Examples with NO_SNAPSHOT com.hazelcast.jet.impl.execution.SnapshotContext.NO_SNAPSHOT used on opensource projects

Example 1 with NO_SNAPSHOT

use of com.hazelcast.jet.impl.execution.SnapshotContext.NO_SNAPSHOT in project hazelcast-jet by hazelcast.

the class MasterContext method tryStartJob.

/**
 * Starts execution of the job if it is not already completed, cancelled or failed.
 * If the job is already cancelled, the job completion procedure is triggered.
 * If the job quorum is not satisfied, job restart is rescheduled.
 * If there was a membership change and the partition table is not completely
 * fixed yet, job restart is rescheduled.
 */
void tryStartJob(Function<Long, Long> executionIdSupplier) {
    if (!setJobStatusToStarting()) {
        return;
    }
    if (scheduleRestartIfQuorumAbsent() || scheduleRestartIfClusterIsNotSafe()) {
        return;
    }
    DAG dag;
    try {
        dag = deserializeDAG();
    } catch (Exception e) {
        logger.warning("DAG deserialization failed", e);
        finalizeJob(e);
        return;
    }
    // save a copy of the vertex list, because it is going to change
    vertices = new HashSet<>();
    dag.iterator().forEachRemaining(vertices::add);
    executionId = executionIdSupplier.apply(jobId);
    // last started snapshot complete or not complete. The next started snapshot must be greater than this number
    long lastSnapshotId = NO_SNAPSHOT;
    if (isSnapshottingEnabled()) {
        Long snapshotIdToRestore = snapshotRepository.latestCompleteSnapshot(jobId);
        snapshotRepository.deleteAllSnapshotsExceptOne(jobId, snapshotIdToRestore);
        Long lastStartedSnapshot = snapshotRepository.latestStartedSnapshot(jobId);
        if (snapshotIdToRestore != null) {
            logger.info("State of " + jobIdString() + " will be restored from snapshot " + snapshotIdToRestore);
            rewriteDagWithSnapshotRestore(dag, snapshotIdToRestore);
        } else {
            logger.info("No previous snapshot for " + jobIdString() + " found.");
        }
        if (lastStartedSnapshot != null) {
            lastSnapshotId = lastStartedSnapshot;
        }
    }
    MembersView membersView = getMembersView();
    ClassLoader previousCL = swapContextClassLoader(coordinationService.getClassLoader(jobId));
    try {
        int defaultLocalParallelism = getJetInstance(nodeEngine).getConfig().getInstanceConfig().getCooperativeThreadCount();
        logger.info("Start executing " + jobIdString() + ", status " + jobStatus() + "\n" + dag.toString(defaultLocalParallelism));
        logger.fine("Building execution plan for " + jobIdString());
        executionPlanMap = createExecutionPlans(nodeEngine, membersView, dag, getJobConfig(), lastSnapshotId);
    } catch (Exception e) {
        logger.severe("Exception creating execution plan for " + jobIdString(), e);
        finalizeJob(e);
        return;
    } finally {
        Thread.currentThread().setContextClassLoader(previousCL);
    }
    logger.fine("Built execution plans for " + jobIdString());
    Set<MemberInfo> participants = executionPlanMap.keySet();
    Function<ExecutionPlan, Operation> operationCtor = plan -> new InitExecutionOperation(jobId, executionId, membersView.getVersion(), participants, nodeEngine.getSerializationService().toData(plan));
    invoke(operationCtor, this::onInitStepCompleted, null);
}