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[SPARK-26446][CORE] Add cachedExecutorIdleTimeout docs at ExecutorAllocationManager #23386

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[SPARK-26446][CORE] Add cachedExecutorIdleTimeout docs at ExecutorAllocationManager #23386

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10 changes: 8 additions & 2 deletions core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,8 @@ import org.apache.spark.util.{Clock, SystemClock, ThreadUtils, Utils}
* a long time to ramp up under heavy workloads.
*
* The remove policy is simpler: If an executor has been idle for K seconds, meaning it has not
* been scheduled to run any tasks, then it is removed.
* been scheduled to run any tasks, then it is removed. Note that an executor caching any data
* blocks will be removed if it has been idle for more than L seconds.
*
* There is no retry logic in either case because we make the assumption that the cluster manager
* will eventually fulfill all requests it receives asynchronously.
Expand All @@ -81,7 +82,12 @@ import org.apache.spark.util.{Clock, SystemClock, ThreadUtils, Utils}
* This is used only after the initial backlog timeout is exceeded
*
* spark.dynamicAllocation.executorIdleTimeout (K) -
* If an executor has been idle for this duration, remove it
* If an executor without caching any data blocks has been idle for this duration, remove it
*
* spark.dynamicAllocation.cachedExecutorIdleTimeout (L) -
* If an executor with caching data blocks has been idle for more than this duration,
* the executor will be removed
*
*/
private[spark] class ExecutorAllocationManager(
client: ExecutorAllocationClient,
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