I received input on the encore dashboard for a day and then it stopped processing. I see this frequently in the estreamer.log file:
2018-03-27 11:16:35,058 estreamer.client INFO     Process handler state is Error.
2018-03-27 11:16:35,058 estreamer.monitor INFO     Running. 0 subscribed; 0 handled;
2018-03-27 11:16:35,501 estreamer.client INFO     Stopping...
2018-03-27 11:16:36,145 estreamer.subscriber INFO     Stop message received
2018-03-27 11:16:36,146 estreamer.subscriber INFO     Waiting for messageQueue to clear...
2018-03-27 11:16:36,146 estreamer.subscriber INFO     Exiting
2018-03-27 11:16:36,146 estreamer.client INFO     Process 19018 (subscriber) exit code: 0
2018-03-27 11:16:36,146 estreamer.handler INFO     Stop message received
2018-03-27 11:16:36,146 estreamer.handler INFO     Exiting
2018-03-27 11:16:36,147 estreamer.client INFO     Process 19017 (handler) exit code: 0
2018-03-27 11:16:36,147 estreamer.monitor INFO     Stopping Monitor.
2018-03-27 11:16:36,308 estreamer.client INFO     Goodbye
2018-03-27 11:16:37,863 estreamer.client INFO     eNcore version: 3.0.0
2018-03-27 11:16:37,864 estreamer.client INFO     Python version: 2.7.13 (default, Apr 16 2017, 01:25:17) \n[GCC 5.3.0]
2018-03-27 11:16:37,864 estreamer.client INFO     Platform version: Linux-4.4.0-116-generic-x86_64-with-debian-stretch-sid
2018-03-27 11:16:37,864 estreamer.client INFO     Starting client (pid=25163).
2018-03-27 11:16:37,864 estreamer.client INFO     Sha256: xxxxx
2018-03-27 11:16:37,865 Diagnostics  INFO     Check certificate
2018-03-27 11:16:37,865 Diagnostics  INFO     Creating connection
2018-03-27 11:16:37,865 estreamer.connection INFO     Connecting to xxxxx:8302
2018-03-27 11:16:37,865 estreamer.connection INFO     Using TLS v1.2
2018-03-27 11:16:38,108 Diagnostics  INFO     Creating request message
2018-03-27 11:16:38,108 Diagnostics  INFO     Request message=zzzzz
2018-03-27 11:16:38,109 Diagnostics  INFO     Sending request message
2018-03-27 11:16:38,109 Diagnostics  INFO     Receiving response message
2018-03-27 11:16:38,130 Diagnostics  INFO     Response message=zzzzzz
2018-03-27 11:16:38,131 Diagnostics  INFO     Streaming info response
2018-03-27 11:16:38,131 Diagnostics  INFO     Connection successful
2018-03-27 11:16:38,132 estreamer.monitor INFO     Starting Monitor.
2018-03-27 11:16:38,132 estreamer.metadata.cache INFO     Loading cache from /opt/splunk/etc/apps/TA-eStreamer/bin/encore/xxxxx-8302_cache.dat
2018-03-27 11:16:38,133 estreamer.subscriber INFO     Starting Subscriber.
2018-03-27 11:16:38,133 estreamer.connection INFO     Connecting to xxxxx:8302
2018-03-27 11:16:38,134 estreamer.connection INFO     Using TLS v1.2
2018-03-27 11:16:38,135 estreamer.monitor INFO     Starting. 0 subscribed; 0 handled;
2018-03-27 11:16:38,417 estreamer.handler ERROR    ValueError: insecure string pickle\nTraceback (most recent call last):\n  File "/opt/splunk/etc/apps/TA-eStreamer/bin/encore/estreamer/handler.py", line 116, in start\n    self.output = estreamer.outputters.Manager( outputters, self.settings )\n  File "/opt/splunk/etc/apps/TA-eStreamer/bin/encore/estreamer/outputters/manager.py", line 36, in init\n    self.cache.load()\n  File "/opt/splunk/etc/apps/TA-eStreamer/bin/encore/estreamer/metadata/cache.py", line 532, in load\n    data = cPickle.load( cacheFile )\nValueError: insecure string pickle\n
2018-03-27 11:16:38,418 estreamer.handler INFO     Error state. Clearing queue
2018-03-27 11:16:38,619 estreamer.bookmark INFO     Opening bookmark file /opt/splunk/etc/apps/TA-eStreamer/bin/encore/xxxxx-8302_bookmark.dat.
2018-03-27 11:16:38,620 estreamer.settings.settings INFO     Timestamp: Start = 2 (Bookmark = 1521499872)
2018-03-27 11:16:38,623 estreamer.subscriber INFO     EventStreamRequestMessage: 00010002000000085ab03ee048900061
2018-03-27 11:16:38,623 estreamer.bookmark INFO     Opening bookmark file /opt/splunk/etc/apps/TA-eStreamer/bin/encore/xxxxx-8302_bookmark.dat.
2018-03-27 11:16:38,623 estreamer.settings.settings INFO     Timestamp: Start = 2 (Bookmark = 1521499872)
2018-03-27 11:16:38,623 estreamer.subscriber INFO     StreamingRequestMessage: zzzzz
Looking for some troubleshooting assistance.
 
					
				
		
Did you run out of disk space before seeing these exceptions?  The TA seems to show (at least in my case) the above errors after running of disk space, as the data files are getting written to TA-eStreamer/data/encore*.log 
Disable/enable of the TA didn't help after clearning the disk space. I had to stop the instance, remove the bookmark, cache, data, pid files under TA-eStreamer/bin/encore and restart the instance to get new files getting generated and processed.
Oh, thats very helpful to know, thanks. Yeah this is my test splunk server and I blew the disk space at one point, I'll give that a try.
 
					
				
		
Did you run out of disk space before seeing these exceptions?  The TA seems to show (at least in my case) the above errors after running of disk space, as the data files are getting written to TA-eStreamer/data/encore*.log 
Disable/enable of the TA didn't help after clearning the disk space. I had to stop the instance, remove the bookmark, cache, data, pid files under TA-eStreamer/bin/encore and restart the instance to get new files getting generated and processed.
Can you clarify "stop the instance"? You mean the "is enabled?" checkbox in the app setup?
I actually got a save failed error, I'll try to re-install the app this week.
Encountered the following error while trying to update: Splunkd daemon is not responding: (u"Error connecting to /servicesNS/nobody/TA-eStreamer/apps/local/TA-eStreamer/setup: ('The read operation timed out',)",)
on review this was the step that seemed to fix the issue, I think I didn't realize I was having more disk space issues.
