public IEnumerable<MappedResultInfo> GetItemsToReduce(GetItemsToReduceParams getItemsToReduceParams)
{
var scheduledReductionsByViewAndLevelAndReduceKey = tableStorage.ScheduledReductions.GetIndex(Tables.ScheduledReductions.Indices.ByViewAndLevelAndReduceKey);
var deleter = new ScheduledReductionDeleter(getItemsToReduceParams.ItemsToDelete, o =>
{
var etag = o as Etag;
if (etag == null)
return null;
return (Slice)etag.ToString();
});
var seenLocally = new HashSet<Tuple<string, int>>();
foreach (var reduceKey in getItemsToReduceParams.ReduceKeys.ToArray())
{
var reduceKeyHash = HashKey(reduceKey);
var viewAndLevelAndReduceKey = (Slice) CreateKey(getItemsToReduceParams.Index, getItemsToReduceParams.Level, ReduceKeySizeLimited(reduceKey), reduceKeyHash);
using (var iterator = scheduledReductionsByViewAndLevelAndReduceKey.MultiRead(Snapshot, viewAndLevelAndReduceKey))
{
if (!iterator.Seek(Slice.BeforeAllKeys))
continue;
do
{
if (getItemsToReduceParams.Take <= 0)
break;
ushort version;
var value = LoadStruct(tableStorage.ScheduledReductions, iterator.CurrentKey, writeBatch.Value, out version);
var reduceKeyFromDb = value.ReadString(ScheduledReductionFields.ReduceKey);
var bucket = value.ReadInt(ScheduledReductionFields.Bucket);
var rowKey = Tuple.Create(reduceKeyFromDb, bucket);
var thisIsNewScheduledReductionRow = deleter.Delete(iterator.CurrentKey, Etag.Parse(value.ReadBytes(ScheduledReductionFields.Etag)));
var neverSeenThisKeyAndBucket = getItemsToReduceParams.ItemsAlreadySeen.Add(rowKey);
if (thisIsNewScheduledReductionRow || neverSeenThisKeyAndBucket)
{
if (seenLocally.Add(rowKey))
{
foreach (var mappedResultInfo in GetResultsForBucket(getItemsToReduceParams.Index, getItemsToReduceParams.Level, reduceKeyFromDb, bucket, getItemsToReduceParams.LoadData))
{
getItemsToReduceParams.Take--;
yield return mappedResultInfo;
}
}
}
if (getItemsToReduceParams.Take <= 0)
yield break;
}
while (iterator.MoveNext());
}
getItemsToReduceParams.ReduceKeys.Remove(reduceKey);
if (getItemsToReduceParams.Take <= 0)
yield break;
}
}
public IList<MappedResultInfo> GetItemsToReduce(GetItemsToReduceParams getItemsToReduceParams, CancellationToken cancellationToken)
{
Api.JetSetCurrentIndex(session, ScheduledReductions, "by_view_level_and_hashed_reduce_key_and_bucket");
var viewReductionColumn = tableColumnsCache.ScheduledReductionColumns["view"];
var levelReductionColumn = tableColumnsCache.ScheduledReductionColumns["level"];
var reduceReductionColumn = tableColumnsCache.ScheduledReductionColumns["reduce_key"];
var bucketReductionColumn = tableColumnsCache.ScheduledReductionColumns["bucket"];
var keysToRemove = new List<string>();
var output = new List<MappedResultInfo>();
var seenLocally = new HashSet<ReduceKeyAndBucket>(ReduceKeyAndBucketEqualityComparer.Instance);
try
{
var first = true;
foreach (var reduceKey in getItemsToReduceParams.ReduceKeys)
{
cancellationToken.ThrowIfCancellationRequested();
int initialBucket = 0;
bool needToMoveNext = false;
if (first)
{
first = false;
if (getItemsToReduceParams.LastReduceKeyAndBucket != null)
{
if (getItemsToReduceParams.LastReduceKeyAndBucket.ReduceKey != reduceKey)
{
needToMoveNext = true;
initialBucket = getItemsToReduceParams.LastReduceKeyAndBucket.Bucket;
}
}
}
Api.MakeKey(session, ScheduledReductions, getItemsToReduceParams.Index, MakeKeyGrbit.NewKey);
Api.MakeKey(session, ScheduledReductions, getItemsToReduceParams.Level, MakeKeyGrbit.None);
Api.MakeKey(session, ScheduledReductions, HashReduceKey(reduceKey), MakeKeyGrbit.None);
Api.MakeKey(session, ScheduledReductions, initialBucket, MakeKeyGrbit.None);
if (Api.TrySeek(session, ScheduledReductions, SeekGrbit.SeekGE) == false ||
(needToMoveNext && Api.TryMoveNext(session, ScheduledReductions) == false) )
{
keysToRemove.Add(reduceKey);
continue;
}
Api.MakeKey(session, ScheduledReductions, getItemsToReduceParams.Index, MakeKeyGrbit.NewKey);
Api.MakeKey(session, ScheduledReductions, getItemsToReduceParams.Level, MakeKeyGrbit.None);
Api.MakeKey(session, ScheduledReductions, HashReduceKey(reduceKey), MakeKeyGrbit.None);
Api.MakeKey(session, ScheduledReductions, int.MaxValue, MakeKeyGrbit.None);
if (Api.TrySetIndexRange(session, ScheduledReductions, SetIndexRangeGrbit.RangeInclusive | SetIndexRangeGrbit.RangeUpperLimit) == false)
{
keysToRemove.Add(reduceKey);
continue;
}
// this isn't used for optimized reading, but to make it easier to delete records later on
OptimizedDeleter reader;
if (getItemsToReduceParams.ItemsToDelete.Count == 0)
{
getItemsToReduceParams.ItemsToDelete.Add(reader = new OptimizedDeleter());
}
else
{
reader = (OptimizedDeleter)getItemsToReduceParams.ItemsToDelete.First();
}
reader.IndexId = getItemsToReduceParams.Index;
do
{
cancellationToken.ThrowIfCancellationRequested();
if (getItemsToReduceParams.Take <= 0)
return output;
var indexFromDb = Api.RetrieveColumnAsInt32(session, ScheduledReductions, viewReductionColumn, RetrieveColumnGrbit.RetrieveFromIndex);
var levelFromDb = Api.RetrieveColumnAsInt32(session, ScheduledReductions, levelReductionColumn, RetrieveColumnGrbit.RetrieveFromIndex).Value;
var reduceKeyFromDb = Api.RetrieveColumnAsString(session, ScheduledReductions, reduceReductionColumn);
if (getItemsToReduceParams.Index != indexFromDb)
break;
if (levelFromDb != getItemsToReduceParams.Level)
break;
if (string.Equals(reduceKeyFromDb, reduceKey, StringComparison.Ordinal) == false)
break;
var bucket = Api.RetrieveColumnAsInt32(session, ScheduledReductions, bucketReductionColumn).Value;
var rowKey = new ReduceKeyAndBucket(bucket, reduceKeyFromDb);
var thisIsNewScheduledReductionRow = reader.Add(session, ScheduledReductions, getItemsToReduceParams.Level);
if (thisIsNewScheduledReductionRow)
{
if (seenLocally.Add(rowKey))
{
getItemsToReduceParams.LastReduceKeyAndBucket = rowKey;
foreach (var mappedResultInfo in GetResultsForBucket(getItemsToReduceParams.Index, getItemsToReduceParams.Level, reduceKeyFromDb, bucket, getItemsToReduceParams.LoadData, cancellationToken))
{
getItemsToReduceParams.Take--;
output.Add(mappedResultInfo);
}
}
}
}
while (Api.TryMoveNext(session, ScheduledReductions));
keysToRemove.Add(reduceKey);
if (getItemsToReduceParams.Take <= 0)
break;
}
return output;
}
finally
{
// In whatever condition we would have to return, we must signal the removal of the reduce keys.
