[dbnode] Add namespace runtime options for runtime per-namespace config changes

Makefile

@@ -187,7 +187,7 @@ install-tools:
 	GOBIN=$(tools_bin_path) go install github.com/mauricelam/genny
 	GOBIN=$(tools_bin_path) go install github.com/mjibson/esc
 	GOBIN=$(tools_bin_path) go install github.com/pointlander/peg
-	GOBIN=$(tools_bin_path) go install github.com/prateek/gorename
+	GOBIN=$(tools_bin_path) go install github.com/robskillington/gorename
 	GOBIN=$(tools_bin_path) go install github.com/rakyll/statik
 	GOBIN=$(tools_bin_path) go install github.com/garethr/kubeval
 

go.mod

@@ -82,13 +82,13 @@ require (
 	github.com/pointlander/jetset v1.0.0 // indirect
 	github.com/pointlander/peg v1.0.0
 	github.com/prashantv/protectmem v0.0.0-20171002184600-e20412882b3a // indirect
-	github.com/prateek/gorename v0.0.0-20180424020013-52c7307cddd2
 	github.com/prometheus/client_golang v1.5.1
 	github.com/prometheus/common v0.9.1
 	github.com/prometheus/prometheus v1.8.2-0.20200420081721-18254838fbe2
 	github.com/rakyll/statik v0.1.6
 	github.com/remeh/sizedwaitgroup v1.0.0 // indirect
 	github.com/rhysd/go-github-selfupdate v1.2.2 // indirect
+	github.com/robskillington/gorename v0.0.0-20180424020013-52c7307cddd2
 	github.com/russross/blackfriday v2.0.0+incompatible
 	github.com/rveen/ogdl v0.0.0-20200522080342-eeeda1a978e7 // indirect
 	github.com/satori/go.uuid v1.2.0

go.sum

@@ -604,8 +604,6 @@ github.com/pointlander/peg v1.0.0/go.mod h1:WJTMcgeWYr6fZz4CwHnY1oWZCXew8GWCF93F
 github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndrE9hABlRI=
 github.com/prashantv/protectmem v0.0.0-20171002184600-e20412882b3a h1:AA9vgIBDjMHPC2McaGPojgV2dcI78ZC0TLNhYCXEKH8=
 github.com/prashantv/protectmem v0.0.0-20171002184600-e20412882b3a/go.mod h1:lzZQ3Noex5pfAy7mkAeCjcBDteYU85uWWnJ/y6gKU8k=
-github.com/prateek/gorename v0.0.0-20180424020013-52c7307cddd2 h1:/pJs9wFXnmhD12W+dnwoNJXPtLsxa78y+vzC9i/Hs+A=
-github.com/prateek/gorename v0.0.0-20180424020013-52c7307cddd2/go.mod h1:nw9dXugFBQe1pshgrdeRjyYrY+RxNZckdWkiGHX8URE=
 github.com/prometheus/alertmanager v0.20.0/go.mod h1:9g2i48FAyZW6BtbsnvHtMHQXl2aVtrORKwKVCQ+nbrg=
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
 github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829/go.mod h1:p2iRAGwDERtqlqzRXnrOVns+ignqQo//hLXqYxZYVNs=
@@ -641,6 +639,8 @@ github.com/remeh/sizedwaitgroup v1.0.0 h1:VNGGFwNo/R5+MJBf6yrsr110p0m4/OX4S3DCy7
 github.com/remeh/sizedwaitgroup v1.0.0/go.mod h1:3j2R4OIe/SeS6YDhICBy22RWjJC5eNCJ1V+9+NVNYlo=
 github.com/rhysd/go-github-selfupdate v1.2.2 h1:G+mNzkc1wEtpmM6sFS/Ghkeq+ad4Yp6EZEHyp//wGEo=
 github.com/rhysd/go-github-selfupdate v1.2.2/go.mod h1:khesvSyKcXDUxeySCedFh621iawCks0dS/QnHPcpCws=
+github.com/robskillington/gorename v0.0.0-20180424020013-52c7307cddd2 h1:t+C9QFlvAI+evRn96lz7eKyzo1CgDx3YVx3N/GJIetk=
+github.com/robskillington/gorename v0.0.0-20180424020013-52c7307cddd2/go.mod h1:CVTJ4xwzb/4H98jrd7NFgNoTAiL63scr2Pl7kqOcQAQ=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rogpeppe/fastuuid v1.1.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=

