Hello @ganzuoni , Thanks for reaching us out below is your answer: As per the current config you have reached to the limition as CLDR doesnt recommend to have block more than 300M its the dead end and 10M block in each DN but you have 40 M blocks Setting dfs.blockreport.split.threshold to 0 is good plan but does this is causing the slowness please confirm that first while checking "Block report queue is full" in Namenode logs, More-over please check the NN logs for read lock held and write lock held anyone surpassing more than 10sec if yes then read the thread where its stuck, also check out: 1. Any snapshot policy is running 2. Balancer is running 3. Which user is doing which operation mostly in NN audit logs you will find 4. check out the pause if you have any in NN and DN logs, we recommend 1GB for 1M of blocks Suppose in audit logs you find XXX@user is doing 1000's of getfile rpc more than other user then try to stop that job for sometimes to confirm if other speed up.
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