foreach (var keyToRemove in keysToRemove)
getItemsToReduceParams.ReduceKeys.Remove(keyToRemove);
}
}
private ReducingPerformanceStats SingleStepReduce(IndexToWorkOn index, List <string> keysToReduce, AbstractViewGenerator viewGenerator,
ConcurrentSet <object> itemsToDelete, CancellationToken token)
{
var needToMoveToSingleStepQueue = new ConcurrentQueue <HashSet <string> >();
if (Log.IsDebugEnabled)
{
Log.Debug(() => string.Format("Executing single step reducing for {0} keys [{1}]", keysToReduce.Count, string.Join(", ", keysToReduce)));
}
var batchTimeWatcher = Stopwatch.StartNew();
var reducingBatchThrottlerId = Guid.NewGuid();
var reducePerformanceStats = new ReducingPerformanceStats(ReduceType.SingleStep);
var reduceLevelStats = new ReduceLevelPeformanceStats
{
Started = SystemTime.UtcNow,
Level = 2
};
try
{
var parallelOperations = new ConcurrentQueue <ParallelBatchStats>();
var parallelProcessingStart = SystemTime.UtcNow;
BackgroundTaskExecuter.Instance.ExecuteAllBuffered(context, keysToReduce, enumerator =>
{
var parallelStats = new ParallelBatchStats
{
StartDelay = (long)(SystemTime.UtcNow - parallelProcessingStart).TotalMilliseconds
};
var localNeedToMoveToSingleStep = new HashSet <string>();
needToMoveToSingleStepQueue.Enqueue(localNeedToMoveToSingleStep);
var localKeys = new HashSet <string>();
while (enumerator.MoveNext())
{
token.ThrowIfCancellationRequested();
localKeys.Add(enumerator.Current);
}
transactionalStorage.Batch(actions =>
{
var getItemsToReduceParams = new GetItemsToReduceParams(index: index.IndexId, reduceKeys: new HashSet <string>(localKeys), level: 0, loadData: false, itemsToDelete: itemsToDelete)
{
Take = int.MaxValue // just get all, we do the rate limit when we load the number of keys to reduce, anyway
};
var getItemsToReduceDuration = Stopwatch.StartNew();
int scheduledItemsSum = 0;
int scheduledItemsCount = 0;
List <int> scheduledItemsMappedBuckets = new List <int>();
using (StopwatchScope.For(getItemsToReduceDuration))
{
foreach (var item in actions.MapReduce.GetItemsToReduce(getItemsToReduceParams, token))
{
scheduledItemsMappedBuckets.Add(item.Bucket);
scheduledItemsSum += item.Size;
scheduledItemsCount++;
}
}
parallelStats.Operations.Add(PerformanceStats.From(IndexingOperation.Reduce_GetItemsToReduce, getItemsToReduceDuration.ElapsedMilliseconds));
autoTuner.CurrentlyUsedBatchSizesInBytes.GetOrAdd(reducingBatchThrottlerId, scheduledItemsSum);
if (scheduledItemsCount == 0)
{
// Here we have an interesting issue. We have scheduled reductions, because GetReduceTypesPerKeys() returned them
// and at the same time, we don't have any at level 0. That probably means that we have them at level 1 or 2.
// They shouldn't be here, and indeed, we remove them just a little down from here in this function.
// That said, they might have smuggled in between versions, or something happened to cause them to be here.
