Fixed: Progressively degrading performance issue in Pending/Delayed releases system

src/NzbDrone.Core.Test/Download/Pending/PendingReleaseServiceTests/AddFixture.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using FizzWare.NBuilder;
 using Marr.Data;
 using Moq;
@@ -26,6 +27,7 @@ namespace NzbDrone.Core.Test.Download.Pending.PendingReleaseServiceTests
         private ReleaseInfo _release;
         private ParsedAlbumInfo _parsedAlbumInfo;
         private RemoteAlbum _remoteAlbum;
+        private List<PendingRelease> _heldReleases;
 
         [SetUp]
         public void Setup()
@@ -63,14 +65,24 @@ namespace NzbDrone.Core.Test.Download.Pending.PendingReleaseServiceTests
             
             _temporarilyRejected = new DownloadDecision(_remoteAlbum, new Rejection("Temp Rejected", RejectionType.Temporary));
 
+            _heldReleases = new List<PendingRelease>();
+
             Mocker.GetMock<IPendingReleaseRepository>()
                   .Setup(s => s.All())
-                  .Returns(new List<PendingRelease>());
+                  .Returns(_heldReleases);
+
+            Mocker.GetMock<IPendingReleaseRepository>()
+                  .Setup(s => s.AllByArtistId(It.IsAny<int>()))
+                  .Returns<int>(i => _heldReleases.Where(v => v.ArtistId == i).ToList());
 
             Mocker.GetMock<IArtistService>()
                   .Setup(s => s.GetArtist(It.IsAny<int>()))
                   .Returns(_artist);
 
+            Mocker.GetMock<IArtistService>()
+                  .Setup(s => s.GetArtists(It.IsAny<IEnumerable<int>>()))
+                  .Returns(new List<Artist> { _artist });
+
             Mocker.GetMock<IParsingService>()
                   .Setup(s => s.GetAlbums(It.IsAny<ParsedAlbumInfo>(), _artist, null))
                   .Returns(new List<Album> {_album});
@@ -80,7 +92,7 @@ namespace NzbDrone.Core.Test.Download.Pending.PendingReleaseServiceTests
                   .Returns((List<DownloadDecision> d) => d);
         }
 
-        private void GivenHeldRelease(string title, string indexer, DateTime publishDate)
+        private void GivenHeldRelease(string title, string indexer, DateTime publishDate, PendingReleaseReason reason = PendingReleaseReason.Delay)
         {
             var release = _release.JsonClone();
             release.Indexer = indexer;
@@ -92,11 +104,10 @@ namespace NzbDrone.Core.Test.Download.Pending.PendingReleaseServiceTests
                                                    .With(h => h.ArtistId = _artist.Id)
                                                    .With(h => h.Title = title)
                                                    .With(h => h.Release = release)
+                                                   .With(h => h.Reason = reason)
                                                    .Build();
 
-            Mocker.GetMock<IPendingReleaseRepository>()
+            _heldReleases.AddRange(heldReleases);
-                  .Setup(s => s.All())
-                  .Returns(heldReleases);
         }
 
         [Test]
@@ -117,6 +128,29 @@ namespace NzbDrone.Core.Test.Download.Pending.PendingReleaseServiceTests
             VerifyNoInsert();
         }
 
+        [Test]
+        public void should_not_add_if_it_is_the_same_release_from_the_same_indexer_twice()
+        {
+            GivenHeldRelease(_release.Title, _release.Indexer, _release.PublishDate, PendingReleaseReason.DownloadClientUnavailable);
+            GivenHeldRelease(_release.Title, _release.Indexer, _release.PublishDate, PendingReleaseReason.Fallback);
+
+            Subject.Add(_temporarilyRejected, PendingReleaseReason.Delay);
+
+            VerifyNoInsert();
+        }
+
+        [Test]
+        public void should_remove_duplicate_if_it_is_the_same_release_from_the_same_indexer_twice()
+        {
+            GivenHeldRelease(_release.Title, _release.Indexer, _release.PublishDate, PendingReleaseReason.DownloadClientUnavailable);
+            GivenHeldRelease(_release.Title, _release.Indexer, _release.PublishDate, PendingReleaseReason.Fallback);
+
+            Subject.Add(_temporarilyRejected, PendingReleaseReason.Fallback);
+
+            Mocker.GetMock<IPendingReleaseRepository>()
+                  .Verify(v => v.Delete(It.IsAny<int>()), Times.Once());
+        }
+
         [Test]
         public void should_add_if_title_is_different()
         {

