@InterfaceAudience.Public @InterfaceStability.Unstable public interface FenceMethod
Since these methods are often vendor- or device-specific, operators may implement this interface in order to achieve fencing.
Fencing is configured by the operator as an ordered list of methods to
attempt. Each method will be tried in turn, and the next in the list
will only be attempted if the previous one fails. See
for more information.
If an implementation also implements
Configurable then its
setConf method will be called upon instantiation.
void checkArgs(String args) throws BadFencingConfigurationException
args- the arguments provided in the configuration. This may be null if the operator did not configure any arguments.
BadFencingConfigurationException- if the arguments are invalid
boolean tryFence(HAServiceTarget target, String args) throws BadFencingConfigurationException
target- the address (host:ipcport) of the service to fence
args- the configured arguments, which were checked at startup by
BadFencingConfigurationException- if the configuration was determined to be invalid only at runtime
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