Github user JackYangzg commented on the issue:
https://github.com/apache/spark/pull/18435
yes, It's only save a reference.
I have read the related code, and It only affect this code
`if (availableCpus(i) >= CPUS_PER_TASK) {
try {
for (task <- taskSet.resourceOffer(execId, host, maxLocality)) {
**tasks(i) += task**
val tid = task.taskId
taskIdToTaskSetManager(tid) = taskSet
taskIdToExecutorId(tid) = execId
executorIdToRunningTaskIds(execId).add(tid)
availableCpus(i) -= CPUS_PER_TASK
assert(availableCpus(i) >= 0)
launchedTask = true
}
}`
obvious, it safe
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