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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3531) Hod does not report job tracker failure on hod client side when job tracker fails to come up
Date Thu, 12 Jun 2008 15:50:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604548#action_12604548
] 

Hemanth Yamijala commented on HADOOP-3531:
------------------------------------------

bq. Inserting delays to fix synchro problems is a perilous course. Can we do something better,
like alternate between checking for an error code, and checking if the jetty interface came
up?

Ari, excellent suggestion. I have done just that in the attached patch. So, what happens now
is that even if the command's exit code is missed the first time, I continue to check for
exit status while checking for the jetty interface status. Thus, at some point if the command
is found to have exited, the code returns immediately with a good error message.

I tested this patch by introducing spurious failures on a test cluster. I was able to validate
that the correct code paths were covered. However, some testing in a more controlled environment
where we can control the allocated nodes and set them up for failure could help. Karam, can
you please take this patch, and re-run your tests.

> Hod does not  report job tracker failure on hod client side when job tracker fails to
come up
> ---------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3531
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3531
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/hod
>    Affects Versions: 0.18.0
>            Reporter: Karam Singh
>            Assignee: Hemanth Yamijala
>            Priority: Blocker
>             Fix For: 0.18.0
>
>         Attachments: 3531.patch
>
>
> Hod does not  report job tracker failure on hod client side when job tracker fails to
come up. 
> When max-master-failure > 1
> hod client does not properly show why job tracker failed to come up, while in case namenode
proper error message is displayed.
> Also in namenode failure ringmaster log contains information such as -: "Detected errors
(3) beyond allowed number of failures (2). Flagging error to client"
> while no such information is there in ringmaster log for job tracker failures

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