// In order to avoid that, we forcibly delete those extra items from the scheduled reductions, and move on
Log.Warn("Found single reduce items ({0}) that didn't have any items to reduce. Deleting level 1 & level 2 items for those keys. (If you can reproduce this, please contact [email protected])", string.Join(", ", keysToReduce));
var deletingScheduledReductionsDuration = Stopwatch.StartNew();
using (StopwatchScope.For(deletingScheduledReductionsDuration))
{
foreach (var reduceKey in keysToReduce)
{
token.ThrowIfCancellationRequested();
actions.MapReduce.DeleteScheduledReduction(index.IndexId, 1, reduceKey);
actions.MapReduce.DeleteScheduledReduction(index.IndexId, 2, reduceKey);
}
}
parallelStats.Operations.Add(PerformanceStats.From(IndexingOperation.Reduce_DeleteScheduledReductions, deletingScheduledReductionsDuration.ElapsedMilliseconds));
}
var removeReduceResultsDuration = new Stopwatch();
foreach (var reduceKey in localKeys)
{
token.ThrowIfCancellationRequested();
var lastPerformedReduceType = actions.MapReduce.GetLastPerformedReduceType(index.IndexId, reduceKey);
if (lastPerformedReduceType != ReduceType.SingleStep)
{
localNeedToMoveToSingleStep.Add(reduceKey);
}
if (lastPerformedReduceType != ReduceType.MultiStep)
{
continue;
}
if (Log.IsDebugEnabled)
{
Log.Debug("Key {0} was moved from multi step to single step reduce, removing existing reduce results records", reduceKey);
}
using (StopwatchScope.For(removeReduceResultsDuration))
{
// now we are in single step but previously multi step reduce was performed for the given key
var mappedBuckets = actions.MapReduce.GetMappedBuckets(index.IndexId, reduceKey, token);
// add scheduled items too to be sure we will delete reduce results of already deleted documents
foreach (var mappedBucket in mappedBuckets.Union(scheduledItemsMappedBuckets))
{
actions.MapReduce.RemoveReduceResults(index.IndexId, 1, reduceKey, mappedBucket);
actions.MapReduce.RemoveReduceResults(index.IndexId, 2, reduceKey, mappedBucket / 1024);
}
}
}
parallelStats.Operations.Add(PerformanceStats.From(IndexingOperation.Reduce_RemoveReduceResults, removeReduceResultsDuration.ElapsedMilliseconds));
parallelOperations.Enqueue(parallelStats);
});
});
reduceLevelStats.Operations.Add(new ParallelPerformanceStats
{
NumberOfThreads = parallelOperations.Count,
DurationMs = (long)(SystemTime.UtcNow - parallelProcessingStart).TotalMilliseconds,
BatchedOperations = parallelOperations.ToList()
});
var getMappedResultsDuration = new Stopwatch();
var reductionPerformanceStats = new List <IndexingPerformanceStats>();
var keysLeftToReduce = new HashSet <string>(keysToReduce);
while (keysLeftToReduce.Count > 0)
{
var keysReturned = new HashSet <string>();
// Try to diminish the allocations happening because of .Resize()
var mappedResults = new List <MappedResultInfo>(keysLeftToReduce.Count);
context.TransactionalStorage.Batch(actions =>
{
var take = context.CurrentNumberOfItemsToReduceInSingleBatch;
using (StopwatchScope.For(getMappedResultsDuration))
{
mappedResults = actions.MapReduce.GetMappedResults(index.IndexId, keysLeftToReduce, true, take, keysReturned, token, mappedResults);
}
});
var count = mappedResults.Count;
int size = 0;
foreach (var item in mappedResults)
{
item.Bucket = 0;
size += item.Size;
}
var results = mappedResults.GroupBy(x => x.Bucket, x => JsonToExpando.Convert(x.Data)).ToArray();
context.MetricsCounters.ReducedPerSecond.Mark(results.Length);
token.ThrowIfCancellationRequested();
var performance = context.IndexStorage.Reduce(index.IndexId, viewGenerator, results, 2, context, null, keysReturned, count);
reductionPerformanceStats.Add(performance);
autoTuner.AutoThrottleBatchSize(count, size, batchTimeWatcher.Elapsed);
}
var needToMoveToSingleStep = new HashSet <string>();
HashSet <string> set;
while (needToMoveToSingleStepQueue.TryDequeue(out set))
{
needToMoveToSingleStep.UnionWith(set);
}
foreach (var reduceKey in needToMoveToSingleStep)
{
string localReduceKey = reduceKey;
transactionalStorage.Batch(actions =>
actions.MapReduce.UpdatePerformedReduceType(index.IndexId, localReduceKey, ReduceType.SingleStep));
}
reduceLevelStats.Completed = SystemTime.UtcNow;
reduceLevelStats.Duration = reduceLevelStats.Completed - reduceLevelStats.Started;
reduceLevelStats.Operations.Add(PerformanceStats.From(IndexingOperation.Reduce_GetMappedResults, getMappedResultsDuration.ElapsedMilliseconds));
reduceLevelStats.Operations.Add(PerformanceStats.From(IndexingOperation.StorageCommit, 0)); // in single step we write directly to Lucene index
foreach (var stats in reductionPerformanceStats)
{
reduceLevelStats.Add(stats);
}
reducePerformanceStats.LevelStats.Add(reduceLevelStats);
}
finally
{
long _;
autoTuner.CurrentlyUsedBatchSizesInBytes.TryRemove(reducingBatchThrottlerId, out _);
}
return(reducePerformanceStats);
}
public IEnumerable<MappedResultInfo> GetItemsToReduce(GetItemsToReduceParams getItemsToReduceParams, CancellationToken cancellationToken)
{
Api.JetSetCurrentIndex(session, ScheduledReductions, "by_view_level_and_hashed_reduce_key_and_bucket");
var seenLocally = new HashSet<Tuple<string, int>>();
foreach (var reduceKey in getItemsToReduceParams.ReduceKeys.ToArray())
{
cancellationToken.ThrowIfCancellationRequested();
Api.MakeKey(session, ScheduledReductions, getItemsToReduceParams.Index, MakeKeyGrbit.NewKey);
Api.MakeKey(session, ScheduledReductions, getItemsToReduceParams.Level, MakeKeyGrbit.None);
Api.MakeKey(session, ScheduledReductions, HashReduceKey(reduceKey), MakeKeyGrbit.None);
Api.MakeKey(session, ScheduledReductions, 0, MakeKeyGrbit.None);
if (Api.TrySeek(session, ScheduledReductions, SeekGrbit.SeekGE) == false)
continue;
Api.MakeKey(session, ScheduledReductions, getItemsToReduceParams.Index, MakeKeyGrbit.NewKey);
Api.MakeKey(session, ScheduledReductions, getItemsToReduceParams.Level, MakeKeyGrbit.None);
Api.MakeKey(session, ScheduledReductions, HashReduceKey(reduceKey), MakeKeyGrbit.None);
Api.MakeKey(session, ScheduledReductions, int.MaxValue, MakeKeyGrbit.None);
if(Api.TrySetIndexRange(session, ScheduledReductions, SetIndexRangeGrbit.RangeInclusive | SetIndexRangeGrbit.RangeUpperLimit) == false)
continue;
// this isn't used for optimized reading, but to make it easier to delete records later on
OptimizedDeleter reader;
if (getItemsToReduceParams.ItemsToDelete.Count == 0)
{
getItemsToReduceParams.ItemsToDelete.Add(reader = new OptimizedDeleter());
}
else
{
reader = (OptimizedDeleter)getItemsToReduceParams.ItemsToDelete.First();
}
do
{
cancellationToken.ThrowIfCancellationRequested();
if (getItemsToReduceParams.Take <= 0)
break;
var indexFromDb = Api.RetrieveColumnAsInt32(session, ScheduledReductions, tableColumnsCache.ScheduledReductionColumns["view"], RetrieveColumnGrbit.RetrieveFromIndex);
var levelFromDb =
Api.RetrieveColumnAsInt32(session, ScheduledReductions, tableColumnsCache.ScheduledReductionColumns["level"], RetrieveColumnGrbit.RetrieveFromIndex).
