @@ impl<PdC: PdClient> Client<PdC> {
     /// # });
     /// ```
     pub async fn delete(&self, key: impl Into<Key>) -> Result<()> {
+        self.delete_opt(key, DEFAULT_REGION_BACKOFF).await
+    }
+
+    /// Same as [`delete`](Client::delete) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn delete_opt(&self, key: impl Into<Key>, backoff: Backoff) -> Result<()> {
         debug!(self.logger, "invoking raw delete request");
         let request = new_raw_delete_request(key.into(), self.cf.clone(), self.atomic);
         let plan = crate::request::PlanBuilder::new(self.rpc.clone(), request)
-            .retry_multi_region(DEFAULT_REGION_BACKOFF)
+            .retry_multi_region(backoff)
             .merge(CollectSingle)
             .extract_error()
             .plan();
@@ -341,12 +379,21 @@ impl<PdC: PdClient> Client<PdC> {
     /// # });
     /// ```
     pub async fn batch_delete(&self, keys: impl IntoIterator<Item = impl Into<Key>>) -> Result<()> {
+        self.batch_delete_opt(keys, DEFAULT_REGION_BACKOFF).await
+    }
+
+    /// Same as [`batch_delete`](Client::batch_delete) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn batch_delete_opt(
+        &self,
+        keys: impl IntoIterator<Item = impl Into<Key>>,
+        backoff: Backoff,
+    ) -> Result<()> {
         debug!(self.logger, "invoking raw batch_delete request");
         self.assert_non_atomic()?;
         let request =
             new_raw_batch_delete_request(keys.into_iter().map(Into::into), self.cf.clone());
         let plan = crate::request::PlanBuilder::new(self.rpc.clone(), request)
-            .retry_multi_region(DEFAULT_REGION_BACKOFF)
+            .retry_multi_region(backoff)
             .extract_error()
             .plan();
         plan.execute().await?;
@@ -372,6 +419,7 @@ impl<PdC: PdClient> Client<PdC> {
         self.delete_range_opt(range, DEFAULT_REGION_BACKOFF).await
     }
 
+    /// Same as [`delete_range`](Client::delete_range) but with custom [`backoff`](crate::Backoff) strategy.
     pub async fn delete_range_opt(
         &self,
         range: impl Into<BoundRange>,
@@ -408,8 +456,18 @@ impl<PdC: PdClient> Client<PdC> {
     /// # });
     /// ```
     pub async fn scan(&self, range: impl Into<BoundRange>, limit: u32) -> Result<Vec<KvPair>> {
+        self.scan_opt(range, limit, DEFAULT_REGION_BACKOFF).await
+    }
+
+    /// Same as [`scan`](Client::scan) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn scan_opt(
+        &self,
+        range: impl Into<BoundRange>,
+        limit: u32,
+        backoff: Backoff,
+    ) -> Result<Vec<KvPair>> {
         debug!(self.logger, "invoking raw scan request");
-        self.scan_inner(range.into(), limit, false).await
+        self.scan_inner(range.into(), limit, false, backoff).await
     }
 
     /// Create a new 'scan' request that only returns the keys.
@@ -432,9 +490,20 @@ impl<PdC: PdClient> Client<PdC> {
     /// # });
     /// ```
     pub async fn scan_keys(&self, range: impl Into<BoundRange>, limit: u32) -> Result<Vec<Key>> {
+        self.scan_keys_opt(range, limit, DEFAULT_REGION_BACKOFF)
+            .await
+    }
+
+    /// Same as [`scan_keys`](Client::scan_keys) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn scan_keys_opt(
+        &self,
+        range: impl Into<BoundRange>,
+        limit: u32,
+        backoff: Backoff,
+    ) -> Result<Vec<Key>> {
         debug!(self.logger, "invoking raw scan_keys request");
         Ok(self
-            .scan_inner(range, limit, true)
+            .scan_inner(range, limit, true, backoff)
             .await?
             .into_iter()
             .map(KvPair::into_key)
@@ -468,9 +537,21 @@ impl<PdC: PdClient> Client<PdC> {
         &self,
         ranges: impl IntoIterator<Item = impl Into<BoundRange>>,
         each_limit: u32,
+    ) -> Result<Vec<KvPair>> {
+        self.batch_scan_opt(ranges, each_limit, DEFAULT_REGION_BACKOFF)
+            .await
+    }
+
+    /// Same as [`batch_scan`](Client::batch_scan) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn batch_scan_opt(
+        &self,
+        ranges: impl IntoIterator<Item = impl Into<BoundRange>>,
+        each_limit: u32,
+        backoff: Backoff,
     ) -> Result<Vec<KvPair>> {
         debug!(self.logger, "invoking raw batch_scan request");
-        self.batch_scan_inner(ranges, each_limit, false).await
+        self.batch_scan_inner(ranges, each_limit, false, backoff)
+            .await
     }
 
