在UMP系统中,Zookeeper主要发挥的作用。
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请论述HDFS中SecondaryNameNode的作用和工作原理。
Which system is a control system of ductless glands that secrete hormones within specific organs:
A. digestive
B. endocrine
C. nervous
D. urinary
The small gland in the brain that controls other glands is the:
A. adrenal
B. thymus
C. pituitary
D. corpus luteum