// ****************************************************************************
// *** ~khTask
// ****************************************************************************
khTask::~khTask(void) throw()
{
assert(taskid_);
if (jobHandler) {
// stops the job
// removes me from his list
// takes ownership of my reservations (until job finished)
jobHandler->StopTask(this);
} else {
theResourceManager.EraseWaitingTask(this);
// Reservation destructors will release reservation and
// remove the files they represent. This would happen
// automatically at the end of this destructor. But I just felt like
// being explicit
reservations_.clear();
}
taskVerrefMap.erase(verref_);
// remove my persistence
if (!khUnlink(TaskFilename())) {
notify(NFY_WARN, "Unable to unlink %s", TaskFilename().c_str());
}
// help to see if we're deleting the task twice
taskid_ = 0;
}
/*
* worker_fetch_query_results_file fetches a query results file from the remote
* node. The function assumes an upstream compute task depends on this query
* results file, and therefore directly fetches the file into the upstream
* task's directory.
*/
Datum
worker_fetch_query_results_file(PG_FUNCTION_ARGS)
{
uint64 jobId = PG_GETARG_INT64(0);
uint32 queryTaskId = PG_GETARG_UINT32(1);
uint32 upstreamTaskId = PG_GETARG_UINT32(2);
text *nodeNameText = PG_GETARG_TEXT_P(3);
uint32 nodePort = PG_GETARG_UINT32(4);
char *nodeName = NULL;
/* remote filename is <jobId>/<queryTaskId> */
StringInfo remoteDirectoryName = JobDirectoryName(jobId);
StringInfo remoteFilename = TaskFilename(remoteDirectoryName, queryTaskId);
/* local filename is <jobId>/<upstreamTaskId>/<queryTaskId> */
StringInfo taskDirectoryName = TaskDirectoryName(jobId, upstreamTaskId);
StringInfo taskFilename = TaskFilename(taskDirectoryName, queryTaskId);
/*
* If we are the first function to fetch a file for the upstream task, the
* task directory does not exist. We then lock and create the directory.
*/
bool taskDirectoryExists = DirectoryExists(taskDirectoryName);
if (!taskDirectoryExists)
{
InitTaskDirectory(jobId, upstreamTaskId);
}
nodeName = text_to_cstring(nodeNameText);
FetchRegularFile(nodeName, nodePort, remoteFilename, taskFilename);
PG_RETURN_VOID();
}
// ****************************************************************************
// *** khTask
// ****************************************************************************
khTask::khTask(const SubmitTaskMsg &msg)
: verref_(msg.verref), taskid_(msg.taskid),
priority_(msg.priority), taskdef_(msg.taskdef),
requirements(taskdef_, taskid_, verref_), // <-- can throw exception
submitTime_(time(0)),
beginTime_(0),
progressTime_(0),
progress_(0),
jobHandler(0)
{
// It's assumed that the caller already removed any existing
// task for this verref
// make our persistent copy (it's just a symlink)
if (!khSymlink(verref_, TaskFilename())) {
throw khErrnoException(kh::tr("Unable to write ") + TaskFilename());
}
// now that we're persistent, add myself to the lists
taskVerrefMap.insert(std::make_pair(verref_, this));
theResourceManager.InsertWaitingTask(this);
}