feat: flow recreate on reboot

src/cmd/src/flownode.rs

@@ -24,6 +24,7 @@ use common_grpc::channel_manager::ChannelConfig;
 use common_meta::cache::{CacheRegistryBuilder, LayeredCacheRegistryBuilder};
 use common_meta::heartbeat::handler::parse_mailbox_message::ParseMailboxMessageHandler;
 use common_meta::heartbeat::handler::HandlerGroupExecutor;
+use common_meta::key::flow::FlowMetadataManager;
 use common_meta::key::TableMetadataManager;
 use common_telemetry::info;
 use common_telemetry::logging::TracingOptions;
@@ -296,11 +297,13 @@ impl StartCommand {
             Arc::new(executor),
         );
 
+        let flow_metadata_manager = Arc::new(FlowMetadataManager::new(cached_meta_backend.clone()));
         let flownode_builder = FlownodeBuilder::new(
             opts,
             Plugins::new(),
             table_metadata_manager,
             catalog_manager.clone(),
+            flow_metadata_manager,
         )
         .with_heartbeat_task(heartbeat_task);
 

src/cmd/src/standalone.rs

@@ -476,11 +476,13 @@ impl StartCommand {
             .await
             .context(StartDatanodeSnafu)?;
 
+        let flow_metadata_manager = Arc::new(FlowMetadataManager::new(kv_backend.clone()));
         let flow_builder = FlownodeBuilder::new(
             Default::default(),
             plugins.clone(),
             table_metadata_manager.clone(),
             catalog_manager.clone(),
+            flow_metadata_manager.clone(),
         );
         let flownode = Arc::new(
             flow_builder
@@ -511,7 +513,6 @@ impl StartCommand {
             opts.wal.into(),
             kv_backend.clone(),
         ));
-        let flow_metadata_manager = Arc::new(FlowMetadataManager::new(kv_backend.clone()));
         let table_meta_allocator = Arc::new(TableMetadataAllocator::new(
             table_id_sequence,
             wal_options_allocator.clone(),

src/flow/src/error.rs

@@ -83,6 +83,14 @@ pub enum Error {
         location: Location,
     },
 
+    #[snafu(display("Failed to list flows in flownode={id:?}"))]
+    ListFlows {
+        id: Option<common_meta::FlownodeId>,
+        source: common_meta::error::Error,
+        #[snafu(implicit)]
+        location: Location,
+    },
+
     #[snafu(display("Flow already exist, id={id}"))]
     FlowAlreadyExist {
         id: FlowId,
@@ -214,7 +222,8 @@ impl ErrorExt for Error {
             }
             Self::TableNotFound { .. }
             | Self::TableNotFoundMeta { .. }
-            | Self::FlowNotFound { .. } => StatusCode::TableNotFound,
+            | Self::FlowNotFound { .. }
+            | Self::ListFlows { .. } => StatusCode::TableNotFound,
             Self::InvalidQueryProst { .. }
             | &Self::InvalidQuery { .. }
             | &Self::Plan { .. }

src/flow/src/server.rs

@@ -29,12 +29,13 @@ use common_meta::cache::{
 };
 use common_meta::ddl::{table_meta, ProcedureExecutorRef};
 use common_meta::heartbeat::handler::HandlerGroupExecutor;
+use common_meta::key::flow::FlowMetadataManagerRef;
 use common_meta::key::TableMetadataManagerRef;
 use common_meta::kv_backend::KvBackendRef;
 use common_meta::node_manager::{self, Flownode, NodeManagerRef};
 use common_query::Output;
 use common_telemetry::tracing::info;
-use futures::FutureExt;
+use futures::{FutureExt, StreamExt, TryStreamExt};
 use greptime_proto::v1::flow::{flow_server, FlowRequest, FlowResponse, InsertRequests};
 use itertools::Itertools;
 use meta_client::client::MetaClient;
@@ -47,7 +48,7 @@ use serde::de::Unexpected;
 use servers::error::{AlreadyStartedSnafu, StartGrpcSnafu, TcpBindSnafu, TcpIncomingSnafu};
 use servers::heartbeat_options::HeartbeatOptions;
 use servers::server::Server;
-use session::context::QueryContextRef;
+use session::context::{QueryContext, QueryContextBuilder, QueryContextRef};
 use snafu::{ensure, OptionExt, ResultExt};
 use tokio::net::TcpListener;
 use tokio::sync::{broadcast, oneshot, Mutex};
@@ -57,7 +58,8 @@ use tonic::{Request, Response, Status};
 
 use crate::adapter::FlowWorkerManagerRef;
 use crate::error::{
-    CacheRequiredSnafu, ParseAddrSnafu, ShutdownServerSnafu, StartServerSnafu, UnexpectedSnafu,
+    CacheRequiredSnafu, ExternalSnafu, FlowNotFoundSnafu, ListFlowsSnafu, ParseAddrSnafu,
+    ShutdownServerSnafu, StartServerSnafu, UnexpectedSnafu,
 };
 use crate::heartbeat::HeartbeatTask;
 use crate::transform::register_function_to_query_engine;
@@ -240,6 +242,7 @@ pub struct FlownodeBuilder {
     plugins: Plugins,
     table_meta: TableMetadataManagerRef,
     catalog_manager: CatalogManagerRef,
+    flow_metadata_manager: FlowMetadataManagerRef,
     heartbeat_task: Option<HeartbeatTask>,
 }
 
