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https://issues.apache.org/jira/browse/DRILL-4726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15468203#comment-15468203
]
ASF GitHub Bot commented on DRILL-4726:
---------------------------------------
Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/574#discussion_r77696109
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/DrillFunctionRegistry.java
---
@@ -218,4 +302,141 @@ private void
registerOperatorsWithoutInference(DrillOperatorTable operatorTable)
}
}
}
+
+ /**
+ * Function registry holder. Stores function implementations by jar
name, function name.
+ */
+ private class GenericRegistryHolder<T, U> {
+ private final ReadWriteLock readWriteLock = new
ReentrantReadWriteLock();
+ private final AutoCloseableLock readLock = new
AutoCloseableLock(readWriteLock.readLock());
+ private final AutoCloseableLock writeLock = new
AutoCloseableLock(readWriteLock.writeLock());
+
--- End diff --
Not convinced the locking strategy works. The read, write and read/write
locks are independent: locking one does not block the others. This means that a
write lock will mutate data structures while a read lock attempts to read them:
probably not what was intended.
> Dynamic UDFs support
> --------------------
>
> Key: DRILL-4726
> URL: https://issues.apache.org/jira/browse/DRILL-4726
> Project: Apache Drill
> Issue Type: New Feature
> Affects Versions: 1.6.0
> Reporter: Arina Ielchiieva
> Assignee: Arina Ielchiieva
> Fix For: Future
>
>
> Allow register UDFs without restart of Drillbits.
> Design is described in document below:
> https://docs.google.com/document/d/1FfyJtWae5TLuyheHCfldYUpCdeIezR2RlNsrOTYyAB4/edit?usp=sharing
>
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