我对使用 Hazelcast 非常陌生，因为它具有与其他缓存实例自动同步的有趣功能。我的查询是描述的底部。
这是我最初的目标：
- 设计一个遵循Hazelcast sidecar 缓存模式的环境。
- 应用程序容器端不会有缓存。基本上，我不想使用“近缓存”来避免我的 JVM 很重并减少 GC 时间。
- 每个Node中的Application Container将通过 localhost IP 与其自己的 sidecar 缓存容器通信。
- Hazelcast 管理中心将是一个单独的节点，它与包含Hazelcast sidecar 缓存容器的所有节点进行通信。
这是目标设计：
我为 Hazelcast 容器准备了 Hazelcast 配置 [hazelcast.yaml]，
hazelcast:
cluster-name: dev
network:
port:
auto-increment: false
port-count: 3
port: 5701
我还为我的应用程序容器准备了另一个 hazelcast.yaml，
hazelcast:
map:
default:
backup-count: 0
async-backup-count: 1
read-backup-data: true
network:
reuse-address: true
port:
auto-increment: true
port: 5701
join:
multicast:
enabled: true
kubernetes:
enabled: false
tcp-ip:
enabled: false
interaface: 127.0.0.1
member-list:
- 127.0.0.1:5701
这是客户端部分，我使用了 SpringBoot。
@Component
public class CacheClient {
private static final String ITEMS = "items";
private HazelcastInstance client;
CacheClient() throws IOException {
ClientConfig config = new YamlClientConfigBuilder("hazelcast.yaml").build();
config.setInstanceName(UUID.randomUUID().toString());
client = HazelcastClient.getOrCreateHazelcastClient(config);
}
public Item put(String number, Item item){
IMap<String, Item> map = client.getMap(ITEMS);
return map.putIfAbsent(number, item);
}
public Item get(String key){
IMap<String, Item> map = client.getMap(ITEMS);
return map.get(key);
}
}
这是dockerfile，我用来构建我的应用程序容器映像，
FROM adoptopenjdk/openjdk11:jdk-11.0.5_10-alpine-slim
# Expose port 8081 to Docker host
EXPOSE 8081
WORKDIR /opt
COPY /build/libs/hazelcast-client-0.0.1-SNAPSHOT.jar /opt/app.jar
COPY /src/main/resources/hazelcast.yaml /opt/hazelcast.yaml
COPY /src/main/resources/application.properties /opt/application.properties
ENTRYPOINT ["java","-Dhazelcast.socket.server.bind.any=false","-Dhazelcast.initial.min.cluster.size=1","-Dhazelcast.socket.bind.any=false","-Dhazelcast.socket.server.bind.any=false","-Dhazelcast.socket.client.bind=false","-Dhazelcast.socket.client.bind.any=false","-Dhazelcast.logging.type=slf4j","-jar","app.jar"]
这是我使用的部署脚本，
apiVersion: v1 # Kubernetes API version
kind: Service # Kubernetes resource kind we are creating
metadata: # Metadata of the resource kind we are creating
name: spring-hazelcast-service
spec:
selector:
app: spring-hazelcast-app
ports:
- protocol: "TCP"
name: http-app
port: 8081 # The port that the service is running on in the cluster
targetPort: 8081 # The port exposed by the service
type: LoadBalancer # type of the service. LoadBalancer indicates that our service will be external.
---
apiVersion: apps/v1
kind: Deployment # Kubernetes resource kind we are creating
metadata:
name: spring-hazelcast-app
spec:
selector:
matchLabels:
app: spring-hazelcast-app
replicas: 1 # Number of replicas that will be created for this deployment
template:
metadata:
labels:
app: spring-hazelcast-app
spec:
containers:
- name: hazelcast
image: hazelcast/hazelcast:4.0.2
workingDir: /opt
ports:
- name: hazelcast
containerPort: 5701
env:
- name: HZ_CLUSTERNAME
value: dev
- name: JAVA_OPTS
value: -Dhazelcast.config=/opt/config/hazelcast.yml
volumeMounts:
- mountPath: "/opt/config/"
name: allconf
- name: spring-hazelcast-app
image: spring-hazelcast:1.0.3
imagePullPolicy: Never #IfNotPresent
ports:
- containerPort: 8081 # The port that the container is running on in the cluster
volumes:
- name: allconf
hostPath:
path: /opt/config/ # directory location on host
type: Directory # this field is optional
---
apiVersion: v1 # Kubernetes API version
kind: Service # Kubernetes resource kind we are creating
metadata: # Metadata of the resource kind we are creating
name: hazelcast-mc-service
spec:
selector:
app: hazelcast-mc
ports:
- protocol: "TCP"
name: mc-app
port: 8080 # The port that the service is running on in the cluster
targetPort: 8080 # The port exposed by the service
type: LoadBalancer # type of the
loadBalancerIP: "127.0.0.1"
---
apiVersion: apps/v1
kind: Deployment # Kubernetes resource kind we are creating
metadata:
name: hazelcast-mc
spec:
selector:
matchLabels:
app: hazelcast-mc
replicas: 1 # Number of replicas that will be created for this deployment
template:
metadata:
labels:
app: hazelcast-mc
spec:
containers:
- name: hazelcast-mc
image: hazelcast/management-center
ports:
- containerPort: 8080 # The port that the container is running on in the cluster
这是我的应用程序日志，
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.5.4)
2021-09-27 06:42:51.274 INFO 1 --- [ main] com.caching.Application : Starting Application using Java 11.0.5 on spring-hazelcast-app-7bdc8b7f7-bqdlt with PID 1 (/opt/app.jar started by root in /opt)