@@ -250,12 +253,14 @@ impl FlownodeBuilder {
         plugins: Plugins,
         table_meta: TableMetadataManagerRef,
         catalog_manager: CatalogManagerRef,
+        flow_metadata_manager: FlowMetadataManagerRef,
     ) -> Self {
         Self {
             opts,
             plugins,
             table_meta,
             catalog_manager,
+            flow_metadata_manager,
             heartbeat_task: None,
         }
     }
@@ -283,6 +288,11 @@ impl FlownodeBuilder {
             self.build_manager(query_engine_factory.query_engine())
                 .await?,
         );
+
+        if let Err(err) = self.recover_flows(&manager).await {
+            common_telemetry::error!(err; "Failed to recover flows");
+        }
+
         let server = FlownodeServer::new(FlowService::new(manager.clone()));
 
         let heartbeat_task = self.heartbeat_task;
@@ -296,6 +306,85 @@ impl FlownodeBuilder {
         Ok(instance)
     }
 
+    /// recover all flow tasks in this flownode in distributed mode(nodeid is Some(<num>))
+    ///
+    /// or recover all existing flow tasks if in standalone mode(nodeid is None)
+    ///
+    /// TODO(discord9): persisent flow tasks with internal state
+    async fn recover_flows(&self, manager: &FlowWorkerManagerRef) -> Result<usize, Error> {
+        let nodeid = self.opts.node_id;
+        let to_be_recovered: Vec<_> = if let Some(nodeid) = nodeid {
+            let to_be_recover = self
+                .flow_metadata_manager
+                .flownode_flow_manager()
+                .flows(nodeid)
+                .try_collect::<Vec<_>>()
+                .await
+                .context(ListFlowsSnafu { id: Some(nodeid) })?;
+            to_be_recover.into_iter().map(|(id, _)| id).collect()
+        } else {
+            let all_catalogs = self
+                .catalog_manager
+                .catalog_names()
+                .await
+                .map_err(BoxedError::new)
+                .context(ExternalSnafu)?;
+            let mut all_flow_ids = vec![];
+            for catalog in all_catalogs {
+                let flows = self
+                    .flow_metadata_manager
+                    .flow_name_manager()
+                    .flow_names(&catalog)
+                    .await
+                    .try_collect::<Vec<_>>()
+                    .await
+                    .map_err(BoxedError::new)
+                    .context(ExternalSnafu)?;
+
+                all_flow_ids.extend(flows.into_iter().map(|(_, id)| id.flow_id()));
+            }
+            all_flow_ids
+        };
+        let cnt = to_be_recovered.len();
+
+        // TODO(discord9): recover in parallel
+        for flow_id in to_be_recovered {
+            let info = self
+                .flow_metadata_manager
+                .flow_info_manager()
+                .get(flow_id)
+                .await
+                .map_err(BoxedError::new)
+                .context(ExternalSnafu)?
+                .context(FlowNotFoundSnafu { id: flow_id })?;
+
+            let sink_table_name = [
+                info.sink_table_name().catalog_name.clone(),
+                info.sink_table_name().schema_name.clone(),
+                info.sink_table_name().table_name.clone(),
+            ];
+            manager
+                .create_flow(
+                    flow_id as _,
+                    sink_table_name,
+                    info.source_table_ids(),
+                    true,
+                    info.expire_after(),
+                    Some(info.comment().clone()),
+                    info.raw_sql().clone(),
+                    info.options().clone(),
+                    Some(
+                        QueryContextBuilder::default()
+                            .current_catalog(info.catalog_name().clone())
+                            .build(),
+                    ),
+                )
+                .await?;
+        }
+
+        Ok(cnt)
+    }
+
     /// build [`FlowWorkerManager`], note this doesn't take ownership of `self`,
     /// nor does it actually start running the worker.
     async fn build_manager(

tests-integration/src/standalone.rs

@@ -156,6 +156,7 @@ impl GreptimeDbStandaloneBuilder {
             plugins.clone(),
             table_metadata_manager.clone(),
             catalog_manager.clone(),
+            flow_metadata_manager.clone(),
         );
         let flownode = Arc::new(flow_builder.build().await.unwrap());
 

tests/cases/standalone/common/flow/flow_basic.result

@@ -24,6 +24,7 @@ select flush_flow('test_numbers_basic')<=1;
 | true                                               |
 +----------------------------------------------------+
 
+-- SQLNESS ARG restart=true
 INSERT INTO numbers_input_basic 
 VALUES
     (20, "2021-07-01 00:00:00.200"),

tests/cases/standalone/common/flow/flow_basic.sql

@@ -14,6 +14,7 @@ SELECT sum(number) FROM numbers_input_basic GROUP BY tumble(ts, '1 second', '202
 -- because flush_flow result is at most 1
 select flush_flow('test_numbers_basic')<=1;
 
+-- SQLNESS ARG restart=true
 INSERT INTO numbers_input_basic 
 VALUES
     (20, "2021-07-01 00:00:00.200"),