Value;
var reduceKeyFromDb = Api.RetrieveColumnAsString(session, ScheduledReductions,
tableColumnsCache.ScheduledReductionColumns["reduce_key"]);
if (getItemsToReduceParams.Index != indexFromDb)
continue;
if (levelFromDb != getItemsToReduceParams.Level)
continue;
if (string.Equals(reduceKeyFromDb, reduceKey, StringComparison.Ordinal) == false)
continue;
var bucket =
Api.RetrieveColumnAsInt32(session, ScheduledReductions, tableColumnsCache.ScheduledReductionColumns["bucket"]).Value;
var rowKey = Tuple.Create(reduceKeyFromDb, bucket);
var thisIsNewScheduledReductionRow = reader.Add(session, ScheduledReductions);
var neverSeenThisKeyAndBucket = getItemsToReduceParams.ItemsAlreadySeen.Add(rowKey);
if (thisIsNewScheduledReductionRow || neverSeenThisKeyAndBucket)
{
if (seenLocally.Add(rowKey))
{
foreach (var mappedResultInfo in GetResultsForBucket(getItemsToReduceParams.Index, getItemsToReduceParams.Level, reduceKeyFromDb, bucket, getItemsToReduceParams.LoadData, cancellationToken))
{
getItemsToReduceParams.Take--;
yield return mappedResultInfo;
}
}
}
if (getItemsToReduceParams.Take <= 0)
yield break;
} while (Api.TryMoveNext(session, ScheduledReductions));
getItemsToReduceParams.ReduceKeys.Remove(reduceKey);
if (getItemsToReduceParams.Take <= 0)
break;
}
}
private void MultiStepReduce(IndexToWorkOn index, string[] keysToReduce, AbstractViewGenerator viewGenerator, ConcurrentSet <object> itemsToDelete)
{
var needToMoveToMultiStep = new HashSet <string>();
transactionalStorage.Batch(actions =>
{
foreach (var localReduceKey in keysToReduce)
{
var lastPerformedReduceType = actions.MapReduce.GetLastPerformedReduceType(index.IndexName, localReduceKey);
if (lastPerformedReduceType != ReduceType.MultiStep)
{
needToMoveToMultiStep.Add(localReduceKey);
}
if (lastPerformedReduceType != ReduceType.SingleStep)
{
continue;
}
// we exceeded the limit of items to reduce in single step
// now we need to schedule reductions at level 0 for all map results with given reduce key
var mappedItems = actions.MapReduce.GetMappedBuckets(index.IndexName, localReduceKey).ToList();
foreach (var result in mappedItems.Select(x => new ReduceKeyAndBucket(x, localReduceKey)))
{
actions.MapReduce.ScheduleReductions(index.IndexName, 0, result);
}
}
});
for (int i = 0; i < 3; i++)
{
var level = i;
var reduceParams = new GetItemsToReduceParams(
index.IndexName,
keysToReduce,
level,
true,
itemsToDelete);
bool retry = true;
while (retry && reduceParams.ReduceKeys.Count > 0)
{
var reduceBatchAutoThrottlerId = Guid.NewGuid();
try
{
transactionalStorage.Batch(actions =>
{
context.CancellationToken.ThrowIfCancellationRequested();
var batchTimeWatcher = Stopwatch.StartNew();
reduceParams.Take = context.CurrentNumberOfItemsToReduceInSingleBatch;
var persistedResults = actions.MapReduce.GetItemsToReduce(reduceParams).ToList();
if (persistedResults.Count == 0)
{
retry = false;
return;
}
var count = persistedResults.Count;
var size = persistedResults.Sum(x => x.Size);
autoTuner.CurrentlyUsedBatchSizes.GetOrAdd(reduceBatchAutoThrottlerId, size);
if (Log.IsDebugEnabled)
{
if (persistedResults.Count > 0)
{
Log.Debug(() => string.Format("Found {0} results for keys [{1}] for index {2} at level {3} in {4}",
persistedResults.Count,
string.Join(", ", persistedResults.Select(x => x.ReduceKey).Distinct()),
index.IndexName, level, batchTimeWatcher.Elapsed));
}
else
{
Log.Debug("No reduce keys found for {0}", index.IndexName);
}
}
context.CancellationToken.ThrowIfCancellationRequested();
var requiredReduceNextTime = persistedResults.Select(x => new ReduceKeyAndBucket(x.Bucket, x.ReduceKey))
.OrderBy(x => x.Bucket)
.Distinct()
.ToArray();
foreach (var mappedResultInfo in requiredReduceNextTime)
{
actions.MapReduce.RemoveReduceResults(index.IndexName, level + 1, mappedResultInfo.ReduceKey,
mappedResultInfo.Bucket);
}
if (level != 2)
{
var reduceKeysAndBuckets = requiredReduceNextTime
.Select(x => new ReduceKeyAndBucket(x.Bucket / 1024, x.ReduceKey))
.Distinct()
.ToArray();
foreach (var reduceKeysAndBucket in reduceKeysAndBuckets)
{
actions.MapReduce.ScheduleReductions(index.IndexName, level + 1, reduceKeysAndBucket);
}
}
var results = persistedResults
.Where(x => x.Data != null)
.GroupBy(x => x.Bucket, x => JsonToExpando.Convert(x.Data))
.ToArray();
var reduceKeys = new HashSet <string>(persistedResults.Select(x => x.ReduceKey),
StringComparer.InvariantCultureIgnoreCase);
context.PerformanceCounters.ReducedPerSecond.IncrementBy(results.Length);
context.CancellationToken.ThrowIfCancellationRequested();
var reduceTimeWatcher = Stopwatch.StartNew();
context.IndexStorage.Reduce(index.IndexName, viewGenerator, results, level, context, actions, reduceKeys, persistedResults.Count);
var batchDuration = batchTimeWatcher.Elapsed;
Log.Debug("Indexed {0} reduce keys in {1} with {2} results for index {3} in {4} on level {5}", reduceKeys.Count, batchDuration,
results.Length, index.IndexName, reduceTimeWatcher.Elapsed, level);
autoTuner.AutoThrottleBatchSize(count, size, batchDuration);
});
}
finally
{
long _;
autoTuner.CurrentlyUsedBatchSizes.TryRemove(reduceBatchAutoThrottlerId, out _);
}
}
}
foreach (var reduceKey in needToMoveToMultiStep)
