I took a look dremio.conf reference.
http://docs.dremio.com/advanced-administration/dremio-conf.html
Some properties are ended with a comma some are not. So is it a typo or expected?
Here I pasted the confused properties
paths: {
# the local path for dremio to store data.
local: "/tmp/dremio",
# the distributed path Dremio data including job results, downloads, uploads, etc
dist: "pdfs://"${paths.local}"/pdfs"
# location for catalog database (if master node)
db: ${paths.local}/db,
spilling: [${paths.local}/spill]