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From "Ari Rabkin (JIRA)" <>
Subject [jira] Commented: (CHUKWA-5) AdaptorId should be persistent even after an agent restart
Date Wed, 10 Jun 2009 23:27:07 GMT


Ari Rabkin commented on CHUKWA-5:

Just talked to Mac and Jerome.  Conclusions:

- Agent datastructures will use strings to identify adaptors.  Client will use MD5.  
- Gonna push this into 0.2, but patch will likely happen post-branch.

> AdaptorId should be persistent even after an agent restart
> ----------------------------------------------------------
>                 Key: CHUKWA-5
>                 URL:
>             Project: Hadoop Chukwa
>          Issue Type: Bug
>          Components: data collection
>            Reporter: Jerome Boulon
>            Assignee: Cheng
> In case of agent restart, an adaptor may not get the same adaptorId. 
> 1)The adaptorId is sent back to the remote application after the Add command.
> Now, let suppose the agent dies and restarts. 
> Each new adaptor created from the checkpoint will now have another adaptorId
> . 
> If the remote application tries to stop/shutdown only using the adaptorId received in
step (1), the command may be sent to the wrong adaptor.
> if the adaptorId in for example an MD5 of the command line we don't need to save any
additional information inside the checkpoint.
> This will change the current API from int to String.

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