public IEnumerable <BandMailboxRebalanceData> ReduceBatchSize(IEnumerable <BandMailboxRebalanceData> results)
{
this.logger.Log(MigrationEventType.Information, "Reducing rebalance weights by a factor of {0}.", new object[]
{
this.factor
});
foreach (BandMailboxRebalanceData result in results)
{
BandMailboxRebalanceData reducedResult = new BandMailboxRebalanceData(result.SourceDatabase, result.TargetDatabase, new LoadMetricStorage())
{
RebalanceBatchName = result.RebalanceBatchName,
ConstraintSetIdentity = result.ConstraintSetIdentity
};
foreach (LoadMetric metric in result.RebalanceInformation.Metrics)
{
reducedResult.RebalanceInformation[metric] = (long)((double)result.RebalanceInformation[metric] * this.factor);
}
yield return(reducedResult);
}
yield break;
}
protected ByteQuantifiedSize GetRebalanceDatumSize(BandMailboxRebalanceData datum)
{
return((from metric in datum.RebalanceInformation.Metrics
where metric.IsSize
select metric).Aggregate(ByteQuantifiedSize.Zero, (ByteQuantifiedSize current, LoadMetric metric) => current + datum.RebalanceInformation.GetSizeMetric(metric)));
}
private void BalanceBand(Band band, double totalDatabaseWeight, BandData[] bandData)
{
this.logger.Log(MigrationEventType.Information, "Balancing band '{0}' with '{1}' data entries.", new object[]
{
band,
bandData.Count <BandData>()
});
double moveUnitsPerWeight = (double)bandData.Sum((BandData data) => data.TotalWeight) / totalDatabaseWeight;
double num = (band.Profile == Band.BandProfile.SizeBased) ? band.MailboxSizeWeightFactor : 0.0;
double deviation = (double)this.settings.WeightDeviationPercent / 100.0;
ByteQuantifiedSize byteQuantifiedSize = ByteQuantifiedSize.FromGB((ulong)this.settings.MaximumAmountOfDataPerRoundGb);
this.logger.Log(MigrationEventType.Verbose, "Moving with a deviation of '{0}', a minimum delta of '{1}' and a maximum of '{2}' per database.", new object[]
{
deviation,
num,
byteQuantifiedSize
});
List <BandData> list = (from data in bandData
orderby this.GetBandDelta(moveUnitsPerWeight, deviation, data) descending
select data).ToList <BandData>();
foreach (BandData bandData2 in list)
{
double num2 = this.GetBandDelta(moveUnitsPerWeight, deviation, bandData2);
this.logger.Log(MigrationEventType.Verbose, "Attempting to balance band {0} for database {1}, current delta is {2}.", new object[]
{
band,
bandData2.Database,
num2
});
LoadMetric instance = PhysicalSize.Instance;
if (num2 <= num)
{
this.logger.Log(MigrationEventType.Information, "Not balancing band {0} for database {1} because delta {2} is either less than the minimum of {3} or database has no more available space ({4}). We're done.", new object[]
{
band,
bandData2.Database,
num2,
num,
bandData2.Database.AvailableCapacity.GetSizeMetric(instance)
});
break;
}
foreach (BandData bandData3 in from data in bandData
orderby data.TotalWeight
select data)
{
if (!bandData3.Database.CanAcceptBalancingLoad)
{
this.logger.Log(MigrationEventType.Verbose, "Database {0} can not be used as target because it can't take LB load.", new object[]
{
bandData3.Database
});
}
else
{
double num3 = this.GetBandDelta(moveUnitsPerWeight, 0.0 - deviation, bandData3);
this.logger.Log(MigrationEventType.Verbose, "Trying to place weight into {0} (current delta: {1}).", new object[]
{
bandData3.Database,
num3
});
ByteQuantifiedSize sizeMetric = bandData3.Database.AvailableCapacity.GetSizeMetric(instance);
if (0.0 - num3 > sizeMetric.ToMB())
{
this.logger.Log(MigrationEventType.Verbose, "Target delta of {0} is larger than the {1} available space in the database, adjusting.", new object[]
{
num3,
sizeMetric
});
num3 = 0.0 - sizeMetric.ToMB();
this.logger.Log(MigrationEventType.Verbose, "New target delta is {0}.", new object[]
{
num3
});
}
if (num3 >= 0.0)
{
this.logger.Log(MigrationEventType.Verbose, "Target database is above the threshold, skipping as a target.", new object[0]);
}
else
{
ByteQuantifiedSize sizeMetric2 = bandData3.Database.CommittedLoad.GetSizeMetric(instance);
ByteQuantifiedSize byteQuantifiedSize2;
if (sizeMetric2 > byteQuantifiedSize)
{
byteQuantifiedSize2 = ByteQuantifiedSize.Zero;
}
else
{
byteQuantifiedSize2 = byteQuantifiedSize - sizeMetric2;
}
int num4 = (int)Math.Floor(byteQuantifiedSize2.ToMB() / band.MailboxSizeWeightFactor);
if (num4 <= 0)
{
this.logger.Log(MigrationEventType.Verbose, "Target database committed load is {0} which is over the limit of {1}, skipping as a target.", new object[]
{
sizeMetric2,
byteQuantifiedSize
});
}
else
{
int num5 = (int)Math.Min(Math.Round(Math.Min(Math.Abs(num2), Math.Abs(num3))), (double)num4);
this.logger.Log(MigrationEventType.Verbose, "Projected to move {0} units out of {1} and into {2}", new object[]
{
num5,
bandData2.Database,
bandData3.Database
});
if (num5 > 0)
{
ByteQuantifiedSize value = ByteQuantifiedSize.FromMB((ulong)((double)num5 * band.MailboxSizeWeightFactor));
LoadMetricStorage loadMetricStorage = new LoadMetricStorage();
loadMetricStorage[band] = (long)num5;
BandMailboxRebalanceData item = new BandMailboxRebalanceData(bandData2.Database, bandData3.Database, loadMetricStorage);
bandData3.TotalWeight += num5;
LoadMetricStorage committedLoad;
LoadMetric metric;
(committedLoad = bandData3.Database.CommittedLoad)[metric = instance] = committedLoad[metric] + (long)value.ToBytes();
this.totalDataSelectedToMove += value;
bandData2.TotalWeight -= num5;
this.results.Add(item);
num2 -= (double)num5;
}
if (num2 <= num)
{
break;
}
}
}
}
}
}
}