Hive memory stuffing

We have an hdp cluster 2.6.5, hive service is installed with HA

3 Hive server

3 Metastores

1 HiveServer2 Interactive

1 WebHCat Server

We are receiving "memory high usage" alerts from our monitoring tool, when i check the memory consumption on that nodes i can see that hive is consuming more than 80% of memory node

When memory usage reach 98%, the hive server crash with the following error message

[root@mnode4 hive]# head -n 20 hs_err_pid27508.log
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 1732247552 bytes for committing reserved memory.
# Possible reasons:
#   The system is out of physical RAM or swap space
#   In 32 bit mode, the process size limit was hit
# Possible solutions:
#   Reduce memory load on the system
#   Increase physical memory or swap space
#   Check if swap backing store is full
#   Use 64 bit Java on a 64 bit OS
#   Decrease Java heap size (-Xmx/-Xms)
#   Decrease number of Java threads
#   Decrease Java thread stack sizes (-Xss)
#   Set larger code cache with -XX:ReservedCodeCacheSize=
# This output file may be truncated or incomplete.
#
#  Out of Memory Error (os_linux.cpp:2627), pid=27508, tid=0x00007f43152a3700
#
# JRE version: Java(TM) SE Runtime Environment (8.0_112-b15) (build 1.8.0_112-b15)

htop give the bellow view

Why all these process are created ? How to reduce memory usage ?