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From "Peter Bacsko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-7052) TestFixedLengthInputFormat#testFormatCompressedIn is flaky
Date Tue, 13 Feb 2018 16:02:00 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-7052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Peter Bacsko updated MAPREDUCE-7052:
------------------------------------
    Status: Patch Available  (was: Open)

> 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
>         Attachments: MAPREDUCE-7052-001.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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