src/NzbDrone.Core.Test/Download/Pending/PendingReleaseServiceTests/RemoveGrabbedFixture.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 using FizzWare.NBuilder;
 using Marr.Data;
 using Moq;
@@ -26,6 +27,7 @@ namespace NzbDrone.Core.Test.Download.Pending.PendingReleaseServiceTests
         private ReleaseInfo _release;
         private ParsedAlbumInfo _parsedAlbumInfo;
         private RemoteAlbum _remoteAlbum;
+        private List<PendingRelease> _heldReleases;
 
         [SetUp]
         public void Setup()
@@ -63,14 +65,24 @@ namespace NzbDrone.Core.Test.Download.Pending.PendingReleaseServiceTests
             
             _temporarilyRejected = new DownloadDecision(_remoteAlbum, new Rejection("Temp Rejected", RejectionType.Temporary));
 
+            _heldReleases = new List<PendingRelease>();
+
             Mocker.GetMock<IPendingReleaseRepository>()
                   .Setup(s => s.All())
-                  .Returns(new List<PendingRelease>());
+                  .Returns(_heldReleases);
+
+            Mocker.GetMock<IPendingReleaseRepository>()
+                  .Setup(s => s.AllByArtistId(It.IsAny<int>()))
+                  .Returns<int>(i => _heldReleases.Where(v => v.ArtistId == i).ToList());
 
             Mocker.GetMock<IArtistService>()
                   .Setup(s => s.GetArtist(It.IsAny<int>()))
                   .Returns(_artist);
 
+            Mocker.GetMock<IArtistService>()
+                  .Setup(s => s.GetArtists(It.IsAny<IEnumerable<int>>()))
+                  .Returns(new List<Artist> { _artist });
+
             Mocker.GetMock<IParsingService>()
                   .Setup(s => s.GetAlbums(It.IsAny<ParsedAlbumInfo>(), _artist, null))
                   .Returns(new List<Album> {_album});
@@ -92,9 +104,7 @@ namespace NzbDrone.Core.Test.Download.Pending.PendingReleaseServiceTests
                                                    .With(h => h.ParsedAlbumInfo = parsedEpisodeInfo)
                                                    .Build();
 
-            Mocker.GetMock<IPendingReleaseRepository>()
+            _heldReleases.AddRange(heldReleases);
-                  .Setup(s => s.All())
-                  .Returns(heldReleases);
         }
 
         [Test]

src/NzbDrone.Core.Test/Download/Pending/PendingReleaseServiceTests/RemovePendingFixture.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using FizzWare.NBuilder;
 using Moq;
@@ -38,6 +38,10 @@ namespace NzbDrone.Core.Test.Download.Pending.PendingReleaseServiceTests
                   .Setup(s => s.GetArtist(It.IsAny<int>()))
                   .Returns(new Artist());
 
+            Mocker.GetMock<IArtistService>()
+                  .Setup(s => s.GetArtists(It.IsAny<IEnumerable<int>>()))
+                  .Returns(new List<Artist> { new Artist() });
+
             Mocker.GetMock<IParsingService>()
                   .Setup(s => s.GetAlbums(It.IsAny<ParsedAlbumInfo>(), It.IsAny<Artist>(), null))
                   .Returns(new List<Album>{ _album });

src/NzbDrone.Core.Test/Download/Pending/PendingReleaseServiceTests/RemoveRejectedFixture.cs

