Hi, I recently started working on Hadoop performance metric based tool, i need help to understand the following Hadoop counters:
*CPU* SLOTS_MILLIS_MAPS/SLOTS_MILLIS_REDUCES vs MILLIS_MAPS/MILLIS_REDUCES vs VCORES_MILLIS_MAPS/VCORES_MILLIS_REDUCES vs CPU_MILLISECONDS *Memory*MB_MILLIS_MAPS/MB_MILLIS_REDUCES vs PHYSICAL_MEMORY_BYTES vs VIRTUAL_MEMORY_BYTES 1. Could anyone please explain the differences or point me to a link where i can find above counters details 2. Does VCORES_MILLIS_MAPS reflect total cpu time spent for all map tasks? 3. What are the best metrics to find out cpu/memory usage cost for a job? Thanks in advance for your precious time Regards Afzal
