Make sure we adjust per subject info when doing a Compact().

Signed-off-by: Derek Collison <derek@nats.io>

server/filestore.go

@@ -3125,6 +3125,7 @@ func (fs *fileStore) expireMsgs() {
 	fs.mu.RLock()
 	minAge := time.Now().UnixNano() - int64(fs.cfg.MaxAge)
 	fs.mu.RUnlock()
+
 	for sm, _ = fs.msgForSeq(0, &smv); sm != nil && sm.ts <= minAge; sm, _ = fs.msgForSeq(0, &smv) {
 		fs.removeMsg(sm.seq, false, true)
 	}
@@ -4859,6 +4860,12 @@ func (fs *fileStore) Compact(seq uint64) (uint64, error) {
 		mb.mu.Lock()
 		purged += mb.msgs
 		bytes += mb.bytes
+		// Make sure we do subject cleanup as well.
+		mb.ensurePerSubjectInfoLoaded()
+		for subj := range mb.fss {
+			fs.removePerSubject(subj)
+		}
+		// Now close.
 		mb.dirtyCloseWithRemove(true)
 		mb.mu.Unlock()
 		deleted++

server/filestore_test.go

@@ -1,4 +1,4 @@
-// Copyright 2019-2022 The NATS Authors
+// Copyright 2019-2023 The NATS Authors
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -5197,3 +5197,33 @@ func TestFileStoreStreamTruncateResetMultiBlock(t *testing.T) {
 		require_True(t, state.NumDeleted == 0)
 	})
 }
+
+func TestFileStoreStreamCompactMultiBlockSubjectInfo(t *testing.T) {
+	testFileStoreAllPermutations(t, func(t *testing.T, fcfg FileStoreConfig) {
+		fcfg.BlockSize = 128
+
+		fs, err := newFileStore(
+			fcfg,
+			StreamConfig{Name: "zzz", Subjects: []string{"foo.*"}, Storage: FileStorage},
+		)
+		require_NoError(t, err)
+		defer fs.Stop()
+
+		for i := 0; i < 1000; i++ {
+			subj := fmt.Sprintf("foo.%d", i)
+			_, _, err := fs.StoreMsg(subj, nil, []byte("Hello World"))
+			require_NoError(t, err)
+		}
+		require_True(t, fs.numMsgBlocks() == 500)
+
+		// Compact such that we know we throw blocks away from the beginning.
+		deleted, err := fs.Compact(501)
+		require_NoError(t, err)
+		require_True(t, deleted == 500)
+		require_True(t, fs.numMsgBlocks() == 250)
+
+		// Make sure we adjusted for subjects etc.
+		state := fs.State()
+		require_True(t, state.NumSubjects == 500)
+	})
+}

server/memstore.go

@@ -541,6 +541,7 @@ func (ms *memStore) Compact(seq uint64) (uint64, error) {
 				bytes += memStoreMsgSize(sm.subj, sm.hdr, sm.msg)
 				purged++
 				delete(ms.msgs, seq)
+				ms.removeSeqPerSubject(sm.subj, seq)
 			}
 		}
 		ms.state.Msgs -= purged

server/memstore_test.go

@@ -1,4 +1,4 @@
-// Copyright 2019-2022 The NATS Authors
+// Copyright 2019-2023 The NATS Authors
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
@@ -495,3 +495,28 @@ func TestMemStoreStreamTruncateReset(t *testing.T) {
 	require_True(t, state.NumSubjects == 1)
 	require_True(t, state.NumDeleted == 0)
 }
+
+func TestMemStoreStreamCompactMultiBlockSubjectInfo(t *testing.T) {
+	cfg := &StreamConfig{
+		Name:     "TEST",
+		Storage:  MemoryStorage,
+		Subjects: []string{"foo.*"},
+	}
+	ms, err := newMemStore(cfg)
+	require_NoError(t, err)
+
+	for i := 0; i < 1000; i++ {
+		subj := fmt.Sprintf("foo.%d", i)
+		_, _, err := ms.StoreMsg(subj, nil, []byte("Hello World"))
+		require_NoError(t, err)
+	}
+
+	// Compact such that we know we throw blocks away from the beginning.
+	deleted, err := ms.Compact(501)
+	require_NoError(t, err)
+	require_True(t, deleted == 500)
+
+	// Make sure we adjusted for subjects etc.
+	state := ms.State()
+	require_True(t, state.NumSubjects == 500)
+}