xleoken commented on code in PR #2119:
URL:
https://github.com/apache/incubator-celeborn/pull/2119#discussion_r1454685418
##########
master/src/main/scala/org/apache/celeborn/service/deploy/master/Master.scala:
##########
@@ -678,16 +679,9 @@ private[celeborn] class Master(
if (requestSlots.maxWorkers <= 0) slotsAssignMaxWorkers
else Math.min(slotsAssignMaxWorkers, requestSlots.maxWorkers)),
numAvailableWorkers)
- val startIndex = Random.nextInt(numAvailableWorkers)
- val selectedWorkers = new util.ArrayList[WorkerInfo](numWorkers)
- selectedWorkers.addAll(availableWorkers.subList(
- startIndex,
- Math.min(numAvailableWorkers, startIndex + numWorkers)))
- if (startIndex + numWorkers > numAvailableWorkers) {
- selectedWorkers.addAll(availableWorkers.subList(
- 0,
- startIndex + numWorkers - numAvailableWorkers))
- }
+ Collections.rotate(availableWorkers, Random.nextInt(numAvailableWorkers))
+ val selectedWorkers = availableWorkers.subList(0, numWorkers)
+
// offer slots
val slots =
Review Comment:
> And limit to the set outside of [0, numWorkers)
Hi, choose the `[0, numWorkers)` workers as `selectedWorkers`, it not means
we will use all of these workers when offer slots.
##########
master/src/main/scala/org/apache/celeborn/service/deploy/master/Master.scala:
##########
@@ -678,16 +679,9 @@ private[celeborn] class Master(
if (requestSlots.maxWorkers <= 0) slotsAssignMaxWorkers
else Math.min(slotsAssignMaxWorkers, requestSlots.maxWorkers)),
numAvailableWorkers)
- val startIndex = Random.nextInt(numAvailableWorkers)
- val selectedWorkers = new util.ArrayList[WorkerInfo](numWorkers)
- selectedWorkers.addAll(availableWorkers.subList(
- startIndex,
- Math.min(numAvailableWorkers, startIndex + numWorkers)))
- if (startIndex + numWorkers > numAvailableWorkers) {
- selectedWorkers.addAll(availableWorkers.subList(
- 0,
- startIndex + numWorkers - numAvailableWorkers))
- }
+ Collections.rotate(availableWorkers, Random.nextInt(numAvailableWorkers))
Review Comment:
@onebox-li, make sense. In most cases, `numWorkers == numAvailableWorkers`
is true.
```
// select workers from availableWorkers randomly
Collections.rotate(availableWorkers, Random.nextInt(numAvailableWorkers))
val selectedWorkers =
if (numWorkers == numAvailableWorkers) availableWorkers
else availableWorkers.subList(0, numWorkers)
```
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