Created question in FIWARE Q/A platform on 09-05-2016 at 13:05
Please, ANSWER this question AT http://stackoverflow.com/questions/37114255/why-cygnus-crashes-when-using-ngsiv2-in-orion

Question:
Why cygnus crashes when using ngsiv2 in orion?

Description:
Recently I start working with NGSIV2 but cygnus start crashing.
May I have something not cofigurated right? With the v1 works flawless.

My startup trace with the error is in here: http://pastebin.com/nP2am8GW

The error said: Error appending event to channel. Channel might be full. Consider increasing the channel capacity or make sure the sinks perform faster.

time=2016-05-09T05:58:28.866CDT | lvl=WARN | trans=1462791485-602-0000000000 | srv=papel-club | subsrv=events | function=intercept | comp=Cygnus | msg=com.telefonica.iot.cygnus.interceptors.GroupingInterceptor[135] : No context responses within the notified entity, nothing is done
time=2016-05-09T05:58:28.867CDT | lvl=WARN | trans=1462791485-602-0000000000 | srv=papel-club | subsrv=events | function=doPost | comp=Cygnus | msg=org.apache.flume.source.http.HTTPSource$FlumeHTTPServlet[203] : Error appending event to channel. Channel might be full. Consider increasing the channel capacity or make sure the sinks perform faster.
org.apache.flume.ChannelException: Unable to put batch on required channel: org.apache.flume.channel.MemoryChannel

at org.apache.flume.channel.ChannelProcessor.processEventBatch(ChannelProcessor.java:200)
at org.apache.flume.source.http.HTTPSource$FlumeHTTPServlet.doPost(HTTPSource.java:201)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:814)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.IllegalArgumentException: put() called with null event!
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
at org.apache.flume.channel.BasicTransactionSemantics.put(BasicTransactionSemantics.java:89)
at org.apache.flume.channel.BasicChannelSemantics.put(BasicChannelSemantics.java:80)
at org.apache.flume.channel.ChannelProcessor.processEventBatch(ChannelProcessor.java:189)
... 16 more

As error said i increase the channel memory. Here is my agent config:

cygnusagent.sources = http-source
cygnusagent.sinks = ckan-sink
cygnusagent.channels = ckan-channel

cygnusagent.sources.http-source.channels = ckan-channel
cygnusagent.sources.http-source.type = org.apache.flume.source.http.HTTPSource
cygnusagent.sources.http-source.port = 5050
cygnusagent.sources.http-source.handler = com.telefonica.iot.cygnus.handlers.OrionRestHandler
cygnusagent.sources.http-source.handler.notification_target = /notify
cygnusagent.sources.http-source.handler.default_service = papel-club
cygnusagent.sources.http-source.handler.default_service_path = /events
cygnusagent.sources.http-source.handler.events_ttl = 5
cygnusagent.sources.http-source.interceptors = ts gi
cygnusagent.sources.http-source.interceptors.ts.type = timestamp
cygnusagent.sources.http-source.interceptors.gi.type = com.telefonica.iot.cygnus.interceptors.GroupingInterceptor$Builder
cygnusagent.sources.http-source.interceptors.gi.grouping_rules_conf_file = /usr/cygnus/conf/grouping_rules_day.conf

cygnusagent.channels.ckan-channel.type = memory
cygnusagent.channels.ckan-channel.capacity = 100000
cygnusagent.channels.ckan-channel.transactionCapacity = 100000

1. ============================================
2. OrionCKANSink configuration
3. channel name from where to read notification events
   cygnusagent.sinks.ckan-sink.channel = ckan-channel

1. sink class, must not be changed
   cygnusagent.sinks.ckan-sink.type = com.telefonica.iot.cygnus.sinks.OrionCKANSink

1. true if the grouping feature is enabled for this sink, false otherwise
   cygnusagent.sinks.ckan-sink.enable_grouping = true

1. true if lower case is wanted to forced in all the element names, false otherwise
   cygnusagent.sinks.hdfs-sink.enable_lowercase = false

1. the CKAN API key to use
   cygnusagent.sinks.ckan-sink.api_key = xxxx

1. the FQDN/IP address for the CKAN API endpoint
   cygnusagent.sinks.ckan-sink.ckan_host = ckan-demo.ckan.io

1. the port for the CKAN API endpoint
   cygnusagent.sinks.ckan-sink.ckan_port = 80

1. Orion URL used to compose the resource URL with the convenience operation URL to query it
   cygnusagent.sinks.ckan-sink.orion_url = http://localhost:1026

1. how the attributes are stored, either per row either per column (row, column)
   cygnusagent.sinks.ckan-sink.attr_persistence = column

1. enable SSL for secure Http transportation; 'true' or 'false'
   cygnusagent.sinks.ckan-sink.ssl = false

1. number of notifications to be included within a processing batch
   cygnusagent.sinks.ckan-sink.batch_size = 100

1. timeout for batch accumulation
   cygnusagent.sinks.ckan-sink.batch_timeout = 60

1. number of retries upon persistence error
   cygnusagent.sinks.ckan-sink.batch_ttl = 10

Thanks.