refactor: use pagination to load values from pstor

Signed-off-by: Abhinandan Purkait <purkaitabhinandan@gmail.com>

control-plane/agents/src/bin/core/controller/registry.rs

@@ -100,6 +100,8 @@ pub(crate) struct RegistryInner<S: Store> {
     thin_args: ThinArgs,
     /// Check if the HA feature is enabled.
     ha_disabled: bool,
+    /// Etcd max page size.
+    etcd_max_page_size: i64,
 }
 
 impl Registry {
@@ -121,6 +123,7 @@ impl Registry {
         host_acl: Vec<HostAccessControl>,
         thin_args: ThinArgs,
         ha_enabled: bool,
+        etcd_max_page_size: i64,
     ) -> Result<Self, SvcError> {
         let store_endpoint = Self::format_store_endpoint(&store_url);
         tracing::info!("Connecting to persistent store at {}", store_endpoint);
@@ -171,14 +174,15 @@ impl Registry {
                 legacy_prefix_present,
                 thin_args,
                 ha_disabled: ha_enabled,
+                etcd_max_page_size,
             }),
         };
         registry.init().await?;
 
         // Disable v1 compat if nexus_info keys are migrated.
         if registry.config().mayastor_compat_v1() && registry.nexus_info_v1_migrated().await? {
             // Delete the v1 nexus_info keys by brute force.
-            delete_all_v1_nexus_info(&mut store)
+            delete_all_v1_nexus_info(&mut store, etcd_max_page_size)
                 .await
                 .map_err(|error| StoreError::Generic {
                     source: Box::new(error),
@@ -406,7 +410,11 @@ impl Registry {
     async fn init(&self) -> Result<(), SvcError> {
         let mut store = self.store.lock().await;
         self.specs
-            .init(store.deref_mut(), self.legacy_prefix_present)
+            .init(
+                store.deref_mut(),
+                self.legacy_prefix_present,
+                self.etcd_max_page_size,
+            )
             .await?;
         Ok(())
     }

control-plane/agents/src/bin/core/controller/resources/migration.rs

@@ -16,10 +16,13 @@ pub const MSP_OPERATOR: &str = "msp-operator";
 pub(crate) async fn migrate_product_v1_to_v2<S: Store>(
     store: &mut S,
     spec_type: StorableObjectType,
+    etcd_max_page_size: i64,
 ) -> Result<(), StoreError> {
     info!("Migrating {spec_type:?} from v1 to v2 key space");
     let prefix = &product_v1_key_prefix_obj(spec_type);
-    let store_entries = store.get_values_prefix(prefix).await?;
+    let store_entries = store
+        .get_values_paged_all(prefix, etcd_max_page_size)
+        .await?;
     for (k, v) in store_entries {
         let id = k
             .split('/')

control-plane/agents/src/bin/core/controller/resources/operations_helper.rs

@@ -7,7 +7,8 @@ use crate::controller::{
 };
 use agents::errors::SvcError;
 use stor_port::{
-    transport_api::ResourceKind,
+    pstor::{product_v1_key_prefix, API_VERSION},
+    transport_api::{ErrorChain, ResourceKind},
     types::v0::{
         openapi::apis::Uuid,
         store::{
@@ -18,10 +19,11 @@ use stor_port::{
             node::NodeSpec,
             pool::PoolSpec,
             replica::ReplicaSpec,
-            volume::{AffinityGroupSpec, VolumeSpec},
+            snapshots::volume::VolumeSnapshot,
+            volume::{AffinityGroupSpec, VolumeContentSource, VolumeSpec},
             AsOperationSequencer, OperationMode, OperationSequence, SpecStatus, SpecTransaction,
         },
-        transport::{NexusId, NodeId, PoolId, ReplicaId, VolumeId},
+        transport::{NexusId, NodeId, PoolId, ReplicaId, SnapshotId, VolumeId},
     },
 };
 
@@ -30,14 +32,6 @@ use parking_lot::RwLock;
 use serde::de::DeserializeOwned;
 use snafu::{ResultExt, Snafu};
 use std::{fmt::Debug, ops::Deref, sync::Arc};
-use stor_port::{
-    pstor::{product_v1_key_prefix, API_VERSION},
-    transport_api::ErrorChain,
-    types::v0::{
-        store::{snapshots::volume::VolumeSnapshot, volume::VolumeContentSource},
-        transport::SnapshotId,
-    },
-};
 