@@ -73,6 +73,10 @@ namespace NzbDrone.Core.Test.Download.Pending.PendingReleaseServiceTests
                   .Setup(s => s.GetArtist(It.IsAny<int>()))
                   .Returns(_artist);
 
+            Mocker.GetMock<IArtistService>()
+                  .Setup(s => s.GetArtists(It.IsAny<IEnumerable<int>>()))
+                  .Returns(new List<Artist> { _artist });
+
             Mocker.GetMock<IParsingService>()
                   .Setup(s => s.GetAlbums(It.IsAny<ParsedAlbumInfo>(), _artist, null))
                   .Returns(new List<Album> {_album});

src/NzbDrone.Core/DecisionEngine/Specifications/RssSync/DelaySpecification.cs

@@ -94,7 +94,7 @@ namespace NzbDrone.Core.DecisionEngine.Specifications.RssSync
 
             var albumIds = subject.Albums.Select(e => e.Id);
 
-            var oldest = _pendingReleaseService.OldestPendingRelease(subject.Artist.Id, albumIds);
+            var oldest = _pendingReleaseService.OldestPendingRelease(subject.Artist.Id, albumIds.ToArray());
 
             if (oldest != null && oldest.Release.AgeMinutes > delay)
             {

src/NzbDrone.Core/Download/Pending/PendingReleaseRepository.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using NzbDrone.Core.Datastore;
 using NzbDrone.Core.Messaging.Events;
 
@@ -8,6 +8,7 @@ namespace NzbDrone.Core.Download.Pending
     {
         void DeleteByArtistId(int artistId);
         List<PendingRelease> AllByArtistId(int artistId);
+        List<PendingRelease> WithoutFallback();
     }
 
     public class PendingReleaseRepository : BasicRepository<PendingRelease>, IPendingReleaseRepository
@@ -26,5 +27,10 @@ namespace NzbDrone.Core.Download.Pending
         {
             return Query.Where(p => p.ArtistId == artistId);
         }
+
+        public List<PendingRelease> WithoutFallback()
+        {
+            return Query.Where(p => p.Reason != PendingReleaseReason.Fallback);
+        }
     }
 }

src/NzbDrone.Core/Download/Pending/PendingReleaseService.cs

@@ -21,12 +21,13 @@ namespace NzbDrone.Core.Download.Pending
     public interface IPendingReleaseService
     {
         void Add(DownloadDecision decision, PendingReleaseReason reason);
+        void AddMany(List<Tuple<DownloadDecision, PendingReleaseReason>> decisions);
         List<ReleaseInfo> GetPending();
         List<RemoteAlbum> GetPendingRemoteAlbums(int artistId);
         List<Queue.Queue> GetPendingQueue();
         Queue.Queue FindPendingQueueItem(int queueId);
         void RemovePendingQueueItems(int queueId);
-        RemoteAlbum OldestPendingRelease(int artistId, IEnumerable<int> albumIds);
+        RemoteAlbum OldestPendingRelease(int artistId, int[] albumIds);
     }
 
     public class PendingReleaseService : IPendingReleaseService,
@@ -68,8 +69,27 @@ namespace NzbDrone.Core.Download.Pending
 
         public void Add(DownloadDecision decision, PendingReleaseReason reason)
         {
-            var alreadyPending = GetPendingReleases();
+            var alreadyPending = _repository.AllByArtistId(decision.RemoteAlbum.Artist.Id);
 
+            alreadyPending = IncludeRemoteAlbums(alreadyPending);
+
+            Add(alreadyPending, decision, reason);
+        }
+
+        public void AddMany(List<Tuple<DownloadDecision, PendingReleaseReason>> decisions)
+        {
+            var alreadyPending = decisions.Select(v => v.Item1.RemoteAlbum.Artist.Id).Distinct().SelectMany(_repository.AllByArtistId).ToList();
+
+            alreadyPending = IncludeRemoteAlbums(alreadyPending);
+
+            foreach (var pair in decisions)
+            {
+                Add(alreadyPending, pair.Item1, pair.Item2);
+            }
+        }
+
+        private void Add(List<PendingRelease> alreadyPending, DownloadDecision decision, PendingReleaseReason reason)
+        {
             var albumIds = decision.RemoteAlbum.Albums.Select(e => e.Id);
 
             var existingReports = alreadyPending.Where(r => r.RemoteAlbum.Albums.Select(e => e.Id)
@@ -80,22 +100,32 @@ namespace NzbDrone.Core.Download.Pending
 
             if (matchingReports.Any())
             {
-                var sameReason = true;
+                var matchingReport = matchingReports.First();
 
