NebulaGraph 讨论群 · Venus-2022-W52 #164
Replies: 118 comments
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请问，我把一个集群中的data目录和wal目录都拷贝到另外一个新集群中，能否直接使用？ |
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我现在有个场景，我们在云端集群搭建了nebula，数据都录入进去了。现在如果把这套数据导入到另外一个内网隔离环境的新集群中，有什么好的办法吗？v3.2.0版本 |
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内网隔离环境没有hadoop |
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有没有老师帮忙回答下这个问题？ |
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我想请教一下nGQL里面有没有类似JOIN的操作，比如我想将GO FROM XX OVER #{some edge} YIELD properties()的结果与另一个GO FROM XX OVER #{other edge} YIELD properties()这两条语句的结果组合形成一个统一的属性集合，请问该怎么做？我看文档上只有UNION的操作，其它没有 |
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nebula数据实时写入后，可以实时查询到吗？ |
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「Q24：请问，我把一个集群中的data目录和wal目录都拷贝到另外一个新集群中，能否直接使用？」 |
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「DDV123：我想请教一下nGQL里面有没有类似JOIN的操作，比如我想将GO FROM XX OVER #{some edge} YIELD properties()的结果与另一个GO FROM XX OVER #{other edge} YIELD properties()这两条语句的结果组合形成一个统一的属性集合，请问该怎么做？我看文档上只有UNION的操作，其它没有 」 看下文档：https://docs.nebula-graph.com.cn/3.3.0/3.ngql-guide/5.operators/4.pipe/ |
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「想念小鱼干的清蒸：看下文档：https://docs.nebula-graph.com.cn/3.3.0/3.ngql-guide/5.operators/4.pipe/」 管道符是传递两个语句之间的变量吧，能做到类似JOiN的操作吗？ |
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我对 SQL 不熟，如果等会没有其他人回复你的话，你可以去论坛问问 |
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请问下大佬们，我vid准备设计成 tag_type + entity_unqiue_name ，这样 vid的FIXED_STRING(N) N |
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请问下大佬们，我vid准备设计成 tag_type + entity_unqiue_name ，这样 vid的FIXED_STRING(N)， N设置多大合理呀，能给点建议吗？谢谢啦 |
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「Peter 周敏浩：请问下大佬们，我vid准备设计成 tag_type + entity_unqiue_name ，这样 vid的FIXED_STRING(N)， N设置多大合理呀，能给点建议吗？谢谢啦」 越小越好。 |
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好滴 |
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@方扬 大佬 弱弱的问下 N=64 会不会大啦？ vid里有中文 |
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试试antv？ |
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@枝栖 explorer 支持 iframe，可以看一下：https://docs.nebula-graph.com.cn/3.3.0/nebula-explorer/iframe/ |
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好嘞 谢谢大家 |
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我问下nebula的java客户端返回字段“latencyInUs”是什么意思呀？ |
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就是字面意思吧，延迟，单位是微秒 |
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哦哦，感谢 |
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一起来康康 [让我看看] |
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「菠菜：vesoft-inc/nebula#5120 提了」 这个是我们最近新提交代码引入的一个 bug，刚刚已经 fix，很快合入。所以说不建议用 nightly 版本，用正式 release 的版本会好很多。后面我们会发布 3.4 版本，稳定性的问题，OOM的问题都会好很多，bug 也会少很多。 |
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点赞 |
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使用match和go进行匹配路径，match相较go会有性能问题吗？ |
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看版本，目前已经release的版本中，go版本性能会好些，不过在后面的3.4版本中，match的性能可能会更好；match的性能是我们优化的重点。 |
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好的，谢谢大佬 |
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我最近刚好也大量用到match，我想问一下go是不是你们自己开发的抽象语法树之类的，match还是基于opencypher的？ |
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go 按定义严格来讲是不能匹配路径的 |
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「DDV123：我最近刚好也大量用到match，我想问一下go是不是你们自己开发的抽象语法树之类的，match还是基于opencypher的？」 go 是我们独有的，match 在目前版本能够兼容 openCyyher，后续版本都是按照新的国际标准 GQL 来，跟 openCypher没关系。 |
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Archive of WeChat Group: NebulaGraph 讨论群 · Venus-2022-W52
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