Race condition in RSS feed-writer component
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Key: SM-1061
URL: https://issues.apache.org/activemq/browse/SM-1061
Project: ServiceMix
Issue Type: Bug
Components: servicemix-components
Affects Versions: 3.1.1, 3.1
Environment: ServiceMix 3.1.1, Java 1.5.0_6
Reporter: Jeff Peterson
Priority: Critical
Attachments: feedwriter.patch
We are using ServiceMix to create a RSS feed from XML documents flowing across
the bus and have run across a synchronization problem with the FeedWriter.java
class. We are using the eip:xpath-splitter component to feed the
FeedWriter.java RSS component are a seeing messages either dropped and/or the
feed file getting corrupted with invalid documents. From the ServiceMix log we
see individual threads processing each FeedWriter input message and have placed
"synchronization" inside the FeedWriter.java process( ) method and
getCachedFeed( ) method to correct this problem.
Log snippet:
15:03:58,197 | DEBUG | pool-flow.seda.feedWriter-thread-2 | FeedWriter
| emix.components.rss.FeedWriter 198 | Enter process() MESSAGE
15:03:58,478 | DEBUG | pool-flow.seda.feedWriter-thread-1 | DeliveryChannelImpl
| .messaging.DeliveryChannelImpl 413 | Send
ID:134.120.209.157-1151f534169-4:3 in DeliveryChannel{feedWriter}
15:03:58,478 | DEBUG | pool-flow.seda.feedWriter-thread-1 | SedaFlow
| emix.jbi.nmr.flow.AbstractFlow 121 | Called Flow send
15:03:58,478 | DEBUG | pool-flow.seda.feedWriter-thread-1 | FeedWriter
| emix.components.rss.FeedWriter 206 | Exit process() MESSAGE
15:03:58,478 | DEBUG | pool-flow.seda.feedWriter-thread-2 | DeliveryChannelImpl
| .messaging.DeliveryChannelImpl 413 | Send
ID:134.120.209.157-1151f534169-4:4 in DeliveryChannel{feedWriter}
15:03:58,478 | DEBUG | pool-flow.seda.feedWriter-thread-2 | SedaFlow
| emix.jbi.nmr.flow.AbstractFlow 121 | Called Flow send
15:03:58,478 | DEBUG | pool-flow.seda.feedWriter-thread-2 | FeedWriter
| emix.components.rss.FeedWriter 206 | Exit process() MESSAGE
15:03:58,478 | DEBUG | pool-flow.seda.feedWriter-thread-3 | SedaQueue
| .jbi.nmr.flow.seda.SedaQueue$1 132 | [EMAIL PROTECTED] dequeued
exchange: InOnly[
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