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add: add exchange faq tips (#1327)
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* add: add exchange faq tips

* Update docs-2.0/nebula-exchange/ex-ug-FAQ.md

Co-authored-by: randomJoe211 <[email protected]>

* Update docs-2.0/nebula-exchange/ex-ug-FAQ.md

Co-authored-by: randomJoe211 <[email protected]>

* Update docs-2.0/nebula-exchange/ex-ug-FAQ.md

Co-authored-by: randomJoe211 <[email protected]>

* mod: modify format

* mod: modify exchange faq format

* Update ex-ug-FAQ.md

Co-authored-by: randomJoe211 <[email protected]>
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QingZ11 and randomJoe211 authored Dec 16, 2021
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Expand Up @@ -116,6 +116,31 @@ nebula-exchange-2.0.0.jar \
-c application.conf
```

### Q:Hive 数据导入时提示 schema 版本不一致

Spark 日志提示 `Hive Schema version 1.2.0 does not match metastore's schema version 2.1.0 Metastore is not upgraded or corrupt` 的原因是 Hive 环境中配置的 metastore schema 版本和 Spark 使用的 metastore 版本不一致。
解决方法:
1. 将 Hive 环境中存储 Hive metastore 信息的 MySQL version 信息更新为 Spark 中使用的 metastore 版本。
假设 Hive 在 MySQL 中存储 metastore 的数据库是`hive`,需要按如下方式修改 `hive.VERSION` 表中的 `version` 字段:
```
update hive.VERSION set SCHEMA_VERSION="2.1.0" where VER_ID=1
```
2. 在 Hive 环境的 `hive-site.xml` 文件中增加如下配置:
```
<property>
<name>hive.metastore.schema.verification</name>
<value>false</value>
</property>
```
3. 重启 Hive。
## 配置问题
### Q:哪些配置项影响导入性能?
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