 #[derive(Debug, Snafu)]
 #[snafu(context(suffix(false)))]
@@ -909,6 +903,7 @@ impl ResourceSpecsLocked {
         &self,
         store: &mut S,
         legacy_prefix_present: bool,
+        etcd_max_page_size: i64,
     ) -> Result<(), SvcError> {
         let spec_types = [
             StorableObjectType::VolumeSpec,
@@ -919,7 +914,7 @@ impl ResourceSpecsLocked {
             StorableObjectType::VolumeSnapshot,
         ];
         for spec in &spec_types {
-            self.populate_specs(store, *spec, legacy_prefix_present)
+            self.populate_specs(store, *spec, legacy_prefix_present, etcd_max_page_size)
                 .await
                 .map_err(|error| SvcError::Internal {
                     details: error.full_string(),
@@ -996,22 +991,22 @@ impl ResourceSpecsLocked {
         store: &mut S,
         spec_type: StorableObjectType,
         legacy_prefix_present: bool,
+        etcd_max_page_size: i64,
     ) -> Result<(), SpecError> {
         if legacy_prefix_present {
-            migrate_product_v1_to_v2(store, spec_type)
+            migrate_product_v1_to_v2(store, spec_type, etcd_max_page_size)
                 .await
                 .map_err(|e| SpecError::StoreMigrate {
                     source: Box::new(e),
                 })?;
         }
         let prefix = key_prefix_obj(spec_type, API_VERSION);
-        let store_entries =
-            store
-                .get_values_prefix(&prefix)
-                .await
-                .map_err(|e| SpecError::StoreGet {
-                    source: Box::new(e),
-                })?;
+        let store_entries = store
+            .get_values_paged_all(&prefix, etcd_max_page_size)
+            .await
+            .map_err(|e| SpecError::StoreGet {
+                source: Box::new(e),
+            })?;
         let store_values = store_entries.iter().map(|e| e.1.clone()).collect();
 
         let mut resource_specs = self.0.write();

control-plane/agents/src/bin/core/main.rs

@@ -18,7 +18,7 @@ pub(crate) mod watch;
 use clap::Parser;
 use controller::registry::NumRebuilds;
 use std::{net::SocketAddr, num::ParseIntError};
-use utils::{version_info_str, DEFAULT_GRPC_SERVER_ADDR};
+use utils::{version_info_str, DEFAULT_GRPC_SERVER_ADDR, ETCD_MAX_PAGE_LIMIT};
 
 use stor_port::HostAccessControl;
 use utils::tracing_telemetry::{trace::TracerProvider, KeyValue};
@@ -108,6 +108,10 @@ pub(crate) struct CliArgs {
     /// This is useful when the frontend nodes do not support the NVMe ANA feature.
     #[clap(long, env = "HA_DISABLED")]
     pub(crate) disable_ha: bool,
+
+    /// Etcd Pagination Limit.
+    #[clap(long, default_value = ETCD_MAX_PAGE_LIMIT)]
+    pub(crate) etcd_page_limit: u32,
 }
 impl CliArgs {
     fn args() -> Self {
@@ -178,6 +182,7 @@ async fn server(cli_args: CliArgs) -> anyhow::Result<()> {
         },
         cli_args.thin_args,
         cli_args.disable_ha,
+        cli_args.etcd_page_limit as i64,
     )
     .await?;
 

control-plane/agents/src/bin/core/tests/controller/mod.rs

@@ -1,12 +1,16 @@
 use deployer_cluster::{etcd_client::Client, *};
+use itertools::Itertools;
+use serde_json::Value;
+use std::str::FromStr;
 use stor_port::{
-    pstor::{etcd::Etcd, StoreObj},
+    pstor::{etcd::Etcd, StoreKv, StoreObj},
     types::v0::{
         openapi::models,
         store::registry::{ControlPlaneService, StoreLeaseOwner, StoreLeaseOwnerKey},
         transport,
     },
 };
+use uuid::Uuid;
 
