dosubot[bot] commented on issue #2667:
URL:
https://github.com/apache/incubator-hugegraph/issues/2667#issuecomment-2380715442
<!-- Answer -->
Yes, if you disable the master-worker pattern in HugeGraph, there are
alternative task scheduling and execution mechanisms available:
1. **StandardTaskScheduler with a Single Node Setup**:
- In a single-node setup, tasks are submitted and executed immediately
without the need for master-worker coordination.
- Example:
```java
if (this.serverManager().onlySingleNode() && !task.computer()) {
task.status(TaskStatus.QUEUED);
task.server(this.serverManager().selfNodeId());
this.save(task);
return this.submitTask(task);
}
```
2. **Local Task Scheduler**:
- Manages task execution within the same node without distributing tasks
across multiple nodes. Suitable for environments where a single node handles
all tasks.
- Example:
```java
TaskScheduler scheduler = new StandardTaskScheduler(
graph,
this.taskExecutor,
this.taskDbExecutor,
this.serverInfoDbExecutor
);
this.schedulers.put(graph, scheduler);
```
3. **DistributedTaskScheduler**:
- Handles tasks in a distributed manner even without the master-worker
pattern. Uses different executor services for various types of tasks (e.g.,
schema tasks, OLAP tasks, Gremlin tasks) and a scheduled thread pool executor
for periodic task scheduling.
- Example:
```java
public DistributedTaskScheduler(HugeGraphParams graph,
ScheduledThreadPoolExecutor
schedulerExecutor,
ExecutorService taskDbExecutor,
ExecutorService schemaTaskExecutor,
ExecutorService olapTaskExecutor,
ExecutorService gremlinTaskExecutor,
ExecutorService ephemeralTaskExecutor,
ExecutorService serverInfoDbExecutor) {
super(graph, serverInfoDbExecutor);
this.taskDbExecutor = taskDbExecutor;
this.schemaTaskExecutor = schemaTaskExecutor;
this.olapTaskExecutor = olapTaskExecutor;
this.gremlinTaskExecutor = gremlinTaskExecutor;
this.ephemeralTaskExecutor = ephemeralTaskExecutor;
this.schedulerExecutor = schedulerExecutor;
this.closed.set(false);
this.schedulePeriod = this.graph.configuration()
.get(CoreOptions.TASK_SCHEDULE_PERIOD);
this.cronFuture = this.schedulerExecutor.scheduleWithFixedDelay(
() -> {
LockUtil.lock("", LockUtil.GRAPH_LOCK);
try {
this.cronSchedule();
} catch (Throwable t) {
LOG.info("cronScheduler exception graph: {}",
this.graphName(), t);
} finally {
LockUtil.unlock("", LockUtil.GRAPH_LOCK);
}
},
10L, schedulePeriod,
TimeUnit.SECONDS);
}
```
These mechanisms ensure that tasks are handled efficiently even when the
master-worker pattern is not in use
<sup>[[1]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/task/StandardTaskScheduler.java)</sup><sup>[[2]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/task/TaskManager.java)</sup><sup>[[3]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/task/DistributedTaskScheduler.java)</sup>.
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