[jira] Issue Comment Edited: (WHIRR-246) Single place to store/load cluster state

["David Alves (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/WHIRR-246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13002665#comment-13002665 ] 

David Alves edited comment on WHIRR-246 at 3/4/11 3:29 PM:
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Btw I just remembered something that might be relevant.

When updating a cluster we will do so based on the current state, up to now using the local filesystem was not a problem because no decisions (that I know of) were made based on this file. This will change with WHIRR-214 and so a problem might arise where if the cluster is started on one machine and updated on another, update decisions might be based on a non-existing or stale state.

      was (Author: dr-alves):
    Btw I just remembered something that might be relevant.

When updating a cluster we will do so based on the current state, up to now using the local filesystem was not a problem because no decisions (that I know of) were made based on this file. This will change with WHIRR-214 and so a problem might arise where if the cluster is started on one machine and updated on another, update decisions might be based on a non-existing or state state.
  
> Single place to store/load cluster state
> ----------------------------------------
>
>                 Key: WHIRR-246
>                 URL: https://issues.apache.org/jira/browse/WHIRR-246
>             Project: Whirr
>          Issue Type: Improvement
>            Reporter: David Alves
>            Priority: Minor
>         Attachments: WHIRR-246.patch
>
>
> Right now cluster state is written and read from the ~/.whirr/cluster-name/instances file and logic to write and update it is spread between the Service and DestroyInstanceCommand (that I know of).
> Since for WHIRR-214 the file must be updated (in another class) and for WHIRR-238 an altogether different method of storing cluster state will be required I think it might be time to move the read/write state logic to its own file (or factory in the future).
> I'll attach a very preliminary patch just to get some feedback.

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