data node long start

[#1]

Hi.

I have cluster with 12 nodes(9 of them with datanodes). 

On each host about 30tb capacity, used on datanodes ~15TB (20Vcores on each and 280gb ram).

After restart one of VM with DN, datanode was started about 1.5 hours.

Is it normal? Or how can i decrease this time.

[#2]

@Yuriy_but 

Absolutely that's not normal. There are a couple of thinks to check the

• Bad disk or corruption.
• Force checkpoint and restart the DN to see the behavior.
• Ensure the NN has enough memory allocated.
• Remove it from the cluster and rejoin afresh after reformating.
• Check the NIC and connectivity.
• Run the balancer to equally distribute the date.