java 11 HttpClient 导致无休止的 SSL 循环

Question

我正在使用 new java.net.http.HttpClient 和 sendAsync 方法。HttpClient 位于 Singelton 中，并且创建一次，如下所示:HttpClient.newBuilder().build() 所以没什么特别的。

这些请求可以是 POST 或 GET 但我不知道是哪个导致了问题。

每天只有几个请求，但有时一个线程会使用 100% 的 cpu 核心。不是立即，而是在请求完成一段时间后。

所以当甚至有 2 个无限循环发生时，我做了一个线程转储，以下 2 个线程脱颖而出:

"HttpClient-4-Worker-5" #144 daemon prio=5 os_prio=0 cpu=511298.10ms elapsed=520.71s tid=0x00007f684403e800 nid=0x2d6b runnable  [0x00007f68ac162000]
   java.lang.Thread.State: RUNNABLE
        at jdk.internal.net.http.common.SSLFlowDelegate$Writer.processData(java.net.http@11.0.2/SSLFlowDelegate.java:771)
        at jdk.internal.net.http.common.SSLFlowDelegate$Writer$WriterDownstreamPusher.run(java.net.http@11.0.2/SSLFlowDelegate.java:645)
        at jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(java.net.http@11.0.2/SequentialScheduler.java:147)
        at jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(java.net.http@11.0.2/SequentialScheduler.java:198)
        at jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(java.net.http@11.0.2/SequentialScheduler.java:271)
        at jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(java.net.http@11.0.2/SequentialScheduler.java:224)
        at jdk.internal.net.http.common.SSLFlowDelegate$Writer.triggerWrite(java.net.http@11.0.2/SSLFlowDelegate.java:722)
        at jdk.internal.net.http.common.SSLFlowDelegate.doHandshake(java.net.http@11.0.2/SSLFlowDelegate.java:1024)
        at jdk.internal.net.http.common.SSLFlowDelegate.doClosure(java.net.http@11.0.2/SSLFlowDelegate.java:1094)
        at jdk.internal.net.http.common.SSLFlowDelegate$Reader.unwrapBuffer(java.net.http@11.0.2/SSLFlowDelegate.java:500)
        at jdk.internal.net.http.common.SSLFlowDelegate$Reader.processData(java.net.http@11.0.2/SSLFlowDelegate.java:389)
        - locked <0x00000000fba68950> (a java.lang.Object)
        at jdk.internal.net.http.common.SSLFlowDelegate$Reader$ReaderDownstreamPusher.run(java.net.http@11.0.2/SSLFlowDelegate.java:263)
        at jdk.internal.net.http.common.SequentialScheduler$SynchronizedRestartableTask.run(java.net.http@11.0.2/SequentialScheduler.java:175)
        - locked <0x00000000fbbca3e8> (a java.lang.Object)
        at jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(java.net.http@11.0.2/SequentialScheduler.java:147)
        at jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(java.net.http@11.0.2/SequentialScheduler.java:198)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.2/ThreadPoolExecutor.java:1128)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.2/ThreadPoolExecutor.java:628)
        at java.lang.Thread.run(java.base@11.0.2/Thread.java:834)

   Locked ownable synchronizers:
        - <0x00000000fc1ff920> (a java.util.concurrent.ThreadPoolExecutor$Worker)





"HttpClient-4-Worker-2" #82 daemon prio=5 os_prio=0 cpu=4266156.67ms elapsed=4311.42s tid=0x00007f6844007000 nid=0x29ee runnable  [0x00007f686fffd000]
   java.lang.Thread.State: RUNNABLE
        at jdk.internal.net.http.common.SSLFlowDelegate$Writer.processData(java.net.http@11.0.2/SSLFlowDelegate.java:771)
        at jdk.internal.net.http.common.SSLFlowDelegate$Writer$WriterDownstreamPusher.run(java.net.http@11.0.2/SSLFlowDelegate.java:645)
        at jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(java.net.http@11.0.2/SequentialScheduler.java:147)
        at jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(java.net.http@11.0.2/SequentialScheduler.java:198)
        at jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(java.net.http@11.0.2/SequentialScheduler.java:271)
        at jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(java.net.http@11.0.2/SequentialScheduler.java:224)
        at jdk.internal.net.http.common.SSLFlowDelegate$Writer.triggerWrite(java.net.http@11.0.2/SSLFlowDelegate.java:722)
        at jdk.internal.net.http.common.SSLFlowDelegate.doHandshake(java.net.http@11.0.2/SSLFlowDelegate.java:1024)
        at jdk.internal.net.http.common.SSLFlowDelegate.doClosure(java.net.http@11.0.2/SSLFlowDelegate.java:1094)
        at jdk.internal.net.http.common.SSLFlowDelegate$Reader.unwrapBuffer(java.net.http@11.0.2/SSLFlowDelegate.java:500)
        at jdk.internal.net.http.common.SSLFlowDelegate$Reader.processData(java.net.http@11.0.2/SSLFlowDelegate.java:389)
        - locked <0x00000000f97668d0> (a java.lang.Object)
        at jdk.internal.net.http.common.SSLFlowDelegate$Reader$ReaderDownstreamPusher.run(java.net.http@11.0.2/SSLFlowDelegate.java:263)
        at jdk.internal.net.http.common.SequentialScheduler$SynchronizedRestartableTask.run(java.net.http@11.0.2/SequentialScheduler.java:175)
        - locked <0x00000000f97668f0> (a java.lang.Object)
        at jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(java.net.http@11.0.2/SequentialScheduler.java:147)
        at jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(java.net.http@11.0.2/SequentialScheduler.java:198)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.2/ThreadPoolExecutor.java:1128)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.2/ThreadPoolExecutor.java:628)
        at java.lang.Thread.run(java.base@11.0.2/Thread.java:834)

