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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Updated: (WHIRR-225) Support locally-supplied scripts
Date Tue, 01 Feb 2011 00:11:33 GMT

     [ https://issues.apache.org/jira/browse/WHIRR-225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tom White updated WHIRR-225:
----------------------------

    Attachment: WHIRR-225.patch

We can implement this by using jclouds scriptbuilder classes. For example, by putting bash
functions in files named after the function in _src/main/resources/functions_ we can call
them with

{code}
addStatement(event, call("function-name"));
{code}

It's also makes it possible for users to override the function by editing the file in _functions_,
e.g. _functions/function-name.sh_, (since the CLI puts the top-level directory on the front
of the classpath, so any functions defined here will take precedence to the ones in the JAR).

If we refactor the existing scripts to be functions like this, then we will no longer have
to serve them from a webserver. However, for larger clusters it may be preferable to download
files from a webserver, so that the client doesn't have to send a potentially large script
to each node in the cluster. Instead it could upload the script to a blobstore, then send
a runurl command to each node in the cluster (see https://github.com/jclouds/jclouds/raw/master/demos/test/ComputeAndBlobStoreTogetherHappilyLiveTest.java
for one way of doing this). We could do this enhancement as a separate JIRA.

I've attached a patch which shows how this would look for an example script function. It runs
a (possibly user-defined) script in the bootstrap phase of ZooKeeper.

Thoughts?

> Support locally-supplied scripts
> --------------------------------
>
>                 Key: WHIRR-225
>                 URL: https://issues.apache.org/jira/browse/WHIRR-225
>             Project: Whirr
>          Issue Type: New Feature
>            Reporter: Tom White
>            Assignee: Tom White
>         Attachments: WHIRR-225.patch
>
>
> Whirr currently uses runurl to download bootstrap and configuration scripts from a webserver.
It should be possible to use scripts supplied from the launch machine (or even from another
source).

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