[jira] Commented: (HADOOP-4409) The test TestMiniMRWithDFS.checkTaskDirectories is checking for task directories incorrectly

["Hemanth Yamijala (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639322#action_12639322 ] 

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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