src/cmd/services/m3coordinator/downsample/downsampler.go

@@ -23,7 +23,6 @@ package downsample
 import (
 	"time"
 
-	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 )
 
@@ -35,9 +34,14 @@ type Downsampler interface {
 // MetricsAppender is a metrics appender that can build a samples
 // appender, only valid to use with a single caller at a time.
 type MetricsAppender interface {
+	// NextMetric progresses to building the next metric.
+	NextMetric()
+	// AddTag adds a tag to the current metric being built.
 	AddTag(name, value []byte)
+	// SamplesAppender returns a samples appender for the current
+	// metric built with the tags that have been set.
 	SamplesAppender(opts SampleAppenderOptions) (SamplesAppenderResult, error)
-	Reset()
+	// Finalize finalizes the entire metrics appender for reuse.
 	Finalize()
 }
 
@@ -72,11 +76,9 @@ type SamplesAppender interface {
 }
 
 type downsampler struct {
-	opts DownsamplerOptions
-	agg  agg
-
-	debugLogging bool
-	logger       *zap.Logger
+	opts                DownsamplerOptions
+	agg                 agg
+	metricsAppenderOpts metricsAppenderOptions
 }
 
 type downsamplerOptions struct {
@@ -95,24 +97,27 @@ func newDownsampler(opts downsamplerOptions) (*downsampler, error) {
 		debugLogging = true
 	}
 
+	metricsAppenderOpts := metricsAppenderOptions{
+		agg:                          opts.agg.aggregator,
+		clientRemote:                 opts.agg.clientRemote,
+		defaultStagedMetadatasProtos: opts.agg.defaultStagedMetadatasProtos,
+		clockOpts:                    opts.agg.clockOpts,
+		tagEncoderPool:               opts.agg.pools.tagEncoderPool,
+		matcher:                      opts.agg.matcher,
+		metricTagsIteratorPool:       opts.agg.pools.metricTagsIteratorPool,
+		debugLogging:                 debugLogging,
+		logger:                       logger,
+	}
+
 	return &downsampler{
-		opts:         opts.opts,
-		agg:          opts.agg,
-		debugLogging: debugLogging,
-		logger:       logger,
+		opts:                opts.opts,
+		agg:                 opts.agg,
+		metricsAppenderOpts: metricsAppenderOpts,
 	}, nil
 }
 
 func (d *downsampler) NewMetricsAppender() (MetricsAppender, error) {
-	return newMetricsAppender(metricsAppenderOptions{
-		agg:                          d.agg.aggregator,
-		clientRemote:                 d.agg.clientRemote,
-		defaultStagedMetadatasProtos: d.agg.defaultStagedMetadatasProtos,
-		clockOpts:                    d.agg.clockOpts,
-		tagEncoder:                   d.agg.pools.tagEncoderPool.Get(),
-		matcher:                      d.agg.matcher,
-		metricTagsIteratorPool:       d.agg.pools.metricTagsIteratorPool,
-		debugLogging:                 d.debugLogging,
-		logger:                       d.logger,
-	}), nil
+	metricsAppender := d.agg.pools.metricsAppenderPool.Get()
+	metricsAppender.reset(d.metricsAppenderOpts)
+	return metricsAppender, nil
 }

