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java - GridDB JAVA API 中的异常

问题描述

我已经在 Ubuntu 上安装了 GridDB。我使用两台计算机：第一台计算机用作 GridDB 服务器，第二台计算机用作 java 客户端，当我尝试从第二台计算机连接到 GridDB 时，它会抛出异常，但是当我在服务器端运行 java 代码时它工作得很好。有什么问题？我使用本教程。

这是简单的java代码：

import java.util.Arrays;
import java.util.Properties;

import com.toshiba.mwcloud.gs.Collection;
import com.toshiba.mwcloud.gs.GSException;
import com.toshiba.mwcloud.gs.GridStore;
import com.toshiba.mwcloud.gs.GridStoreFactory;
import com.toshiba.mwcloud.gs.Query;
import com.toshiba.mwcloud.gs.RowKey;
import com.toshiba.mwcloud.gs.RowSet;


// Operaton on Collection data
public class Sample1 {

    static class Person {
        @RowKey String name;
        boolean status;
        long count;
        byte[] lob;
    }

    public static void main(String[] args) throws GSException {

        // Get a GridStore instance
        Properties props = new Properties();
        props.setProperty("notificationAddress", "239.0.0.1");
        props.setProperty("notificationPort", "31999");
        props.setProperty("clusterName", "defaultCluster");
        props.setProperty("user", "admin");
        props.setProperty("password", "admin");
        GridStore store = GridStoreFactory.getInstance().getGridStore(props);

        // Create a Collection (Delete if schema setting is NULL)
        Collection<String, Person> col = store.putCollection("col01", Person.class);


    }

}

这是例外，当我尝试从第二台计算机连接时：

com.toshiba.mwcloud.gs.common.GSConnectionException: [145028:JC_BAD_CONNECTION] Failed to connect (address=/127.0.1.1:10001, reason=Connection refused: connect)
    at com.toshiba.mwcloud.gs.subnet.NodeConnection.<init>(NodeConnection.java:142)
    at com.toshiba.mwcloud.gs.subnet.NodeConnectionPool.resolve(NodeConnectionPool.java:163)
    at com.toshiba.mwcloud.gs.subnet.NodeResolver.updateConnectionAndClusterInfo(NodeResolver.java:644)
    at com.toshiba.mwcloud.gs.subnet.NodeResolver.prepareConnectionAndClusterInfo(NodeResolver.java:529)
    at com.toshiba.mwcloud.gs.subnet.NodeResolver.getPartitionCount(NodeResolver.java:205)
    at com.toshiba.mwcloud.gs.subnet.GridStoreChannel$5.execute(GridStoreChannel.java:2106)
    at com.toshiba.mwcloud.gs.subnet.GridStoreChannel.executeStatement(GridStoreChannel.java:1675)
    at com.toshiba.mwcloud.gs.subnet.GridStoreChannel.executeResolver(GridStoreChannel.java:1912)
    at com.toshiba.mwcloud.gs.subnet.GridStoreChannel.resolvePartitionId(GridStoreChannel.java:2103)
    at com.toshiba.mwcloud.gs.subnet.SubnetGridStore.putContainer(SubnetGridStore.java:968)
    at com.toshiba.mwcloud.gs.subnet.SubnetGridStore.putCollection(SubnetGridStore.java:1024)
    at com.toshiba.mwcloud.gs.subnet.SubnetGridStore.putCollection(SubnetGridStore.java:787)
    at com.toshiba.mwcloud.gs.subnet.SubnetGridStore.putCollection(SubnetGridStore.java:98)
    at pac.Main.main(Main.java:39)
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at com.toshiba.mwcloud.gs.subnet.NodeConnection.<init>(NodeConnection.java:129)
    ... 13 more

标签： javadatabaseiotin-memory-databasegriddb

解决方案

239.0.0.1 是一个多播地址。并且通常需要对操作系统、路由器设置执行一些额外的步骤才能启用多播。

因此检查是否启用了多播是有意义的：https ://serverfault.com/questions/294207/how-can-i-test-multicast-udp-connectivity-between-two-servers

您还可以检查 GridDB 节点在集群中注册的 IP/端口是否可访问。可以使用以下命令获取 IP 地址：

$ gs_stat -u admin/admin

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