[GitHub] [arrow-datafusion] thinkharderdev commented on a change in pull request #1911: Refactor scheduler server

[GitBox <gi...@apache.org>]

thinkharderdev commented on a change in pull request #1911:
URL: https://github.com/apache/arrow-datafusion/pull/1911#discussion_r819829732



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File path: ballista/rust/scheduler/src/scheduler_server/mod.rs
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@@ -0,0 +1,294 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+use std::collections::HashMap;
+use std::marker::PhantomData;
+use std::sync::Arc;
+
+use log::{debug, error, info, warn};
+use tonic::Status;
+
+use crate::state::{ConfigBackendClient, SchedulerState};
+use ballista_core::config::{BallistaConfig, TaskSchedulingPolicy};
+use ballista_core::error::BallistaError;
+use ballista_core::execution_plans::ShuffleWriterExec;
+use ballista_core::serde::protobuf::executor_grpc_client::ExecutorGrpcClient;
+use ballista_core::serde::protobuf::{LaunchTaskParams, TaskDefinition};
+use ballista_core::serde::scheduler::to_proto::hash_partitioning_to_proto;
+use ballista_core::serde::scheduler::ExecutorData;
+use ballista_core::serde::{AsExecutionPlan, AsLogicalPlan, BallistaCodec};
+use datafusion::prelude::{ExecutionConfig, ExecutionContext};
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
+use tokio::sync::{mpsc, RwLock};
+use tonic::transport::Channel;
+
+// include the generated protobuf source as a submodule
+#[allow(clippy::all)]
+pub mod externalscaler {
+    include!(concat!(env!("OUT_DIR"), "/externalscaler.rs"));
+}
+
+mod external_scaler;
+mod grpc;
+
+type ExecutorsClient = Arc<RwLock<HashMap<String, ExecutorGrpcClient<Channel>>>>;
+
+#[derive(Clone)]
+pub struct SchedulerServer<T: 'static + AsLogicalPlan, U: 'static + AsExecutionPlan> {
+    pub(crate) state: Arc<SchedulerState<T, U>>,
+    pub start_time: u128,
+    policy: TaskSchedulingPolicy,
+    scheduler_env: Option<SchedulerEnv>,
+    executors_client: Option<ExecutorsClient>,
+    ctx: Arc<RwLock<ExecutionContext>>,
+    codec: BallistaCodec<T, U>,
+}
+
+#[derive(Clone)]
+pub struct SchedulerEnv {
+    pub tx_job: mpsc::Sender<String>,
+}
+
+impl<T: 'static + AsLogicalPlan, U: 'static + AsExecutionPlan> SchedulerServer<T, U> {
+    pub fn new(
+        config: Arc<dyn ConfigBackendClient>,
+        namespace: String,
+        ctx: Arc<RwLock<ExecutionContext>>,
+        codec: BallistaCodec<T, U>,
+    ) -> Self {
+        SchedulerServer::new_with_policy(
+            config,
+            namespace,
+            TaskSchedulingPolicy::PullStaged,
+            None,
+            ctx,
+            codec,
+        )
+    }
+
+    pub fn new_with_policy(
+        config: Arc<dyn ConfigBackendClient>,
+        namespace: String,
+        policy: TaskSchedulingPolicy,
+        scheduler_env: Option<SchedulerEnv>,
+        ctx: Arc<RwLock<ExecutionContext>>,
+        codec: BallistaCodec<T, U>,
+    ) -> Self {
+        let state = Arc::new(SchedulerState::new(config, namespace, codec.clone()));
+
+        let executors_client = if matches!(policy, TaskSchedulingPolicy::PushStaged) {
+            Some(Arc::new(RwLock::new(HashMap::new())))
+        } else {
+            None
+        };
+        Self {
+            state,
+            start_time: SystemTime::now()
+                .duration_since(UNIX_EPOCH)
+                .unwrap()
+                .as_millis(),
+            policy,
+            scheduler_env,
+            executors_client,
+            ctx,
+            codec,
+        }
+    }
+
+    pub async fn init(&self) -> Result<(), BallistaError> {
+        let ctx = self.ctx.read().await;
+        self.state.init(&ctx).await?;
+
+        Ok(())
+    }
+
+    async fn schedule_job(&self, job_id: String) -> Result<(), BallistaError> {
+        let mut available_executors = self.state.get_available_executors_data();
+
+        // In case of there's no enough resources, reschedule the tasks of the job
+        if available_executors.is_empty() {
+            let tx_job = self.scheduler_env.as_ref().unwrap().tx_job.clone();
+            // TODO Maybe it's better to use an exclusive runtime for this kind task scheduling
+            warn!("Not enough available executors for task running");
+            tokio::time::sleep(Duration::from_millis(100)).await;
+            tx_job.send(job_id).await.unwrap();
+            return Ok(());
+        }
+
+        let (tasks_assigment, num_tasks) =
+            self.fetch_tasks(&mut available_executors, &job_id).await?;
+        if num_tasks > 0 {
+            for (idx_executor, tasks) in tasks_assigment.into_iter().enumerate() {
+                if !tasks.is_empty() {
+                    let executor_data = &available_executors[idx_executor];
+                    debug!(
+                        "Start to launch tasks {:?} to executor {:?}",
+                        tasks, executor_data.executor_id
+                    );
+                    let mut client = {
+                        let clients =
+                            self.executors_client.as_ref().unwrap().read().await;
+                        info!("Size of executor clients: {:?}", clients.len());
+                        clients.get(&executor_data.executor_id).unwrap().clone()
+                    };
+                    // Update the resources first
+                    self.state.save_executor_data(executor_data.clone());
+                    // TODO check whether launching task is successful or not
+                    client.launch_task(LaunchTaskParams { task: tasks }).await?;
+                } else {
+                    // Since the task assignment policy is round robin,
+                    // if find tasks for one executor is empty, just break fast
+                    break;
+                }
+            }
+            return Ok(());
+        }
+
+        Ok(())
+    }
+
+    async fn fetch_tasks(
+        &self,
+        available_executors: &mut [ExecutorData],
+        job_id: &str,
+    ) -> Result<(Vec<Vec<TaskDefinition>>, usize), BallistaError> {
+        let mut ret: Vec<Vec<TaskDefinition>> =
+            Vec::with_capacity(available_executors.len());
+        for _idx in 0..available_executors.len() {
+            ret.push(Vec::new());
+        }
+        let mut num_tasks = 0;
+        loop {
+            info!("Go inside fetching task loop");

Review comment:
       realize you didn't add this here, but can we change this to debug level? could add a lot of noise to the logs 




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