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https://issues.apache.org/jira/browse/HIVE-16993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16069221#comment-16069221
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Dan Burkert commented on HIVE-16993:
------------------------------------
Added patch revision 1 with refreshed generated thrift sources, and a few
updates to the tests to make it compatible with the newly generated ctor
signature for {{Database}}.
> ThriftHiveMetastore.create_database can fail if the locationUri is not set
> --------------------------------------------------------------------------
>
> Key: HIVE-16993
> URL: https://issues.apache.org/jira/browse/HIVE-16993
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Reporter: Dan Burkert
> Assignee: Dan Burkert
> Attachments: HIVE-16993.0-master.patch, HIVE-16993.1-master.patch
>
>
> Calling
> [{{ThriftHiveMetastore.create_database}}|https://github.com/apache/hive/blob/3fa48346d509813977cd3c7622d581c0ccd51e99/metastore/if/hive_metastore.thrift#L1078]
> with a database with an unset {{locationUri}} field through the C++
> implementation fails with:
> {code}
> MetaException(message=java.lang.IllegalArgumentException: Can not create a
> Path from an empty string)
> {code}
> The
> [{{locationUri}}|https://github.com/apache/hive/blob/3fa48346d509813977cd3c7622d581c0ccd51e99/metastore/if/hive_metastore.thrift#L270]
> Thrift field is 'default requiredness (implicit)', and Thrift [does not
> specify|https://thrift.apache.org/docs/idl#default-requiredness-implicit]
> whether unset default requiredness fields are encoded. Empirically, the Java
> generated code [does not write the
> {{locationUri}}|https://github.com/apache/hive/blob/3fa48346d509813977cd3c7622d581c0ccd51e99/metastore/src/gen/thrift/gen-javabean/org/apache/hadoop/hive/metastore/api/Database.java#L938-L942]
> when the field is unset, while the C++ generated code
> [does|https://github.com/apache/hive/blob/3fa48346d509813977cd3c7622d581c0ccd51e99/metastore/src/gen/thrift/gen-cpp/hive_metastore_types.cpp#L3888-L3890].
> The MetaStore treats the field as optional, and [fills in a default
> value|https://github.com/apache/hive/blob/3fa48346d509813977cd3c7622d581c0ccd51e99/metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java#L867-L871]
> if the field is unset.
> The end result is that when the C++ implementation sends a {{Database}}
> without the field set, it actually writes an empty string, and the MetaStore
> treats it as a set field (non-null), and then calls a {{Path}} API which
> rejects the empty string. The fix is simple: make the {{locationUri}} field
> optional in metastore.thrift.
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