Hadoop Configuration parameters

Parameter	File	Default	Diagram(s)
`mapreduce.task.io.sort.mb`	`mapred-site.xml`	100	MapTask > Shuffle
			MapTask > Execution
`mapreduce.map.sort.spill.percent`	`mapred-site.xml`	0.80	MapTask > Shuffle
			MapTask > Execution
`mapreduce.task.io.sort.factor`	`mapred-site.xml`	100	MapTask > Shuffle
			Merge
			ReduceTask > Shuffle
`mapreduce.map.combine.minspills`	`mapred-site.xml`	3	MapTask > Shuffle
`mapreduce.job.reduces`	`mapred-site.xml`	1	MapTask > Shuffle
		0	Job > NEW => INITED
`mapreduce.cluster.local.dir`	`mapred-site.xml`	`${hadoop.tmp.dir}`/mapred/local	MapTask > Shuffle
`mapreduce.reduce.merge.memtomem.enabled`	`mapred-site.xml`	False	Reduce Task > Shuffle
`mapreduce.framework.name`	`mapred-site.xml`	`yarn`/`local`	Reduce Task > Shuffle
`mapreduce.reduce.shuffle.parallelcopies`	`mapred-site.xml`	5	Reduce Task > Shuffle
`mapreduce.reduce.memory.totalbytes`	`mapred-site.xml`	`Runtime.maxMemory()`	Reduce Task > Fetcher
`mapreduce.reduce.shuffle.memory.limit.percent`	`mapred-site.xml`	0.25	Reduce Task > Fetcher
`mapreduce.job.ubertask.enable`	`mapred-site.xml`	False	Job > NEW => INITED
`mapreduce.job.ubertask.maxmaps`	`mapred-site.xml`	9	Job > NEW => INITED
`mapreduce.job.ubertask.maxreduces`	`mapred-site.xml`	1	Job > NEW => INITED
`mapreduce.job.ubertask.maxbytes`	`mapred-site.xml`	`dfs.block.size`	Job > NEW => INITED
`mapreduce.map. failures.maxpercent`	`mapred-site.xml`	0	Job > RUNNING => {RUNNING, COMMITTING, FAIL ABORT}
`mapreduce.reduce. failures.maxpercent`	`mapred-site.xml`	0	Job > RUNNING => {RUNNING, COMMITTING, FAIL ABORT}
`mapreduce.map.memory.mb`	`mapred-site.xml`	1024	Task Attempt > NEW => UNASSIGNED
`mapreduce.reduce.memory.mb`	`mapred-site.xml`	1024	Task Attempt > NEW => UNASSIGNED
`scheduler.maximum-allocation-mb`	`yarn-site.xml`	8192	Container Allocator
`mapreduce.reduce.shuffle.merge.percent`	`mapred-site.xml`	0.90	Reduce Task > Shuffle
`yarn.resourcemanager.scheduler.class`	`yarn-site.xml`	`CapacityScheduler`	Resource Manager