Just a quick note, since I ran into this and now saw a few other people running into the same issue.
If one or more of the storage plugins are not properly configured (especially HBase) it may cause Squirrel to hang/time out when initially connecting to Drill as a data source. A good test is to run show databases in sqlline and if it takes a long time to return it is normally a tell tale sign that one or more of the storage plugins are not configured correctly. I have run into similar issues where other tools may be slow or time out when initially trying to retrieve the metadata form Drill when one or more of the storage plugins are no configured correctly. So if you run into issues where tools that retrieves the metadata from Drill at first connection are timing out or taking a long time, the first step may be to double check the storage plugin configuration. —Andries
