[service] Remove getBallastSize from service (#10696)

#### Description

This PR removes all ballast logic from service. This effectively
deprecates the ballastextension as including the extension with this
service would do nothing.

Related to
#10671

#### Link to tracking issue
Closes
#8342

#### Testing
Unit tests.

.chloggen/service-remove-ballast-deps-2.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: processor/memorylimiter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: The memory limiter processor will no longer account for ballast size.
+
+# One or more tracking issues or pull requests related to the change
+issues: [10696]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: If you are already using GOMEMLIMIT instead of the ballast extension this does not affect you.
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

.chloggen/service-remove-ballast-deps-3.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: extension/memorylimiter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: The memory limiter extension will no longer account for ballast size.
+
+# One or more tracking issues or pull requests related to the change
+issues: [10696]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: If you are already using GOMEMLIMIT instead of the ballast extension this does not affect you.
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

.chloggen/service-remove-ballast-deps.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: service
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: The service will no longer be able to get a ballast size from the deprecated ballast extension.
+
+# One or more tracking issues or pull requests related to the change
+issues: [10696]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: If you are already using GOMEMLIMIT instead of the ballast extension this does not affect you.
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

internal/memorylimiter/memorylimiter.go

@@ -44,7 +44,6 @@ type MemoryLimiter struct {
 	usageChecker memUsageChecker
 
 	memCheckWait time.Duration
-	ballastSize  uint64
 
 	// mustRefuse is used to indicate when data should be refused.
 	mustRefuse *atomic.Bool
@@ -58,8 +57,7 @@ type MemoryLimiter struct {
 	readMemStatsFn func(m *runtime.MemStats)
 
 	// Fields used for logging.
-	logger                 *zap.Logger
-	configMismatchedLogged bool
+	logger *zap.Logger
 
 	refCounterLock sync.Mutex
 	refCounter     int
@@ -114,14 +112,7 @@ func (ml *MemoryLimiter) startMonitoring() {
 	}
 }
 
-func (ml *MemoryLimiter) Start(_ context.Context, host component.Host) error {
-	extensions := host.GetExtensions()
-	for _, extension := range extensions {
-		if ext, ok := extension.(interface{ GetBallastSize() uint64 }); ok {
-			ml.ballastSize = ext.GetBallastSize()
-			break
-		}
-	}
+func (ml *MemoryLimiter) Start(_ context.Context, _ component.Host) error {
 	ml.startMonitoring()
 	return nil
 }
@@ -168,16 +159,6 @@ func getMemUsageChecker(cfg *Config, logger *zap.Logger) (*memUsageChecker, erro
 func (ml *MemoryLimiter) readMemStats() *runtime.MemStats {
 	ms := &runtime.MemStats{}
 	ml.readMemStatsFn(ms)
-	// If proper configured ms.Alloc should be at least ml.ballastSize but since
-	// a misconfiguration is possible check for that here.
-	if ms.Alloc >= ml.ballastSize {
-		ms.Alloc -= ml.ballastSize
-	} else if !ml.configMismatchedLogged {
-		// This indicates misconfiguration. Log it once.
-		ml.configMismatchedLogged = true
-		ml.logger.Warn(`"size_mib" in ballast extension is likely incorrectly configured.`)
-	}
-
 	return ms
 }
 

internal/memorylimiter/memorylimiter_test.go

@@ -4,17 +4,14 @@
 package memorylimiter
 
 import (
-	"context"
 	"runtime"
 	"sync/atomic"
 	"testing"
-	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/zap"
 
-	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/internal/iruntime"
 )
 
@@ -43,22 +40,6 @@ func TestMemoryPressureResponse(t *testing.T) {
 	ml.CheckMemLimits()
 	assert.True(t, ml.MustRefuse())
 
-	// Check ballast effect
-	ml.ballastSize = 1000
-
-	// Below memAllocLimit accounting for ballast.
-	currentMemAlloc = 800 + ml.ballastSize
-	ml.CheckMemLimits()
-	assert.False(t, ml.MustRefuse())
-
-	// Above memAllocLimit even accounting for ballast.
-	currentMemAlloc = 1800 + ml.ballastSize
-	ml.CheckMemLimits()
-	assert.True(t, ml.MustRefuse())
-
-	// Restore ballast to default.
-	ml.ballastSize = 0
-
 	// Check spike limit
 	ml.usageChecker.memSpikeLimit = 512
 
@@ -151,38 +132,3 @@ func TestRefuseDecision(t *testing.T) {
 		})
 	}
 }
-
-func TestBallastSize(t *testing.T) {
-	cfg := &Config{
-		CheckInterval:  10 * time.Second,
-		MemoryLimitMiB: 1024,
-	}
-	got, err := NewMemoryLimiter(cfg, zap.NewNop())
-	require.NoError(t, err)
-
-	got.startMonitoring()
-	require.NoError(t, got.Start(context.Background(), &host{ballastSize: 113}))
-	assert.Equal(t, uint64(113), got.ballastSize)
-	require.NoError(t, got.Shutdown(context.Background()))
-}
-
-type host struct {
-	ballastSize uint64
-	component.Host
-}
-
-func (h *host) GetExtensions() map[component.ID]component.Component {
-	ret := make(map[component.ID]component.Component)
-	ret[component.MustNewID("ballast")] = &ballastExtension{ballastSize: h.ballastSize}
-	return ret
-}
-
-type ballastExtension struct {
-	ballastSize uint64
-	component.StartFunc
-	component.ShutdownFunc
-}
-
-func (be *ballastExtension) GetBallastSize() uint64 {
-	return be.ballastSize
-}