public override async Task UpdateProvisionAsync(
IAutoscalingConfigurationSet configuration,
DynamoDbThroughput updated,
CancellationToken cancellationToken = default(CancellationToken))
{
cancellationToken.ThrowIfCancellationRequested();
await ThroughputClient.SetGlobalSecondaryIndexThroughputLevelAsync(
tableName, indexName, updated.ReadThroughput, updated.WriteThroughput, cancellationToken)
.ConfigureAwait(false);
}
public async Task ProvisionAsync(
IAutoscalingConfigurationSet configuration,
DynamoDbThroughput current,
DynamoDbThroughput updated,
CancellationToken cancellationToken = default(CancellationToken))
{
cancellationToken.ThrowIfCancellationRequested();
var demoMode = configuration.DemoMode.GetValueOrDefault(true);
var increaseInterval = TimeSpan.FromMinutes(configuration.IncreaseInterval.GetValueOrDefault(DefaultIncreaseInterval));
var decreaseInterval = TimeSpan.FromMinutes(configuration.DecreaseInterval.GetValueOrDefault(DefaultDecreaseInterval));
var readsEnabled = configuration.Reads.EnableAutoscaling.GetValueOrDefault(true);
var writesEnabled = configuration.Writes.EnableAutoscaling.GetValueOrDefault(true);
var shouldUpdateReads = ShouldUpdate(configuration.EntityName, "reads", current.ReadThroughput,
updated.ReadThroughput, readsEnabled, demoMode, current.LastDecreaseAt, current.LastIncreaseAt, increaseInterval, decreaseInterval);
if (!shouldUpdateReads)
updated.ReadThroughput = current.ReadThroughput;
var shouldUpdateWrites = ShouldUpdate(configuration.EntityName, "writes", current.WriteThroughput,
updated.WriteThroughput, writesEnabled, demoMode, current.LastDecreaseAt, current.LastIncreaseAt, increaseInterval, decreaseInterval);
if (!shouldUpdateWrites)
updated.WriteThroughput = current.WriteThroughput;
if (shouldUpdateReads || shouldUpdateWrites)
{
try
{
await UpdateProvisionAsync(configuration, updated, cancellationToken);
StructuredLogger.Warning(
"{EntityName}: updating reads {CurrentReadThroughput}->{UpdatedReadThroughput}, writes {CurrentWriteThroughput}->{UpdatedWriteThroughput}",
configuration.EntityName, current.ReadThroughput, updated.ReadThroughput, current.WriteThroughput, updated.WriteThroughput);
}
catch (ResourceInUseException)
{
StructuredLogger.Information("{EntityName}: still updating provision", configuration.EntityName);
}
catch (LimitExceededException)
{
StructuredLogger.Information("{EntityName}: reached maximum decreases per day", configuration.EntityName);
}
}
else
{
StructuredLogger.Information(
"{EntityName}: no changes reads {CurrentReadThroughput}, writes {CurrentWriteThroughput}",
configuration.EntityName, current.ReadThroughput, current.WriteThroughput);
}
}
public abstract Task UpdateProvisionAsync(
IAutoscalingConfigurationSet configuration,
DynamoDbThroughput current,
CancellationToken cancellationToken = default(CancellationToken));
private void LogStats(AutoscalingConfigurationSet configuration, DynamoDbThroughput throughput, DynamoDbMetrics metrics)
{
var entityName = configuration.EntityName;
var readsProvisioned = throughput.ReadThroughput;
var writesProvisioned = throughput.WriteThroughput;
var readsConsumed = metrics.ConsumedReadCapacityUnits;
var writesConsumed = metrics.ConsumedWriteCapacityUnits;
var readsPercent = readsConsumed.ToPercentage(readsProvisioned);
var writesPercent = writesConsumed.ToPercentage(writesProvisioned);
structuredLogger.Information(
"{EntityName}:reads {ReadsConsumed}/{ReadsProvisioned},{ReadsPercent}%,->{ReadConsumptionDirection},{ReadThrottleEvents}",
entityName, readsConsumed, readsProvisioned, readsPercent, metrics.ReadConsumptionDirection.ToString("F4"), metrics.ReadThrottleEvents);
structuredLogger.Information(
"{EntityName}:writes {WritesConsumed}/{WritesProvisioned},{WritesPercent}%,->{WriteConsumptionDirection},{WriteThrottleEvents}",
entityName, writesConsumed, writesProvisioned, writesPercent, metrics.WriteConsumptionDirection.ToString("F4"), metrics.WriteThrottleEvents);
}