Add compaction of mutable segments for index blocks

src/dbnode/server/server.go

@@ -1098,6 +1098,8 @@ func withEncodingAndPoolingOptions(
 		SetInstrumentOptions(iopts).
 		SetMemSegmentOptions(
 			opts.IndexOptions().MemSegmentOptions().SetInstrumentOptions(iopts)).
+		SetFSTSegmentOptions(
+			opts.IndexOptions().FSTSegmentOptions().SetInstrumentOptions(iopts)).
 		SetIdentifierPool(identifierPool).
 		SetCheckedBytesPool(bytesPool).
 		SetResultsPool(resultsPool)

src/dbnode/storage/index/active_segment.go

@@ -0,0 +1,75 @@
+// Copyright (c) 2018 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package index
+
+import (
+	"time"
+
+	"github.com/m3db/m3/src/m3ninx/index/segment"
+)
+
+type readableSegment interface {
+	Age() time.Duration
+}
+
+type mutableReadableSeg struct {
+	createdAt time.Time
+	segment   segment.MutableSegment
+}
+
+var _ readableSegment = &mutableReadableSeg{}
+
+func newMutableReadableSeg(seg segment.MutableSegment) *mutableReadableSeg {
+	return &mutableReadableSeg{
+		createdAt: time.Now(),
+		segment:   seg,
+	}
+}
+
+func (s *mutableReadableSeg) Segment() segment.MutableSegment {
+	return s.segment
+}
+
+func (s *mutableReadableSeg) Age() time.Duration {
+	return time.Since(s.createdAt)
+}
+
+type readableSeg struct {
+	createdAt time.Time
+	segment   segment.Segment
+}
+
+var _ readableSegment = &readableSeg{}
+
+func newReadableSeg(seg segment.Segment) *readableSeg {
+	return &readableSeg{
+		createdAt: time.Now(),
+		segment:   seg,
+	}
+}
+
+func (s *readableSeg) Segment() segment.Segment {
+	return s.segment
+}
+
+func (s *readableSeg) Age() time.Duration {
+	return time.Since(s.createdAt)
+}