分析节点似乎已关闭。

Datacenter: Analytics
=====================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address       Load       Tokens  Owns    
DN  172.20.10.20  4.44 MB    1       ?       
Datacenter: Cassandra
=====================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address       Load       Tokens  Owns    
UN  172.20.10.18  281.94 GB  1       ?       
UN  172.20.10.19  281.21 GB  1       ?       
UN  172.20.10.17  281.23 GB  1       ?       
Datacenter: Solr
================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address       Load       Tokens  Owns    
UN  172.20.10.22  277.97 GB  1       ?      
UN  172.20.10.21  286.75 GB  1       ?

所以我登录到那个节点并试图启动spark

dse cassandra -k

但我得到以下例外

Exception encountered during startup: null
INFO  07:15:58  DSE shutting down...
INFO  07:15:58  All plugins are stopped.