Kato Kaito created QPID-8788:
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Summary: [Broker-J] Connection close can exceed the configured
timeout under transport backpressure
Key: QPID-8788
URL: https://issues.apache.org/jira/browse/QPID-8788
Project: Qpid
Issue Type: Bug
Components: Broker-J
Affects Versions: qpid-java-broker-10.1.1
Reporter: Kato Kaito
Attachments: threaddump.txt
When an AMQP client stops reading from a native TCP/TLS connection, pending
outgoing data can prevent the broker from completing a connection close
requested through management. The connection can remain open beyond the
configured connection.closeResponseTimeout, retaining resources and delaying
administrative operations that wait for closure. If no other timeout or
transport error intervenes, this can continue indefinitely.
The close request is queued for processing by an I/O worker. Under
backpressure, the transport defers pending protocol work until sufficient
output has drained. Because the close timeout is currently armed only when that
queued close work executes, the request can remain blocked without an active
close deadline. Even when the deadline is armed, its expiry initiates normal
transport shutdown, which can introduce an additional wait for final-write
retries.
The configured timeout should cover both sending the protocol close and waiting
for the peer’s response, starting when closing is requested. Once it expires,
the broker should discard remaining output, close the transport, and release
the associated buffers. Repeated close requests should not extend the deadline.
Reproduced using AMQP 0-9-1 over plain TCP with
connection.closeResponseTimeout=2000. At 30 seconds after requesting closure
through HTTP management, the connection remained ACTIVE, its TCP socket
remained ESTABLISHED, and the management request was still pending. The
attached thread dump shows the management thread waiting in
CompletableFuture.get, reached through AbstractConfiguredObject.delete and
LatestManagementController.delete.
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