[ https://issues.apache.org/jira/browse/HIVE-1343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Carl Steinbach updated HIVE-1343: --------------------------------- Component/s: Serializers/Deserializers > add an interface in RCFile to support concatenation of two files without > (de)compression > ---------------------------------------------------------------------------------------- > > Key: HIVE-1343 > URL: https://issues.apache.org/jira/browse/HIVE-1343 > Project: Hive > Issue Type: New Feature > Components: Serializers/Deserializers > Affects Versions: 0.6.0 > Reporter: Ning Zhang > Assignee: He Yongqiang > Attachments: HIVE-1343.1.patch > > > If two files are concatenated, we need to read each record in these files and > write them back to the destination file. The IO cost is mostly unavoidable > due to the lack of append functionality in HDFS. However the CPU cost could > be significantly reduced by avoiding compression and decompression of the > files. > The File Format layer should provide API that implement the block-level > concatenation. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira