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From "John Sichi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1634) Allow access to Primitive types stored in binary format in HBase
Date Thu, 04 Nov 2010 21:08:42 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928356#action_12928356
] 

John Sichi commented on HIVE-1634:
----------------------------------

But looking into it further, is it true that the only difference in persistence format is
for Long and Integer (due to the zero-compression)?  Or are any of the other formats different
as well?  If it's only these, then adding a whole new set of classes seems like a bad idea,
and we should instead do any necessary refactoring now to allow the existing binary classes
to be used (and add a couple of new ones for uncompressed int/long).

Considering the fact that we eventually want to be able to store map/struct/list as well (the
rest of HIVE-1245), it's worth looking into the refactoring now, since the existing lazybinary
covers those too (and we don't want to duplicate that).


> Allow access to Primitive types stored in binary format in HBase
> ----------------------------------------------------------------
>
>                 Key: HIVE-1634
>                 URL: https://issues.apache.org/jira/browse/HIVE-1634
>             Project: Hive
>          Issue Type: Improvement
>          Components: HBase Handler
>    Affects Versions: 0.7.0
>            Reporter: Basab Maulik
>            Assignee: Basab Maulik
>         Attachments: HIVE-1634.0.patch, TestHiveHBaseExternalTable.java
>
>
> This addresses HIVE-1245 in part, for atomic or primitive types.
> The serde property "hbase.columns.storage.types" = "-,b,b,b,b,b,b,b,b" is a specification
of the storage option for the corresponding column in the serde property "hbase.columns.mapping".
Allowed values are '-' for table default, 's' for standard string storage, and 'b' for binary
storage as would be obtained from o.a.h.hbase.utils.Bytes. Map types for HBase column families
use a colon separated pair such as 's:b' for the key and value part specifiers respectively.
See the test cases and queries for HBase handler for additional examples.
> There is also a table property "hbase.table.default.storage.type" = "string" to specify
a table level default storage type. The other valid specification is "binary". The table level
default is overridden by a column level specification.
> This control is available for the boolean, tinyint, smallint, int, bigint, float, and
double primitive types. The attached patch also relaxes the mapping of map types to HBase
column families to allow any primitive type to be the map key.
> Attached is a program for creating a table and populating it in HBase. The external table
in Hive can access the data as shown in the example below.
> hive> create external table TestHiveHBaseExternalTable
>     > (key string, c_bool boolean, c_byte tinyint, c_short smallint,
>     >  c_int int, c_long bigint, c_string string, c_float float, c_double double)
>     >  stored by 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
>     >  with serdeproperties ("hbase.columns.mapping" = ":key,cf:boolean,cf:byte,cf:short,cf:int,cf:long,cf:string,cf:float,cf:double")
>     >  tblproperties ("hbase.table.name" = "TestHiveHBaseExternalTable");
> OK
> Time taken: 0.691 seconds
> hive> select * from TestHiveHBaseExternalTable;
> OK
> key-1	NULL	NULL	NULL	NULL	NULL	Test-String	NULL	NULL
> Time taken: 0.346 seconds
> hive> drop table TestHiveHBaseExternalTable;
> OK
> Time taken: 0.139 seconds
> hive> create external table TestHiveHBaseExternalTable
>     > (key string, c_bool boolean, c_byte tinyint, c_short smallint,
>     >  c_int int, c_long bigint, c_string string, c_float float, c_double double)
>     >  stored by 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
>     >  with serdeproperties (
>     >  "hbase.columns.mapping" = ":key,cf:boolean,cf:byte,cf:short,cf:int,cf:long,cf:string,cf:float,cf:double",
>     >  "hbase.columns.storage.types" = "-,b,b,b,b,b,b,b,b" )
>     >  tblproperties (
>     >  "hbase.table.name" = "TestHiveHBaseExternalTable",
>     >  "hbase.table.default.storage.type" = "string");
> OK
> Time taken: 0.139 seconds
> hive> select * from TestHiveHBaseExternalTable;
> OK
> key-1	true	-128	-32768	-2147483648	-9223372036854775808	Test-String	-2.1793132E-11	2.01345E291
> Time taken: 0.151 seconds
> hive> drop table TestHiveHBaseExternalTable;
> OK
> Time taken: 0.154 seconds
> hive> create external table TestHiveHBaseExternalTable
>     > (key string, c_bool boolean, c_byte tinyint, c_short smallint,
>     >  c_int int, c_long bigint, c_string string, c_float float, c_double double)
>     >  stored by 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
>     >  with serdeproperties (
>     >  "hbase.columns.mapping" = ":key,cf:boolean,cf:byte,cf:short,cf:int,cf:long,cf:string,cf:float,cf:double",
>     >  "hbase.columns.storage.types" = "-,b,b,b,b,b,-,b,b" )
>     >  tblproperties ("hbase.table.name" = "TestHiveHBaseExternalTable");
> OK
> Time taken: 0.347 seconds
> hive> select * from TestHiveHBaseExternalTable;
> OK
> key-1	true	-128	-32768	-2147483648	-9223372036854775808	Test-String	-2.1793132E-11	2.01345E291
> Time taken: 0.245 seconds
> hive> 

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