Could anyone please help me how to debug the threads created in ceilometer?

asked 2014-09-19 10:04:59 -0600

Priya gravatar image

I tried debugging ceilometer by setting break-points at its initial stage and launched the service in eclipse. But there was an error message like "error: cannot switch to a different thread". On issuing ps -aef command, there were no other processes forked relevant to the service. And on eclipse, it shows like dummy threads upto 6 has been created. Listed the errored output below.


pydev debugger: starting (pid: 31555) ('Executing file ', '/usr/local/bin/ceilometer-alarm-evaluator') ('arguments:', "['/usr/local/bin/ceilometer-alarm-evaluator']") ('Connecting to ', '', ':', '42178') ('Connected.',) receive cmd <-- CMD_VERSION 501 1 1.1 sending cmd --> CMD_VERSION 501 1 1.1 sending cmd --> CMD_THREAD_CREATE 103 2 <xml><thread name="pydevd.reader" id="-1"/></xml> sending cmd --> CMD_THREAD_CREATE 103 4 <xml><thread name="pydevd.writer" id="-1"/></xml> receive cmd <-- CMD_SET_BREAK 111 3 27 /opt/stack/ceilometer/ceilometer/ 70 FUNCalarm_evaluator None Added breakpoint:/opt/stack/ceilometer/ceilometer/ - line:70 - func_name:alarm_evaluator (id: 27) receive cmd <-- CMD_SET_PY_EXCEPTION 122 5 false;false;false;true; Exceptions to hook : [] receive cmd <-- CMD_SET_PROPERTY_TRACE 124 7
receive cmd <-- CMD_IGNORE_THROWN_EXCEPTION_AT 132 9 REPLACE: receive cmd <-- CMD_ENABLE_DONT_TRACE 133 11 true receive cmd <-- CMD_RUN 101 13
sending cmd --> CMD_THREAD_CREATE 103 6 <xml><thread name="MainThread" id="pid31555_seq2"/></xml> sending cmd --> CMD_THREAD_CREATE 103 8 <xml><thread name="Dummy-5" id="pid31555_seq1"/></xml> sending cmd --> CMD_THREAD_SUSPEND 105 10 <xml><thread id="pid31555_seq1" stop_reason="111"><frame id="140264088344072" name="alarm_evaluator" file="/opt/stack/ceilometer/ceilometer/" line="70">"</frame><frame id="140264389151776" name="&lt;module&gt;" file="/usr/local/bin/ceilometer-alarm-evaluator" line="13">"</frame><frame id="22264912" name="run" file="/home/eclipse/plugins/org.python.pydev_3.6.0.201406232321/pysrc/" line="1373">"</frame><frame id="140264472976320" name="&lt;module&gt;" file="/home/eclipse/plugins/org.python.pydev_3.6.0.201406232321/pysrc/" line="1845">"</frame></thread></xml> Traceback (most recent call last): File "/usr/local/lib/python2.7/dist-packages/eventlet/hubs/", line 346, in fire_timers timer() File "/usr/local/lib/python2.7/dist-packages/eventlet/hubs/", line 58, in __call__ cb(args, kw) File "/usr/local/lib/python2.7/dist-packages/eventlet/", line 121, in _do_acquire waiter.switch() *error: cannot switch to a different thread

Debugging Steps Used:

I have also done many debugging steps, which i have listed as follows:

  • using pydevd
  • using pdb
  • using gdb (when i attach a process and issue "info threads", only one thread is listed)
  • by setting the following values in the elipse file "/home/eclipse/plugins/org.python.pydev_3.6.0.201406232321/pysrc/" DEBUG_TRACE_LEVEL = 3 DEBUG_TRACE_BREAKPOINTS = 3

In whatever way i tried, i am unsuccessful in debugging the threads created in python or switching to the thread process. Is there any other way to do it? Please guide me.

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