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https://issues.apache.org/jira/browse/KYLIN-3430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16534657#comment-16534657
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kangkaisen commented on KYLIN-3430:
-----------------------------------
Hi, [~temple.zhou].
There is also a config "kylin.dictionary.append-version-ttl", the default value
is three days. which means we will not delete the dir Within three days.
The Global Dictionary is not cube level, multiple cubes could use the same
Global Dictionary. So we shouldn't delete Global Dictionary when we drop one
cube.
But you remind me, if the Global Dictionary related cube are all dropped,
currently, we will never delete the Global Dictionary in HDFS. This is a issue
indeed, thanks you very much! I thought wrong.
As for how to check a Global Dictionary whether has reference or not, I think
we could get the active Global Dictionary from the cube metadata, if all cube
don't use a Global Dictionary, we could think the Global Dictionary is useless
and delete it.
Thanks you !
> Global Dictionary Cleanup
> -------------------------
>
> Key: KYLIN-3430
> URL: https://issues.apache.org/jira/browse/KYLIN-3430
> Project: Kylin
> Issue Type: Improvement
> Components: Tools, Build and Test
> Affects Versions: v2.1.0, v2.2.0, v2.3.0, v2.3.1, v2.4.0
> Reporter: Temple Zhou
> Assignee: Temple Zhou
> Priority: Major
> Attachments: KYLIN-3430.master.001.patch
>
>
> I had run "{{./bin/metastore.sh clean --delete true" to cleanup my Kylin
> metadata, but, after that, the Global Dictionary still exists in my HDFS and
> the size of directory "/kylin_metadata/resources/GlobalDict/dict" hasn't
> shrunk.}}
>
> {{BTW: I'm very sure that there are redundant Global Dictionaries.}}
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