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https://issues.apache.org/jira/browse/HIVE-13596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15258709#comment-15258709
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Jason Dere commented on HIVE-13596:
-----------------------------------
- Should this be a settable option (as opposed to always on)? And why default
to false?
- Which Registry is performing the UDF lookup, the system registry or the
session registry? If it is the system registry, then we may run into HIVE-6672
again. checkFunctionClass() (removed in your patch) was added for this purpose.
If the functions are being looked up/added to the session registry, then this
may not be an issue because every session would need to lookup UDF/load JARs.
Actually I see that the permanent UDFs by Hive.reloadFunctions() (at initialize
time) are added to the system registry .. I suspect Hive probably has class
loading issues if we ever use "RELOAD FUNCTIONS" to pick up new UDFs, since
Hive no longer seems to be calling checkFunctionClass().
- public Registry(boolean isNative, HiveConf conf):
- conf needs a null check before it's used
- private FunctionInfo getQualifiedFunctionInfo():
- Wrap if/then with braces
- private boolean refreshFunctionInfoFromMetastore(String functionName)
- line 629: wrap if/then with braces
> HS2 should be able to get UDFs on demand from metastore
> -------------------------------------------------------
>
> Key: HIVE-13596
> URL: https://issues.apache.org/jira/browse/HIVE-13596
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-13596.patch
>
>
> When multiple HS2s are run, creating a permanent fn is only executed on one
> of them, and the other HS2s don't get the new function. Unlike say with
> tables, where we always get stuff from db on demand, fns are registered at
> certain points in the code and if the new one is not registered, it will not
> be available.
> We should restore the pre-HIVE-2573 behavior of being able to refresh the
> UDFs on demand.
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