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本篇內容主要講解“JVM內存級分布式緩存Hazelcast的應用”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實用性強。下面就讓小編來帶大家學習“JVM內存級分布式緩存Hazelcast的應用”吧!
Hazelcast是一個內存分布式計算平臺，用于管理數據并并行執行執行應用程序。
1. 它是用Java編寫的。
2. 與其他一些內存數據庫(如redis)不同，Hazelcast是多線程的，這意味著可從所有可用的CPU內核中受益。
3. 與其他內存數據網格不同 - 它設計用于分布式環境。它支持每個群集無限數量的map和緩存。
根據基準測試，Hazelcast在獲取數據方面比Redis快56％，在設置數據方面比Redis快44％。
Hazelcast是一個高度可擴展的數據分發和集群平臺。特性包括：
提供java.util.{Queue, Set, List, Map}分布式實現。
提供java.util.concurrency.locks.Lock分布式實現。
提供java.util.concurrent.ExecutorService分布式實現。
提供用于一對多關系的分布式MultiMap。
提供用于發布/訂閱的分布式Topic（主題）。
通過JCA與J2EE容器集成和事務支持。
提供用于安全集群的Socket層加密。
支持同步和異步持久化。
通過JMX監控和管理集群。
支持動態HTTP Session集群。
利用備份實現動態分割。
支持動態故障恢復。
我們來看一下如何使用Hazelcast
pom
<dependency> <groupId>com.hazelcast</groupId> <artifactId>hazelcast-all</artifactId> <version>3.10.1</version></dependency>
在SpringBoot主程序開啟緩存@EnableCaching
@EnableCaching@EnableFeignClients@EnableDiscoveryClient@EnableTransactionManagement@SpringBootApplicationpublic class ProductproviderApplication { public static void main(String[] args) {
ApplicationContext app = SpringApplication.run(ProductproviderApplication.class, args); SpringBootUtil.setApplicationContext(app); }
}配置類
@Configurationpublic class HazelcastConfiguration {@Bean public Config hazelCastConfig(){
Config config = new Config(); config.setInstanceName("hazelcast-instance").addMapConfig(new MapConfig().setName("configuration").setMaxSizeConfig(new MaxSizeConfig(200, MaxSizeConfig.MaxSizePolicy.FREE_HEAP_SIZE)).setEvictionPolicy(EvictionPolicy.LFU)
.setTimeToLiveSeconds(-1)); return config; }
}還是以昨天的汽車配件分類實體類來說明,此處注意一定要實現序列化接口Serializable
@AllArgsConstructor@NoArgsConstructorpublic class ProviderProductLevel implements Provider,Serializable {@Getter @Setter private Long id; @Getter @Setter private String code; @Getter @Setter private String name; @Getter @Setter private Integer sort; @Getter @Setter private Integer level; @Getter @Setter private ProductType productType; @Getter @Setter private String pictureUrl; @Getter @Setter private List<OtherProperty> otherProperties; @Getter private List<Provider> productListProviders = new CopyOnWriteArrayList<>(); public ProviderProductLevel(Long id,String code,String name,Integer sort,ProductType productType) {this.id = id; this.code = code; this.name = name; this.sort = sort; this.level = 1; this.productType = productType; }public ProviderProductLevel(Long id,String code,String name,Integer sort,String pictureUrl) {this.id = id; this.code = code; this.name = name; this.sort = sort; this.level = 2; this.pictureUrl = pictureUrl; }@Override public boolean addProvider(Provider provider) {
LevelDao levelDao = SpringBootUtil.getBean(LevelDao.class); if (provider instanceof ProviderProductLevel) {
levelDao.addLevelToLevel(new ParamLevel(this.id,((ProviderProductLevel)provider).getId())); }return this.productListProviders.add(provider); }}寫一個Controller,其中建立分布式緩存Map，不相關的內容不做解釋，只說明分布式緩存內容
@Slf4j@RestControllerpublic class LevelController {//創建分布式緩存節點 private HazelcastInstance instance = Hazelcast.newHazelcastInstance(); @Autowired private LevelDao levelDao; //一級分類緩存// private Map<Long,Provider> cachelevelMap1 = new ConcurrentHashMap<>(); private Map<Long,Provider> cachelevelMap1 = instance.getMap("level1"); /** * 保存一級汽車配件分類 * @param level * @return */ @ProductAnnotation @SuppressWarnings("unchecked")@Transactional @PostMapping("/productprovider-anon/savelevel1")public Result<String> saveLevel1(@RequestBody ProviderProductLevel level) {
