/// <summary>
/// Wait for ongoing checkpoint to complete
/// </summary>
/// <returns></returns>
public async ValueTask CompleteCheckpointAsync(CancellationToken token = default)
{
if (LightEpoch.AnyInstanceProtected())
{
throw new FasterException("Cannot use CompleteCheckpointAsync when using legacy or non-async sessions");
}
token.ThrowIfCancellationRequested();
while (true)
{
var systemState = this.systemState;
if (systemState.phase == Phase.REST || systemState.phase == Phase.PREPARE_GROW ||
systemState.phase == Phase.IN_PROGRESS_GROW)
{
return;
}
List <ValueTask> valueTasks = new List <ValueTask>();
ThreadStateMachineStep <Empty, Empty, Empty, NullFasterSession>(null, NullFasterSession.Instance, valueTasks, token);
if (valueTasks.Count == 0)
{
continue; // we need to re-check loop, so we return only when we are at REST
}
foreach (var task in valueTasks)
{
if (!task.IsCompleted)
{
await task;
}
}
}
}
/// <summary>
/// Wait for ongoing checkpoint to complete
/// </summary>
/// <returns></returns>
public async ValueTask CompleteCheckpointAsync(CancellationToken token = default)
{
if (LightEpoch.AnyInstanceProtected())
{
throw new FasterException("Cannot use CompleteCheckpointAsync when using legacy or non-async sessions");
}
token.ThrowIfCancellationRequested();
while (true)
{
var systemState = _systemState;
if (systemState.phase == Phase.REST || systemState.phase == Phase.PREPARE_GROW || systemState.phase == Phase.IN_PROGRESS_GROW)
{
return;
}
await HandleCheckpointingPhasesAsync(null, null);
}
}
/// <summary>
/// Grow the hash index by a factor of two. Make sure to take a full checkpoint
/// after growth, for persistence.
/// </summary>
/// <returns>Whether the grow completed</returns>
public bool GrowIndex()
{
if (LightEpoch.AnyInstanceProtected())
{
throw new FasterException("Cannot use GrowIndex when using legacy or non-async sessions");
}
if (!StartStateMachine(new IndexResizeStateMachine()))
{
return(false);
}
epoch.Resume();
try
{
while (true)
{
SystemState _systemState = SystemState.Copy(ref systemState);
if (_systemState.Phase == Phase.IN_PROGRESS_GROW)
{
SplitBuckets(0);
epoch.ProtectAndDrain();
}
else
{
SystemState.RemoveIntermediate(ref _systemState);
if (_systemState.Phase != Phase.PREPARE_GROW && _systemState.Phase != Phase.IN_PROGRESS_GROW)
{
return(true);
}
}
}
}
finally
{
epoch.Suspend();
}
}
/// <summary>
/// Wait for ongoing checkpoint to complete
/// </summary>
/// <returns></returns>
public async ValueTask CompleteCheckpointAsync(CancellationToken token = default)
{
if (LightEpoch.AnyInstanceProtected())
{
throw new FasterException("Cannot use CompleteCheckpointAsync when using legacy or non-async sessions");
}
token.ThrowIfCancellationRequested();
while (true)
{
var systemState = this.systemState;
if (systemState.phase == Phase.REST || systemState.phase == Phase.PREPARE_GROW ||
systemState.phase == Phase.IN_PROGRESS_GROW)
{
return;
}
// TODO: Do we need access to functions here?
// If yes then move this to either faster legacy or client session.
await ThreadStateMachineStep <Empty, Empty, Empty, NullFasterSession>(null, NullFasterSession.Instance, true, token);
}
}
