Niels Ull Harremoes created CAMEL-10024:
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Summary: Race condition in Mina2Producer when closing connections
with disconnect=true
Key: CAMEL-10024
URL: https://issues.apache.org/jira/browse/CAMEL-10024
Project: Camel
Issue Type: Bug
Components: camel-mina2
Affects Versions: 2.17.1
Environment: Tested on Windows using Java 1.8.0_91
Reporter: Niels Ull Harremoes
There is a race condition in the Mina2Producer where connections will not fully
closed in the maybeDisconnectOnDone.
The call to session.close(true) returns a CloseFuture - one must await this to
ensure the session is really closed.
In the current implementation, there is no await on the CloseFuture. This means
that the producer will be returned to the pool before the session is closed. If
the next call comes right after, it is very likely that it will get the same
producer and that the session will suddenly be closed while in use, leading to
errors like
ExchangeTimedOutException: The OUT message was not received within 30000 ms
or
java.lang.IllegalStateException: handler cannot be set while the service is
active.
Here is a small program demonstrating the problem - on my system it will fail
within the first 50 iterations:
{code:java}
import org.apache.camel.*;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.impl.DefaultCamelContext;
import org.slf4j.*;
/**
* Demonstrating race condition
*/
public class Main {
public static void main(String[] args) throws Exception {
System.setProperty("org.slf4j.simpleLogger.log.org.apache.camel.component.mina2.Mina2Producer",
"trace");
System.setProperty("org.slf4j.simpleLogger.log.org.apache.mina.filter.logging.LoggingFilter",
"trace");
Logger logger = LoggerFactory.getLogger(Main.class);
CamelContext context = new DefaultCamelContext();
context.addRoutes(new RouteBuilder() {
@Override
public void configure() throws Exception {
from("mina2:tcp://localhost:20000?sync=true").setBody(simple("Hello
${in.body}"));
}
});
ProducerTemplate producerTemplate = context.createProducerTemplate();
context.start();
try {
for (int i = 0; i < 10000; i++) {
final String body = "world " + i;
logger.info("---- Call # " + i);
String result = (String)
producerTemplate.requestBody("mina2:tcp://localhost:20000?disconnect=true&timeout=1000&sync=true&minaLogger=true",
body);
logger.info("---- End call # " + i);
assert result != null && result.equals("Hello " + body);
}
} finally {
context.stop();
}
}
}
{code}
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