How do the config variables tserver.readahead.concurrent.max and
tserver.scan.files.open.max interact with BatchScanner threads requested
from the Connector? I have tserver.readahead.concurrent.max set to 64 and
tserver.scan.files.open.max set to 100. However, unless I bump up the
number of BatchScanner threads, I don't see much tserver side parallelism.
If I bump up the number of BatchScanner threads, then I can see multiple
scans per tserver. What governs the number of tserver side threads used to
execute a scan and what prevents too many threads from spinning up to
service multiple concurrent scans from independent clients?
