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https://issues.apache.org/jira/browse/HIVE-10722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14567904#comment-14567904
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Sergey Shelukhin commented on HIVE-10722:
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Added to LanguageManual – DDL – Recover Partitions (MSCK REPAIR TABLE)
> external table creation with msck in Hive can create unusable partition
> -----------------------------------------------------------------------
>
> Key: HIVE-10722
> URL: https://issues.apache.org/jira/browse/HIVE-10722
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.14.1, 1.0.0
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Priority: Critical
> Labels: TODOC1.3
> Fix For: 1.3.0
>
> Attachments: HIVE-10722.01.patch, HIVE-10722.patch
>
>
> There can be directories in HDFS containing unprintable characters; when
> doing hadoop fs -ls, these characters are not even visible, and can only be
> seen for example if output is piped thru od.
> When these are loaded via msck, they are stored in e.g. mysql as "?" (literal
> question mark, findable via LIKE '%?%' in db) and show accordingly in Hive.
> However, datanucleus appears to encode it as %3F; this causes the partition
> to be unusable - it cannot be dropped, and other operations like drop table
> get stuck (didn't investigate in detail why; drop table got unstuck as soon
> as the partition was removed from metastore).
> We should probably have a 2-way option for such cases - error out on load
> (default), or convert to '?'/drop such characters (and have partition that
> actually works, too).
> We should also check if partitions with '?' inserted explicitly work at all
> with datanucleus.
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