To troubleshoot problems with presto-admin or Presto, you can use the incident report gathering commands from presto-admin to gather logs and other system information from your cluster. Relevant commands:
You can find the
presto-adminlogs in the
You can check the status of Presto on your cluster by using server status.
If Presto is not running and you try to execute any command from the Presto CLI you might get:
$ Error running command: Server refused connection: http://localhost:8080/v1/statement To fix this, start Presto with:
$ ./presto-admin server start
If the Presto servers fail to start or crash soon after starting, look at the presto server logs on the Presto cluster
/var/log/prestofor an error message. You can collect the logs locally using collect logs. The relevant error messages should be at the end of the log with the most recent timestamp. Below are tips for some common errors:
The following error can occur if you do not have passwordless ssh enabled and have not provided a password or if the user requires a sudo password:
Fatal error: Needed to prompt for a connection or sudo password (host: master), but input would be ambiguous in parallel mode
Support for connecting to a cluster with internal HTTPS and/or LDAP communication enabled is experimental. Make sure to check both the Presto server log and the
presto-adminlog to troubleshoot problems with your configuration; it may also be helpful to verify that you can connect to the cluster via the Presto CLI using HTTPS/LDAP as appropriate.