[ https://issues.apache.org/jira/browse/MAPREDUCE-2932?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Harsh J updated MAPREDUCE-2932: ------------------------------- Status: Patch Available (was: Open) > Missing instrumentation plugin class shouldn't crash the TT startup per design > ------------------------------------------------------------------------------ > > Key: MAPREDUCE-2932 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-2932 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: tasktracker > Affects Versions: 0.20.2 > Reporter: Harsh J > Assignee: Harsh J > Priority: Trivial > Attachments: 0.20-MAPREDUCE-2932.r1.diff > > > Per the implementation of the TaskTracker instrumentation plugin > implementation (from 2008), a ClassNotFoundException during loading up of an > configured TaskTracker instrumentation class shouldn't have hampered TT start > up at all. > But, there is one class-fetching call outside try/catch, which makes TT fall > down with a RuntimeException if there's a class not found. Would be good to > include this line into the try/catch itself. > Strace would appear as: > {code} > 2011-08-25 11:45:38,470 ERROR org.apache.hadoop.mapred.TaskTracker: Can not > start task tracker because java.lang.RuntimeException: > java.lang.RuntimeException: java.lang.ClassNotFoundException: > org.apache.hadoop.mapred.CustomInstPlugin > at org.apache.hadoop.conf.Configuration.getClass(Configuration.java) > at > org.apache.hadoop.mapred.TaskTracker.getInstrumentationClass(TaskTracker.java) > > at org.apache.hadoop.mapred.TaskTracker.initialize(TaskTracker.java) > {code} -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira