Question

我正在尝试使用谓词通过Hazelcast-client（Node Js）实现NoSql解决方案。

我正在创建如下用户地图：


    function generateUsers(users) {
        return users.put('Rod', new User('Rod', 19, true)).then(function () {
            var usertemp={
                username: "Jane",
                age: 20,
                active: true
            };
            //return users.put('Jane', new User('Jane', 20, true));
            return users.put('Jane', usertemp);
        }).then(function () {
            var usertemp={
                username: "Freddy",
                age: 23,
                active: true
            };
            return users.put('Freddy', usertemp);
        }).then(function(){
            var usertemp={
                username: "test",
                age: 20,
                active: false
            };
           //var usertemp2= new User('Test',20,true);
            users.put('test',usertemp);
            console.log("after put");
            console.log("Userdata:"+users);
            return users;
        });
    }

当我尝试使用谓词查询map中的条目时，它给出了例外，以下是我使用谓词查询Map的代码


    var JsonSerializer = /** @class */ (function () {
        function JsonSerializer() {
        }
        JsonSerializer.prototype.getId = function () {
            return 1;
        };
        JsonSerializer.prototype.read = function (input) {
            return JSON.parse(input.readUTF());
        };
        JsonSerializer.prototype.write = function (output, object) {
            output.writeUTF(JSON.stringify(object));
        };
        return JsonSerializer;
    }());

    var cfg = new Config.ClientConfig();
    cfg.serializationConfig.customSerializers =[new JsonSerializer(),];
    cfg.serializationConfig.portableFactories[1] = new PortableFactory();
    // Start the Hazelcast Client and connect to an already running Hazelcast Cluster on 127.0.0.1
    Client.newHazelcastClient(cfg).then(function (hz) {
        // Get a Distributed Map called "users"
        var users = hz.getMap('users');
        // Add some users to the Distributed Map
        return generateUsers(users).then(function () {
            // Create a Predicate
            var criteriaQuery = Predicates.and(
                Predicates.truePredicate('active', true),
                Predicates.isBetween('age', 18, 21)
            );
            // Get result collections using the the Predicate
            console.log("before valuesWithPredicate");
            return users.valuesWithPredicate(criteriaQuery);
        }).then(function (values) {
            // Print out the results
            console.log(values.toArray());
            // Shutdown this Hazelcast Client
            hz.shutdown();
        })
    });

以下是例外：


    Unhandled rejection Error: There is no suitable de-serializer for type -130. This exception is likely to be caused by differences in the serialization configuration between members or between clients and members.

> NOTE: I've Tried adding customSerializer JsonSerializer  in HazelcastClient config

Edit1：我错过了hazlecast服务器控制台，似乎我们需要在hazlecast服务器上配置类似的Serializer，以下是例外情况

<pre>
SEVERE: [10.8.162.33]:5701 [dev] [3.10.5] There is no suitable de-serializer for type -130. This exception is likely to be caused by differences in the serialization configuration between members or between clients and members.
com.hazelcast.nio.serialization.HazelcastSerializationException: There is no suitable de-serializer for type -130. This exception is likely to be caused by differences in the serialization configuration between members or between clients and members.
        at com.hazelcast.internal.serialization.impl.AbstractSerializationService.newHazelcastSerializationException(AbstractSerializationService.java:238)
        at com.hazelcast.internal.serialization.impl.AbstractSerializationService.toObject(AbstractSerializationService.java:182)
        at com.hazelcast.query.impl.CachedQueryEntry.getValue(CachedQueryEntry.java:75)
        at com.hazelcast.query.impl.CachedQueryEntry.getTargetObject(CachedQueryEntry.java:108)
        at com.hazelcast.query.impl.QueryableEntry.extractAttributeValue(QueryableEntry.java:81)
        at com.hazelcast.query.impl.QueryableEntry.getAttributeValue(QueryableEntry.java:48)
        at com.hazelcast.query.impl.predicates.AbstractPredicate.readAttributeValue(AbstractPredicate.java:132)
        at com.hazelcast.query.impl.predicates.AbstractPredicate.apply(AbstractPredicate.java:57)
        at com.hazelcast.query.impl.predicates.AndPredicate.apply(AndPredicate.java:136)
        at com.hazelcast.map.impl.query.PartitionScanRunner.run(PartitionScanRunner.java:97)
        at com.hazelcast.map.impl.query.CallerRunsPartitionScanExecutor.execute(CallerRunsPartitionScanExecutor.java:42)
        at com.hazelcast.map.impl.query.QueryRunner.runPartitionScanQueryOnGivenOwnedPartition(QueryRunner.java:172)
        at com.hazelcast.map.impl.query.QueryPartitionOperation.run(QueryPartitionOperation.java:45)
        at com.hazelcast.spi.Operation.call(Operation.java:148)
        at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.call(OperationRunnerImpl.java:202)
        at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.run(OperationRunnerImpl.java:191)
        at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.process(OperationThread.java:120)
        at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.run(OperationThread.java:100)

但是不幸的是，我无法在hazlecast.xml中在服务器端找到类似的JSONSerializer进行配置

Answer 1

-130是为Hazelcast Node.js客户端保留的序列化ID。 Hazelcast服务器目前不支持本机JSON序列化，但计划在下一个版本中使用：https://www.infoq.com/news/2018/08/hazelcast-new-ceo

我们还计划引入新的数据结构，使用SQL Select和JDBC增强查询，并为面向文档的系统添加本机JSON支持。因此比以往任何时候都更加忙碌。

作为解决方法，可以对复杂对象使用Portable序列化。您需要在客户端和服务器端都编写自己的序列化器。然后，服务器应该能够查询您的对象。请记住，您需要为序列化程序使用正序列化ID。负ID保留给内部序列化器使用，不能被覆盖。

www.hazelcast.org有一个很好的示例，用于实现可移植序列化。只需在Portable Serializer和Java Member标签下查找Node.js示例。

在JsonSerializer Hazelcast客户端上需要帮助

1 个答案: