[ http://issues.apache.org/jira/browse/HADOOP-689?page=comments#action_12454060 ] Hadoop QA commented on HADOOP-689: ----------------------------------
+1, http://issues.apache.org/jira/secure/attachment/12345896/HADOOP-689.patch.new applied and successfully tested against trunk revision 480142 > hadoop should provide a common way to wrap instances with different types > into one type > --------------------------------------------------------------------------------------- > > Key: HADOOP-689 > URL: http://issues.apache.org/jira/browse/HADOOP-689 > Project: Hadoop > Issue Type: Improvement > Components: io > Environment: All environment > Reporter: Feng Jiang > Attachments: HADOOP-689.patch, HADOOP-689.patch.new > > > When two sequence files, which have same Key type but different Value types, > are mapped out to reduce, multiple Value types is not allowed. In this case, > we need a way to wrap instances with different types into one class type to > reduce. > In current code, ObjectWritable is a sole choice. but it costs too many > space, because the class declaration will be appended into output file as a > string for every Key-value pair. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