ProviderFactory.createProviderProductLevel1(level,true); if (!cachelevelMap1.containsKey(level.getId())) {cachelevelMap1.put(level.getId(), level); }return Result.success("保存成功"); }/** * 保存二級汽車配件分類，并將二級產品分類添加到一級產品分類的子分類 * @param id * @param level * @return */ @SuppressWarnings("unchecked")@Transactional @PostMapping("/productprovider-anon/savelevel2")public Result<String> saveLevel2(@RequestParam("id") Long id, @RequestBody ProviderProductLevel level) {
ProviderFactory.createProviderProductLevel2(level,true); if (cachelevelMap1.containsKey(id)) {//此處必須獲取一級分類對象，再添加二級分類，然后重新放入緩存中 //直接使用cachelevelMap1.get(id).addProvider(level)，將無法將 //level添加到CopyOnRightArrayList中 Provider level1 = cachelevelMap1.get(id); level1.addProvider(level); cachelevelMap1.put(id,level1); log.info("緩存獲取" + JSONObject.toJSONString(cachelevelMap1.get(id))); }else {
Provider level1 = levelDao.findLevel1(id); log.info(JSONObject.toJSONString(level1)); level1.addProvider(level); cachelevelMap1.put(id,level1); }return Result.success("保存成功"); }@GetMapping("/productprovider-anon/getprovider")public Provider getProvider(@RequestParam("id") Long id) {return cachelevelMap1.get(id); }
}我們將端口號設為8106，并啟動該端口的項目，我們可以看到這樣一些日志
2019-07-10 10:19:38.381 INFO [productprovider,,,] 10216 --- [ main] com.hazelcast.instance.AddressPicker : [LOCAL] [dev] [3.10.1] Prefer IPv4 stack is true.
2019-07-10 10:19:38.764 INFO [productprovider,,,] 10216 --- [ main] com.hazelcast.instance.AddressPicker : [LOCAL] [dev] [3.10.1] Picked [192.168.192.15]:5702, using socket ServerSocket[addr=/0:0:0:0:0:0:0:0,localport=5702], bind any local is true
2019-07-10 10:19:38.765 INFO [productprovider,,,] 10216 --- [ main] com.hazelcast.system : [192.168.192.15]:5702 [dev] [3.10.1] Hazelcast 3.10.1 (20180521 - 66f881d) starting at [192.168.192.15]:5702
2019-07-10 10:19:38.765 INFO [productprovider,,,] 10216 --- [ main] com.hazelcast.system : [192.168.192.15]:5702 [dev] [3.10.1] Copyright (c) 2008-2018, Hazelcast, Inc. All Rights Reserved.
2019-07-10 10:19:38.766 INFO [productprovider,,,] 10216 --- [ main] com.hazelcast.system : [192.168.192.15]:5702 [dev] [3.10.1] Configured Hazelcast Serialization version: 1
2019-07-10 10:19:38.766 INFO [productprovider,,,] 10216 --- [ main] com.hazelcast.instance.Node : [192.168.192.15]:5702 [dev] [3.10.1] A non-empty group password is configured for the Hazelcast member. Starting with Hazelcast version 3.8.2, members with the same group name, but with different group passwords (that do not use authentication) form a cluster. The group password configuration will be removed completely in a future release.
2019-07-10 10:19:38.770 INFO [productprovider,,,] 10216 --- [ main] c.h.s.i.o.impl.BackpressureRegulator : [192.168.192.15]:5702 [dev] [3.10.1] Backpressure is disabled
2019-07-10 10:19:38.770 INFO [productprovider,,,] 10216 --- [ main] h.s.i.o.i.InboundResponseHandlerSupplier : [192.168.192.15]:5702 [dev] [3.10.1] Running with 2 response threads
2019-07-10 10:19:39.422 INFO [productprovider,,,] 10216 --- [ main] com.hazelcast.instance.Node : [192.168.192.15]:5702 [dev] [3.10.1] Creating MulticastJoiner
2019-07-10 10:19:39.428 INFO [productprovider,,,] 10216 --- [ main] c.h.s.i.o.impl.OperationExecutorImpl : [192.168.192.15]:5702 [dev] [3.10.1] Starting 8 partition threads and 5 generic threads (1 dedicated for priority tasks)
2019-07-10 10:19:39.430 INFO [productprovider,,,] 10216 --- [ main] c.h.internal.diagnostics.Diagnostics : [192.168.192.15]:5702 [dev] [3.10.1] Diagnostics disabled. To enable add -Dhazelcast.diagnostics.enabled=true to the JVM arguments.
