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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3582) Hook daemon process exit for testing
Date Tue, 10 Jul 2012 08:06:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13410122#comment-13410122
] 

Aaron T. Myers commented on HDFS-3582:
--------------------------------------

bq. I wouldn't justify this fix purely for testing, though HADOOP-8096 shows utility at run
time.

Why not? We sometimes have tests that fail that we can't adequately debug because of this.
That seems like reason enough to me that we should address this issue.

bq. It is not the Hadoop team's fault that Surefire can't handle process exit calls, especially
given that Apache Ant has happily done so for twelve years.

Certainly not our fault, but we still suffer the consequences. Since we have a (pretty simple)
way to work around the limitation, I think we should implement it.
                
> Hook daemon process exit for testing 
> -------------------------------------
>
>                 Key: HDFS-3582
>                 URL: https://issues.apache.org/jira/browse/HDFS-3582
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: test
>    Affects Versions: 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>            Priority: Minor
>         Attachments: hdfs-3582.txt, hdfs-3582.txt, hdfs-3582.txt, hdfs-3582.txt, hdfs-3582.txt
>
>
> Occasionally the tests fail with "java.util.concurrent.ExecutionException: org.apache.maven.surefire.booter.SurefireBooterForkException:
> Error occurred in starting fork, check output in log" because the NN is exit'ing (via
System#exit or Runtime#exit). Unfortunately Surefire doesn't retain the log output (see SUREFIRE-871)
so the test log is empty, we don't know which part of the test triggered which exit in HDFS.
To make this easier to debug let's hook all daemon process exits when running the tests.

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