A quick question,

cluster config setting will take priority or client setting will take priority in pinot ?

i.e: am setting pinot.broker.timeoutMs = 60000 in broker and server config file itself, but if some clients want to override this setting, can they set at client level a new setting like pinot.broker.timeoutMs = 1200000 and get the query executed ?

Query level timeout takes precedence over cluster level.