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https://issues.apache.org/jira/browse/HADOOP-4409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639322#action_12639322
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Hemanth Yamijala commented on HADOOP-4409:
------------------------------------------
The issue is somewhat random, though it is replicable on some machines
consistently. One way I could consistently replicate it is to modify the
{{TestMiniMRWithDFS.testWithDFS}} method to run only the word count example,
and comment out the PI example. Such a modification caused the following
failure:
{code}
task tracker dir
/home/yhemanth/work/hadoop/hadoop-trunk/build/test/mapred/local/1_0/taskTracker
does not exist.
junit.framework.AssertionFailedError: task tracker dir
/home/yhemanth/work/hadoop/hadoop-trunk/build/test/mapred/local/1_0/taskTracker
does not exist.
at
org.apache.hadoop.mapred.TestMiniMRWithDFS.checkTaskDirectories(TestMiniMRWithDFS.java:140)
at
org.apache.hadoop.mapred.TestMiniMRWithDFS.runWordCount(TestMiniMRWithDFS.java:196)
at
org.apache.hadoop.mapred.TestMiniMRWithDFS.testWithDFS(TestMiniMRWithDFS.java:244)
{code}
> The test TestMiniMRWithDFS.checkTaskDirectories is checking for task
> directories incorrectly
> --------------------------------------------------------------------------------------------
>
> Key: HADOOP-4409
> URL: https://issues.apache.org/jira/browse/HADOOP-4409
> Project: Hadoop Core
> Issue Type: Test
> Components: mapred, test
> Reporter: Hemanth Yamijala
>
> The check for task directories in {{TestMiniMRWithDFS.checkTaskDirectories}}
> seems incorrect. The following code:
> {code}
> assertTrue("task tracker dir " + trackerDir + " does not exist.",
> trackerDir.isDirectory());
> {code}
> in the test case seems to assume that every configured task tracker has the
> task tracker directory {{TaskTracker.SUBDIR}} created. However, this
> directory is only created if any task is assigned to the task tracker. As
> there is no real control over which task trackers will actually be assigned
> tasks, it seems an incorrect check.
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