Janusgraph org.apache.tinkerpop.gremlin.driver.exception.ResponseException: Error during serialization: Could not execute operation due to backend exception

项目里使用的图数据Cassandra+Elasticsearch+JanusGraph，代码没动过，忽然有的查询报错org.apache.tinkerpop.gremlin.driver.exception.ResponseException: Error during serialization: Could not execute operation due to backend exception

分析:数据库本身出问题了，让数据组的小伙伴帮忙检查节点是不是有挂掉的，最后发现有一个Cassandra节点没起，启动该节点，问题解决