[ http://issues.apache.org/jira/browse/HADOOP-433?page=comments#action_12426763 ] Owen O'Malley commented on HADOOP-433: --------------------------------------
This is largely addressed by the extensions I put into the JobConf task localization code. Look at MapTask.localizeConfiguration. In particular, each Mapper has available to it: map.input.file map.input.start map.input.length For application writers that don't want to read the Hadoop code, I've put the list of attributes in: http://wiki.apache.org/lucene-hadoop/TaskExecutionEnvironment This will let you get an equivalent RecordReader even if it is not the same object. Will that address your problem? > Better access to the RecordReader > --------------------------------- > > Key: HADOOP-433 > URL: http://issues.apache.org/jira/browse/HADOOP-433 > Project: Hadoop > Issue Type: Improvement > Components: mapred > Affects Versions: 0.5.0 > Reporter: Benjamin Reed > Priority: Minor > > The record reader has access to the FileSplit which can in turn have > information that is useful to the Mapper. For example, Map processing may > vary according to file name or attributes associated with a file. > Unfortunately, even using a MapRunner you only have access to the progress > wrapper of the RecordReader. To get access to the real record reader I had to > use a thread local variable which I set in RecordReader.getNext(). It would > be much nicer if you could get a reference to the real RecordReader from the > RecordReader passed to MapRunner. -- 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