{
string localReduceKey = reduceKey;
transactionalStorage.Batch(actions =>
actions.MapReduce.UpdatePerformedReduceType(index.IndexName, localReduceKey,
ReduceType.MultiStep));
}
}
private ReducingPerformanceStats MultiStepReduce(IndexToWorkOn index, List <string> keysToReduce, AbstractViewGenerator viewGenerator, ConcurrentSet <object> itemsToDelete, CancellationToken token)
{
var needToMoveToMultiStep = new HashSet <string>();
transactionalStorage.Batch(actions =>
{
foreach (var localReduceKey in keysToReduce)
{
token.ThrowIfCancellationRequested();
var lastPerformedReduceType = actions.MapReduce.GetLastPerformedReduceType(index.IndexId, localReduceKey);
if (lastPerformedReduceType != ReduceType.MultiStep)
{
needToMoveToMultiStep.Add(localReduceKey);
}
if (lastPerformedReduceType != ReduceType.SingleStep)
{
continue;
}
// we exceeded the limit of items to reduce in single step
// now we need to schedule reductions at level 0 for all map results with given reduce key
var mappedItems = actions.MapReduce.GetMappedBuckets(index.IndexId, localReduceKey, token).ToList();
foreach (var result in mappedItems.Select(x => new ReduceKeyAndBucket(x, localReduceKey)))
{
actions.MapReduce.ScheduleReductions(index.IndexId, 0, result);
}
}
});
var reducePerformance = new ReducingPerformanceStats(ReduceType.MultiStep);
for (int i = 0; i < 3; i++)
{
var level = i;
var reduceLevelStats = new ReduceLevelPeformanceStats()
{
Level = level,
Started = SystemTime.UtcNow,
};
var reduceParams = new GetItemsToReduceParams(
index.IndexId,
new HashSet <string>(keysToReduce),
level,
true,
itemsToDelete);
var gettingItemsToReduceDuration = new Stopwatch();
var scheduleReductionsDuration = new Stopwatch();
var removeReduceResultsDuration = new Stopwatch();
var storageCommitDuration = new Stopwatch();
bool retry = true;
while (retry && reduceParams.ReduceKeys.Count > 0)
{
var reduceBatchAutoThrottlerId = Guid.NewGuid();
try
{
transactionalStorage.Batch(actions =>
{
token.ThrowIfCancellationRequested();
actions.BeforeStorageCommit += storageCommitDuration.Start;
actions.AfterStorageCommit += storageCommitDuration.Stop;
var batchTimeWatcher = Stopwatch.StartNew();
reduceParams.Take = context.CurrentNumberOfItemsToReduceInSingleBatch;
int size = 0;
IList <MappedResultInfo> persistedResults;
var reduceKeys = new HashSet <string>(StringComparer.InvariantCultureIgnoreCase);
using (StopwatchScope.For(gettingItemsToReduceDuration))
{
persistedResults = actions.MapReduce.GetItemsToReduce(reduceParams, token);
foreach (var item in persistedResults)
{
reduceKeys.Add(item.ReduceKey);
size += item.Size;
}
}
if (persistedResults.Count == 0)
{
retry = false;
return;
}
var count = persistedResults.Count;
autoTuner.CurrentlyUsedBatchSizesInBytes.GetOrAdd(reduceBatchAutoThrottlerId, size);
if (Log.IsDebugEnabled)
{
if (persistedResults.Count > 0)
{
Log.Debug(() => string.Format("Found {0} results for keys [{1}] for index {2} at level {3} in {4}",
persistedResults.Count,
string.Join(", ", persistedResults.Select(x => x.ReduceKey).Distinct()),
index.Index.PublicName, level, batchTimeWatcher.Elapsed));
}
else
{
Log.Debug("No reduce keys found for {0}", index.Index.PublicName);
}
}
token.ThrowIfCancellationRequested();
var requiredReduceNextTimeSet = new HashSet <ReduceKeyAndBucket>(persistedResults.Select(x => new ReduceKeyAndBucket(x.Bucket, x.ReduceKey)), ReduceKeyAndBucketEqualityComparer.Instance);
using (StopwatchScope.For(removeReduceResultsDuration))
{
foreach (var mappedResultInfo in requiredReduceNextTimeSet)
{
token.ThrowIfCancellationRequested();
actions.MapReduce.RemoveReduceResults(index.IndexId, level + 1, mappedResultInfo.ReduceKey, mappedResultInfo.Bucket);
}
}
if (level != 2)
{
var reduceKeysAndBucketsSet = new HashSet <ReduceKeyAndBucket>(requiredReduceNextTimeSet.Select(x => new ReduceKeyAndBucket(x.Bucket / 1024, x.ReduceKey)), ReduceKeyAndBucketEqualityComparer.Instance);
using (StopwatchScope.For(scheduleReductionsDuration))
{
foreach (var reduceKeysAndBucket in reduceKeysAndBucketsSet)
{
token.ThrowIfCancellationRequested();
actions.MapReduce.ScheduleReductions(index.IndexId, level + 1, reduceKeysAndBucket);
}
}
}
token.ThrowIfCancellationRequested();
var reduceTimeWatcher = Stopwatch.StartNew();
var results = persistedResults.Where(x => x.Data != null)
.GroupBy(x => x.Bucket, x => JsonToExpando.Convert(x.Data))
.ToList();
var performance = context.IndexStorage.Reduce(index.IndexId, viewGenerator, results, level, context, actions, reduceKeys, persistedResults.Count);
context.MetricsCounters.ReducedPerSecond.Mark(results.Count());
reduceLevelStats.Add(performance);
var batchDuration = batchTimeWatcher.Elapsed;
if (Log.IsDebugEnabled)
{
Log.Debug("Indexed {0} reduce keys in {1} with {2} results for index {3} in {4} on level {5}", reduceKeys.Count, batchDuration, performance.ItemsCount, index.Index.PublicName, reduceTimeWatcher.Elapsed, level);
}
autoTuner.AutoThrottleBatchSize(count, size, batchDuration);
});
}
finally
{
long _;
autoTuner.CurrentlyUsedBatchSizesInBytes.TryRemove(reduceBatchAutoThrottlerId, out _);
}
}
reduceLevelStats.Completed = SystemTime.UtcNow;
