Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/10993#discussion_r52503364
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/CoarseMesosSchedulerBackend.scala
---
@@ -73,17 +73,13 @@ private[spark] class CoarseMesosSchedulerBackend(
private val shuffleServiceEnabled =
conf.getBoolean("spark.shuffle.service.enabled", false)
// Cores we have acquired with each Mesos task ID
- val coresByTaskId = new HashMap[Int, Int]
+ val coresByTaskId = new HashMap[String, Int]
var totalCoresAcquired = 0
- val slaveIdsWithExecutors = new HashSet[String]
-
- // Maping from slave Id to hostname
- private val slaveIdToHost = new HashMap[String, String]
-
- val taskIdToSlaveId: HashBiMap[Int, String] = HashBiMap.create[Int,
String]
- // How many times tasks on each slave failed
- val failuresBySlaveId: HashMap[String, Int] = new HashMap[String, Int]
+ // SlaveID -> Slave
+ // This map accumulates entries for the duration of the job. Slaves are
never deleted, because
+ // we need to maintain e.g. failure state and connection state.
+ private val slaves = new HashMap[String, Slave]
--- End diff --
elsewhere in Spark we would call this class `SlaveInfo` instead of just
`Slave`, so we don't confuse it with the Mesos Slave
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