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ASF GitHub Bot commented on DRILL-4726: --------------------------------------- Github user arina-ielchiieva commented on a diff in the pull request: https://github.com/apache/drill/pull/574#discussion_r77974471 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/coord/zk/ZookeeperClient.java --- @@ -179,6 +220,22 @@ public void create(final String path) { * @param data data to store */ public void put(final String path, final byte[] data) { + put(path, data, null); + } + + /** + * Puts the given byte sequence into the given path. + * + * If path does not exists, this call creates it. + * + * If version holder is not null, passes given version for comparison. + * Throws {@link VersionMismatchException} if versions mismatch was detected. --- End diff -- Sure, I'll add a little bit more of explanation. Regarding UDF registration / unregistration we have CreateFunctionHandler.register has try / catch clause with method recursive call, the same in DropFunctionHandler.unregister to ensure we write back version we have. If version has changed we re-validate UDFs against updated registry and try to update remote registry one more time till retry times quantity haven't been exceeded. > 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 > -- This message was sent by Atlassian JIRA (v6.3.4#6332)