我在digitalocean上有一个4GB的RAM ubuntu服务器 我正在使用cassandra 3.9
完成设置过程后，详细here
cqlsh，nodetool status都返回此消息：
nodetool：无法连接到＆＃39; 127.0.0.1：7199＆＃39; - ConnectException：＆＃39;连接被拒绝（连接被拒绝）＆＃39;。
我已经阅读了几个类似的问题，他们都提出了4GB的最小ram大小，我有，但仍然得到相同的错误＆gt;＆gt; Nodetool status connection refused
有人建议将listen_address和rpc_address设置为cassandra.yaml中指定ip的digitalocean，也尝试过，但问题仍然存在
有人建议查看调试日志＆amp;系统日志，很多[INFO]和[DEBUG]行，但我有一些[WARN]行，它们不会终止执行，它终止于[ERROR]行
警告
... WARN [main] 2018-03-13 12:06:52,359 DatabaseDescriptor.java:563 - Small commitlog volume detected at /var/lib/cassandra/commitlog; setting commitlog_total_space_in_mb to 6158. You can override this in cassandra.yaml WARN [main] 2018-03-13 12:06:52,361 DatabaseDescriptor.java:590 - Small cdc volume detected at /var/lib/cassandra/cdc_raw; setting cdc_total_space_in_mb to 3079. You can override this in cassandra.yaml WARN [main] 2018-03-13 12:06:52,365 DatabaseDescriptor.java:643 - Only 22.102GiB free across all data volumes. Consider adding more capacity to your cluster or removing obsolete snapshots ... WARN [main] 2018-03-13 12:06:52,530 StartupChecks.java:123 - jemalloc shared library could not be preloaded to speed up memory allocations WARN [main] 2018-03-13 12:06:52,530 StartupChecks.java:156 - JMX is not enabled to receive remote connections. Please see cassandra-env.sh for more info. INFO [main] 2018-03-13 12:06:52,533 SigarLibrary.java:44 - Initializing SIGAR library WARN [main] 2018-03-13 12:06:52,554 SigarLibrary.java:174 - Cassandra server running in degraded mode. Is swap disabled? : true, Address space adequate? : true, nofile limit adequate? : true, nproc limit adequate? : false
错误
...
ERROR [main] 2018-03-13 12:06:55,808 CassandraDaemon.java:747 - Exception encountered during startup
java.lang.AbstractMethodError: org.apache.cassandra.utils.JMXServerUtils$Exporter.exportObject(Ljava/rmi/Remote;ILjava/rmi/server/RMIClientSocketFactory;Ljava/rmi/ser$
at javax.management.remote.rmi.RMIJRMPServerImpl.export(RMIJRMPServerImpl.java:150) ~[na:1.8.0_161]
at javax.management.remote.rmi.RMIJRMPServerImpl.export(RMIJRMPServerImpl.java:135) ~[na:1.8.0_161]
at javax.management.remote.rmi.RMIConnectorServer.start(RMIConnectorServer.java:405) ~[na:1.8.0_161]
at org.apache.cassandra.utils.JMXServerUtils.createJMXServer(JMXServerUtils.java:106) ~[apache-cassandra-3.9.jar:3.9]
at org.apache.cassandra.service.CassandraDaemon.maybeInitJmx(CassandraDaemon.java:145) [apache-cassandra-3.9.jar:3.9]
at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:219) [apache-cassandra-3.9.jar:3.9]
at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:601) [apache-cassandra-3.9.jar:3.9]
at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:730) [apache-cassandra-3.9.jar:3.9]
不确定如何处理该错误消息
我怀疑你们很多人都遇到过这个问题，有些人解决了这个问题 请详细说明我们其他人（以及未来的人）如何对其进行分类
我正在考虑尝试更早版本的cassandra，也许这个问题特定于版本3.9而不是早期版本