即使是不适用于集群的简单查询（“请求未在rpc_timeout内完成”）

Question

我已经成功建立了一个包含7个节点的Cassandra集群。但是，我无法让它用于基本查询。

CREATE TABLE lgrsettings (
  siteid bigint,
  channel int,
  name text,
  offset float,
  scalefactor float,
  units text,
  PRIMARY KEY (siteid, channel)
)

insert into lgrsettings (siteid,channel,name,offset,scalefactor,units) values (999,1,'Flow',0.0,1.0,'m');

然后在一个节点上：

select * from lgrsettings;

Request did not complete within rpc_timeout.

另一个：

select * from lgrsettings;
Bad Request: unconfigured columnfamily lgrsettings

即使键空间和列族显示在所有节点上。

我可以开始寻找任何想法吗？

亚历

有趣的结果。处理密钥空间创建和插入的节点显示：

Keyspace: testdata
    Read Count: 0
    Read Latency: NaN ms.
    Write Count: 2
    Write Latency: 0.304 ms.
    Pending Tasks: 0
            Column Family: lgrsettings
            SSTable count: 0
            Space used (live): 0
            Space used (total): 0
            Number of Keys (estimate): 0
            Memtable Columns Count: 10
            Memtable Data Size: 129
            Memtable Switch Count: 0
            Read Count: 0
            Read Latency: NaN ms.
            Write Count: 2
            Write Latency: NaN ms.
            Pending Tasks: 0
            Bloom Filter False Positives: 0
            Bloom Filter False Ratio: 0.00000
            Bloom Filter Space Used: 0
            Compacted row minimum size: 0
            Compacted row maximum size: 0
            Compacted row mean size: 0

            Column Family: datapoints
            SSTable count: 0
            Space used (live): 0
            Space used (total): 0
            Number of Keys (estimate): 0
            Memtable Columns Count: 0
            Memtable Data Size: 0
            Memtable Switch Count: 0
            Read Count: 0
            Read Latency: NaN ms.
            Write Count: 0
            Write Latency: NaN ms.
            Pending Tasks: 0
            Bloom Filter False Positives: 0
            Bloom Filter False Ratio: 0.00000
            Bloom Filter Space Used: 0
            Compacted row minimum size: 0
            Compacted row maximum size: 0
            Compacted row mean size: 0

其他节点在cfstats中没有这个，但是在DESCRIBE KEYSPACE testdata中显示它;在CQL3客户端......

Answer 1

请求未在rpc_timeout

内完成

检查您的Cassandra日志以确认是否存在任何问题 - 有时Cassandra中的例外情况会导致客户端超时。

Answer 2

在评论中，OP说他找到了问题的原因：

  

我设法解决了这个问题。这是由于节点之间的时间同步，所以我在所有节点上安装了ntpd，等了5分钟再次尝试，我有一个工作集群！