2021-09-27 06:42:51.278 INFO 1 --- [ main] com.caching.Application : No active profile set, falling back to default profiles: default
2021-09-27 06:42:55.986 INFO 1 --- [ main] c.h.c.impl.spi.ClientInvocationService : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2] Running with 2 response threads, dynamic=true
2021-09-27 06:42:56.199 INFO 1 --- [ main] com.hazelcast.core.LifecycleService : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2] HazelcastClient 4.0.2 (20200702 - 2de3027) is STARTING
2021-09-27 06:42:56.202 INFO 1 --- [ main] com.hazelcast.core.LifecycleService : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2] HazelcastClient 4.0.2 (20200702 - 2de3027) is STARTED
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.hazelcast.internal.networking.nio.SelectorOptimizer (jar:file:/opt/app.jar!/BOOT-INF/lib/hazelcast-all-4.0.2.jar!/) to field sun.nio.ch.SelectorImpl.selectedKeys
WARNING: Please consider reporting this to the maintainers of com.hazelcast.internal.networking.nio.SelectorOptimizer
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2021-09-27 06:42:56.277 INFO 1 --- [ main] c.h.c.i.c.ClientConnectionManager : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2] Trying to connect to cluster: dev
2021-09-27 06:42:56.302 INFO 1 --- [ main] c.h.c.i.c.ClientConnectionManager : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2] Trying to connect to [127.0.0.1]:5701
2021-09-27 06:42:56.429 INFO 1 --- [ main] com.hazelcast.core.LifecycleService : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2] HazelcastClient 4.0.2 (20200702 - 2de3027) is CLIENT_CONNECTED
2021-09-27 06:42:56.429 INFO 1 --- [ main] c.h.c.i.c.ClientConnectionManager : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2] Authenticated with server [172.17.0.3]:5701:c967f642-a7aa-4deb-a530-b56fb8f68c78, server version: 4.0.2, local address: /127.0.0.1:54373
2021-09-27 06:42:56.436 INFO 1 --- [ main] c.h.internal.diagnostics.Diagnostics : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2] Diagnostics disabled. To enable add -Dhazelcast.diagnostics.enabled=true to the JVM arguments.
2021-09-27 06:42:56.461 INFO 1 --- [21ad30a.event-4] c.h.c.impl.spi.ClientClusterService : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2]
Members [1] {
Member [172.17.0.3]:5701 - c967f642-a7aa-4deb-a530-b56fb8f68c78
}
2021-09-27 06:42:56.803 INFO 1 --- [ main] c.h.c.i.s.ClientStatisticsService : Client statistics is enabled with period 5 seconds.
2021-09-27 06:42:57.878 INFO 1 --- [ main] c.h.i.config.AbstractConfigLocator : Loading 'hazelcast.yaml' from the working directory.
2021-09-27 06:42:57.934 WARN 1 --- [ main] c.h.i.impl.HazelcastInstanceFactory : Hazelcast is starting in a Java modular environment (Java 9 and newer) but without proper access to required Java packages. Use additional Java arguments to provide Hazelcast access to Java internal API. The internal API access is used to get the best performance results. Arguments to be used:
--add-modules java.se --add-exports java.base/jdk.internal.ref=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.nio=ALL-UNNAMED --add-opens java.base/sun.nio.ch=ALL-UNNAMED --add-opens java.management/sun.management=ALL-UNNAMED --add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED
2021-09-27 06:42:57.976 INFO 1 --- [ main] com.hazelcast.instance.AddressPicker : [LOCAL] [dev] [4.0.2] Prefer IPv4 stack is true, prefer IPv6 addresses is false
2021-09-27 06:42:57.987 INFO 1 --- [ main] com.hazelcast.instance.AddressPicker : [LOCAL] [dev] [4.0.2] Picked [172.17.0.3]:5702, using socket ServerSocket[addr=/172.17.0.3,localport=5702], bind any local is false
2021-09-27 06:42:58.004 INFO 1 --- [ main] com.hazelcast.system : [172.17.0.3]:5702 [dev] [4.0.2] Hazelcast 4.0.2 (20200702 - 2de3027) starting at [172.17.0.3]:5702
2021-09-27 06:42:58.005 INFO 1 --- [ main] com.hazelcast.system : [172.17.0.3]:5702 [dev] [4.0.2] Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
2021-09-27 06:42:58.047 INFO 1 --- [ main] c.h.s.i.o.impl.BackpressureRegulator : [172.17.0.3]:5702 [dev] [4.0.2] Backpressure is disabled
2021-09-27 06:42:58.373 INFO 1 --- [ main] com.hazelcast.instance.impl.Node : [172.17.0.3]:5702 [dev] [4.0.2] Creating MulticastJoiner
2021-09-27 06:42:58.380 WARN 1 --- [ main] com.hazelcast.cp.CPSubsystem : [172.17.0.3]:5702 [dev] [4.0.2] CP Subsystem is not enabled. CP data structures will operate in UNSAFE mode! Please note that UNSAFE mode will not provide strong consistency guarantees.
2021-09-27 06:42:58.676 INFO 1 --- [ main] c.h.s.i.o.impl.OperationExecutorImpl : [172.17.0.3]:5702 [dev] [4.0.2] Starting 2 partition threads and 3 generic threads (1 dedicated for priority tasks)
2021-09-27 06:42:58.682 INFO 1 --- [ main] c.h.internal.diagnostics.Diagnostics : [172.17.0.3]:5702 [dev] [4.0.2] Diagnostics disabled. To enable add -Dhazelcast.diagnostics.enabled=true to the JVM arguments.
2021-09-27 06:42:58.687 INFO 1 --- [ main] com.hazelcast.core.LifecycleService : [172.17.0.3]:5702 [dev] [4.0.2] [172.17.0.3]:5702 is STARTING
2021-09-27 06:42:58.923 INFO 1 --- [ main] c.h.i.cluster.impl.MulticastJoiner : [172.17.0.3]:5702 [dev] [4.0.2] Trying to join to discovered node: [172.17.0.3]:5701
2021-09-27 06:42:58.932 INFO 1 --- [cached.thread-3] c.h.internal.nio.tcp.TcpIpConnector : [172.17.0.3]:5702 [dev] [4.0.2] Connecting to /172.17.0.3:5701, timeout: 10000, bind-any: false
2021-09-27 06:42:58.955 INFO 1 --- [.IO.thread-in-0] c.h.internal.nio.tcp.TcpIpConnection : [172.17.0.3]:5702 [dev] [4.0.2] Initialized new cluster connection between /172.17.0.3:40242 and /172.17.0.3:5701
2021-09-27 06:43:04.948 INFO 1 --- [21ad30a.event-3] c.h.c.impl.spi.ClientClusterService : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2]
Members [2] {
Member [172.17.0.3]:5701 - c967f642-a7aa-4deb-a530-b56fb8f68c78
Member [172.17.0.3]:5702 - 08dfe633-46b2-4581-94c7-81b6d0bc3ce3
}
2021-09-27 06:43:04.959 WARN 1 --- [ration.thread-0] c.h.c.i.operation.OnJoinCacheOperation : [172.17.0.3]:5702 [dev] [4.0.2] This member is joining a cluster whose members support JCache, however the cache-api artifact is missing from this member's classpath. In case JCache API will be used, add cache-api artifact in this member's classpath and restart the member.
2021-09-27 06:43:04.963 INFO 1 --- [ration.thread-0] c.h.internal.cluster.ClusterService : [172.17.0.3]:5702 [dev] [4.0.2]
Members {size:2, ver:2} [
Member [172.17.0.3]:5701 - c967f642-a7aa-4deb-a530-b56fb8f68c78
Member [172.17.0.3]:5702 - 08dfe633-46b2-4581-94c7-81b6d0bc3ce3 this
]
2021-09-27 06:43:05.466 INFO 1 --- [ration.thread-1] c.h.c.i.p.t.AuthenticationMessageTask : [172.17.0.3]:5702 [dev] [4.0.2] Received auth from Connection[id=2, /172.17.0.3:5702->/172.17.0.3:40773, qualifier=null, endpoint=[172.17.0.3]:40773, alive=true, connectionType=JVM], successfully authenticated, clientUuid: 8843f057-c856-4739-80ae-4bc930559bd5, client version: 4.0.2
2021-09-27 06:43:05.468 INFO 1 --- [d30a.internal-3] c.h.c.i.c.ClientConnectionManager : b1bdd9bb-2879-4161-95fd-2b6e321ad30a [dev] [4.0.2] Authenticated with server [172.17.0.3]:5702:08dfe633-46b2-4581-94c7-81b6d0bc3ce3, server version: 4.0.2, local address: /172.17.0.3:40773
2021-09-27 06:43:05.968 INFO 1 --- [ main] com.hazelcast.core.LifecycleService : [172.17.0.3]:5702 [dev] [4.0.2] [172.17.0.3]:5702 is STARTED
2021-09-27 06:43:06.237 INFO 1 --- [ main] o.s.b.web.embedded.netty.NettyWebServer : Netty started on port 8081
2021-09-27 06:43:06.251 INFO 1 --- [ main] com.caching.Application : Started Application in 17.32 seconds (JVM running for 21.02)
这里是 Hazelcast 管理中心成员列表，
最后我的问题是，
- 为什么我看到 2 个成员，其中只部署了一个边车缓存容器？
- 我需要进行哪些修改才能达到我的初始目标？