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From "Ari Rabkin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CHUKWA-330) controller should not create duplicates for adaptors with offsets
Date Wed, 24 Jun 2009 22:34:07 GMT

    [ https://issues.apache.org/jira/browse/CHUKWA-330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723779#action_12723779
] 

Ari Rabkin commented on CHUKWA-330:
-----------------------------------

Eric, Jerome -- both your suggestions involve significant changes to the adaptor interface,
as well as to the semantics of adaptor creation.  The biggest reason I wanted to fix this
in the controller is that it's a very small change -- the patch only changes a handful of
lines.

How would you feel about doing the controller fix in 0.2, and something more principled for
trunk?

> controller should not create duplicates for adaptors with offsets
> -----------------------------------------------------------------
>
>                 Key: CHUKWA-330
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-330
>             Project: Hadoop Chukwa
>          Issue Type: Bug
>          Components: input tools
>            Reporter: Ari Rabkin
>            Assignee: Ari Rabkin
>            Priority: Blocker
>             Fix For: 0.2.0, 0.3.0
>
>         Attachments: CHUKWA-330.patch
>
>   Original Estimate: 1.5h
>  Remaining Estimate: 1.5h
>
> The offset-of-first-byte param to FileTailingAdaptor is hashed into the default adaptor
name.  This changes the semantics of adaptor uniqueness, and broke metrics and the log4jappender.
> Proposed fix:
>   Add a new "addByName()" method to ChukwaAgentController that lets callers specify names.
 
>   Use this new method whenever finer control of adaptor uniqueness is needed.

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