-                foreach (var matchingReport in matchingReports)
-                {
                 if (matchingReport.Reason != reason)
                 {
-                        _logger.Debug("The release {0} is already pending with reason {1}, changing to {2}", decision.RemoteAlbum, matchingReport.Reason, reason); matchingReport.Reason = reason;
+                    _logger.Debug("The release {0} is already pending with reason {1}, changing to {2}", decision.RemoteAlbum, matchingReport.Reason, reason);
+                    matchingReport.Reason = reason;
                     _repository.Update(matchingReport);
-                        sameReason = false;
-                    }
                 }
 
-                if (sameReason)
+                else
                 {
                     _logger.Debug("The release {0} is already pending with reason {1}, not adding again", decision.RemoteAlbum, reason); return;
                 }
+
+                if (matchingReports.Count() > 1)
+                {
+                    _logger.Debug("The release {0} had {1} duplicate pending, removing duplicates.", decision.RemoteAlbum, matchingReports.Count() - 1);
+
+                    foreach (var duplicate in matchingReports.Skip(1))
+                    {
+                        _repository.Delete(duplicate.Id);
+                        alreadyPending.Remove(duplicate);
+                    }
+                }
+
+                return;
             }
 
             _logger.Debug("Adding release {0} to pending releases with reason {1}", decision.RemoteAlbum, reason); Insert(decision, reason);
@@ -122,7 +152,7 @@ namespace NzbDrone.Core.Download.Pending
 
         public List<RemoteAlbum> GetPendingRemoteAlbums(int artistId)
         {
-            return _repository.AllByArtistId(artistId).Select(GetRemoteAlbum).ToList();
+            return IncludeRemoteAlbums(_repository.AllByArtistId(artistId)).Select(v => v.RemoteAlbum).ToList();
         }
 
         public List<Queue.Queue> GetPendingQueue()
@@ -131,7 +161,8 @@ namespace NzbDrone.Core.Download.Pending
 
             var nextRssSync = new Lazy<DateTime>(() => _taskManager.GetNextExecution(typeof(RssSyncCommand)));
 
-            foreach (var pendingRelease in GetPendingReleases().Where(p => p.Reason != PendingReleaseReason.Fallback))
+            var pendingReleases = IncludeRemoteAlbums(_repository.WithoutFallback());
+            foreach (var pendingRelease in pendingReleases)
             {
                 foreach (var album in pendingRelease.RemoteAlbum.Albums)
                 {
@@ -203,53 +234,53 @@ namespace NzbDrone.Core.Download.Pending
             _repository.DeleteMany(releasesToRemove.Select(c => c.Id));
         }
 
-        public RemoteAlbum OldestPendingRelease(int artistId, IEnumerable<int> albumIds)
+        public RemoteAlbum OldestPendingRelease(int artistId, int[] albumIds)
         {
-            return GetPendingRemoteAlbums(artistId).Where(r => r.Albums.Select(e => e.Id).Intersect(albumIds).Any())
+            var artistReleases = GetPendingReleases(artistId);
+
+            return artistReleases.Select(r => r.RemoteAlbum)
+                                 .Where(r => r.Albums.Select(e => e.Id).Intersect(albumIds).Any())
                                  .OrderByDescending(p => p.Release.AgeHours)
                                  .FirstOrDefault();
         }
 
         private List<PendingRelease> GetPendingReleases()
         {
-            var result = new List<PendingRelease>();
+            return IncludeRemoteAlbums(_repository.All().ToList());
-
-            foreach (var release in _repository.All())
-            {
-                var remoteAlbum = GetRemoteAlbum(release);
-
-                if (remoteAlbum == null)
-                {
-                    continue;
-                }
-
-                release.RemoteAlbum = remoteAlbum;
-
-                result.Add(release);
         }
 