reduceLevelStats.Duration = reduceLevelStats.Completed - reduceLevelStats.Started;
reduceLevelStats.Operations.Add(PerformanceStats.From(IndexingOperation.Reduce_GetItemsToReduce, gettingItemsToReduceDuration.ElapsedMilliseconds));
reduceLevelStats.Operations.Add(PerformanceStats.From(IndexingOperation.Reduce_ScheduleReductions, scheduleReductionsDuration.ElapsedMilliseconds));
reduceLevelStats.Operations.Add(PerformanceStats.From(IndexingOperation.Reduce_RemoveReduceResults, removeReduceResultsDuration.ElapsedMilliseconds));
reduceLevelStats.Operations.Add(PerformanceStats.From(IndexingOperation.StorageCommit, storageCommitDuration.ElapsedMilliseconds));
reducePerformance.LevelStats.Add(reduceLevelStats);
}
foreach (var reduceKey in needToMoveToMultiStep)
{
token.ThrowIfCancellationRequested();
string localReduceKey = reduceKey;
transactionalStorage.Batch(actions =>
actions.MapReduce.UpdatePerformedReduceType(index.IndexId, localReduceKey,
ReduceType.MultiStep));
}
return(reducePerformance);
}
private void SingleStepReduce(IndexToWorkOn index, string[] keysToReduce, AbstractViewGenerator viewGenerator,
ConcurrentSet <object> itemsToDelete)
{
var needToMoveToSingleStepQueue = new ConcurrentQueue <HashSet <string> >();
Log.Debug(() => string.Format("Executing single step reducing for {0} keys [{1}]", keysToReduce.Length, string.Join(", ", keysToReduce)));
var batchTimeWatcher = Stopwatch.StartNew();
var count = 0;
var size = 0;
var state = new ConcurrentQueue <Tuple <HashSet <string>, List <MappedResultInfo> > >();
var reducingBatchThrottlerId = Guid.NewGuid();
try
{
BackgroundTaskExecuter.Instance.ExecuteAllBuffered(context, keysToReduce, enumerator =>
{
var localNeedToMoveToSingleStep = new HashSet <string>();
needToMoveToSingleStepQueue.Enqueue(localNeedToMoveToSingleStep);
var localKeys = new HashSet <string>();
while (enumerator.MoveNext())
{
localKeys.Add(enumerator.Current);
}
transactionalStorage.Batch(actions =>
{
var getItemsToReduceParams = new GetItemsToReduceParams(index: index.IndexName, reduceKeys: localKeys, level: 0,
loadData: false,
itemsToDelete: itemsToDelete)
{
Take = int.MaxValue // just get all, we do the rate limit when we load the number of keys to reduce, anyway
};
var scheduledItems = actions.MapReduce.GetItemsToReduce(getItemsToReduceParams).ToList();
autoTuner.CurrentlyUsedBatchSizes.GetOrAdd(reducingBatchThrottlerId, scheduledItems.Sum(x => x.Size));
if (scheduledItems.Count == 0)
{
if (Log.IsWarnEnabled)
{
Log.Warn("Found single reduce items ({0}) that didn't have any items to reduce. Deleting level 1 & level 2 items for those keys. (If you can reproduce this, please contact [email protected])",
string.Join(", ", keysToReduce));
}
// Here we have an interesting issue. We have scheduled reductions, because GetReduceTypesPerKeys() returned them
// and at the same time, we don't have any at level 0. That probably means that we have them at level 1 or 2.
// They shouldn't be here, and indeed, we remove them just a little down from here in this function.
// That said, they might bave smuggled in between versions, or something happened to cause them to be here.
// In order to avoid that, we forcibly delete those extra items from the scheduled reductions, and move on
foreach (var reduceKey in keysToReduce)
{
actions.MapReduce.DeleteScheduledReduction(index.IndexName, 1, reduceKey);
actions.MapReduce.DeleteScheduledReduction(index.IndexName, 2, reduceKey);
}
}
foreach (var reduceKey in localKeys)
{
var lastPerformedReduceType = actions.MapReduce.GetLastPerformedReduceType(index.IndexName, reduceKey);
if (lastPerformedReduceType != ReduceType.SingleStep)
{
localNeedToMoveToSingleStep.Add(reduceKey);
}
if (lastPerformedReduceType != ReduceType.MultiStep)
{
continue;
}
Log.Debug("Key {0} was moved from multi step to single step reduce, removing existing reduce results records",
reduceKey);
// now we are in single step but previously multi step reduce was performed for the given key
var mappedBuckets = actions.MapReduce.GetMappedBuckets(index.IndexName, reduceKey).ToList();
// add scheduled items too to be sure we will delete reduce results of already deleted documents
mappedBuckets.AddRange(scheduledItems.Select(x => x.Bucket));
foreach (var mappedBucket in mappedBuckets.Distinct())
{
actions.MapReduce.RemoveReduceResults(index.IndexName, 1, reduceKey, mappedBucket);
actions.MapReduce.RemoveReduceResults(index.IndexName, 2, reduceKey, mappedBucket / 1024);
}
}
var mappedResults = actions.MapReduce.GetMappedResults(
index.IndexName,
localKeys,
loadData: true
).ToList();
Interlocked.Add(ref count, mappedResults.Count);
Interlocked.Add(ref size, mappedResults.Sum(x => x.Size));
mappedResults.ApplyIfNotNull(x => x.Bucket = 0);
state.Enqueue(Tuple.Create(localKeys, mappedResults));
});
});
var reduceKeys = new HashSet <string>(state.SelectMany(x => x.Item1));
var results = state.SelectMany(x => x.Item2)
.Where(x => x.Data != null)
.GroupBy(x => x.Bucket, x => JsonToExpando.Convert(x.Data))
.ToArray();
context.PerformanceCounters.ReducedPerSecond.IncrementBy(results.Length);
context.TransactionalStorage.Batch(actions =>
