raft主节点状态报错ERROR_TYPE_STATE_MACHINE，该节点所有持久化实例所在的服务变成空，在控制台查不到。其他节点可以查到

[zz630]

主节点A状态报错Error [type=ERROR_TYPE_STATE_MACHINE, status=Status[EBUSY<1009>: FSMCaller is overload.]]
存储使用了ceph，5节点共用一个存储，数据分别存在各自ip的目录下，共2万个持久化实例。一开始参考https://github.com/sofastack/sofa-jraft/issues/472，怀疑是状态机过载。重启该节点后，各节点重新选主，状态正常，数据正常。然后我再注册一个持久化实例，过了一段时间后，新主B所有的持久化实例都查不到了，jraft日志报错.
2022-03-04 12:33:12,870 ERROR Encountered an error=Status[EBUSY<1009>: FSMCaller is overload.] on StateMachine com.alibaba.nacos.cc
ore.distributed.raft.NacosStateMachine, it's highly recommended to implement this method as raft stops working since some error occ
curs, you should figure out the cause and repair or remove this node.

com.alipay.sofa.jraft.error.RaftException: FSMCaller is overload.
at com.alipay.sofa.jraft.core.FSMCallerImpl.enqueueTask(FSMCallerImpl.java:236)
at com.alipay.sofa.jraft.core.FSMCallerImpl.onCommitted(FSMCallerImpl.java:245)
at com.alipay.sofa.jraft.core.BallotBox.commitAt(BallotBox.java:137)
at com.alipay.sofa.jraft.core.Replicator.onAppendEntriesReturned(Replicator.java:1428)
at com.alipay.sofa.jraft.core.Replicator.onRpcReturned(Replicator.java:1258)
at com.alipay.sofa.jraft.core.Replicator$4.run(Replicator.java:1589)
at com.alipay.sofa.jraft.rpc.impl.AbstractClientService$1.complete(AbstractClientService.java:241)
) at java.lang.Thread.run(Thread.java:748).MpscSingleThreadExecutor.lambda$doStartWorker$3(MpscSingleThreadExecutor.java:2633
看到JRaftServer的nodeOptions.setEnableMetrics(true); 但是我没找到metrics输出的地方

• Version [e.g. nacos-server 2.0.3]

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ceph IO较慢，换成本地磁盘后没再遇到该问题