yahoNanJing commented on code in PR #153:
URL: https://github.com/apache/arrow-ballista/pull/153#discussion_r954918873
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ballista/rust/scheduler/src/state/task_manager.rs:
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@@ -37,16 +37,19 @@ use ballista_core::serde::{AsExecutionPlan, BallistaCodec};
use datafusion::physical_plan::ExecutionPlan;
use datafusion::prelude::SessionContext;
use datafusion_proto::logical_plan::AsLogicalPlan;
-use log::{debug, info, warn};
+#[cfg(not(test))]
+use log::info;
+use log::{debug, error, warn};
use rand::distributions::Alphanumeric;
use rand::{thread_rng, Rng};
-use std::collections::{HashMap, HashSet};
+use std::collections::HashMap;
use std::default::Default;
use std::sync::Arc;
use tokio::sync::RwLock;
use tonic::transport::Channel;
type ExecutorClients = Arc<RwLock<HashMap<String,
ExecutorGrpcClient<Channel>>>>;
+type ExecutionGraphCache = Arc<RwLock<HashMap<String,
Arc<RwLock<ExecutionGraph>>>>>;
#[derive(Clone)]
pub struct TaskManager<T: 'static + AsLogicalPlan, U: 'static +
AsExecutionPlan> {
Review Comment:
I don't think we can achieve multiple scheduler now, since there's only one
scheduler in the executor.
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