2019-07-10 10:19:39.430 INFO [productprovider,,,] 10216 --- [ main] com.hazelcast.core.LifecycleService : [192.168.192.15]:5702 [dev] [3.10.1] [192.168.192.15]:5702 is STARTING
2019-07-10 10:19:39.538 INFO [productprovider,,,] 10216 --- [ main] c.h.i.cluster.impl.MulticastJoiner : [192.168.192.15]:5702 [dev] [3.10.1] Trying to join to discovered node: [192.168.192.15]:5701
2019-07-10 10:19:39.549 INFO [productprovider,,,] 10216 --- [cached.thread-3] com.hazelcast.nio.tcp.TcpIpConnector : [192.168.192.15]:5702 [dev] [3.10.1] Connecting to /192.168.192.15:5701, timeout: 0, bind-any: true
2019-07-10 10:19:39.558 INFO [productprovider,,,] 10216 --- [thread-Acceptor] com.hazelcast.nio.tcp.TcpIpAcceptor : [192.168.192.15]:5701 [dev] [3.10.1] Accepting socket connection from /192.168.192.15:4508
2019-07-10 10:19:39.561 INFO [productprovider,,,] 10216 --- [thread-Acceptor] c.h.nio.tcp.TcpIpConnectionManager : [192.168.192.15]:5701 [dev] [3.10.1] Established socket connection between /192.168.192.15:5701 and /192.168.192.15:4508
2019-07-10 10:19:39.561 INFO [productprovider,,,] 10216 --- [cached.thread-3] c.h.nio.tcp.TcpIpConnectionManager : [192.168.192.15]:5702 [dev] [3.10.1] Established socket connection between /192.168.192.15:4508 and /192.168.192.15:5701
2019-07-10 10:19:46.571 INFO [productprovider,,,] 10216 --- [ration.thread-0] c.h.internal.cluster.ClusterService : [192.168.192.15]:5701 [dev] [3.10.1]
Members {size:2, ver:2} [
Member [192.168.192.15]:5701 - 34da2d53-d8d6-4959-aaf2-bd6cda24f0fa this
Member [192.168.192.15]:5702 - 70b959c7-ebb5-4226-b343-76e7354cbd94
]
2019-07-10 10:19:46.584 INFO [productprovider,,,] 10216 --- [ration.thread-0] com.hazelcast.system : [192.168.192.15]:5702 [dev] [3.10.1] Cluster version set to 3.10
2019-07-10 10:19:46.589 INFO [productprovider,,,] 10216 --- [ration.thread-0] c.h.internal.cluster.ClusterService : [192.168.192.15]:5702 [dev] [3.10.1]
Members {size:2, ver:2} [
Member [192.168.192.15]:5701 - 34da2d53-d8d6-4959-aaf2-bd6cda24f0fa
Member [192.168.192.15]:5702 - 70b959c7-ebb5-4226-b343-76e7354cbd94 this
]
2019-07-10 10:19:47.568 INFO [productprovider,,,] 10216 --- [ main] com.hazelcast.core.LifecycleService : [192.168.192.15]:5702 [dev] [3.10.1] [192.168.192.15]:5702 is STARTED
說明它打開了一個5702端口的分布式緩存系統
我們將Springboot的端口改成8006，并啟動該端口的相同項目，我們可以在啟動日志中看到
2019-07-10 10:23:16.328 INFO [productprovider,,,] 11764 --- [ main] com.hazelcast.instance.AddressPicker : [LOCAL] [dev] [3.10.1] Prefer IPv4 stack is true.
