Question

这是我在机器上设置3节点Cassandra集群的第二次尝试。我无法启动第一个实例。在启动期间我得到了

Exception encountered during startup
org.apache.cassandra.exceptions.ConfigurationException: Invalid yaml: file:/home/user1/TestCluster/node1/dsc-cassandra-2.2.8/conf/cassandra.yaml

以及我无法理解的很多行（我不明白为什么yaml无效）。

我的方法包括以下步骤：

我将tarball安装解压缩到3个文件夹中（因为我想要3个实例）。
在每个cassandra.yaml中：
- cluster_name已设置
- seeds:“127.0.0.2”（所有节点都相同）
- rpc_address, listen_address都设置为127.0.0.2-4
- rpc_port已设置（9160,9161,9162）
- data_file_directories，commitlog_directories，saved_caches_directory已为所有
在每个cassandra-env.sh JMX_PORT已设置（8081,8082,8083）

etc/hosts，以便127.2-4是127.0.0.1的别名

我的问题是：我做错了什么？怎么解决这个问题？在ubuntu上有没有其他简单的方法可以做到这一点？

我包含错误，因为它有任何意义。如果占用太多空间，将删除。

ERROR 12:19:12 Exception encountered during startup
org.apache.cassandra.exceptions.ConfigurationException: Invalid yaml: file:/home/user1/TestCluster/node1/dsc-cassandra-2.2.8/conf/cassandra.yaml
    at org.apache.cassandra.config.YamlConfigurationLoader.loadConfig(YamlConfigurationLoader.java:118) ~[apache-cassandra-2.2.8.jar:2.2.8]
    at org.apache.cassandra.config.YamlConfigurationLoader.loadConfig(YamlConfigurationLoader.java:85) ~[apache-cassandra-2.2.8.jar:2.2.8]
    at org.apache.cassandra.config.DatabaseDescriptor.loadConfig(DatabaseDescriptor.java:135) ~[apache-cassandra-2.2.8.jar:2.2.8]
    at org.apache.cassandra.config.DatabaseDescriptor.<clinit>(DatabaseDescriptor.java:119) ~[apache-cassandra-2.2.8.jar:2.2.8]
    at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:507) [apache-cassandra-2.2.8.jar:2.2.8]
    at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:641) [apache-cassandra-2.2.8.jar:2.2.8]
Caused by: org.yaml.snakeyaml.constructor.ConstructorException: null; Can't construct a java object for tag:yaml.org,2002:org.apache.cassandra.config.Config; exception=Cannot create property=data_file_directories for JavaBean=org.apache.cassandra.config.Config@24a35978; No single argument constructor found for class [Ljava.lang.String;;  in 'reader', line 10, column 1:
    cluster_name: 'Testcluster'
    ^
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:333) ~[snakeyaml-1.11.jar:na]
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:182) ~[snakeyaml-1.11.jar:na]
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:141) ~[snakeyaml-1.11.jar:na]
    at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:127) ~[snakeyaml-1.11.jar:na]
    at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:481) ~[snakeyaml-1.11.jar:na]
    at org.yaml.snakeyaml.Yaml.loadAs(Yaml.java:475) ~[snakeyaml-1.11.jar:na]
    at org.apache.cassandra.config.YamlConfigurationLoader.loadConfig(YamlConfigurationLoader.java:111) ~[apache-cassandra-2.2.8.jar:2.2.8]
    ... 5 common frames omitted
Caused by: org.yaml.snakeyaml.error.YAMLException: Cannot create property=data_file_directories for JavaBean=org.apache.cassandra.config.Config@24a35978; No single argument constructor found for class [Ljava.lang.String;
    at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:299) ~[snakeyaml-1.11.jar:na]
    at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.construct(Constructor.java:189) ~[snakeyaml-1.11.jar:na]
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:331) ~[snakeyaml-1.11.jar:na]
    ... 11 common frames omitted
Caused by: org.yaml.snakeyaml.error.YAMLException: No single argument constructor found for class [Ljava.lang.String;
    at org.yaml.snakeyaml.constructor.Constructor$ConstructScalar.construct(Constructor.java:379) ~[snakeyaml-1.11.jar:na]
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:182) ~[snakeyaml-1.11.jar:na]
    at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:296) ~[snakeyaml-1.11.jar:na]
    ... 13 common frames omitted

Answer 1

如果在本地计算机上严格用于测试目的，我会使用CCM。

https://github.com/pcmanus/ccm

Answer 2

您的配置似乎正确，我完全按照您的描述进行了操作，效果很好。问题似乎是您在cassandra.yaml文件中存在某种错误。请检查以下行：

data_file_directories:
    - /var/lib/cassandra/data

当它是这样的时候（两行），当它放在一行中时，它将引发帖子中的错误。

在一台计算机上运行多个cassandra实例

2 个答案: