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https://issues.apache.org/jira/browse/HADOOP-6029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720484#action_12720484
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Jothi Padmanabhan commented on HADOOP-6029:
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Here are a couple of links that explain -Xmx value and maxMemory() will be
different.
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4391499
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4686462
A comment from the second link --
" ... freeMemory() and totalMemory()
report the amount of memory _inside_ the jvm while
maxMemory() reports on the amount of memory _outside_ the
jvm, i.e. the amount the whole jvm uses as seen from the OS."
> TestReduceFetch failed.
> -----------------------
>
> Key: HADOOP-6029
> URL: https://issues.apache.org/jira/browse/HADOOP-6029
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Tsz Wo (Nicholas), SZE
> Attachments:
> FAILING-PARTIALMEM-TEST-org.apache.hadoop.mapred.TestReduceFetch.txt,
> TEST-org.apache.hadoop.mapred.TestReduceFetch.txt,
> TEST-org.apache.hadoop.mapred.TestReduceFetch.txt
>
>
> {noformat}
> Testcase: testReduceFromMem took 23.625 sec
> FAILED
> Non-zero read from local: 83
> junit.framework.AssertionFailedError: Non-zero read from local: 83
> at
> org.apache.hadoop.mapred.TestReduceFetch.testReduceFromMem(TestReduceFetch.java:289)
> at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
> at junit.extensions.TestSetup$1.protect(TestSetup.java:23)
> at junit.extensions.TestSetup.run(TestSetup.java:27)
> {noformat}
> Ran TestReduceFetch a few times on a clean trunk. It failed consistently.
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