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From "John Vines (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1321) Dynamic Classloader lost jars
Date Mon, 29 Apr 2013 23:22:15 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645034#comment-13645034
] 

John Vines commented on ACCUMULO-1321:
--------------------------------------

With the recreating of VFS to get around the issues, they are not counting. But that's a hack
around the other issue.

I don't think class unloading would actually help. The issue is that the Resource and the
actual file get out of sync, so when it uses the Resource to determine if the jar is accurate
it gets a truncated file exception. I would think it would be a class unloading issue if it
failed to show any changes with a new jar.
                
> Dynamic Classloader lost jars
> -----------------------------
>
>                 Key: ACCUMULO-1321
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1321
>             Project: Accumulo
>          Issue Type: Sub-task
>            Reporter: John Vines
>            Assignee: Keith Turner
>            Priority: Blocker
>             Fix For: 1.5.0
>
>         Attachments: ACCUMULO-1321.patch
>
>
> We have a table setup that uses some custom iterators. We ran an MR job against it without
issues. We then ran the job immediately after the first one wrapped and 2 of my tservers errored
with ClassNotFoundException, even though it ran just fine before.
> Unfortunately we don't have a stack trace (to see if it was breaking differently in the
VFSClassLoader), nor a convenient way to recreate currently. We're working on reproducing
it in order to get more information.

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