socket missing on DN

[#1]

Hi,

 after a restart of two DN from the HDFS the Impala daemon refused to start becuase it was not able to access /var/run/hdfs-sockets/dn. I verified the directory, and the socket is not there. I checked other DN hosts and there the socket directory is created. 

I had to start the Impala, so I turned off short circuit reads, but my question is how to re-create these socket directories? Just with a restart of the HDFS? 

Does anybody had a similar experience?

Thanks

CDH5.15

[#2 · Accepted solution]

The DN process was not running, so the restart of the whole HDFS resolved the issue and the directory (socket) was created on every data node

[#3]

Hi Tomas，

Thanks for providing the solution. Can you please accept your findings as the solution so that it would be obvious to other community users?

Cheers