我正在开发一个 Java 应用程序，该应用程序使用 Google Kubernetes 在 Apache Tomcat Docker 容器中部署 Web 工件。我正在使用https://github.com/spotify/docker-client来执行 Docker Image 和 Container 处理活动和https://github.com/fabric8io/fabric8/tree/master/components/kubernetes-api Kubernetes 相关功能。
在此应用程序中，我添加了一项功能，使用户能够删除用户部署的 Web 工件。
删除 I 时，
删除我用来生成所需数量的 pod 副本的 Kubernetes 复制控制器
单独删除副本 pod（因为在 Java API 中的相应方法中删除复制控制器时不会自动删除 pod）
删除掉对应创建的Service
删除删除的 pod 对应的 Docker 容器
最后，删除用于部署的 Docker Image
以下代码显示了实现的删除功能：
public boolean remove(String tenant, String appName) throws WebArtifactHandlerException {
String componentName = generateKubernetesComponentName(tenant, appName);
final int singleImageIndex = 0;
try {
if (replicationControllerHandler.getReplicationController(componentName) != null) {
String dockerImage = replicationControllerHandler.getReplicationController(componentName).getSpec()
.getTemplate().getSpec().getContainers().get(singleImageIndex).getImage();
List<String> containerIds = containerHandler.getRunningContainerIdsByImage(dockerImage);
replicationControllerHandler.deleteReplicationController(componentName);
podHandler.deleteReplicaPods(tenant, appName);
serviceHandler.deleteService(componentName);
Thread.sleep(OPERATION_DELAY_IN_MILLISECONDS);
containerHandler.deleteContainers(containerIds);
imageBuilder.removeImage(tenant, appName, getDockerImageVersion(dockerImage));
return true;
} else {
return false;
}
} catch (Exception exception) {
String message = String.format("Failed to remove web artifact[artifact]: %s",
generateKubernetesComponentName(tenant, appName));
LOG.error(message, exception);
throw new WebArtifactHandlerException(message, exception);
}
}
Docker Container 删除功能的实现如下：
public void deleteContainers(List<String> containerIds) throws WebArtifactHandlerException {
try {
for (String containerId : containerIds) {
dockerClient.removeContainer(containerId);
Thread.sleep(OPERATION_DELAY_IN_MILLISECONDS);
}
} catch (Exception exception) {
String message = "Could not delete the Docker Containers.";
LOG.error(message, exception);
throw new WebArtifactHandlerException(message, exception);
}
}
在上述情况下，尽管所需功能的执行没有任何问题，但在某些情况下，我倾向于得到以下异常。
Sep 11, 2015 3:57:28 PM org.apache.poc.webartifact.WebArtifactHandler remove
SEVERE: Failed to remove web artifact[artifact]: app-wso2-com
org.apache.poc.miscellaneous.exceptions.WebArtifactHandlerException: Could not delete the Docker Containers.
at org.apache.poc.docker.JavaWebArtifactContainerHandler.deleteContainers(JavaWebArtifactContainerHandler.java:80)
at org.apache.poc.webartifact.WebArtifactHandler.remove(WebArtifactHandler.java:206)
at org.apache.poc.Executor.process(Executor.java:222)
at org.apache.poc.Executor.main(Executor.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: com.spotify.docker.client.DockerRequestException: Request error: DELETE unix://localhost:80/v1.12/containers/af05916d2bddf73dcf8bf41c6ea7f5f3b859c90b97447a8248ffa7b5b3968691: 409
at com.spotify.docker.client.DefaultDockerClient.propagate(DefaultDockerClient.java:1061)
at com.spotify.docker.client.DefaultDockerClient.request(DefaultDockerClient.java:1021)
at com.spotify.docker.client.DefaultDockerClient.removeContainer(DefaultDockerClient.java:544)
at com.spotify.docker.client.DefaultDockerClient.removeContainer(DefaultDockerClient.java:535)
at org.wso2.carbon6.poc.docker.JavaWebArtifactContainerHandler.deleteContainers(JavaWebArtifactContainerHandler.java:74)
... 8 more
Caused by: com.spotify.docker.client.shaded.javax.ws.rs.ClientErrorException: HTTP 409 Conflict
at org.glassfish.jersey.client.JerseyInvocation.createExceptionForFamily(JerseyInvocation.java:991)
at org.glassfish.jersey.client.JerseyInvocation.convertToException(JerseyInvocation.java:975)
at org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:795)
at org.glassfish.jersey.client.JerseyInvocation.access$500(JerseyInvocation.java:91)
at org.glassfish.jersey.client.JerseyInvocation$5.completed(JerseyInvocation.java:756)
at org.glassfish.jersey.client.ClientRuntime.processResponse(ClientRuntime.java:189)
at org.glassfish.jersey.client.ClientRuntime.access$300(ClientRuntime.java:74)
at org.glassfish.jersey.client.ClientRuntime$1.run(ClientRuntime.java:171)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:320)
at org.glassfish.jersey.client.ClientRuntime$2.run(ClientRuntime.java:201)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
我搜索了大量资源以寻求任何帮助，但我仍然无法在所有情况下都避免它，我执行了这个功能。
一开始我往往比现在更频繁地遇到这个问题，但是在删除每个 Docker 容器结束时以及在删除任何 Docker 容器之前允许执行线程休眠，逐渐减少了我遇到这个问题的实例数量。
休眠线程是此问题的最终解决方案，还是有任何其他原因导致此问题出现以及可以帮助我避免此异常的解决方案？任何帮助是极大的赞赏。