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refactor updating of task tuple to inmemory representation of said tuple

background-job-details
Nils Dijk 2022-08-09 18:11:33 +02:00 committed by Jelte Fennema
parent c09d0feb85
commit 1b66403cb9
3 changed files with 65 additions and 29 deletions
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40
src/backend/distributed/metadata/metadata_utility.c
View File

@ -2546,7 +2546,7 @@ DeformBackgroundTaskHeapTuple(TupleDesc tupleDescriptor, HeapTuple taskTuple)
task->taskid = DatumGetInt64(values[Anum_pg_dist_background_tasks_task_id - 1]);
if (!nulls[Anum_pg_dist_background_tasks_pid - 1])
{
task->pid = palloc0(sizeof(task->pid));
task->pid = palloc0(sizeof(int32));
*(task->pid) = DatumGetInt32(values[Anum_pg_dist_background_tasks_pid - 1]);
}
task->status = BackgroundTaskStatusByOid(
@ -2557,7 +2557,7 @@ DeformBackgroundTaskHeapTuple(TupleDesc tupleDescriptor, HeapTuple taskTuple)
if (!nulls[Anum_pg_dist_background_tasks_retry_count - 1])
{
task->retry_count = palloc0(sizeof(task->retry_count));
task->retry_count = palloc0(sizeof(int32));
*(task->retry_count) = DatumGetInt32(
values[Anum_pg_dist_background_tasks_retry_count - 1]);
}
@ -2718,8 +2718,7 @@ GetBackgroundTaskByTaskId(int64 taskId)
void
UpdateJobStatus(int64 taskId, const pid_t *pid, BackgroundTaskStatus status,
const int32 *retry_count, char *message)
UpdateBackgroundTask(BackgroundTask *task)
{
Relation pgDistBackgroundTasks =
table_open(DistBackgroundTasksRelationId(), RowExclusiveLock);
@ -2729,9 +2728,9 @@ UpdateJobStatus(int64 taskId, const pid_t *pid, BackgroundTaskStatus status,
ScanKeyData scanKey[1] = { 0 };
const bool indexOK = true;
/* WHERE task_id = $taskId */
/* WHERE task_id = $task->taskid */
ScanKeyInit(&scanKey[0], Anum_pg_dist_background_tasks_task_id,
BTEqualStrategyNumber, F_INT8EQ, Int64GetDatum(taskId));
BTEqualStrategyNumber, F_INT8EQ, Int64GetDatum(task->taskid));
SysScanDesc scanDescriptor =
systable_beginscan(pgDistBackgroundTasks,
@ -2742,7 +2741,7 @@ UpdateJobStatus(int64 taskId, const pid_t *pid, BackgroundTaskStatus status,
if (!HeapTupleIsValid(heapTuple))
{
ereport(ERROR, (errmsg("could not find background task entry for task_id: "
UINT64_FORMAT, taskId)));
UINT64_FORMAT, task->taskid)));
}
Datum values[Natts_pg_dist_background_tasks] = { 0 };
@ -2751,37 +2750,40 @@ UpdateJobStatus(int64 taskId, const pid_t *pid, BackgroundTaskStatus status,
heap_deform_tuple(heapTuple, tupleDescriptor, values, isnull);
bool updated = false;
#define UPDATE_FIELD(field, newNull, newValue) \
replace[(field - 1)] = (((newNull) != isnull[(field - 1)]) \
|| (values[(field - 1)] != (newValue))); \
isnull[(field - 1)] = (newNull); \
values[(field - 1)] = (newValue);
values[(field - 1)] = (newValue); \
updated |= replace[(field - 1)]
if (pid)
if (task->pid)
{
UPDATE_FIELD(Anum_pg_dist_background_tasks_pid, false, Int32GetDatum(*pid));
UPDATE_FIELD(Anum_pg_dist_background_tasks_pid, false, Int32GetDatum(*task->pid));
}
else
{
UPDATE_FIELD(Anum_pg_dist_background_tasks_pid, true, InvalidOid);
}
Oid statusOid = ObjectIdGetDatum(CitusTaskStatusOid(status));
Oid statusOid = ObjectIdGetDatum(CitusTaskStatusOid(task->status));
UPDATE_FIELD(Anum_pg_dist_background_tasks_status, false, statusOid);
if (retry_count)
if (task->retry_count)
{
UPDATE_FIELD(Anum_pg_dist_background_tasks_retry_count, false, Int32GetDatum(
*retry_count));
UPDATE_FIELD(Anum_pg_dist_background_tasks_retry_count, false,
Int32GetDatum(*task->retry_count));
}
else
{
UPDATE_FIELD(Anum_pg_dist_background_tasks_retry_count, true, InvalidOid);
}
if (message)
if (task->message)
{
Oid messageOid = CStringGetTextDatum(message);
Oid messageOid = CStringGetTextDatum(task->message);
UPDATE_FIELD(Anum_pg_dist_background_tasks_message, false, messageOid);
}
else
@ -2791,11 +2793,15 @@ UpdateJobStatus(int64 taskId, const pid_t *pid, BackgroundTaskStatus status,
#undef UPDATE_FIELD
heapTuple = heap_modify_tuple(heapTuple, tupleDescriptor, values, isnull, replace);
if (updated)
{
heapTuple = heap_modify_tuple(heapTuple, tupleDescriptor, values, isnull,
replace);
CatalogTupleUpdate(pgDistBackgroundTasks, &heapTuple->t_self, heapTuple);
CommandCounterIncrement();
}
systable_endscan(scanDescriptor);
table_close(pgDistBackgroundTasks, NoLock);

