@Override
public boolean deleteHost(Long hostId) {
List<SnapshotVO> snapshots = _snapshotDao.listByHostId(hostId);
if (snapshots != null && !snapshots.isEmpty()) {
throw new CloudRuntimeException(
"Can not delete this secondary storage due to there are still snapshots on it ");
}
List<Long> list = _templateDao.listPrivateTemplatesByHost(hostId);
if (list != null && !list.isEmpty()) {
throw new CloudRuntimeException(
"Can not delete this secondary storage due to there are still private template on it ");
}
_vmTemplateHostDao.deleteByHost(hostId);
HostVO host = _hostDao.findById(hostId);
host.setGuid(null);
_hostDao.update(hostId, host);
_hostDao.remove(hostId);
return true;
}
private void checkStatusOfCurrentlyExecutingSnapshots() {
SearchCriteria<SnapshotScheduleVO> sc = _snapshotScheduleDao.createSearchCriteria();
sc.addAnd("asyncJobId", SearchCriteria.Op.NNULL);
List<SnapshotScheduleVO> snapshotSchedules = _snapshotScheduleDao.search(sc, null);
for (SnapshotScheduleVO snapshotSchedule : snapshotSchedules) {
Long asyncJobId = snapshotSchedule.getAsyncJobId();
AsyncJobVO asyncJob = _asyncJobDao.findById(asyncJobId);
switch (asyncJob.getStatus()) {
case AsyncJobResult.STATUS_SUCCEEDED:
// The snapshot has been successfully backed up.
// The snapshot state has also been cleaned up.
// We can schedule the next job for this snapshot.
// Remove the existing entry in the snapshot_schedule table.
scheduleNextSnapshotJob(snapshotSchedule);
break;
case AsyncJobResult.STATUS_FAILED:
// Check the snapshot status.
Long snapshotId = snapshotSchedule.getSnapshotId();
if (snapshotId == null) {
// createSnapshotAsync exited, successfully or unsuccessfully,
// even before creating a snapshot record
// No cleanup needs to be done.
// Schedule the next snapshot.
scheduleNextSnapshotJob(snapshotSchedule);
} else {
SnapshotVO snapshot = _snapshotDao.findById(snapshotId);
if (snapshot == null || snapshot.getRemoved() != null) {
// This snapshot has been deleted successfully from the primary storage
// Again no cleanup needs to be done.
// Schedule the next snapshot.
// There's very little probability that the code reaches this point.
// The snapshotId is a foreign key for the snapshot_schedule table
// set to ON DELETE CASCADE. So if the snapshot entry is deleted, the
// snapshot_schedule entry will be too.
// But what if it has only been marked as removed?
scheduleNextSnapshotJob(snapshotSchedule);
} else {
// The management server executing this snapshot job appears to have crashed
// while creating the snapshot on primary storage/or backing it up.
// We have no idea whether the snapshot was successfully taken on the primary or not.
// Schedule the next snapshot job.
// The ValidatePreviousSnapshotCommand will take appropriate action on this snapshot
// If the snapshot was taken successfully on primary, it will retry backing it up.
// and cleanup the previous snapshot
// Set the userId to that of system.
// _snapshotManager.validateSnapshot(1L, snapshot);
// In all cases, schedule the next snapshot job
scheduleNextSnapshotJob(snapshotSchedule);
}
}
break;
case AsyncJobResult.STATUS_IN_PROGRESS:
// There is no way of knowing from here whether
// 1) Another management server is processing this snapshot job
// 2) The management server has crashed and this snapshot is lying
// around in an inconsistent state.
// Hopefully, this can be resolved at the backend when the current snapshot gets executed.
// But if it remains in this state, the current snapshot will not get executed.
// And it will remain in stasis.
break;
}
}
}