执行gremlin报错：java.net.SocketException: Too many open files
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bug
cassandra
- Dominant language
- Java
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Description
### 问题表现
5节点cassandra集群作为HugeGraph后端，执行gremlin查询时，出现错误：`java.net.SocketException: Too many open files`
### 链接情况
查询HugeGraphServer的链接情况，发现，server与cassandra集群的每个节点（node1-node5）都建立400个链接。目前怀疑有链接泄露的情况，待进一步分析
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