Trigger Evaluation of Custom Function

Hooks allow to trigger functions calls on specific events. They can be specified via the ClusterFunctions and are triggered on the following events:

pre.sync

function(reg, fns, ...): Run before synchronizing the registry on the master. fn is the character vector of paths to the update files.

post.sync

function(reg, updates, ...): Run after synchronizing the registry on the master. updates is the data.table of processed updates.

pre.submit.job

function(reg, ...): Run before a job is successfully submitted to the scheduler on the master.

post.submit.job

function(reg, ...): Run after a job is successfully submitted to the scheduler on the master.

pre.submit

function(reg, ...): Run before any job is submitted to the scheduler.

post.submit

function(reg, ...): Run after a jobs are submitted to the schedule.

pre.do.collection

function(reg, reader, ...): Run before starting the job collection on the slave. reader is an internal cache object.

post.do.collection

function(reg, updates, reader, ...): Run after all jobs in the chunk are terminated on the slave. updates is a data.table of updates which will be merged with the Registry by the master. reader is an internal cache object.

pre.kill

function(reg, ids, ...): Run before any job is killed.

post.kill

function(reg, ids, ...): Run after jobs are killed. ids is the return value of killJobs.

runHook(obj, hook, ...)

Arguments

obj	[Registry | JobCollection] Registry which contains the ClusterFunctions with element “hooks” or a JobCollection which holds the subset of functions which are executed remotely.
hook	[character(1)] ID of the hook as string.
...	[ANY] Additional arguments passed to the function referenced by hook. See description.

Value

Return value of the called function, or NULL if there is no hook with the specified ID.