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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5453) Could FSEditLog report problems more elegantly than with System.exit(-1)
Date Wed, 11 Mar 2009 08:16:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680787#action_12680787

dhruba borthakur commented on HADOOP-5453:

The namenode could go into a read-only mode and not allow any operations that need to create
a transaction.

> Could FSEditLog report problems more elegantly than with System.exit(-1)
> ------------------------------------------------------------------------
>                 Key: HADOOP-5453
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5453
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.21.0
>            Reporter: Steve Loughran
>            Priority: Minor
> When FSEdit encounters problems, it prints something and then exits.
> It would be better for any in-JVM deployments of FSEdit for these to be raised in some
other way (such as throwing an exception), rather than taking down the whole JVM. That could
be in JUnit tests, or it could be inside other applications. Test runners and the like can
intercept those System.exit() calls with their own Security Manager -often turning the System.exit()
operation into an exception there and then. If FSEdit did that itself, it may be easier to
stay in control. 
> The current approach has some benefits -it can exit regardless of which thread has encountered
problems, but it is tricky to test.

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