zhangbutao opened a new pull request, #5257:
URL: https://github.com/apache/hive/pull/5257
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### What changes were proposed in this pull request?
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At present, `Warehouse ` use fixed `conf ` and we can not change it in the
session connection. But acutully we have supported set session-level conf in
HMSHandler, see `HMSHandler::setMetaConf`.
This PR tries to support set seesion-level conf in `Warehouse `, and then we
can unblock the usefull case like per-session S3 credentials.
1. HMS use `Warehouse `to delete/create hdfs dir, so we should pass s3
credentials to `Warehouse `conf. Adding threadlocal conf in `Warehouse `so that
we can pass session-level conf to `Warehouse `synchronously. e.g. `set
metaconf:fs.s3a.secret.key=my_secret_key;`
2. Make S3 related credentials param valid in` MetastoreConf.ConfVars`
### Why are the changes needed?
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Currently, users can only set S3 credentials on the HMS server side and
users cannot set different S3 credentials for multiple S3 buckets. With this
change, users can set per-session S3 credentials in client side.
e.g, we can set S3 credentials like this from beeline client:
```
set fs.s3a.secret.key=my_secret_key;
set fs.s3a.access.key=my_access.key;
set fs.s3a.endpoint=my_endpoint;
set metaconf:fs.s3a.secret.key=my_secret_key;
set metaconf:fs.s3a.access.key=my_access_key;
set metaconf:fs.s3a.endpoint=my_endpoint;
```
And you can try to create/insert a s3a table:
`create table testtbls3(id int) location 's3a://bucket/testdb/testtbls3';`
### Does this PR introduce _any_ user-facing change?
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No
### Is the change a dependency upgrade?
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No
### How was this patch tested?
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Local test.
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