[ http://issues.apache.org/jira/browse/HADOOP-76?page=all ]
Sanjay Dahiya updated HADOOP-76: -------------------------------- Attachment: Hadoop-76_1.patch Here is update patch for review changes in this patch - Moved temp files to (mapred.system.dir)/<jobid> - 2 new variables in TIP - - runningTasks ( to track currently running instances of attempts for same task, earlier this was done using a boolean) - hasCompletedTask ( for reduces if a attempts succeeds then all subsequent failures for same TIP should be ignored, existing setup tries to schedule another task for that.) - Added a phaseFileSystem, which takes a jobid, tipid, taskid and creates all files in (mapred.system.dir)/<jobid>/<tipid>/<taskid>, these are moved to their final location on commit or deleted. - Task Constructor needs tip id now, its passed in RPC as well. - Task.localizeConfiguration adds tip id to conf. - Minor change in FSDirectory to add exception message in log if rename fails. +Planning to add an example for using PhasedFileSystem - changing RandomWriter to use PhasedFileSystem, as Devaraj suggested in a separate patch on the same issue. thanks owen for review. > Implement speculative re-execution of reduces > --------------------------------------------- > > Key: HADOOP-76 > URL: http://issues.apache.org/jira/browse/HADOOP-76 > Project: Hadoop > Issue Type: Improvement > Components: mapred > Affects Versions: 0.1.0 > Reporter: Doug Cutting > Assigned To: Sanjay Dahiya > Priority: Minor > Attachments: Hadoop-76.patch, Hadoop-76_1.patch, spec_reducev.patch > > > As a first step, reduce task outputs should go to temporary files which are > renamed when the task completes. -- 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