2019-07-10 10:23:16.687 INFO [productprovider,,,] 11764 --- [ main] com.hazelcast.instance.AddressPicker : [LOCAL] [dev] [3.10.1] Picked [192.168.192.15]:5704, using socket ServerSocket[addr=/0:0:0:0:0:0:0:0,localport=5704], bind any local is true
2019-07-10 10:23:16.688 INFO [productprovider,,,] 11764 --- [ main] com.hazelcast.system : [192.168.192.15]:5704 [dev] [3.10.1] Hazelcast 3.10.1 (20180521 - 66f881d) starting at [192.168.192.15]:5704
2019-07-10 10:23:16.689 INFO [productprovider,,,] 11764 --- [ main] com.hazelcast.system : [192.168.192.15]:5704 [dev] [3.10.1] Copyright (c) 2008-2018, Hazelcast, Inc. All Rights Reserved.
2019-07-10 10:23:16.689 INFO [productprovider,,,] 11764 --- [ main] com.hazelcast.system : [192.168.192.15]:5704 [dev] [3.10.1] Configured Hazelcast Serialization version: 1
2019-07-10 10:23:16.689 INFO [productprovider,,,] 11764 --- [ main] com.hazelcast.instance.Node : [192.168.192.15]:5704 [dev] [3.10.1] A non-empty group password is configured for the Hazelcast member. Starting with Hazelcast version 3.8.2, members with the same group name, but with different group passwords (that do not use authentication) form a cluster. The group password configuration will be removed completely in a future release.
2019-07-10 10:23:16.692 INFO [productprovider,,,] 11764 --- [ main] c.h.s.i.o.impl.BackpressureRegulator : [192.168.192.15]:5704 [dev] [3.10.1] Backpressure is disabled
2019-07-10 10:23:16.692 INFO [productprovider,,,] 11764 --- [ main] h.s.i.o.i.InboundResponseHandlerSupplier : [192.168.192.15]:5704 [dev] [3.10.1] Running with 2 response threads
2019-07-10 10:23:17.310 INFO [productprovider,,,] 11764 --- [ main] com.hazelcast.instance.Node : [192.168.192.15]:5704 [dev] [3.10.1] Creating MulticastJoiner
2019-07-10 10:23:17.315 INFO [productprovider,,,] 11764 --- [ main] c.h.s.i.o.impl.OperationExecutorImpl : [192.168.192.15]:5704 [dev] [3.10.1] Starting 8 partition threads and 5 generic threads (1 dedicated for priority tasks)
2019-07-10 10:23:17.317 INFO [productprovider,,,] 11764 --- [ main] c.h.internal.diagnostics.Diagnostics : [192.168.192.15]:5704 [dev] [3.10.1] Diagnostics disabled. To enable add -Dhazelcast.diagnostics.enabled=true to the JVM arguments.
2019-07-10 10:23:17.317 INFO [productprovider,,,] 11764 --- [ main] com.hazelcast.core.LifecycleService : [192.168.192.15]:5704 [dev] [3.10.1] [192.168.192.15]:5704 is STARTING
2019-07-10 10:23:17.419 INFO [productprovider,,,] 11764 --- [ main] c.h.i.cluster.impl.MulticastJoiner : [192.168.192.15]:5704 [dev] [3.10.1] Trying to join to discovered node: [192.168.192.15]:5701
2019-07-10 10:23:17.420 INFO [productprovider,,,] 11764 --- [cached.thread-3] com.hazelcast.nio.tcp.TcpIpConnector : [192.168.192.15]:5704 [dev] [3.10.1] Connecting to /192.168.192.15:5701, timeout: 0, bind-any: true
2019-07-10 10:23:17.420 INFO [productprovider,,,] 11764 --- [cached.thread-3] c.h.nio.tcp.TcpIpConnectionManager : [192.168.192.15]:5704 [dev] [3.10.1] Established socket connection between /192.168.192.15:4670 and /192.168.192.15:5701
2019-07-10 10:23:23.427 INFO [productprovider,,,] 11764 --- [ration.thread-2] com.hazelcast.system : [192.168.192.15]:5704 [dev] [3.10.1] Cluster version set to 3.10
2019-07-10 10:23:23.429 INFO [productprovider,,,] 11764 --- [ration.thread-2] c.h.internal.cluster.ClusterService : [192.168.192.15]:5704 [dev] [3.10.1]
Members {size:4, ver:4} [
Member [192.168.192.15]:5701 - 34da2d53-d8d6-4959-aaf2-bd6cda24f0fa
Member [192.168.192.15]:5702 - 70b959c7-ebb5-4226-b343-76e7354cbd94
Member [192.168.192.15]:5703 - 02829ed9-0ddf-4675-ba9e-15c1c03b4a50
Member [192.168.192.15]:5704 - 6ecd17c1-425c-4be0-8914-827f51fdbf3e this
]
2019-07-10 10:23:23.431 INFO [productprovider,,,] 11764 --- [thread-Acceptor] com.hazelcast.nio.tcp.TcpIpAcceptor : [192.168.192.15]:5704 [dev] [3.10.1] Accepting socket connection from /192.168.192.15:4674
2019-07-10 10:23:23.432 INFO [productprovider,,,] 11764 --- [thread-Acceptor] c.h.nio.tcp.TcpIpConnectionManager : [192.168.192.15]:5704 [dev] [3.10.1] Established socket connection between /192.168.192.15:5704 and /192.168.192.15:4674
2019-07-10 10:23:23.436 INFO [productprovider,,,] 11764 --- [ration.thread-0] c.h.internal.cluster.ClusterService : [192.168.192.15]:5703 [dev] [3.10.1]
Members {size:4, ver:4} [
Member [192.168.192.15]:5701 - 34da2d53-d8d6-4959-aaf2-bd6cda24f0fa
Member [192.168.192.15]:5702 - 70b959c7-ebb5-4226-b343-76e7354cbd94
Member [192.168.192.15]:5703 - 02829ed9-0ddf-4675-ba9e-15c1c03b4a50 this
Member [192.168.192.15]:5704 - 6ecd17c1-425c-4be0-8914-827f51fdbf3e
]
2019-07-10 10:23:23.437 INFO [productprovider,,,] 11764 --- [cached.thread-1] com.hazelcast.nio.tcp.TcpIpConnector : [192.168.192.15]:5703 [dev] [3.10.1] Connecting to /192.168.192.15:5704, timeout: 0, bind-any: true
2019-07-10 10:23:23.438 INFO [productprovider,,,] 11764 --- [cached.thread-1] c.h.nio.tcp.TcpIpConnectionManager : [192.168.192.15]:5703 [dev] [3.10.1] Established socket connection between /192.168.192.15:4675 and /192.168.192.15:5704
2019-07-10 10:23:23.438 INFO [productprovider,,,] 11764 --- [thread-Acceptor] com.hazelcast.nio.tcp.TcpIpAcceptor : [192.168.192.15]:5704 [dev] [3.10.1] Accepting socket connection from /192.168.192.15:4675
2019-07-10 10:23:23.439 INFO [productprovider,,,] 11764 --- [thread-Acceptor] c.h.nio.tcp.TcpIpConnectionManager : [192.168.192.15]:5704 [dev] [3.10.1] Established socket connection between /192.168.192.15:5704 and /192.168.192.15:4675
2019-07-10 10:23:23.440 INFO [productprovider,,,] 11764 --- [cached.thread-5] com.hazelcast.nio.tcp.TcpIpConnector : [192.168.192.15]:5704 [dev] [3.10.1] Connecting to /192.168.192.15:5702, timeout: 0, bind-any: true
2019-07-10 10:23:23.444 INFO [productprovider,,,] 11764 --- [cached.thread-5] c.h.nio.tcp.TcpIpConnectionManager : [192.168.192.15]:5704 [dev] [3.10.1] Established socket connection between /192.168.192.15:4676 and /192.168.192.15:5702
2019-07-10 10:23:23.444 INFO [productprovider,,,] 11764 --- [cached.thread-2] com.hazelcast.nio.tcp.TcpIpConnector : [192.168.192.15]:5704 [dev] [3.10.1] Connecting to /192.168.192.15:5703, timeout: 0, bind-any: true
2019-07-10 10:23:23.447 INFO [productprovider,,,] 11764 --- [thread-Acceptor] com.hazelcast.nio.tcp.TcpIpAcceptor : [192.168.192.15]:5703 [dev] [3.10.1] Accepting socket connection from /192.168.192.15:4677
2019-07-10 10:23:23.447 INFO [productprovider,,,] 11764 --- [cached.thread-2] c.h.nio.tcp.TcpIpConnectionManager : [192.168.192.15]:5704 [dev] [3.10.1] Established socket connection between /192.168.192.15:4677 and /192.168.192.15:5703
2019-07-10 10:23:23.447 INFO [productprovider,,,] 11764 --- [thread-Acceptor] c.h.nio.tcp.TcpIpConnectionManager : [192.168.192.15]:5703 [dev] [3.10.1] Established socket connection between /192.168.192.15:5703 and /192.168.192.15:4677
2019-07-10 10:23:24.422 INFO [productprovider,,,] 11764 --- [ main] com.hazelcast.core.LifecycleService : [192.168.192.15]:5704 [dev] [3.10.1] [192.168.192.15]:5704 is STARTED
我們先在8006端口的進程中添加一個一級配件
2019-07-10 10:23:43.408 DEBUG [productprovider,7c69f637b05303a0,7c69f637b05303a0,false] 11764 --- [nio-8006-exec-1] c.c.p.d.L.saveProviderProductLevel1 : ==> Preparing: insert into product_level (id,code,name,sort,level,product_type) values (?,?,?,?,?,?)
