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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Hive/HBaseIntegration" by JohnSichi
Date Thu, 04 Mar 2010 23:26:08 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "Hive/HBaseIntegration" page has been changed by JohnSichi.
http://wiki.apache.org/hadoop/Hive/HBaseIntegration?action=diff&rev1=13&rev2=14

--------------------------------------------------

  
  == Illegal:  Hive Primitive to HBase Column Family ==
  
- Table definitions such as the following should be avoided because a
+ Table definitions such as the following are illegal because a
- Hive column mapped to a column family must have MAP type:
+ Hive column mapped to an entire column family must have MAP type:
  
  {{{
  CREATE TABLE hbase_table_1(key int, value string) 
@@ -251, +251 @@

  WITH SERDEPROPERTIES (
  "hbase.columns.mapping" = "cf:"
  );
+ FAILED: Error in metadata: java.lang.RuntimeException: MetaException(message:org.apache.hadoop.hive.serde2.SerDeException
org.apache.hadoop.hive.hbase.HBaseSerDe: hbase column family 'cf:' should be mapped to map<string,?>
but is mapped to string)
  }}}
  
- Currently, the CREATE TABLE will succeed, but attempts to insert data
- will fail with this internal error:
- 
- {{{
- java.lang.RuntimeException: org.apache.hadoop.hive.serde2.lazy.objectinspector.primitive.LazyStringObjectInspector
cannot be cast to org.apache.hadoop.hive.serde2.objectinspector.MapObjectInspector
- }}}
- 
- An improvement would be to catch this at CREATE TABLE time and reject
- it as invalid.
  
  = Key Uniqueness =
  

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