context.IndexStorage.Reduce(index.IndexName, viewGenerator, results, 2, context, actions, reduceKeys, state.Sum(x => x.Item2.Count))
);
autoTuner.AutoThrottleBatchSize(count, size, batchTimeWatcher.Elapsed);
var needToMoveToSingleStep = new HashSet <string>();
HashSet <string> set;
while (needToMoveToSingleStepQueue.TryDequeue(out set))
{
needToMoveToSingleStep.UnionWith(set);
}
foreach (var reduceKey in needToMoveToSingleStep)
{
string localReduceKey = reduceKey;
transactionalStorage.Batch(actions =>
actions.MapReduce.UpdatePerformedReduceType(index.IndexName, localReduceKey, ReduceType.SingleStep));
}
}
finally
{
long _;
autoTuner.CurrentlyUsedBatchSizes.TryRemove(reducingBatchThrottlerId, out _);
}
}
public IEnumerable<MappedResultInfo> GetItemsToReduce(GetItemsToReduceParams getItemsToReduceParams, CancellationToken cancellationToken)
{
var scheduledReductionsByViewAndLevelAndReduceKey = tableStorage.ScheduledReductions.GetIndex(Tables.ScheduledReductions.Indices.ByViewAndLevelAndReduceKey);
var deleter = new ScheduledReductionDeleter(getItemsToReduceParams.ItemsToDelete, o =>
{
var etag = o as Etag;
if (etag == null)
return null;
return (Slice)etag.ToString();
});
var seenLocally = new HashSet<ReduceKeyAndBucket>(ReduceKeyAndBucketEqualityComparer.Instance);
var keysToRemove = new List<string>();
foreach (var reduceKey in getItemsToReduceParams.ReduceKeys)
{
cancellationToken.ThrowIfCancellationRequested();
var reduceKeyHash = HashKey(reduceKey);
var viewAndLevelAndReduceKey = (Slice) CreateKey(getItemsToReduceParams.Index, getItemsToReduceParams.Level, ReduceKeySizeLimited(reduceKey), reduceKeyHash);
using (var iterator = scheduledReductionsByViewAndLevelAndReduceKey.MultiRead(Snapshot, viewAndLevelAndReduceKey))
{
if (!iterator.Seek(Slice.BeforeAllKeys))
continue;
do
{
cancellationToken.ThrowIfCancellationRequested();
if (getItemsToReduceParams.Take <= 0)
break;
ushort version;
var value = LoadStruct(tableStorage.ScheduledReductions, iterator.CurrentKey, writeBatch.Value, out version);
if (value == null) // TODO: Check if this is correct.
continue;
var reduceKeyFromDb = value.ReadString(ScheduledReductionFields.ReduceKey);
var bucket = value.ReadInt(ScheduledReductionFields.Bucket);
var rowKey = new ReduceKeyAndBucket(bucket, reduceKeyFromDb);
var thisIsNewScheduledReductionRow = deleter.Delete(iterator.CurrentKey, Etag.Parse(value.ReadBytes(ScheduledReductionFields.Etag)));
var neverSeenThisKeyAndBucket = getItemsToReduceParams.ItemsAlreadySeen.Add(rowKey);
if (thisIsNewScheduledReductionRow || neverSeenThisKeyAndBucket)
{
if (seenLocally.Add(rowKey))
{
foreach (var mappedResultInfo in GetResultsForBucket(getItemsToReduceParams.Index, getItemsToReduceParams.Level, reduceKeyFromDb, bucket, getItemsToReduceParams.LoadData, cancellationToken))
{
getItemsToReduceParams.Take--;
yield return mappedResultInfo;
}
}
}
if (getItemsToReduceParams.Take <= 0)
yield break;
}
while (iterator.MoveNext());
}
keysToRemove.Add(reduceKey);
if (getItemsToReduceParams.Take <= 0)
yield break;
}
foreach (var keyToRemove in keysToRemove)
getItemsToReduceParams.ReduceKeys.Remove(keyToRemove);
}
public IList<MappedResultInfo> GetItemsToReduce(GetItemsToReduceParams getItemsToReduceParams, CancellationToken cancellationToken)
{
var scheduledReductionsByViewAndLevelAndReduceKey = tableStorage.ScheduledReductions.GetIndex(Tables.ScheduledReductions.Indices.ByViewAndLevelAndReduceKey);
var deleter = new ScheduledReductionDeleter(getItemsToReduceParams.ItemsToDelete, o =>
{
var etag = o as Etag;
if (etag == null)
return null;
return (Slice)etag.ToString();
});
var keysToRemove = new List<string>();
try
{
var seenLocally = new HashSet<ReduceKeyAndBucket>(ReduceKeyAndBucketEqualityComparer.Instance);
var mappedResults = new List<MappedResultInfo>();
var first = true;
foreach (var reduceKey in getItemsToReduceParams.ReduceKeys)
{
cancellationToken.ThrowIfCancellationRequested();
Slice start = Slice.BeforeAllKeys;
bool needToMoveNext = false;
if (first)
{
first = false;
if (getItemsToReduceParams.LastReduceKeyAndBucket != null)
{
if (getItemsToReduceParams.LastReduceKeyAndBucket.ReduceKey != reduceKey)
{
throw new InvalidOperationException("Mismatches last reduce key with the remaining reduce keys in the params");
}
needToMoveNext = true;
start = CreateBucketAndEtagKey(getItemsToReduceParams.LastReduceKeyAndBucket.Bucket, Etag.Empty);
}
}
var viewAndLevelAndReduceKey = CreateScheduleReductionKey(getItemsToReduceParams.Index, getItemsToReduceParams.Level, reduceKey);
using (var iterator = scheduledReductionsByViewAndLevelAndReduceKey.MultiRead(Snapshot, viewAndLevelAndReduceKey))
{
if (!iterator.Seek(start))
continue;
if(needToMoveNext && iterator.MoveNext() ==false)
continue;
do
{
cancellationToken.ThrowIfCancellationRequested();
if (getItemsToReduceParams.Take <= 0)
break;
var idValueReader = iterator.CurrentKey.CreateReader();
idValueReader.ReadBigEndianInt32(); // bucket
int _;
var id = new Slice(Etag.Parse(idValueReader.ReadBytes(16, out _)));
ushort version;
var value = LoadStruct(tableStorage.ScheduledReductions, id, writeBatch.Value, out version);
if (value == null) // TODO: Check if this is correct.
