Vincenzo Galluccio created CAMEL-18871:
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Summary: Application does not recover (threads are WAITING) when
NettyProducer pool is exhausted
Key: CAMEL-18871
URL: https://issues.apache.org/jira/browse/CAMEL-18871
Project: Camel
Issue Type: Bug
Components: camel-netty
Affects Versions: 3.14.7
Reporter: Vincenzo Galluccio
Fix For: 3.14.8
When the Camel Application tries to send a LOT of requests to a TCP/IP Server
(which is not available/down) using Netty component, after a bit, it hangs
because the Producer Pool is exhausted (when *producerPoolMaxTotal* is not -1).
{code:java}
from("direct:start")
.to("netty://tcp://localhost:18667?connectTimeout=500&decoders=#myDecoders&encoders=#myEncoders&producerPoolMaxTotal=10&producerPoolMinEvictableIdle=-1&requestTimeout=250&sync=true");
{code}
In previous version 3.14.1 the behavior was to fail when Pool was exhausted
({*}GenericObjectPool.{*}{*}WHEN_EXHAUSTED_FAIL{*}), however since version
3.14.2 and the migration to `{*}org.apache.commons:commons-pool2{*}`
(https://issues.apache.org/jira/browse/CAMEL-17461) the default has become to
block.
The proposal is to adjust
`[https://github.com/apache/camel/blob/camel-3.14.7/components/camel-netty/src/main/java/org/apache/camel/component/netty/NettyProducer.java]
` , method `doStart()` to add optionally set the *BlockWhenExhausted* flag
(BaseGenericObjectPool.setBlockWhenExhausted) and the *{{borrowMaxWaitMillis}}*
parameters.
{{}}
{code:java}
"Camel Thread #74 - NettyClientTCPWorker" #1166 prio=5 os_prio=0
tid=0x00007fd661a1d800 nid=0x18599 waiting on condition [0x00007fd5ffb12000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000005ce0e8338> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at
org.apache.commons.pool2.impl.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:1323)
at
org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:306)
at
org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:223)
at
org.apache.camel.component.netty.NettyProducer.processWithBody(NettyProducer.java:259)
at
org.apache.camel.component.netty.NettyProducer.process(NettyProducer.java:228)
at
org.apache.camel.processor.SendProcessor.process(SendProcessor.java:172)
at
org.apache.camel.impl.engine.CamelInternalProcessor.process(CamelInternalProcessor.java:398){code}
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