Separate tasks of both install and configuration scripts into more generic and
detailed functions
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Key: WHIRR-266
URL: https://issues.apache.org/jira/browse/WHIRR-266
Project: Whirr
Issue Type: New Feature
Components: core
Reporter: Hyunsik Choi
Fix For: 0.5.0
Using whirr, I experimented some problems. Especially, if at least one of the
steps for installing and configuring a service meets some exception or error,
whirr cannot construct the running cluster. In another case, some of entire
clusters do not startup by whirr due to unknown reasons. In both cases, users
have to recover them manually. It may be really burden for users.
However, the current implementation does not support any recovery ways. In
addition, service scripts (install and post-configure) bundles up too many
tasks. For example, for hadoop service the configuration script mounts devices,
configures *-site.xml files, and executes the service start script. It makes
users hard to reuse that scripts.
Thus, I propose that we separate both scripts (i.e., install and
post-configure) into more normalized and detailed functions, such as
*service-clean, service-install, service-configuration, service-start, and
service-stop*. In addition, they should be executed individually by a user.
I expect that it will give us many benefits: 1) it makes debugging easier 2)
when an exception or error occurs during starting a service, a user can recover
easily the cluster by using appropriate functions.
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