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From "Peter Bacsko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-7052) TestFixedLengthInputFormat#testFormatCompressedIn is flaky
Date Tue, 13 Feb 2018 12:14:00 GMT
Peter Bacsko created MAPREDUCE-7052:

             Summary: TestFixedLengthInputFormat#testFormatCompressedIn is flaky
                 Key: MAPREDUCE-7052
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7052
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: client, test
            Reporter: Peter Bacsko
            Assignee: Peter Bacsko

Sometimes the test case TestFixedLengthInputFormat#testFormatCompressedIn can fail with the
following error:

java.lang.OutOfMemoryError: Requested array size exceeds VM limit
	at org.apache.hadoop.mapred.TestFixedLengthInputFormat.runRandomTests(TestFixedLengthInputFormat.java:322)
	at org.apache.hadoop.mapred.TestFixedLengthInputFormat.testFormatCompressedIn(TestFixedLengthInputFormat.java:90)

*Root cause:* under special circumstances, the following line can return a huge number:

          // Test a split size that is less than record len
          numSplits = (int)(fileSize/Math.floor(recordLength/2));

For example, let {{seed}} be 2026428718. This causes {{recordLength}} to be 1 at iteration
19. {{Math.floor()}} returns negative Infinity, which becomes positve infinity after the divison.
Casting it to {{int}} yields {{Integer.MAX_VALUE}}. Eventually we get an OOME because the
test wants to create a huge {{InputSplit}} array.

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