Sreenivas S created HTTPCORE-754:
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Summary: StrictConnPool unable to acquire lock under multi
threaded application causing DeadlineTimeoutException exception being thrown
Key: HTTPCORE-754
URL: https://issues.apache.org/jira/browse/HTTPCORE-754
Project: HttpComponents HttpCore
Issue Type: Bug
Components: HttpCore
Affects Versions: 5.2.2, 5.2
Reporter: Sreenivas S
Under load when two different threads try to get a connection one thread will
be able to get the connection lease and another thread will fail with
misleading *DeadlineTimeoutException* exception.
Exception
[20/Jun/2023:16:08:03-133] [ERROR] - Deadline:
+292278994-08-17T07:12:55.807+0000, 9223370349577492674 MILLISECONDS overdue
org.apache.hc.core5.util.DeadlineTimeoutException: Deadline:
+292278994-08-17T07:12:55.807+0000, 9223370349577492674 MILLISECONDS overdue
at
org.apache.hc.core5.util.DeadlineTimeoutException.from(DeadlineTimeoutException.java:49)
~[httpcore5-5.2.2.jar:5.2.2]
at org.apache.hc.core5.pool.StrictConnPool.lease(StrictConnPool.java:217)
~[httpcore5-5.2.2.jar:5.2.2]
at
org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager$3.<init>(PoolingAsyncClientConnectionManager.java:271)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager.lease(PoolingAsyncClientConnectionManager.java:266)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.InternalHttpAsyncExecRuntime.acquireEndpoint(InternalHttpAsyncExecRuntime.java:105)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.AsyncConnectExec.execute(AsyncConnectExec.java:141)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.AsyncExecChainElement.execute(AsyncExecChainElement.java:54)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.AsyncProtocolExec.internalExecute(AsyncProtocolExec.java:207)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.AsyncProtocolExec.execute(AsyncProtocolExec.java:172)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.AsyncExecChainElement.execute(AsyncExecChainElement.java:54)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.AsyncHttpRequestRetryExec.internalExecute(AsyncHttpRequestRetryExec.java:97)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.AsyncHttpRequestRetryExec.execute(AsyncHttpRequestRetryExec.java:184)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.AsyncExecChainElement.execute(AsyncExecChainElement.java:54)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.InternalAbstractHttpAsyncClient.executeImmediate(InternalAbstractHttpAsyncClient.java:347)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.InternalAbstractHttpAsyncClient.lambda$doExecute$0(InternalAbstractHttpAsyncClient.java:205)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.core5.http.nio.support.BasicRequestProducer.sendRequest(BasicRequestProducer.java:93)
~[httpcore5-5.2.2.jar:5.2.2]
at
org.apache.hc.client5.http.impl.async.InternalAbstractHttpAsyncClient.doExecute(InternalAbstractHttpAsyncClient.java:178)
~[httpclient5-5.2.1.jar:5.2.1]
at
org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient.execute(CloseableHttpAsyncClient.java:97)
~[httpclient5-5.2.1.jar:5.2.1]
DeadlineTimeoutException error is misleading in this case and actually HTTPCore
it is unable to acquire lock (From the exception provided earlier Line 217 of
StrictConnPool.java). Timeout of 0 means don't wait as per java docs of
ReentrantLock. So in my case it looks like already one thread acquired lock and
another thread now trying to acquire lock and as TimeOut value is 0, that
thread is returning back and causing that exception to be thrown. As per
HTTPClient java docs a timeout of 0 to setConnectionRequestTimeout means
infinite timeout.
*Use below code to generate misleading error*
Timeout requestTimeout = Timeout.ZERO_MILLISECONDS;
final Deadline deadline = Deadline.calculate(requestTimeout);
System.out.println(DeadlineTimeoutException.from(deadline));
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