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Update FAQs #1379

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Jan 12, 2022
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Update FAQs #1379

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25 changes: 25 additions & 0 deletions docs-2.0/20.appendix/0.FAQ.md
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Expand Up @@ -269,6 +269,31 @@ nebula > MATCH (s)<-[e]-() WHERE id(s) == "given" RETURN count(e); #入度

- Tag 或 Edge type 的名称是否为关键字，如果是关键字，请使用反引号（\`）将它们括起来。详情请参见[关键字](../3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md)。

### 编译 Exchange、Connectors、Algorithm 时无法下载 SNAPSHOT 包

现象：编译时提示`Could not find artifact com.vesoft:client:jar:xxx-SNAPSHOT`。

原因：本地 maven 没有配置用于下载 SNAPSHOT 的仓库。maven 中默认的 central 仓库用于存放正式发布版本，而不是开发版本（SNAPSHOT）。

解决方案：在 maven 的 setting.xml文件的`profiles`作用域内中增加以下配置：

```
<profile>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<repositories>
<repository>
<id>snapshots</id>
<url>https://oss.sonatype.org/content/repositories/snapshots/</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
</profile>
```

## 关于运维

### 日志文件过大时如何回收日志？
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32 changes: 32 additions & 0 deletions docs-2.0/nebula-exchange/ex-ug-FAQ.md
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Expand Up @@ -19,6 +19,31 @@

**原因**：Exchange 的`pom.xml`中有两个依赖包不在 Maven 的 central 仓库中，`pom.xml`配置了这两个依赖所在的仓库地址。如果 maven 中配置的镜像地址对应的`mirrorOf`值为`*`，那么所有依赖都会在 central 仓库下载，导致下载失败。

### Q：编译 Exchange 时无法下载 SNAPSHOT 包

现象：编译时提示`Could not find artifact com.vesoft:client:jar:xxx-SNAPSHOT`。

原因：本地 maven 没有配置用于下载 SNAPSHOT 的仓库。maven 中默认的 central 仓库用于存放正式发布版本，而不是开发版本（SNAPSHOT）。

解决方案：在 maven 的 setting.xml文件的`profiles`作用域内中增加以下配置：

```
<profile>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<repositories>
<repository>
<id>snapshots</id>
<url>https://oss.sonatype.org/content/repositories/snapshots/</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
</profile>
```

## 执行问题

### Q：Yarn-Cluster 模式下如何提交？
Expand Down Expand Up @@ -141,6 +166,13 @@ Spark 日志提示 `Hive Schema version 1.2.0 does not match metastore's schema

3. 重启 Hive。

### Q: 生成 SST 时提示 org.rocksdb.RocksDBException: While open a file for appending: /path/sst/1-xxx.sst: No such file or directory

排查方法：

1. 检查`/path`是否存在，如没有或者路径设置错误，创建或修正路径。
2. 检查 Spark 在每台机器上的当前用户对`/path`是否有操作权限，如没有，添加权限。

## 配置问题

### Q：哪些配置项影响导入性能？
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