Question

在尝试使用我的群集诊断不同的问题时，我尝试隔离我的环境以强制选举事件。虽然我的应用程序无法以此异常启动，但是在单独启动节点时：

Caused by: java.util.concurrent.TimeoutException: null
    at org.neo4j.cluster.statemachine.StateMachineProxyFactory$ResponseFuture.get(StateMachineProxyFactory.java:300) ~[neo4j-cluster-2.0.1.jar:2.0.1]
    at org.neo4j.cluster.client.ClusterJoin.joinByConfig(ClusterJoin.java:158) ~[neo4j-cluster-2.0.1.jar:2.0.1]
    at org.neo4j.cluster.client.ClusterJoin.start(ClusterJoin.java:91) ~[neo4j-cluster-2.0.1.jar:2.0.1]
    at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:503) ~[neo4j-kernel-2.0.1.jar:2.0.1]
    ... 59 common frames omitted

我的配置设置为60秒加入超时（ha.cluster_join_timeout），以便各个节点可以初始化群集（ha.allow_init_cluster）。

查看来自ClusterJoin类的截断的代码块我相信在一些否定的情况下，代码将循环尝试再次连接，或者当前节点将创建新的集群。

private void joinByConfig() throws TimeoutException
{
    while( true )
        {
            if (config.getClusterJoinTimeout() > 0)
            {
                try
                {
                    console.log( "Joined cluster:" + clusterConfig.get(config.getClusterJoinTimeout(), TimeUnit.MILLISECONDS ));
                    return;
                }
                catch ( InterruptedException e )
                {
                    console.log( "Could not join cluster, interrupted. Retrying..." );
                }
                catch ( ExecutionException e )
                {
                    logger.debug( "Could not join cluster " + this.config.getClusterName() );
                    if ( e.getCause() instanceof IllegalStateException )
                    {
                        throw ((IllegalStateException) e.getCause());
                    }

                    if ( config.isAllowedToCreateCluster() )
                    {
                        // Failed to join cluster, create new one
                        console.log( "Could not join cluster of " + hosts.toString() );
                        console.log( format( "Creating new cluster with name [%s]...", config.getClusterName() ) );
                        cluster.create( config.getClusterName() );
                        break;
                    }

                    console.log( "Could not join cluster, timed out. Retrying..." );
                }
            }

但是TimeoutException不是这些情况之一，实际上joinByConfig方法也会抛出TimeoutException。当等待时间并且没有收到状态机消息时，StateMachineProxyFactory$ResponseFuture类（实现Future）会抛出TimooutException。

public synchronized Object get( long timeout, TimeUnit unit )
            throws InterruptedException, ExecutionException, TimeoutException
    {
        if ( response != null )
        {
            getResult();
        }

        this.wait( unit.toMillis( timeout ) );

        if ( response == null )
        {
            throw new TimeoutException();
        }
        return getResult();
    }

是否应该在加入群集时超时，并且如果配置为初始化群集，则不应传播TimoutException并且应初始化新群集？如果不是这样，那么集群服务器是否必须一致启动？

即使允许创建群集，在Heo4j HA群集中启动第一个节点也会失败

0 个答案: