zhoney

执行gremlin报错：java.net.SocketException: Too many open files

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### 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

[Feature] support basic functions for TikvStdSessions

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### Feature Description (功能描述) Implement basic functions of table in class `TikvStdSessions`, includes: - `createTable()` - `dropTable()` - `existsTable()`

### Feature Description (功能描述) For insert performance, possible improvements are: - batch size - commit mode(atomic or not) - ... For query performance, possible improvements are: - key/value encode style...

### Feature Description (功能描述) HugeGraph has hundreds of tests for basic functions and some corner cases. Adapt tikv backend driver to run these tests successfully, which will ensure tikv backend...

### Feature Description (功能描述) Implement basic functions of graph in `class TiKVStore`, includes: - `init()` - `clear()` - `truncate()` - `initialized()`

### Feature Description (功能描述) HugeGraph use `http://ip:port/metrics/backend` API interface to query status of backend storage。Therefore, metrics for Tikv should be implemented. The class and core function to be implemented is...