[TEZ-1148] Exception thrown when old MapRunnable implementation is specified for a MapProcessor vertex

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.4.0, 0.5.0
• Target Version/s: 0.8.6
• Assignee: Mariappan Asokan
• Reporter: Mariappan Asokan
• Created: 23/May/14 15:53
• Updated: 14/Mar/17 03:40

Description

When a MapProcessor vertex was configured with an implementation of MapRunnable, following exception was thrown:

Exception in thread "main" java.io.IOException: mapreduce.job.inputformat.class is incompatible with map compatability mode.
        at org.apache.tez.mapreduce.hadoop.MRHelpers.ensureNotSet(MRHelpers.java:629)
        at org.apache.tez.mapreduce.hadoop.MRHelpers.setUseNewAPI(MRHelpers.java:603)
....

The problem seems to be in MRHelpers.setUseNewAPI(). The check for the existence of a MapRunnable implementation is missing which leads to an incorrect conclusion that new APIs are used. This problem exists in the trunk version as well.