# Analysis of Write Bottleneck (4/6)

+ Why is the append log/apply log operation slow?
  + Check whether it is caused by the slow write in RocksDB. (The write duration in RocksDB-kv corresponds to that for the apply log operation; the write duration in RocksDB-raft corresponds to that for the append log operation.)



![`smart`](place-holder.png)

![`smart`](place-holder.png)

![`smart`](place-holder.png)

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