Apparently there is a problem when a syslog cannot be parsed correctly or doesn't have the right keys
As a result the output buffer get stuck
2016-02-06 02:26:20 +0000 [warn]: temporarily failed to flush the buffer. next_retry=2016-02-06 02:41:53 +0000 error_class="InfluxDB::Error" error="{\"error\":\"partial write:\\nunable to parse 'events,pid=1808,message=task_reconfigure\\\\ reinitializing\\\\ done,device=QFX5100,daemon=analyticsd,event= priority=\\\"info\\\",facility=\\\"daemon\\\" 1454724520': missing tag value\\nunable to parse 'events,message=major\\\\ =\\\\ 34\\\\,\\\\ minor\\\\ =\\\\ 2\\\\ \\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\"debug\\\",facility=\\\"local4\\\" 1454724521': invalid tag format\\nunable to parse 'events,message=setsocketopts:\\\\ setting\\\\ SO_RTBL_INDEX\\\\ to\\\\ 0,device=QFX5100,daemon=/kernel,event= priority=\\\"debug\\\",facility=\\\"kern\\\" 1454724521': missing tag value\\nunable to parse 'events,pid=1773,message=task_reconfigure\\\\ reinitializing\\\\ done,device=QFX5100,daemon=l2cpd,event= priority=\\\"info\\\",facility=\\\"daemon\\\" 1454724520': missing tag value\\nunable to parse 'events,message=clksync_phy_driver_enable_tc\\\\ \\\\ \\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\"debug\\\",facility=\\\"local4\\\" 1454724521': missing tag value\\nunable to parse 'events,pid=7844,message=auto-snapshot\\\\ is\\\\ not\\\\ configured,device=QFX5100,daemon=file,event= priority=\\\"debug\\\",facility=\\\"daemon\\\" 1454724520': missing tag value\\nunable to parse 'events,message=pic\\\\ 0x214bb8f8\\\\ enable\\\\ No:\\\\ \\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\"debug\\\",facility=\\\"local4\\\" 1454724521': missing tag value\\nunable to parse 'events,message=total\\\\ ports\\\\ 72\\\\,\\\\ we\\\\ are\\\\ DISABLING\\\\ transparent\\\\ clock\\\\ \\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\"debug\\\",facility=\\\"local4\\\" 1454724521': missing tag value\"}\n" plugin_id="object:c17410"
2016-02-06 02:26:20 +0000 [warn]: suppressed same stacktrace
2016-02-06 02:26:20 +0000 fluent.warn: {"next_retry":"2016-02-06 02:41:53 +0000","error_class":"InfluxDB::Error","error":"{\"error\":\"partial write:\\nunable to parse 'events,pid=1808,message=task_reconfigure\\\\ reinitializing\\\\ done,device=QFX5100,daemon=analyticsd,event= priority=\\\"info\\\",facility=\\\"daemon\\\" 1454724520': missing tag value\\nunable to parse 'events,message=major\\\\ =\\\\ 34\\\\,\\\\ minor\\\\ =\\\\ 2\\\\ \\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\"debug\\\",facility=\\\"local4\\\" 1454724521': invalid tag format\\nunable to parse 'events,message=setsocketopts:\\\\ setting\\\\ SO_RTBL_INDEX\\\\ to\\\\ 0,device=QFX5100,daemon=/kernel,event= priority=\\\"debug\\\",facility=\\\"kern\\\" 1454724521': missing tag value\\nunable to parse 'events,pid=1773,message=task_reconfigure\\\\ reinitializing\\\\ done,device=QFX5100,daemon=l2cpd,event= priority=\\\"info\\\",facility=\\\"daemon\\\" 1454724520': missing tag value\\nunable to parse 'events,message=clksync_phy_driver_enable_tc\\\\ \\\\ \\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\"debug\\\",facility=\\\"local4\\\" 1454724521': missing tag value\\nunable to parse 'events,pid=7844,message=auto-snapshot\\\\ is\\\\ not\\\\ configured,device=QFX5100,daemon=file,event= priority=\\\"debug\\\",facility=\\\"daemon\\\" 1454724520': missing tag value\\nunable to parse 'events,message=pic\\\\ 0x214bb8f8\\\\ enable\\\\ No:\\\\ \\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\"debug\\\",facility=\\\"local4\\\" 1454724521': missing tag value\\nunable to parse 'events,message=total\\\\ ports\\\\ 72\\\\,\\\\ we\\\\ are\\\\ DISABLING\\\\ transparent\\\\ clock\\\\ \\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\"debug\\\",facility=\\\"local4\\\" 1454724521': missing tag value\"}\n","plugin_id":"object:c17410","message":"temporarily failed to flush the buffer. next_retry=2016-02-06 02:41:53 +0000 error_class=\"InfluxDB::Error\" error=\"{\\\"error\\\":\\\"partial write:\\\\nunable to parse 'events,pid=1808,message=task_reconfigure\\\\\\\\ reinitializing\\\\\\\\ done,device=QFX5100,daemon=analyticsd,event= priority=\\\\\\\"info\\\\\\\",facility=\\\\\\\"daemon\\\\\\\" 1454724520': missing tag value\\\\nunable to parse 'events,message=major\\\\\\\\ =\\\\\\\\ 34\\\\\\\\,\\\\\\\\ minor\\\\\\\\ =\\\\\\\\ 2\\\\\\\\ \\\\\\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\\\\\"debug\\\\\\\",facility=\\\\\\\"local4\\\\\\\" 1454724521': invalid tag format\\\\nunable to parse 'events,message=setsocketopts:\\\\\\\\ setting\\\\\\\\ SO_RTBL_INDEX\\\\\\\\ to\\\\\\\\ 0,device=QFX5100,daemon=/kernel,event= priority=\\\\\\\"debug\\\\\\\",facility=\\\\\\\"kern\\\\\\\" 1454724521': missing tag value\\\\nunable to parse 'events,pid=1773,message=task_reconfigure\\\\\\\\ reinitializing\\\\\\\\ done,device=QFX5100,daemon=l2cpd,event= priority=\\\\\\\"info\\\\\\\",facility=\\\\\\\"daemon\\\\\\\" 1454724520': missing tag value\\\\nunable to parse 'events,message=clksync_phy_driver_enable_tc\\\\\\\\ \\\\\\\\ \\\\\\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\\\\\"debug\\\\\\\",facility=\\\\\\\"local4\\\\\\\" 1454724521': missing tag value\\\\nunable to parse 'events,pid=7844,message=auto-snapshot\\\\\\\\ is\\\\\\\\ not\\\\\\\\ configured,device=QFX5100,daemon=file,event= priority=\\\\\\\"debug\\\\\\\",facility=\\\\\\\"daemon\\\\\\\" 1454724520': missing tag value\\\\nunable to parse 'events,message=pic\\\\\\\\ 0x214bb8f8\\\\\\\\ enable\\\\\\\\ No:\\\\\\\\ \\\\\\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\\\\\"debug\\\\\\\",facility=\\\\\\\"local4\\\\\\\" 1454724521': missing tag value\\\\nunable to parse 'events,message=total\\\\\\\\ ports\\\\\\\\ 72\\\\\\\\,\\\\\\\\ we\\\\\\\\ are\\\\\\\\ DISABLING\\\\\\\\ transparent\\\\\\\\ clock\\\\\\\\ \\\\\\\\ ,device=QFX5100,daemon=fpc0,event= priority=\\\\\\\"debug\\\\\\\",facility=\\\\\\\"local4\\\\\\\" 1454724521': missing tag value\\\"}\\n\" plugin_id=\"object:c17410\""}