Eugene Koifman created HIVE-4580:
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Summary: Change DDLTask to report errors using canonical error
messages rather than http status codes
Key: HIVE-4580
URL: https://issues.apache.org/jira/browse/HIVE-4580
Project: Hive
Issue Type: Bug
Components: HCatalog
Affects Versions: 0.11.0
Reporter: Eugene Koifman
org.apache.hadoop.hive.ql.exec.DDLTask handles DDL operations in Hive.
Some operations (those exposed as REST API by Templeton) in this class, write a
JSON object to stdout (on failure) which includes "error" and "errorCode"
fields. "errorCode" is set to values like 404, 500, etc. i.e. Http Status
codes. I believe this was done to support Templeton REST API. This is not the
right place to introduce Http codes.
DDLTask should use canonical error messages defined in
org.apache.hadoop.hive.ql.ErrorMsg and propagate it up to HCatCli which can
decide how to encode the error and to which stream. In particular it can
create a parseable JSON object which Templeton can then interpret. JSON object
can also be generated here for errors from the parser/resolver (e.g. trying to
describe a table which doesn't exist).
Then Templeton can map the canonical error code to appropriate Http Code.
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