src/cmd/services/m3coordinator/downsample/downsampler_test.go

@@ -989,7 +989,8 @@ func testDownsamplerAggregationIngest(
 		opts = *testOpts.sampleAppenderOpts
 	}
 	for _, metric := range testCounterMetrics {
-		appender.Reset()
+		appender.NextMetric()
+
 		for name, value := range metric.tags {
 			appender.AddTag([]byte(name), []byte(value))
 		}
@@ -1016,7 +1017,8 @@ func testDownsamplerAggregationIngest(
 		}
 	}
 	for _, metric := range testGaugeMetrics {
-		appender.Reset()
+		appender.NextMetric()
+
 		for name, value := range metric.tags {
 			appender.AddTag([]byte(name), []byte(value))
 		}
@@ -1116,13 +1118,20 @@ func newTestDownsampler(t *testing.T, opts testDownsamplerOptions) testDownsampl
 	tagEncoderOptions := serialize.NewTagEncoderOptions()
 	tagDecoderOptions := serialize.NewTagDecoderOptions(serialize.TagDecoderOptionsConfig{})
 	tagEncoderPoolOptions := pool.NewObjectPoolOptions().
+		SetSize(2).
 		SetInstrumentOptions(instrumentOpts.
 			SetMetricsScope(instrumentOpts.MetricsScope().
 				SubScope("tag-encoder-pool")))
 	tagDecoderPoolOptions := pool.NewObjectPoolOptions().
+		SetSize(2).
 		SetInstrumentOptions(instrumentOpts.
 			SetMetricsScope(instrumentOpts.MetricsScope().
 				SubScope("tag-decoder-pool")))
+	metricsAppenderPoolOptions := pool.NewObjectPoolOptions().
+		SetSize(2).
+		SetInstrumentOptions(instrumentOpts.
+			SetMetricsScope(instrumentOpts.MetricsScope().
+				SubScope("metrics-appender-pool")))
 
 	var cfg Configuration
 	if opts.remoteClientMock != nil {
@@ -1137,16 +1146,17 @@ func newTestDownsampler(t *testing.T, opts testDownsamplerOptions) testDownsampl
 	}
 
 	instance, err := cfg.NewDownsampler(DownsamplerOptions{
-		Storage:               storage,
-		ClusterClient:         clusterclient.NewMockClient(gomock.NewController(t)),
-		RulesKVStore:          rulesKVStore,
-		AutoMappingRules:      opts.autoMappingRules,
-		ClockOptions:          clockOpts,
-		InstrumentOptions:     instrumentOpts,
-		TagEncoderOptions:     tagEncoderOptions,
-		TagDecoderOptions:     tagDecoderOptions,
-		TagEncoderPoolOptions: tagEncoderPoolOptions,
-		TagDecoderPoolOptions: tagDecoderPoolOptions,
+		Storage:                    storage,
+		ClusterClient:              clusterclient.NewMockClient(gomock.NewController(t)),
+		RulesKVStore:               rulesKVStore,
+		AutoMappingRules:           opts.autoMappingRules,
+		ClockOptions:               clockOpts,
+		InstrumentOptions:          instrumentOpts,
+		TagEncoderOptions:          tagEncoderOptions,
+		TagDecoderOptions:          tagDecoderOptions,
+		TagEncoderPoolOptions:      tagEncoderPoolOptions,
+		TagDecoderPoolOptions:      tagDecoderPoolOptions,
+		MetricsAppenderPoolOptions: metricsAppenderPoolOptions,
 	})
 	require.NoError(t, err)
 

src/cmd/services/m3coordinator/downsample/metrics_appender.go

@@ -34,21 +34,47 @@ import (
 	"github.com/m3db/m3/src/metrics/metadata"
 	"github.com/m3db/m3/src/metrics/policy"
 	"github.com/m3db/m3/src/x/clock"
+	"github.com/m3db/m3/src/x/pool"
 	"github.com/m3db/m3/src/x/serialize"
 
 	"github.com/golang/protobuf/jsonpb"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 )
 
