yahoNanJing commented on a change in pull request #1912: URL: https://github.com/apache/arrow-datafusion/pull/1912#discussion_r820368031
########## File path: ballista/rust/scheduler/src/scheduler_server/mod.rs ########## @@ -0,0 +1,142 @@ +// 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::sync::Arc; +use std::time::{SystemTime, UNIX_EPOCH}; + +use tokio::sync::RwLock; +use tonic::transport::Channel; + +use ballista_core::config::{BallistaConfig, TaskSchedulingPolicy}; +use ballista_core::error::Result; +use ballista_core::event_loop::EventLoop; +use ballista_core::serde::protobuf::executor_grpc_client::ExecutorGrpcClient; + +use ballista_core::serde::{AsExecutionPlan, AsLogicalPlan, BallistaCodec}; +use datafusion::prelude::{ExecutionConfig, ExecutionContext}; + +use crate::scheduler_server::event_loop::{ + SchedulerServerEvent, SchedulerServerEventAction, +}; +use crate::state::{ConfigBackendClient, SchedulerState}; + +// include the generated protobuf source as a submodule +#[allow(clippy::all)] +pub mod externalscaler { + include!(concat!(env!("OUT_DIR"), "/externalscaler.rs")); +} + +mod event_loop; +mod external_scaler; +mod grpc; +mod task_scheduler; + +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, + executors_client: Option<ExecutorsClient>, + event_loop: Option<Arc<EventLoop<SchedulerServerEvent>>>, + ctx: Arc<RwLock<ExecutionContext>>, + codec: BallistaCodec<T, U>, +} + +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, + ctx, + codec, + ) + } + + pub fn new_with_policy( + config: Arc<dyn ConfigBackendClient>, + namespace: String, + policy: TaskSchedulingPolicy, + ctx: Arc<RwLock<ExecutionContext>>, + codec: BallistaCodec<T, U>, + ) -> Self { + let state = Arc::new(SchedulerState::new(config, namespace, codec.clone())); + + let (executors_client, event_loop) = + if matches!(policy, TaskSchedulingPolicy::PushStaged) { + let executors_client = Arc::new(RwLock::new(HashMap::new())); + let event_action: Arc<SchedulerServerEventAction<T, U>> = + Arc::new(SchedulerServerEventAction::new( + state.clone(), + executors_client.clone(), + )); + let event_loop = + Arc::new(EventLoop::new("scheduler".to_owned(), 10000, event_action)); + (Some(executors_client), Some(event_loop)) + } else { + (None, None) + }; + Self { + state, + start_time: SystemTime::now() + .duration_since(UNIX_EPOCH) + .unwrap() + .as_millis(), + policy, + executors_client, + event_loop, + ctx, + codec, + } + } + + pub async fn init(&mut self) -> Result<()> { + { + // initialize state + let ctx = self.ctx.read().await; + self.state.init(&ctx).await?; + } + + { + if let Some(event_loop) = self.event_loop.as_mut() { + // It's OK here, since we are sure the mutable reference only be used in the initialization + unsafe { Review comment: Hi @alamb, the reason I prefer not to add Mutex here is that the mutation only happens in the initialization phase. In other places, only it's only for reading. And we can avoid the overhead of locks. @thinkharderdev, this PR is for providing some encapsulation for the channel processing and extracting some common behaviors in the EventLoop. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
