[jira] [Created] (HIVE-16993) ThriftHiveMetastore.create_database can fail if the locationUri is not set

["Dan Burkert (JIRA)" <ji...@apache.org>]

Dan Burkert created HIVE-16993:
----------------------------------

             Summary: 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


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.



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)