'Tableau Server Client File Service 0' status is unavailable

Issue

tsm status -v returns the following:

DEGRADED
'Tableau Server Client File Service 0' status is unavailable.

Client File Service (CFS) log shows the following error:

(\clientfileservice_0.2018xxxx\logs\clientfileservice_nodex-0.log.20xxxx):
WARN com.tableausoftware.tdfs.filestore.status.FileStoreStatusServiceHandler - A problem was encountered while building file store status
java.lang.IllegalStateException: Encountered unknown NodeState: ReadOnly

The above conditions may appear even while all other processes are running including Filestore, VizQL and Backgrounder.

Environment

Tableau Server 2018.2 and later

Resolution

The following options can be used to work around the issue:

Option 1:

On the affected node go to services.msc
Restart the Tableau Server Client File Service (even if Tableau Server Client File Service is running).

Option 2:

If it is possible to restart Tableau Server, re-add the CFS to the affected node. Find more information on specific steps in Configure Client File Service.