The issue is resolved.   I replaced the chrony service with the NTP service, according to Michali's recommendation, on all my hosts and all errors stopped. Not only the errors which where explicitely stating "Failed to collect NTP metrics" but also all other errors. Apparently all these errors where somehow related to the inability to collect NTP metrics.   Thank you!     ... View more

Thank you Michalis for your quick response.   Regarding the first issue you mention that it is related to NTP. I use RHEL 7.1 for operating system which uses the chrony service by default instead of NTP. Do you recommend to replace the chrony service with the ntp service?   Regarding the second issue i am providing screenshots from three different services where this issue occurs   a) from the Host Monitor [01/Feb/2016 10:44:34 +0000] 1237 Monitor-GenericMonitor throttling_logger ERROR (8 skipped) Error fetching metrics at 'http://host-hd-01.corp.nodalpoint.com:8086/jmx' Traceback (most recent call last): File "/usr/lib64/cmf/agent/src/cmf/monitor/generic/metric_collectors.py", line 165, in collect_and_parse simplejson.load(opened_url)) File "/usr/lib64/cmf/agent/build/env/lib/python2.7/site-packages/simplejson-2.1.2-py2.7-linux-x86_64.egg/simplejson/__init__.py", line 324, in load return loads(fp.read(), File "/usr/lib64/python2.7/socket.py", line 351, in read data = self._sock.recv(rbufsize) File "/usr/lib64/python2.7/httplib.py", line 567, in read s = self.fp.read(amt) File "/usr/lib64/python2.7/socket.py", line 380, in read data = self._sock.recv(left) error: [Errno 9] Bad file descriptor with its corresponding screenshot     b) from a Yarn Node Manager [01/Feb/2016 10:37:19 +0000] 1363 Monitor-GenericMonitor throttling_logger ERROR (6 skipped) Error fetching metrics at 'http://host-hd-03.corp.nodalpoint.com:8042/jmx' Traceback (most recent call last): File "/usr/lib64/cmf/agent/src/cmf/monitor/generic/metric_collectors.py", line 165, in collect_and_parse simplejson.load(opened_url)) File "/usr/lib64/cmf/agent/build/env/lib/python2.7/site-packages/simplejson-2.1.2-py2.7-linux-x86_64.egg/simplejson/__init__.py", line 324, in load return loads(fp.read(), File "/usr/lib64/python2.7/socket.py", line 351, in read data = self._sock.recv(rbufsize) File "/usr/lib64/python2.7/httplib.py", line 567, in read s = self.fp.read(amt) File "/usr/lib64/python2.7/socket.py", line 380, in read data = self._sock.recv(left) error: [Errno 9] Bad file descriptor with its corresponding screenshot     c) and from the Name Node [01/Feb/2016 10:53:34 +0000] 1237 Monitor-GenericMonitor throttling_logger ERROR (1 skipped) Error fetching metrics at 'http://host-hd-01.corp.nodalpoint.com:8087/jmx' Traceback (most recent call last): File "/usr/lib64/cmf/agent/src/cmf/monitor/generic/metric_collectors.py", line 165, in collect_and_parse simplejson.load(opened_url)) File "/usr/lib64/cmf/agent/build/env/lib/python2.7/site-packages/simplejson-2.1.2-py2.7-linux-x86_64.egg/simplejson/__init__.py", line 324, in load return loads(fp.read(), File "/usr/lib64/python2.7/socket.py", line 351, in read data = self._sock.recv(rbufsize) File "/usr/lib64/python2.7/httplib.py", line 567, in read s = self.fp.read(amt) File "/usr/lib64/python2.7/socket.py", line 380, in read data = self._sock.recv(left) error: [Errno 9] Bad file descriptor with its corresponding screenshot       Please tell me if you require any more information   Thanks again for your support   Filaretos         ... View more