2019-07-10 10:23:43.431 DEBUG [productprovider,7c69f637b05303a0,7c69f637b05303a0,false] 11764 --- [nio-8006-exec-1] c.c.p.d.L.saveProviderProductLevel1 : ==> Parameters: 2459048597577007931(Long), 10003(String), 汽車項鏈(String), 3(Integer), 1(Integer), 車品(String)
2019-07-10 10:23:43.454 DEBUG [productprovider,7c69f637b05303a0,7c69f637b05303a0,false] 11764 --- [nio-8006-exec-1] c.c.p.d.L.saveProviderProductLevel1 : <== Updates: 1
然后我們在8106端口進程中添加一個二級汽車配件分類，我們來看一看是否可以獲取一級配件分類的緩存
根據日志打印
2019-07-10 10:26:02.587 DEBUG [productprovider,deca9b0c23fc065f,deca9b0c23fc065f,false] 10216 --- [nio-8106-exec-1] c.c.p.d.L.saveProviderProductLevel2 : ==> Preparing: insert into product_level (id,code,name,sort,level,picture_url) values (?,?,?,?,?,?)
2019-07-10 10:26:02.613 DEBUG [productprovider,deca9b0c23fc065f,deca9b0c23fc065f,false] 10216 --- [nio-8106-exec-1] c.c.p.d.L.saveProviderProductLevel2 : ==> Parameters: 2459048746827121467(Long), 100201(String), 高級項鏈(String), 1(Integer), 2(Integer), sdfasgfd23dg(String)
2019-07-10 10:26:02.635 DEBUG [productprovider,deca9b0c23fc065f,deca9b0c23fc065f,false] 10216 --- [nio-8106-exec-1] c.c.p.d.L.saveProviderProductLevel2 : <== Updates: 1
2019-07-10 10:26:02.664 INFO [productprovider,deca9b0c23fc065f,deca9b0c23fc065f,false] 10216 --- [nio-8106-exec-1] c.c.p.controller.LevelController : 緩存獲取{"code":"10003","id":2459069885582410555,"level":1,"name":"汽車項鏈","productListProviders":[{"code":"100201","id":2459069910278472507,"level":2,"name":"高級項鏈","pictureUrl":"sdfasgfd23dg","productListProviders":[],"sort":1}],"productType":"TYPE2","sort":3}
2019-07-10 10:26:02.666 DEBUG [productprovider,deca9b0c23fc065f,deca9b0c23fc065f,false] 10216 --- [nio-8106-exec-1] c.c.p.dao.LevelDao.addLevelToLevel : ==> Preparing: update product_level set parent_id=? where id=?
2019-07-10 10:26:02.666 DEBUG [productprovider,deca9b0c23fc065f,deca9b0c23fc065f,false] 10216 --- [nio-8106-exec-1] c.c.p.dao.LevelDao.addLevelToLevel : ==> Parameters: 2459048597577007931(Long), 2459048746827121467(Long)
2019-07-10 10:26:02.689 DEBUG [productprovider,deca9b0c23fc065f,deca9b0c23fc065f,false] 10216 --- [nio-8106-exec-1] c.c.p.dao.LevelDao.addLevelToLevel : <== Updates: 1
如果此處一級配件是從數據庫中查出來的，那么此處的日志將不會有緩存獲取4個字，說明該緩存已經同步到了不同進程中。
到此，相信大家對“JVM內存級分布式緩存Hazelcast的應用”有了更深的了解，不妨來實際操作一番吧！這里是億速云網站，更多相關內容可以進入相關頻道進行查詢，關注我們，繼續學習！
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