Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/15993
before this PR, we may see error log like this:
```
16/11/23 21:45:54 ERROR RetryingHMSHandler:
AlreadyExistsException(message:Database default already exists)
at
org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.create_database(HiveMetaStore.java:891)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at
org.apache.hadoop.hive.metastore.RetryingHMSHandler.invoke(RetryingHMSHandler.java:107)
at com.sun.proxy.$Proxy13.create_database(Unknown Source)
at
org.apache.hadoop.hive.metastore.HiveMetaStoreClient.createDatabase(HiveMetaStoreClient.java:644)
```
after this PR, it's gone.
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