HTTP/2 connection termination performance

[wtlucy]

An Open Liberty server can experience excess CPU consumption issues when remote HTTP/2 clients do not terminate HTTP/2 connections gracefully. A javacore stack for this issue is similar to the following:

3XMTHREADINFO3           Java callstack:
4XESTACKTRACE                at sun/security/ssl/TransportContext.getHandshakeStatus(TransportContext.java:592(Compiled Code))
4XESTACKTRACE                at sun/security/ssl/SSLEngineImpl.getHandshakeStatus(SSLEngineImpl.java:801(Compiled Code))
5XESTACKTRACE                   (entered lock: sun/security/ssl/SSLEngineImpl@0x00000000FA9CABF0, entry count: 3)
4XESTACKTRACE                at sun/security/ssl/SSLEngineImpl.writeRecord(SSLEngineImpl.java:249(Compiled Code))
4XESTACKTRACE                at sun/security/ssl/SSLEngineImpl.wrap(SSLEngineImpl.java:136(Compiled Code))
5XESTACKTRACE                   (entered lock: sun/security/ssl/SSLEngineImpl@0x00000000FA9CABF0, entry count: 2)
4XESTACKTRACE                at sun/security/ssl/SSLEngineImpl.wrap(SSLEngineImpl.java:116(Compiled Code))
5XESTACKTRACE                   (entered lock: sun/security/ssl/SSLEngineImpl@0x00000000FA9CABF0, entry count: 1)
4XESTACKTRACE                at javax/net/ssl/SSLEngine.wrap(SSLEngine.java:479(Compiled Code))
4XESTACKTRACE                at com/ibm/ws/channel/ssl/internal/SSLUtils.handleHandshake(SSLUtils.java:694(Compiled Code))
4XESTACKTRACE                at com/ibm/ws/channel/ssl/internal/SSLWriteServiceContext.doHandshake(SSLWriteServiceContext.java:648)
4XESTACKTRACE                at com/ibm/ws/channel/ssl/internal/SSLWriteServiceContext.write(SSLWriteServiceContext.java:308)
4XESTACKTRACE                at com/ibm/ws/channel/ssl/internal/SSLWriteServiceContext.write(SSLWriteServiceContext.java:204)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2WriteTree.writeEntry(H2WriteTree.java:254)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2WriteTree.writeOrAddToQ(H2WriteTree.java:168)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2InboundLink.writeSync(H2InboundLink.java:759)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2StreamProcessor.writeFrameSync(H2StreamProcessor.java:1791)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2StreamProcessor.readWriteTransitionState(H2StreamProcessor.java:557)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2StreamProcessor.processNextFrame(H2StreamProcessor.java:506)
5XESTACKTRACE                   (entered lock: com/ibm/ws/http/channel/h2internal/H2StreamProcessor@0x00000000FA97B9B0, entry count: 1)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2StreamProcessor.sendGOAWAYFrame(H2StreamProcessor.java:850)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2InboundLink$H2ConnectionTimeout.run(H2InboundLink.java:1205)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2InboundLink.close(H2InboundLink.java:1162)
5XESTACKTRACE                   (entered lock: com/ibm/ws/http/channel/h2internal/H2InboundLink$1@0x00000000FA97B718, entry count: 1)
4XESTACKTRACE                at com/ibm/wsspi/channelfw/base/InboundApplicationLink.close(InboundApplicationLink.java:105)
4XESTACKTRACE                at com/ibm/ws/http/dispatcher/internal/channel/HttpDispatcherLink.close(HttpDispatcherLink.java:241)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2InboundLink.closeConnectionLink(H2InboundLink.java:962)
4XESTACKTRACE                at com/ibm/ws/http/channel/h2internal/H2MuxTCPReadCallback.error(H2MuxTCPReadCallback.java:102)
4XESTACKTRACE                at com/ibm/ws/channel/ssl/internal/SSLReadServiceContext$SSLReadCompletedCallback.complete(SSLReadServiceContext.java:1825)
4XESTACKTRACE                at com/ibm/ws/tcpchannel/internal/WorkQueueManager.requestComplete(WorkQueueManager.java:503)
4XESTACKTRACE                at com/ibm/ws/tcpchannel/internal/WorkQueueManager.attemptIO(WorkQueueManager.java:573)
4XESTACKTRACE                at com/ibm/ws/tcpchannel/internal/WorkQueueManager.workerRun(WorkQueueManager.java:954)
4XESTACKTRACE                at com/ibm/ws/tcpchannel/internal/WorkQueueManager$Worker.run(WorkQueueManager.java:1043)
4XESTACKTRACE                at com/ibm/ws/threading/internal/ExecutorServiceImpl$RunnableWrapper.run(ExecutorServiceImpl.java:239(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628(Compiled Code))
4XESTACKTRACE                at java/lang/Thread.run(Thread.java:834(Compiled Code))
3XMTHREADINFO3           No native callstack available for this thread