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https://issues.apache.org/jira/browse/MAPREDUCE-7052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Lowe updated MAPREDUCE-7052:
----------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Fix Version/s: 2.7.6
2.8.4
2.9.1
2.10.0
3.0.1
3.1.0
Status: Resolved (was: Patch Available)
Thanks, [~pbacsko]! I committed this to trunk, branch-3.1, branch-3.0,
branch-3.0.1, branch-2, branch-2.9, branch-2.8, and branch-2.7.
> 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
> Priority: Major
> Fix For: 3.1.0, 3.0.1, 2.10.0, 2.9.1, 2.8.4, 2.7.6
>
> Attachments: MAPREDUCE-7052-001.patch, MAPREDUCE-7052-002.patch
>
>
> 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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