continue;
var reduceKeyFromDb = value.ReadString(ScheduledReductionFields.ReduceKey);
var bucket = value.ReadInt(ScheduledReductionFields.Bucket);
var rowKey = new ReduceKeyAndBucket(bucket, reduceKeyFromDb);
var thisIsNewScheduledReductionRow = deleter.Delete(iterator.CurrentKey, Etag.Parse(value.ReadBytes(ScheduledReductionFields.Etag)));
if (thisIsNewScheduledReductionRow)
{
if (seenLocally.Add(rowKey))
{
getItemsToReduceParams.LastReduceKeyAndBucket = rowKey;
foreach (var mappedResultInfo in GetResultsForBucket(getItemsToReduceParams.Index, getItemsToReduceParams.Level, reduceKeyFromDb, bucket, getItemsToReduceParams.LoadData, cancellationToken))
{
getItemsToReduceParams.Take--;
mappedResults.Add(mappedResultInfo);
}
}
}
if (getItemsToReduceParams.Take <= 0)
return mappedResults;
}
while (iterator.MoveNext());
}
keysToRemove.Add(reduceKey);
if (getItemsToReduceParams.Take <= 0)
break;
}
return mappedResults;
}
finally
{
foreach (var keyToRemove in keysToRemove)
getItemsToReduceParams.ReduceKeys.Remove(keyToRemove);
}
}
public IEnumerable <MappedResultInfo> GetItemsToReduce(GetItemsToReduceParams getItemsToReduceParams)
{
var scheduledReductionsByViewAndLevelAndReduceKey = tableStorage.ScheduledReductions.GetIndex(Tables.ScheduledReductions.Indices.ByViewAndLevelAndReduceKey);
var deleter = new ScheduledReductionDeleter(getItemsToReduceParams.ItemsToDelete, o =>
{
var json = o as RavenJObject;
if (json == null)
{
return(null);
}
var etag = Etag.Parse(json.Value <byte[]>("etag"));
return(etag.ToString());
});
var seenLocally = new HashSet <Tuple <string, int> >();
foreach (var reduceKey in getItemsToReduceParams.ReduceKeys.ToArray())
{
var reduceKeyHash = HashKey(reduceKey);
var viewAndLevelAndReduceKey = CreateKey(getItemsToReduceParams.Index, getItemsToReduceParams.Level, reduceKey, reduceKeyHash);
using (var iterator = scheduledReductionsByViewAndLevelAndReduceKey.MultiRead(Snapshot, viewAndLevelAndReduceKey))
{
if (!iterator.Seek(Slice.BeforeAllKeys))
{
continue;
}
do
{
if (getItemsToReduceParams.Take <= 0)
{
break;
}
ushort version;
var value = LoadJson(tableStorage.ScheduledReductions, iterator.CurrentKey, writeBatch.Value, out version);
var reduceKeyFromDb = value.Value <string>("reduceKey");
var bucket = value.Value <int>("bucket");
var rowKey = Tuple.Create(reduceKeyFromDb, bucket);
var thisIsNewScheduledReductionRow = deleter.Delete(iterator.CurrentKey, value);
var neverSeenThisKeyAndBucket = getItemsToReduceParams.ItemsAlreadySeen.Add(rowKey);
if (thisIsNewScheduledReductionRow || neverSeenThisKeyAndBucket)
{
if (seenLocally.Add(rowKey))
{
foreach (var mappedResultInfo in GetResultsForBucket(getItemsToReduceParams.Index, getItemsToReduceParams.Level, reduceKeyFromDb, bucket, getItemsToReduceParams.LoadData))
{
getItemsToReduceParams.Take--;
yield return(mappedResultInfo);
}
}
}
if (getItemsToReduceParams.Take <= 0)
{
yield break;
}
}while (iterator.MoveNext());
}
getItemsToReduceParams.ReduceKeys.Remove(reduceKey);
if (getItemsToReduceParams.Take <= 0)
{
yield break;
}
}
}
public IEnumerable <MappedResultInfo> GetItemsToReduce(GetItemsToReduceParams getItemsToReduceParams)
{
var seenLocally = new HashSet <Tuple <string, int> >();
foreach (var reduceKey in getItemsToReduceParams.ReduceKeys.ToArray())
{
var keyCriteria = new RavenJObject
{
{ "view", getItemsToReduceParams.Index },
{ "level", getItemsToReduceParams.Level },
{ "reduceKey", reduceKey }
};
foreach (var result in storage.ScheduleReductions["ByViewLevelReduceKeyAndBucket"].SkipTo(keyCriteria))
{
var indexFromDb = result.Value <string>("view");
var levelFromDb = result.Value <int>("level");
var reduceKeyFromDb = result.Value <string>("reduceKey");
if (string.Equals(indexFromDb, getItemsToReduceParams.Index, StringComparison.InvariantCultureIgnoreCase) == false ||
levelFromDb != getItemsToReduceParams.Level)
{
break;
}
if (string.Equals(reduceKeyFromDb, reduceKey, StringComparison.Ordinal) == false)
{
break;
}
var bucket = result.Value <int>("bucket");
var rowKey = Tuple.Create(reduceKeyFromDb, bucket);
var thisIsNewScheduledReductionRow = getItemsToReduceParams.ItemsToDelete.Contains(result, RavenJTokenEqualityComparer.Default) == false;
var neverSeenThisKeyAndBucket = getItemsToReduceParams.ItemsAlreadySeen.Add(rowKey);
if (thisIsNewScheduledReductionRow || neverSeenThisKeyAndBucket)
{
if (seenLocally.Add(rowKey))
{
foreach (var mappedResultInfo in GetResultsForBucket(getItemsToReduceParams.Index, getItemsToReduceParams.Level, reduceKeyFromDb, bucket, getItemsToReduceParams.LoadData))
{
getItemsToReduceParams.Take--;
yield return(mappedResultInfo);
}
}
}
if (thisIsNewScheduledReductionRow)
{
getItemsToReduceParams.ItemsToDelete.Add(result);
}
if (getItemsToReduceParams.Take <= 0)
{
break;
}
}
getItemsToReduceParams.ReduceKeys.Remove(reduceKey);
if (getItemsToReduceParams.Take <= 0)
{
break;
}
}
}
