speculative execution start up condition based on completion time
-----------------------------------------------------------------
Key: HADOOP-2141
URL: https://issues.apache.org/jira/browse/HADOOP-2141
Project: Hadoop
Issue Type: Improvement
Components: mapred
Affects Versions: 0.14.3
Reporter: Koji Noguchi
Fix For: 0.16.0
We had one job with speculative execution hang.
4 reduce tasks were stuck with 95% completion because of a bad disk.
Devaraj pointed out
bq . One of the conditions that must be met for launching a speculative
instance of a task is that it must be at least 20% behind the average progress,
and this is not true here.
It would be nice if speculative execution also starts up when tasks stop making
progress.
Devaraj suggested
bq. Maybe, we should introduce a condition for average completion time for
tasks in the speculative execution check.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
