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zhihai xu commented on MAPREDUCE-6535: -------------------------------------- +1 to use TaskType.REDUCE as the default task type and make it compatible with MR1. > TaskID default constructor results in NPE on toString() > ------------------------------------------------------- > > Key: MAPREDUCE-6535 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-6535 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: mrv2 > Affects Versions: 2.6.0 > Reporter: Daniel Templeton > Assignee: Daniel Templeton > > This code will reproduce the issue: > {code} > new TaskAttemptID().toString(); > {code} > The issue is that the default constructor leaves the type {{null}}. The > {{get()}} in {{CharTaskTypesMaps.getRepresentingCharacter()}} then throws an > NPE on the null type key. > The simplest solution would be to only call the {{get()}} on line 288 of > {{TaskID.java}} if {{type}} is not {{null}} and return some other literal > otherwise. Since no part of the code is tripping on the NPE, what we choose > for the literal shouldn't matter. How about "x"? -- This message was sent by Atlassian JIRA (v6.3.4#6332)