• There are 3 steps in BrokerLoadJob: BrokerPendingTask, LoadLoadingTask, CommitAndPublishTxn.
• Step1: BrokerPendingTask will be created on method of unprotectedExecuteJob.
• Step2: LoadLoadingTasks will be created by the method of onTaskFinished when BrokerPendingTask is finished.
• Step3: CommitAndPublicTxn will be called by the method of onTaskFinished when all of LoadLoadingTasks are finished.

BrokerLoadJob.onTaskFinished

 if (attachment instanceof BrokerPendingTaskAttachment) {
            onPendingTaskFinished((BrokerPendingTaskAttachment) attachment);
        } else if (attachment instanceof BrokerLoadingTaskAttachment) {
            onLoadingTaskFinished((BrokerLoadingTaskAttachment) attachment);
        }

BrokerLoadJob.cancelJobWithoutCheck

Job状态转换为cancel

#LoadJob.unprotectedExecuteCancel 
   // change state
        state = JobState.CANCELLED;

BrokerLoadJob.onLoadingTaskFinished

 Catalog.getCurrentGlobalTransactionMgr().commitTransaction(
                    dbId, transactionId, commitInfos,
                    new LoadJobFinalOperation(id, loadingStatus, progress, loadStartTimestamp,
                            finishTimestamp, state, failMsg));

DatabaseTransactionMgr.commitTransaction

transactionState.afterStateTransform

   public void afterStateTransform(TransactionStatus transactionStatus, boolean txnOperated,
                                    String txnStatusChangeReason)
            throws UserException {
        // after status changed
        TxnStateChangeCallback callback = Catalog.getCurrentGlobalTransactionMgr()
                .getCallbackFactory().getCallback(callbackId);
        if (callback != null) {
            switch (transactionStatus) {
                case ABORTED:
                   //ABORTED的时候会调用unprotectedExecuteCancel ,canal Job
                   //更新JobState 为CANCELLED
                    callback.afterAborted(this, txnOperated, txnStatusChangeReason);
                    break;
                 //COMMITTED 的时候更新JobState 为COMMITTED
                case COMMITTED:
                    callback.afterCommitted(this, txnOperated);
                    break;
                //VISIBLE 的时候更新JobState 为FINISHED
                case VISIBLE:
                    callback.afterVisible(this, txnOperated);
                    break;
                default:
                    break;
            }
        }
    }