thinkharderdev commented on code in PR #153:
URL: https://github.com/apache/arrow-ballista/pull/153#discussion_r954847893


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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 think we would have to implement that as part of this PR or else any 
multi-scheduler deployment would break. 



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