Slot request bulk is not fulfillable，20以上job同时部署失败

基于K8s，在taskmanager中的slot数量足够的情况下，当我的job数量为20以下时，重启JobManager，所有job都可以正常部署运行。
但当我事前准备21个job，此时重启JobManager，会要两三个job一直卡在create状态。
详细报错：

java.util.concurrent.CompletionException: org.apache.flink.runtime.jobmanager.scheduler.NoResourceAvailableException: Slot request bulk is not fulfillable! Could not allocate the required slot within slot request timeout
    at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292)
    at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308)
    at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:607)
    at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:591)
    at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
    at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
    at org.apache.flink.runtime.scheduler.SharedSlot.cancelLogicalSlotRequest(SharedSlot.java:222)
    at org.apache.flink.runtime.scheduler.SlotSharingExecutionSlotAllocator.cancelLogicalSlotRequest(SlotSharingExecutionSlotAllocator.java:164)
    at org.apache.flink.runtime.scheduler.SharingPhysicalSlotRequestBulk.cancel(SharingPhysicalSlotRequestBulk.java:86)
    at org.apache.flink.runtime.jobmaster.slotpool.PhysicalSlotRequestBulkWithTimestamp.cancel(PhysicalSlotRequestBulkWithTimestamp.java:66)
    at org.apache.flink.runtime.jobmaster.slotpool.PhysicalSlotRequestBulkCheckerImpl.lambda$schedulePendingRequestBulkWithTimestampCheck$0(PhysicalSlotRequestBulkCheckerImpl.java:91)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRunAsync(AkkaRpcActor.java:440)
    at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:208)
    at org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:77)
    at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:158)
    at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26)
    at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21)
    at scala.PartialFunction.applyOrElse(PartialFunction.scala:123)
    at scala.PartialFunction.applyOrElse$(PartialFunction.scala:122)
    at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21)
    at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)
    at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172)
    at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172)
    at akka.actor.Actor.aroundReceive(Actor.scala:517)
    at akka.actor.Actor.aroundReceive$(Actor.scala:515)
    at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:225)
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:592)
    at akka.actor.ActorCell.invoke(ActorCell.scala:561)
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258)
    at akka.dispatch.Mailbox.run(Mailbox.scala:225)
    at akka.dispatch.Mailbox.exec(Mailbox.scala:235)
    at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
    at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
    at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
    at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: org.apache.flink.runtime.jobmanager.scheduler.NoResourceAvailableException: Slot request bulk is not fulfillable! Could not allocate the required slot within slot request timeout
    at org.apache.flink.runtime.jobmaster.slotpool.PhysicalSlotRequestBulkCheckerImpl.lambda$schedulePendingRequestBulkWithTimestampCheck$0(PhysicalSlotRequestBulkCheckerImpl.java:86)
    ... 26 more
Caused by: java.util.concurrent.TimeoutException: Timeout has occurred: 600000 ms
    ... 27 more