     /// Create a new 'batch scan' request that only returns the keys.
@@ -500,10 +581,21 @@ impl<PdC: PdClient> Client<PdC> {
         &self,
         ranges: impl IntoIterator<Item = impl Into<BoundRange>>,
         each_limit: u32,
+    ) -> Result<Vec<Key>> {
+        self.batch_scan_keys_opt(ranges, each_limit, DEFAULT_REGION_BACKOFF)
+            .await
+    }
+
+    /// Same as [`batch_scan_keys`](Client::batch_scan_keys) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn batch_scan_keys_opt(
+        &self,
+        ranges: impl IntoIterator<Item = impl Into<BoundRange>>,
+        each_limit: u32,
+        backoff: Backoff,
     ) -> Result<Vec<Key>> {
         debug!(self.logger, "invoking raw batch_scan_keys request");
         Ok(self
-            .batch_scan_inner(ranges, each_limit, true)
+            .batch_scan_inner(ranges, each_limit, true, backoff)
             .await?
             .into_iter()
             .map(KvPair::into_key)
@@ -527,6 +619,18 @@ impl<PdC: PdClient> Client<PdC> {
         key: impl Into<Key>,
         previous_value: impl Into<Option<Value>>,
         new_value: impl Into<Value>,
+    ) -> Result<(Option<Value>, bool)> {
+        self.compare_and_swap_opt(key, previous_value, new_value, DEFAULT_REGION_BACKOFF)
+            .await
+    }
+
+    /// Same as [`compare_and_swap`](Client::compare_and_swap) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn compare_and_swap_opt(
+        &self,
+        key: impl Into<Key>,
+        previous_value: impl Into<Option<Value>>,
+        new_value: impl Into<Value>,
+        backoff: Backoff,
     ) -> Result<(Option<Value>, bool)> {
         debug!(self.logger, "invoking raw compare_and_swap request");
         self.assert_atomic()?;
@@ -537,7 +641,7 @@ impl<PdC: PdClient> Client<PdC> {
             self.cf.clone(),
         );
         let plan = crate::request::PlanBuilder::new(self.rpc.clone(), req)
-            .retry_multi_region(DEFAULT_REGION_BACKOFF)
+            .retry_multi_region(backoff)
             .merge(CollectSingle)
             .post_process_default()
             .plan();
@@ -550,6 +654,25 @@ impl<PdC: PdClient> Client<PdC> {
         copr_version_req: impl Into<String>,
         ranges: impl IntoIterator<Item = impl Into<BoundRange>>,
         request_builder: impl Fn(metapb::Region, Vec<Range<Key>>) -> Vec<u8> + Send + Sync + 'static,
+    ) -> Result<Vec<(Vec<u8>, Vec<Range<Key>>)>> {
+        self.coprocessor_opt(
+            copr_name,
+            copr_version_req,
+            ranges,
+            request_builder,
+            DEFAULT_REGION_BACKOFF,
+        )
+        .await
+    }
+
+    /// Same as [`coprocessor`](Client::coprocessor) but with custom [`backoff`](crate::Backoff) strategy.
+    pub async fn coprocessor_opt(
+        &self,
+        copr_name: impl Into<String>,
+        copr_version_req: impl Into<String>,
+        ranges: impl IntoIterator<Item = impl Into<BoundRange>>,
+        request_builder: impl Fn(metapb::Region, Vec<Range<Key>>) -> Vec<u8> + Send + Sync + 'static,
+        backoff: Backoff,
     ) -> Result<Vec<(Vec<u8>, Vec<Range<Key>>)>> {
         let copr_version_req = copr_version_req.into();
         semver::VersionReq::from_str(&copr_version_req)?;
@@ -561,7 +684,7 @@ impl<PdC: PdClient> Client<PdC> {
         );
         let plan = crate::request::PlanBuilder::new(self.rpc.clone(), req)
             .preserve_shard()
-            .retry_multi_region(DEFAULT_REGION_BACKOFF)
+            .retry_multi_region(backoff)
             .post_process_default()
             .plan();
         plan.execute().await
@@ -572,6 +695,7 @@ impl<PdC: PdClient> Client<PdC> {
         range: impl Into<BoundRange>,
         limit: u32,
         key_only: bool,
+        backoff: Backoff,
     ) -> Result<Vec<KvPair>> {
         if limit > MAX_RAW_KV_SCAN_LIMIT {
             return Err(Error::MaxScanLimitExceeded {
@@ -582,7 +706,7 @@ impl<PdC: PdClient> Client<PdC> {
 
         let request = new_raw_scan_request(range.into(), limit, key_only, self.cf.clone());
         let plan = crate::request::PlanBuilder::new(self.rpc.clone(), request)
-            .retry_multi_region(DEFAULT_REGION_BACKOFF)
+            .retry_multi_region(backoff)
             .merge(Collect)
             .plan();
         let res = plan.execute().await;
@@ -597,6 +721,7 @@ impl<PdC: PdClient> Client<PdC> {
         ranges: impl IntoIterator<Item = impl Into<BoundRange>>,
         each_limit: u32,
         key_only: bool,
+        backoff: Backoff,
     ) -> Result<Vec<KvPair>> {
         if each_limit > MAX_RAW_KV_SCAN_LIMIT {
             return Err(Error::MaxScanLimitExceeded {
@@ -612,7 +737,7 @@ impl<PdC: PdClient> Client<PdC> {
             self.cf.clone(),
         );
         let plan = crate::request::PlanBuilder::new(self.rpc.clone(), request)
-            .retry_multi_region(DEFAULT_REGION_BACKOFF)
+            .retry_multi_region(backoff)
             .merge(Collect)
             .plan();
         plan.execute().await