49
src/backend/distributed/utils/background_jobs.c
View File

@ -44,6 +44,30 @@ static BackgroundWorkerHandle * StartCitusBackgroundJobExecuter(char *database,
char *command);
static void ExecuteSqlString(const char *sql);
static void
BackgroundTaskUpdatePid(BackgroundTask *task, pid_t *pid)
{
if (pid)
{
if (!task->pid)
{
MemoryContext taskContext = GetMemoryChunkContext(task);
task->pid = MemoryContextAlloc(taskContext, sizeof(int32));
}
*task->pid = *pid;
}
else
{
/* clear any existing pid */
if (task->pid)
{
pfree(task->pid);
}
task->pid = NULL;
}
}
BackgroundWorkerHandle *
StartCitusBackgroundTaskMonitorWorker(Oid database, Oid extensionOwner)
{
@ -144,14 +168,14 @@ CitusBackgroundTaskMonitorMain(Datum arg)
PushActiveSnapshot(GetTransactionSnapshot());
/*
* We need to load the job into the perTaskContext as we will switch contexts
* We need to load the task into the perTaskContext as we will switch contexts
* later due to the committing and starting of new transactions
*/
MemoryContext oldContext = MemoryContextSwitchTo(perTaskContext);
BackgroundTask *job = GetRunnableBackgroundTask();
BackgroundTask *task = GetRunnableBackgroundTask();
MemoryContextSwitchTo(oldContext);
if (!job)
if (!task)
{
PopActiveSnapshot();
CommitTransactionCommand();
@ -167,7 +191,7 @@ CitusBackgroundTaskMonitorMain(Datum arg)
/* TODO find the actual database and username */
BackgroundWorkerHandle *handle =
StartCitusBackgroundJobExecuter("postgres", "nilsdijk", job->command);
StartCitusBackgroundJobExecuter("postgres", "nilsdijk", task->command);
if (handle == NULL)
{
@ -178,20 +202,23 @@ CitusBackgroundTaskMonitorMain(Datum arg)
pid_t pid = 0;
GetBackgroundWorkerPid(handle, &pid);
ereport(LOG, (errmsg("found job with jobid: %ld", job->taskid)));
ereport(LOG, (errmsg("found task with jobid: %ld", task->taskid)));
StartTransactionCommand();
PushActiveSnapshot(GetTransactionSnapshot());
/* Update job status to indicate it is running */
UpdateJobStatus(job->taskid, &pid, BACKGROUND_TASK_STATUS_RUNNING, NULL, NULL);
task->status = BACKGROUND_TASK_STATUS_RUNNING;
BackgroundTaskUpdatePid(task, &pid);
/* Update task status to indicate it is running */
UpdateBackgroundTask(task);
PopActiveSnapshot();
CommitTransactionCommand();
MemoryContextSwitchTo(perTaskContext);
/* TODO keep polling the job */
/* TODO keep polling the task */
while (GetBackgroundWorkerPid(handle, &pid) != BGWH_STOPPED)
{
int latchFlags = WL_LATCH_SET | WL_TIMEOUT | WL_POSTMASTER_DEATH;
@ -213,8 +240,10 @@ CitusBackgroundTaskMonitorMain(Datum arg)
StartTransactionCommand();
PushActiveSnapshot(GetTransactionSnapshot());
/* TODO job can actually also have failed*/
UpdateJobStatus(job->taskid, NULL, BACKGROUND_TASK_STATUS_DONE, NULL, NULL);
/* TODO task can actually also have failed*/
task->status = BACKGROUND_TASK_STATUS_DONE;
BackgroundTaskUpdatePid(task, NULL);
UpdateBackgroundTask(task);
PopActiveSnapshot();
CommitTransactionCommand();

1
src/include/distributed/metadata_utility.h
View File

@ -341,6 +341,7 @@ extern bool BackgroundTaskHasUmnetDependencies(int64 taskId);
extern BackgroundTask * GetRunnableBackgroundTask(void);
extern void ResetRunningBackgroundTasks(void);
extern BackgroundTask * GetBackgroundTaskByTaskId(int64 taskId);
extern void UpdateBackgroundTask(BackgroundTask *task);
extern void UpdateJobStatus(int64 taskId, const pid_t *pid, BackgroundTaskStatus status,
const int32 *retry_count, char *message);
extern bool UpdateJobError(BackgroundTask *job, ErrorData *edata);