   Locked ownable synchronizers:
        - <0x00000000f9894cc0> (a java.util.concurrent.ThreadPoolExecutor$Worker)

相同的观察结果，但在另一个容器上只有一个线程受到影响。

"HttpClient-3-Worker-2" #120 daemon prio=5 os_prio=0 cpu=1100568.51ms elapsed=1113.79s tid=0x00007eff3003b800 nid=0x479 runnable  [0x00007eff83bf8000]
   java.lang.Thread.State: RUNNABLE
        at sun.security.ssl.SSLEngineImpl.wrap(java.base@11.0.1/SSLEngineImpl.java:136)
        - eliminated <0x00000000f9796e08> (a sun.security.ssl.SSLEngineImpl)
        at sun.security.ssl.SSLEngineImpl.wrap(java.base@11.0.1/SSLEngineImpl.java:116)
        - locked <0x00000000f9796e08> (a sun.security.ssl.SSLEngineImpl)
        at javax.net.ssl.SSLEngine.wrap(java.base@11.0.1/SSLEngine.java:519)
        at jdk.internal.net.http.common.SSLFlowDelegate$Writer.wrapBuffers(java.net.http@11.0.1/SSLFlowDelegate.java:821)
        at jdk.internal.net.http.common.SSLFlowDelegate$Writer.processData(java.net.http@11.0.1/SSLFlowDelegate.java:736)
        at jdk.internal.net.http.common.SSLFlowDelegate$Writer$WriterDownstreamPusher.run(java.net.http@11.0.1/SSLFlowDelegate.java:645)
        at jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(java.net.http@11.0.1/SequentialScheduler.java:147)
        at jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(java.net.http@11.0.1/SequentialScheduler.java:198)
        at jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(java.net.http@11.0.1/SequentialScheduler.java:271)
        at jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(java.net.http@11.0.1/SequentialScheduler.java:224)
        at jdk.internal.net.http.common.SSLFlowDelegate$Writer.triggerWrite(java.net.http@11.0.1/SSLFlowDelegate.java:722)
        at jdk.internal.net.http.common.SSLFlowDelegate.doHandshake(java.net.http@11.0.1/SSLFlowDelegate.java:1024)
        at jdk.internal.net.http.common.SSLFlowDelegate.doClosure(java.net.http@11.0.1/SSLFlowDelegate.java:1094)
        at jdk.internal.net.http.common.SSLFlowDelegate$Reader.unwrapBuffer(java.net.http@11.0.1/SSLFlowDelegate.java:500)
        at jdk.internal.net.http.common.SSLFlowDelegate$Reader.processData(java.net.http@11.0.1/SSLFlowDelegate.java:389)
        - locked <0x00000000f9797010> (a java.lang.Object)
        at jdk.internal.net.http.common.SSLFlowDelegate$Reader$ReaderDownstreamPusher.run(java.net.http@11.0.1/SSLFlowDelegate.java:263)
        at jdk.internal.net.http.common.SequentialScheduler$SynchronizedRestartableTask.run(java.net.http@11.0.1/SequentialScheduler.java:175)
        - locked <0x00000000f9797030> (a java.lang.Object)
        at jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(java.net.http@11.0.1/SequentialScheduler.java:147)
        at jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(java.net.http@11.0.1/SequentialScheduler.java:198)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@11.0.1/ThreadPoolExecutor.java:1128)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@11.0.1/ThreadPoolExecutor.java:628)
        at java.lang.Thread.run(java.base@11.0.1/Thread.java:834)

我正在使用的一些示例代码

httpClient.sendAsync(request, HttpResponse.BodyHandlers.ofString())
                                .thenApply(logResponse());

Java 版本

openjdk version "11.0.2" 2019-01-15
OpenJDK Runtime Environment (build 11.0.2+9-Debian-3)
OpenJDK 64-Bit Server VM (build 11.0.2+9-Debian-3, mixed mode, sharing)

当首选 HTTP 2 时也会出现此问题

更新

我是否以错误的方式使用了 HttpClient？这可能是服务器问题吗？可能是这个错误https://bugs.openjdk.java.net/browse/JDK-8207009 ？

• 客户端连接到 cloudflare 服务
• 当问题发生时，没有通过可见的 netstat 与 cloudflare 建立连接
• 我可以将问题归因于 http2 + tlsv1.3(使用 nginx docker 镜像:nginx:1.15-alpine 当然启用了 tls1.3)

根据 https://bugs.openjdk.java.net/browse/JDK-8241054，错误现在似乎已修复

Answer 1

正如@jspcal 在禁用 TLS 1.3 之前所说的那样。

tl;dr:通过扩展/覆盖禁用 tlsv1.3

<java_home>/conf/security/java.security jdk.tls.disabledAlgorithms属性

因为我的应用程序在 docker 容器中运行，所以我更改了基础镜像以禁用 tls1.3

FROM openjdk:11-jre
...

RUN sed -i "/jdk.tls.disabledAlgorithms=/ s/=.*/=TLSv1.3, SSLv3, RC4, MD5withRSA, DH keySize < 1024, EC keySize < 224, DES40_CBC, RC4_40, 3DES_EDE_CBC/" $(readlink -f /usr/bin/java | sed "s:bin/java::")/conf/security/java.security

据我所知，无法通过系统属性设置此(安全)属性!另见 sun.security.util.DisabledAlgorithmConstraints#PROPERTY_TLS_DISABLED_ALGS这实际上准备好了属性(property)。

更新:Bug 在 11.0.2 中仍然存在