Change level of detchar data not found logs to warning

gwcelery/tasks/detchar.py

@@ -79,7 +79,7 @@ def create_cache(ifo, start, end):
         cache_endtime = cache_segment[1]
 
     except IndexError:
-        log.exception('Files do not exist in llhoft_glob')
+        log.warning('Files do not exist in llhoft_glob')
         return cache  # returns empty cache
 
     if (cache_starttime <= start) and (end <= cache_endtime):
@@ -96,7 +96,7 @@ def create_cache(ifo, start, end):
     low_latency = app.conf['low_latency_frame_types'][ifo]
     urls = find_urls(ifo[0], low_latency, start, end)
     if not urls:  # required data not in low latency frames
-        log.error('This data cannot be found, or does not exist.')
+        log.warning('This data cannot be found, or does not exist.')
 
     return Cache.from_urls(urls)
 
@@ -328,7 +328,7 @@ def check_idq(cache, channel, start, end):
                 cache, channel, start=start, end=end)
             return (channel, float(idq_fap.min().value))
         except (IndexError, RuntimeError, ValueError):
-            log.exception('Failed to read from low-latency iDQ frame files')
+            log.warning('Failed to read from low-latency iDQ frame files')
     # FIXME: figure out how to get access to low-latency frames outside
     # of the cluster. Until we figure that out, actual I/O errors have
     # to be non-fatal.
@@ -382,7 +382,7 @@ def check_vector(cache, channel, start, end, bits, logic_type='all'):
             statevector = StateVector.read(cache, channel,
                                            start=start, end=end, bits=bits)
         except (IndexError, TypeError, ValueError):
-            log.exception('Failed to read from low-latency frame files')
+            log.warning('Failed to read from low-latency frame files')
         else:
             # FIXME: In the playground environment, the Virgo state vector
             # channel is stored as a float. Is this also the case in the