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The possible exceptions relating to event receivers that may occur are as follows:

Queue full exception

Sample Error log
event for endpoint group [ ( Receiver URL : tcp://das-1.-prod.local:7611, Authentication URL : ssl://das-1.amway-prod.local:7711),( Receiver URL : tcp://das-2.amway-prod.local:7611, Authentication URL : ssl://das-2.-prod.local:7711) ], 139882 events dropped so far. {org.wso2.carbon.databridge.agent.DataPublisher}
TID: [-1] [] [2017-05-23 00:05:53,708] ERROR
{org.wso2.carbon.databridge.agent.endpoint.DataEndpoint} - Unable to send events to the endpoint. {org.wso2.carbon.databridge.agent.endpoint.DataEndpoint}
org.wso2.carbon.databridge.agent.exception.DataEndpointException: Cannot send Events
OccurrenceThis occurs on the client side when using the WSO2Event event receiver.
Possible reasons
  • The TCP connection between the databridge client and the DAS server may not be established.
  • The performance of WSO2 DAS may not be tuned to handle the event load sent by the databridge client.
  • If the database is an RDBMS database such as MySQL, this exception can occur due to limited capacity.
Troubleshooting options

To check the TCP connection, enable event tracing and event logs, and make sure that one or more events are published to WSO2 DAS.
To enable event tracing, see Event Tracer.
To enable event logging, see Logger Event Publisher.

Recommended action
  • To check the database persistence and database receiver rate, the following properties can be set when the DAS server is started:
    • -DprofileReceiver=true:This enables you to check the throughput per receiver. This creates the receiver-perf.txt file in the DAS_HOME. The throughput is calculated and published in this file for every 100000 events.
    • -DprofilePersistence=true: This allows you to check the throughput at the persistence (i.e., Data Access Layer) level. This creates the persistence-perf.txt file in the DAS_HOME.
    • -DpersistenceStatsCutoff=1000: This property specifies the number of events for which the persistence-perf.txt file generated via the -DprofilePersistence property is updated. If this property is not set, 100000 is considered the default number.
  • NoSQL databases such as HBase are recommended for high throughput environments to avoid this exception.


Dropping incorrectly formatted events

Exception
wso2carbon.log:114:TID: [-1234] [] [2017-03-31 00:00:01,155] ERROR {org.wso2.carbon.databridge.core.internal.queue.QueueWorker} -  Dropping wrongly formatted event sent for -1234 {org.wso2.carbon.databridge.core.internal.queue.QueueWorker}
wso2carbon.log-115-org.wso2.carbon.databridge.core.exception.EventConversionException: Error when converting 1 of event bundle with events 6
wso2carbon.log-116-	at org.wso2.carbon.databridge.receiver.thrift.converter.ThriftEventConverter.createEventList(ThriftEventConverter.java:181)
OccurrenceThis may occur when you publish events to WSO2 DAS before or after starting the DAS server.
Possible reasons
  • If this exception occurs for events that were sent before the DAS server start-up, it can be due to a delay in the deployment of one or more artifacts deployed via CAR files.
  • If this exception occurs for events that are sent after the DAS server start-up, it is because the relevant event stream is not defined or deployed in WSO2 DAS. For more information about event streams, see Understanding Event Streams and Event Tables.
Troubleshooting optionsGo to the <DAS_HOME>/repository/deployment/server/eventstreams directory and check whether the required event stream definition exists.
Recommended actionEnsure that the required event streams are defined/deployed.



Troubleshooting WSO2Event Receivers using databridge debug logs

org.wso2.carbon.databridge.core.internal.queue.QueueWorker provides debug logs which can be enabled in DAS management console.

To enable databridge debug logs, follow the steps given below.

  1. Go to Home → Configure → Logging
  2. Filter logger by 'org.wso2.carbon.databridge.core.internal.queue'
  3. Set log level to 'DEBUG'

  Under above configuration, following information will be logged.

  • <size of event queue> + " messages in queue before " + <name of the current thread> + " worker has polled queue ".
  • "Dispatching event to " + <number of subscribers> + " subscriber(s) ".
  • <size of event queue> + " messages in queue after " + <name of the current thread> + " worker has finished work ".



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