无法启动 Cassandra答案

【问题标题】：Can't start Cassandra无法启动 Cassandra
【发布时间】：2021-02-25 01:07:17
【问题描述】：

我正在尝试运行 cqlsh 以连接到 cassandra 并收到以下错误消息。

a) cqlsh 运行出错：

Connection error: ('Unable to connect to any servers', {'127.0.0.1:9042': error(61, "Tried connecting to [('127.0.0.1', 9042)]. Last error: Connection refused")})

b) 运行 cassandra 后的错误消息：

Exception (java.lang.ExceptionInInitializerError) encountered during startup: null
java.lang.ExceptionInInitializerError
    at org.apache.cassandra.db.SystemKeyspace.checkHealth(SystemKeyspace.java:709)
    at org.apache.cassandra.service.StartupChecks$9.execute(StartupChecks.java:351)
    at org.apache.cassandra.service.StartupChecks.verify(StartupChecks.java:109)
    at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:188)
    at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:607)
    at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:717)
Caused by: java.lang.IllegalArgumentException: Bad configuration; unable to start server: At least one DataFileDirectory must be specified
    at org.apache.cassandra.config.DatabaseDescriptor.createAllDirectories(DatabaseDescriptor.java:846)
    at org.apache.cassandra.db.Keyspace.<clinit>(Keyspace.java:66)
    ... 6 more
ERROR 00:27:05 Exception encountered during startup
java.lang.ExceptionInInitializerError: null
    at org.apache.cassandra.db.SystemKeyspace.checkHealth(SystemKeyspace.java:709) ~[apache-cassandra-2.2.17.jar:2.2.17]
    at org.apache.cassandra.service.StartupChecks$9.execute(StartupChecks.java:351) ~[apache-cassandra-2.2.17.jar:2.2.17]
    at org.apache.cassandra.service.StartupChecks.verify(StartupChecks.java:109) ~[apache-cassandra-2.2.17.jar:2.2.17]
    at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:188) [apache-cassandra-2.2.17.jar:2.2.17]
    at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:607) [apache-cassandra-2.2.17.jar:2.2.17]
    at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:717) [apache-cassandra-2.2.17.jar:2.2.17]
Caused by: java.lang.IllegalArgumentException: Bad configuration; unable to start server: At least one DataFileDirectory must be specified
    at org.apache.cassandra.config.DatabaseDescriptor.createAllDirectories(DatabaseDescriptor.java:846) ~[apache-cassandra-2.2.17.jar:2.2.17]
    at org.apache.cassandra.db.Keyspace.<clinit>(Keyspace.java:66) ~[apache-cassandra-2.2.17.jar:2.2.17]
    ... 6 common frames omitted

c) brew status 显示运行 cassandra 实例出错：

Name          Status  User   Plist
cassandra@2.2 error    /Users/john/Library/LaunchAgents/homebrew.mxcl.cassandra@2.2.plist
rabbitmq      stopped        
redis         started  /Users/john/Library/LaunchAgents/homebrew.mxcl.redis.plist
tomcat@7      stopped

有人可以帮忙解决这个问题吗？

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标签： java cassandra cqlsh

【解决方案1】：

这个错误是从here 抛出的——这意味着你没有配置选项data_file_directories 那个specifies Cassandra 需要存储数据，看起来$CASSANDRA_HOME 没有设置。

打开cassandra.yaml文件，取消注释data_file_directories配置选项和下一行，指向Cassandra可以写入数据的目录而不是默认的/var/lib/cassandra/data。您很可能还需要指定其他参数，例如commitlog_directory、hints_directory 和saved_caches_directory。

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