+type metricsAppenderPool struct {
+	pool pool.ObjectPool
+}
+
+func newMetricsAppenderPool(opts pool.ObjectPoolOptions) *metricsAppenderPool {
+	p := &metricsAppenderPool{
+		pool: pool.NewObjectPool(opts),
+	}
+	p.pool.Init(func() interface{} {
+		return newMetricsAppender(p)
+	})
+	return p
+}
+
+func (p *metricsAppenderPool) Get() *metricsAppender {
+	return p.pool.Get().(*metricsAppender)
+}
+
+func (p *metricsAppenderPool) Put(v *metricsAppender) {
+	p.pool.Put(v)
+}
+
 type metricsAppender struct {
 	metricsAppenderOptions
 
+	pool *metricsAppenderPool
+
 	tags                         *tags
 	multiSamplesAppender         *multiSamplesAppender
 	curr                         metadata.StagedMetadata
 	defaultStagedMetadatasCopies []metadata.StagedMetadatas
 	mappingRuleStoragePolicies   []policy.StoragePolicy
+	tagEncoder                   serialize.TagEncoder
 }
 
 // metricsAppenderOptions will have one of agg or clientRemote set.
@@ -57,23 +83,40 @@ type metricsAppenderOptions struct {
 	clientRemote client.Client
 
 	defaultStagedMetadatasProtos []metricpb.StagedMetadatas
-	tagEncoder                   serialize.TagEncoder
 	matcher                      matcher.Matcher
+	tagEncoderPool               serialize.TagEncoderPool
 	metricTagsIteratorPool       serialize.MetricTagsIteratorPool
 
 	clockOpts    clock.Options
 	debugLogging bool
 	logger       *zap.Logger
 }
 
-func newMetricsAppender(opts metricsAppenderOptions) *metricsAppender {
-	stagedMetadatasCopies := make([]metadata.StagedMetadatas,
-		len(opts.defaultStagedMetadatasProtos))
+func newMetricsAppender(pool *metricsAppenderPool) *metricsAppender {
 	return &metricsAppender{
-		metricsAppenderOptions:       opts,
-		tags:                         newTags(),
-		multiSamplesAppender:         newMultiSamplesAppender(),
-		defaultStagedMetadatasCopies: stagedMetadatasCopies,
+		pool:                 pool,
+		tags:                 newTags(),
+		multiSamplesAppender: newMultiSamplesAppender(),
+	}
+}
+
+// reset is called when pulled from the pool.
+func (a *metricsAppender) reset(opts metricsAppenderOptions) {
+	a.metricsAppenderOptions = opts
+	if a.tagEncoder == nil {
+		a.tagEncoder = opts.tagEncoderPool.Get()
+	}
+
+	// Make sure a.defaultStagedMetadatasCopies is right length.
+	capRequired := len(opts.defaultStagedMetadatasProtos)
+	if cap(a.defaultStagedMetadatasCopies) < capRequired {
+		// Too short, reallocate.
+		slice := make([]metadata.StagedMetadatas, capRequired)
+		a.defaultStagedMetadatasCopies = slice
+	} else {
+		// Has enough capacity, take subslice.
+		slice := a.defaultStagedMetadatasCopies[:capRequired]
+		a.defaultStagedMetadatasCopies = slice
 	}
 }
 
@@ -317,14 +360,14 @@ func (a *metricsAppender) debugLogMatch(str string, opts debugLogMatchOptions) {
 	a.logger.Debug(str, fields...)
 }
 
-func (a *metricsAppender) Reset() {
+func (a *metricsAppender) NextMetric() {
 	a.tags.names = a.tags.names[:0]
 	a.tags.values = a.tags.values[:0]
 }
 
 func (a *metricsAppender) Finalize() {
-	a.tagEncoder.Finalize()
-	a.tagEncoder = nil
+	// Return to pool.
+	a.pool.Put(a)
 }
 
 func stagedMetadatasLogField(sm metadata.StagedMetadatas) zapcore.Field {