 /// Test that the content of the registry is correctly loaded from the persistent store on start up.
 #[tokio::test]
@@ -212,3 +216,111 @@ async fn core_agent_lease_lock() {
     tracing::info!("core: {:?}", core.state);
     assert_eq!(Some(false), core.state.unwrap().running);
 }
+
+const OLD_VOLUME_PREFIX: &str = "/namespace/default/control-plane/VolumeSpec";
+
+#[tokio::test]
+async fn etcd_pagination() {
+    let lease_ttl = std::time::Duration::from_secs(2);
+    let cluster = ClusterBuilder::builder()
+        .with_io_engines(0)
+        .with_rest(false)
+        .with_jaeger(false)
+        .with_store_lease_ttl(lease_ttl)
+        .build()
+        .await
+        .unwrap();
+
+    let mut etcd = Etcd::new("0.0.0.0:2379").await.unwrap();
+
+    let cluster_id = get_cluster_id(&mut etcd).await;
+
+    let node_prefix = format!(
+        "/openebs.io/mayastor/apis/v0/clusters/{}/namespaces/default/NodeSpec",
+        cluster_id
+    );
+    let volume_prefix = format!(
+        "/openebs.io/mayastor/apis/v0/clusters/{}/namespaces/default/VolumeSpec",
+        cluster_id
+    );
+
+    // Persist some nodes in etcd.
+    for i in 1 .. 11 {
+        let key = format!("{}/node{}", node_prefix, i);
+        let json_str = format!(
+            r#"{{"id":"mayastor-node{}","endpoint":"136.144.51.107:10124","labels":{{}}}}"#,
+            i
+        );
+        let value = Value::from_str(&json_str).unwrap();
+        etcd.put_kv(&key, &value).await.unwrap();
+    }
+
+    // Persist some volumes in new keyspace in etcd.
+    for _i in 1 .. 6 {
+        let uuid = Uuid::new_v4();
+        let key = format!("{}/{}", volume_prefix, uuid);
+        let json_str = r#"{"uuid":"456122b1-7e19-4148-a890-579ca785a119","size":2147483648,"labels":{"local":"true"},"num_replicas":3,"status":{"Created":"Online"},"target":{"node":"mayastor-node4","nexus":"d6ccbb97-d13e-4ffb-91a0-c7607bb01f8f","protocol":"nvmf"},"policy":{"self_heal":true},"topology":{"node":{"Explicit":{"allowed_nodes":["mayastor-node2","mayastor-master","mayastor-node3","mayastor-node1","mayastor-node4"],"preferred_nodes":["mayastor-node2","mayastor-node3","mayastor-node4","mayastor-master","mayastor-node1"]}},"pool":{"Labelled":{"exclusion":{},"inclusion":{"openebs.io/created-by":"msp-operator"}}}},"last_nexus_id":"d6ccbb97-d13e-4ffb-91a0-c7607bb01f8f","operation":null}"#;
+        let value = Value::from_str(json_str).unwrap();
+        etcd.put_kv(&key, &value).await.unwrap();
+    }
+
+    // Persist some volumes in old key space in etcd.
+    for _i in 1 .. 6 {
+        let uuid = Uuid::new_v4();
+        let key = format!("{}/{}", OLD_VOLUME_PREFIX, uuid);
+        let json_str = r#"{"uuid":"456122b1-7e19-4148-a890-579ca785a119","size":2147483648,"labels":{"local":"true"},"num_replicas":3,"status":{"Created":"Online"},"target":{"node":"mayastor-node4","nexus":"d6ccbb97-d13e-4ffb-91a0-c7607bb01f8f","protocol":"nvmf"},"policy":{"self_heal":true},"topology":{"node":{"Explicit":{"allowed_nodes":["mayastor-node2","mayastor-master","mayastor-node3","mayastor-node1","mayastor-node4"],"preferred_nodes":["mayastor-node2","mayastor-node3","mayastor-node4","mayastor-master","mayastor-node1"]}},"pool":{"Labelled":{"exclusion":{},"inclusion":{"openebs.io/created-by":"msp-operator"}}}},"last_nexus_id":"d6ccbb97-d13e-4ffb-91a0-c7607bb01f8f","operation":null}"#;
+        let value = Value::from_str(json_str).unwrap();
+        etcd.put_kv(&key, &value).await.unwrap();
+    }
+
+    // Persist some nexus info in old key space in etcd.
+    for _i in 1 .. 6 {
+        let uuid = Uuid::new_v4();
+        let key = format!("{}", uuid);
+        let json_str = r#"{"children":[{"healthy":true,"uuid":"82779efa-a0c7-4652-a37b-83eefd894714"},{"healthy":true,"uuid":"2d98fa96-ac12-40be-acdc-e3559c0b1530"},{"healthy":true,"uuid":"620ff519-419a-48d6-97a8-c1ba3260d87e"}],"clean_shutdown":false}"#;
+        let value = Value::from_str(json_str).unwrap();
+        etcd.put_kv(&key, &value).await.unwrap();
+    }
+
+    // There Should be exactly 10 Nodes.
+    let node_kvs = etcd.get_values_paged_all(&node_prefix, 3).await.unwrap();
+    assert_eq!(node_kvs.len(), 10);
+
+    // There Should be exactly 5 New Volumes.
+    let volume_kvs = etcd.get_values_paged_all(&volume_prefix, 3).await.unwrap();
+    assert_eq!(volume_kvs.len(), 5);
+
+    // There Should be exactly 5 Old Volumes.
+    let volume_kvs = etcd
+        .get_values_paged_all(OLD_VOLUME_PREFIX, 3)
+        .await
+        .unwrap();
+    assert_eq!(volume_kvs.len(), 5);
+
+    cluster.restart_core().await;
+    cluster
+        .volume_service_liveness(None)
+        .await
+        .expect("Should have restarted by now");
+
+    // There Should be exactly 10 New Volumes, after the migration.
+    let volume_kvs_all = etcd.get_values_paged_all(&volume_prefix, 3).await.unwrap();
+    assert_eq!(volume_kvs_all.len(), 10);
+
+    let all = etcd.get_values_paged_all("", 3).await.unwrap();
+    assert_eq!(all.len(), 28);
+}
+
+// Helper Methods
+
+// Get the cluster id from etcd.
+async fn get_cluster_id(etcd: &mut Etcd) -> String {
+    let kvs = etcd.get_values_paged("", 3, "").await.unwrap();
+    let chunks = kvs[0].0.split('/').collect::<Vec<&str>>();
+    let cluster_word_ind = chunks
+        .iter()
+        .find_position(|x| **x == "clusters")
+        .unwrap()
+        .0;
+    chunks[cluster_word_ind + 1].to_string()
+}

