配置属性

默认值

dfs. datanode. handler.count

3

dfs. replication. min

1

dfs. namenode. handler. count

10

io. sort. factor

10

io. sort. mb

100

io.sort. record. percent

0.05

io.sort.spill.percent

0.80

mapred. job. tracker. handler. count

10

mapred. map.tasks

2

mapred. reduce. tasks

1

mapred. reduce. parallel. copies

5