-            return result;
+        private List<PendingRelease> GetPendingReleases(int artistId)
+        {
+            return IncludeRemoteAlbums(_repository.AllByArtistId(artistId).ToList());
         }
 
-        private RemoteAlbum GetRemoteAlbum(PendingRelease release)
+        private List<PendingRelease> IncludeRemoteAlbums(List<PendingRelease> releases)
         {
-            var artist = _artistService.GetArtist(release.ArtistId);
+            var result = new List<PendingRelease>();
+            var artistMap = _artistService.GetArtists(releases.Select(v => v.ArtistId).Distinct())
+                                          .ToDictionary(v => v.Id);
 
-            //Just in case the series was removed, but wasn't cleaned up yet (housekeeper will clean it up)
+            foreach (var release in releases)
-            if (artist == null)
             {
-                return null;
+                var artist = artistMap.GetValueOrDefault(release.ArtistId);
-            }
+
+                // Just in case the artist was removed, but wasn't cleaned up yet (housekeeper will clean it up)
+                if (artist == null) return null;
 
-            var album = _parsingService.GetAlbums(release.ParsedAlbumInfo, artist);
+                var albums = _parsingService.GetAlbums(release.ParsedAlbumInfo, artist);
 
-            return new RemoteAlbum
+                release.RemoteAlbum = new RemoteAlbum
                 {
                     Artist = artist,
-                Albums = album,
+                    Albums = albums,
                     ParsedAlbumInfo = release.ParsedAlbumInfo,
                     Release = release.Release
                 };
+
+                result.Add(release);
+            }
+
+            return result;
         }
 
         private void Insert(DownloadDecision decision, PendingReleaseReason reason)
@@ -291,7 +322,7 @@ namespace NzbDrone.Core.Download.Pending
 
         private void RemoveGrabbed(RemoteAlbum remoteAlbum)
         {
-            var pendingReleases = GetPendingReleases();
+            var pendingReleases = GetPendingReleases(remoteAlbum.Artist.Id);
             var albumIds = remoteAlbum.Albums.Select(e => e.Id);
 
             var existingReports = pendingReleases.Where(r => r.RemoteAlbum.Albums.Select(e => e.Id)

src/NzbDrone.Core/Download/ProcessDownloadDecisions.cs

@@ -131,6 +131,8 @@ namespace NzbDrone.Core.Download
             var pending = new List<DownloadDecision>();
             var stored = new List<DownloadDecision>();
 
+            var addQueue = new List<Tuple<DownloadDecision, PendingReleaseReason>>();
+
             foreach (var report in failed)
             {
                 // If a release was already grabbed with matching albums we should store it as a fallback
@@ -141,22 +143,27 @@ namespace NzbDrone.Core.Download
 
                 if (IsAlbumProcessed(grabbed, report))
                 {
-                    _pendingReleaseService.Add(report, PendingReleaseReason.Fallback);
+                    addQueue.Add(Tuple.Create(report, PendingReleaseReason.Fallback));
                     pending.Add(report);
                 }
                 else if (IsAlbumProcessed(stored, report))
                 {
-                    _pendingReleaseService.Add(report, PendingReleaseReason.Fallback);
+                    addQueue.Add(Tuple.Create(report, PendingReleaseReason.Fallback));
                     pending.Add(report);
                 }
                 else
                 {
-                    _pendingReleaseService.Add(report, PendingReleaseReason.DownloadClientUnavailable);
+                    addQueue.Add(Tuple.Create(report, PendingReleaseReason.DownloadClientUnavailable));
                     pending.Add(report);
                     stored.Add(report);
                 }
             }
 
+            if (addQueue.Any())
+            {
+                _pendingReleaseService.AddMany(addQueue);
+            }
+
             return pending;
         }
     }