Hello Gautam,

thanks for the answer. And sorry about the delay.

I changed the property and restarted impala service, but the error occured again:

[22/Jul/2015 12:51:27 +0000] 2502 ImpalaDaemonQueryMonitoring throttling_logger ERROR (3318 skipped) Error fetching metrics at 'http://cloudera01-vm.spiegel.de:25000/jsonmetrics?json'
Traceback (most recent call last):
File "/usr/lib64/cmf/agent/src/cmf/monitor/abstract_monitor.py", line 394, in collect_metrics_from_url
result = self.parse_metrics(simplejson.load(openedUrl))
File "/usr/lib64/cmf/agent/build/env/lib/python2.6/site-packages/simplejson-2.1.2-py2.6-linux-x86_64.egg/simplejson/__init__.py", line 328, in load
use_decimal=use_decimal, **kw)
File "/usr/lib64/cmf/agent/build/env/lib/python2.6/site-packages/simplejson-2.1.2-py2.6-linux-x86_64.egg/simplejson/__init__.py", line 384, in loads
return _default_decoder.decode(s)
File "/usr/lib64/cmf/agent/build/env/lib/python2.6/site-packages/simplejson-2.1.2-py2.6-linux-x86_64.egg/simplejson/decoder.py", line 402, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib64/cmf/agent/build/env/lib/python2.6/site-packages/simplejson-2.1.2-py2.6-linux-x86_64.egg/simplejson/decoder.py", line 418, in raw_decode
obj, end = self.scan_once(s, idx)
JSONDecodeError: Expecting property name: line 75 column 19 (char 2309)

But - then i changed the locale from de_DE.UTF-8 to en_US.UTF-8 systemwide (in /etc/sysconfig/i18n) and the impala monitoring works fine!

Thanks for the help

Markus