Run OOO compaction after restart if there is OOO data from WBL (#320)

Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>

Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>

tsdb/db.go

@@ -859,6 +859,11 @@ func open(dir string, l log.Logger, r prometheus.Registerer, opts *Options, rngs
 		}
 	}
 
+	if db.head.MinOOOTime() != int64(math.MaxInt64) {
+		// Some OOO data was replayed from the disk that needs compaction and cleanup.
+		db.oooWasEnabled.Store(true)
+	}
+
 	go db.run()
 
 	return db, nil

tsdb/db_test.go

@@ -5435,3 +5435,87 @@ func TestPanicOnApplyConfig(t *testing.T) {
 	})
 	require.NoError(t, err)
 }
+
+func TestDiskFillingUpAfterDisablingOOO(t *testing.T) {
+	dir := t.TempDir()
+
+	opts := DefaultOptions()
+	opts.OutOfOrderTimeWindow = 60 * time.Minute.Milliseconds()
+	opts.AllowOverlappingQueries = true
+
+	db, err := Open(dir, nil, nil, opts, nil)
+	require.NoError(t, err)
+	db.DisableCompactions()
+	t.Cleanup(func() {
+		require.NoError(t, db.Close())
+	})
+
+	series1 := labels.FromStrings("foo", "bar1")
+	var allSamples []tsdbutil.Sample
+	addSamples := func(fromMins, toMins int64) {
+		app := db.Appender(context.Background())
+		for min := fromMins; min <= toMins; min++ {
+			ts := min * time.Minute.Milliseconds()
+			_, err := app.Append(0, series1, ts, float64(ts))
+			require.NoError(t, err)
+			allSamples = append(allSamples, sample{t: ts, v: float64(ts)})
+		}
+		require.NoError(t, app.Commit())
+	}
+
+	// In-order samples.
+	addSamples(290, 300)
+	// OOO samples.
+	addSamples(250, 299)
+
+	// Restart DB with OOO disabled.
+	require.NoError(t, db.Close())
+	opts.OutOfOrderTimeWindow = 0
+	db, err = Open(db.dir, nil, prometheus.NewRegistry(), opts, nil)
+	require.NoError(t, err)
+	db.DisableCompactions()
+
+	ms := db.head.series.getByHash(series1.Hash(), series1)
+	require.Greater(t, len(ms.oooMmappedChunks), 0, "OOO mmap chunk was not replayed")
+
+	checkMmapFileContents := func(contains, notContains []string) {
+		mmapDir := mmappedChunksDir(db.head.opts.ChunkDirRoot)
+		files, err := os.ReadDir(mmapDir)
+		require.NoError(t, err)
+
+		fnames := make([]string, 0, len(files))
+		for _, f := range files {
+			fnames = append(fnames, f.Name())
+		}
+
+		for _, f := range contains {
+			require.Contains(t, fnames, f)
+		}
+		for _, f := range notContains {
+			require.NotContains(t, fnames, f)
+		}
+	}
+
+	// Add in-order samples until ready for compaction..
+	addSamples(301, 500)
+
+	// Check that m-map files gets deleted properly after compactions.
+
+	checkMmapFileContents([]string{"000001", "000002"}, nil)
+	require.NoError(t, db.Compact())
+	checkMmapFileContents([]string{"000002"}, []string{"000001"})
+	require.Equal(t, 0, len(ms.oooMmappedChunks), "OOO mmap chunk was not compacted")
+
+	addSamples(501, 650)
+	checkMmapFileContents([]string{"000002", "000003"}, []string{"000001"})
+	require.NoError(t, db.Compact())
+	checkMmapFileContents(nil, []string{"000001", "000002", "000003"})
+
+	// Verify that WBL is empty.
+	files, err := os.ReadDir(db.head.wbl.Dir())
+	require.NoError(t, err)
+	require.Len(t, files, 1) // Last empty file after compaction.
+	finfo, err := files[0].Info()
+	require.NoError(t, err)
+	require.Equal(t, int64(0), finfo.Size())
+}