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:
{noformat}
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)
{noformat}
*Root cause:* under special circumstances, the following line can return a huge
number:
{noformat}
// Test a split size that is less than record len
numSplits = (int)(fileSize/Math.floor(recordLength/2));
{noformat}
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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