control-plane/stor-port/src/types/v0/store/nexus_persistence.rs

@@ -8,9 +8,6 @@ use std::fmt::Debug;
 use tracing::info;
 use uuid::Uuid;
 
-/// ETCD Pagination limit.
-const ETCD_PAGED_LIMIT: i64 = 1000;
-
 /// Definition of the nexus information that gets saved in the persistent
 /// store.
 #[derive(Serialize, Deserialize, Debug, Default, Clone, Eq, PartialEq)]
@@ -139,12 +136,15 @@ impl StorableObject for NexusInfo {
 
 /// Deletes all v1 nexus_info by fetching all keys and parsing the key to UUID and deletes on
 /// success.
-pub async fn delete_all_v1_nexus_info<S: Store>(store: &mut S) -> Result<(), StoreError> {
+pub async fn delete_all_v1_nexus_info<S: Store>(
+    store: &mut S,
+    etcd_page_limit: i64,
+) -> Result<(), StoreError> {
     let mut prefix: &str = "";
     let mut first = true;
     let mut kvs;
     loop {
-        kvs = store.get_values_paged(prefix, ETCD_PAGED_LIMIT).await?;
+        kvs = store.get_values_paged(prefix, etcd_page_limit, "").await?;
         if !first && kvs.get(0).is_some() {
             kvs.remove(0);
         }

utils/pstor/src/api.rs

@@ -33,6 +33,14 @@ pub trait StoreKv: Sync + Send + Clone {
         &mut self,
         key_prefix: &str,
         limit: i64,
+        range_end: &str,
+    ) -> Result<Vec<(String, Value)>, Error>;
+    /// Returns a vector of tuples. Each tuple represents a key-value pair. It paginates through all
+    /// the values for the prefix with limit.
+    async fn get_values_paged_all(
+        &mut self,
+        key_prefix: &str,
+        limit: i64,
     ) -> Result<Vec<(String, Value)>, Error>;
     /// Deletes all key values from a given prefix.
     async fn delete_values_prefix(&mut self, key_prefix: &str) -> Result<(), Error>;

utils/pstor/src/error.rs

@@ -86,4 +86,6 @@ pub enum Error {
         source: Box<Error>,
         description: String,
     },
+    #[snafu(display("Failed to parse range end for start key: '{}'", start_key))]
+    RangeEnd { start_key: String },
 }