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From "Ferdy Galema (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GORA-34) Lazy loading for maps
Date Thu, 19 Apr 2012 12:00:42 GMT

    [ https://issues.apache.org/jira/browse/GORA-34?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13257442#comment-13257442
] 

Ferdy Galema commented on GORA-34:
----------------------------------

This is pretty difficult to implement seeing the whole is now implemented in a bean/pojo-like
manner. I'm not sure if it is the right way to go to implement lazy loading in a manner that
a every key is requested from HBase. (Is this what you are suggesting?).

If you know what keys to retrieve in advance you can always specify those more specifically
on the input. I.e. instead of "data" you specify "data:key1, data:key2" etc.
                
> Lazy loading for maps
> ---------------------
>
>                 Key: GORA-34
>                 URL: https://issues.apache.org/jira/browse/GORA-34
>             Project: Apache Gora
>          Issue Type: Improvement
>          Components: storage-hbase
>            Reporter: Yves Langisch
>             Fix For: 0.3
>
>
> I mainly use a big map for each row in my hbase project. So my avro schema looks as follows:
> {
>     "type": "record",
>     "name": "Request",
>     "namespace": "ch.test.generated",
>     "fields" : [
>         {
>             "name": "data",
>             "type": {
>                 "type": "map",
>                 "values": "long"
>             }
>         }
>     ]
> }
> As far as I could see the whole map is read from hbase whenever I get a row. Since I'm
adding many map entries over time I would like to see some kind of lazy loading when accessing
the map. A good place to specify this behavior would be the mapping file:
> <gora-orm>
>     <class name="ch.test.generated.Request" keyClass="java.lang.Long" table="RequestLog">
>         <field name="data" family="dimension" lazy="true"/>
>     </class>
> </gora-orm>

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