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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
//go:build integrationTest
// +build integrationTest
package lsmkv
import (
"context"
"crypto/rand"
"encoding/json"
"sync"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/weaviate/weaviate/entities/cyclemanager"
)
// This test ensures that the WAL threshold is being adhered to, and that a
// flush to segment followed by a switch to a new WAL is being performed
// once the threshold is reached
func TestWriteAheadLogThreshold_Replace(t *testing.T) {
dirName := t.TempDir()
amount := 100
keys := make([][]byte, amount)
values := make([][]byte, amount)
walThreshold := uint64(4096)
tolerance := 4.
flushCallbacks := cyclemanager.NewCallbackGroup("flush", nullLogger(), 1)
flushCycle := cyclemanager.NewManager(cyclemanager.MemtableFlushCycleTicker(), flushCallbacks.CycleCallback)
flushCycle.Start()
bucket, err := NewBucket(testCtx(), dirName, "", nullLogger(), nil,
cyclemanager.NewCallbackGroupNoop(), flushCallbacks,
WithStrategy(StrategyReplace),
WithMemtableThreshold(1024*1024*1024),
WithWalThreshold(walThreshold))
require.Nil(t, err)
// generate only a small amount of sequential values. this allows
// us to keep the memtable small (the net additions will be close
// to zero), and focus on testing the WAL threshold
t.Run("generate sequential data", func(t *testing.T) {
for i := range keys {
n, err := json.Marshal(i)
require.Nil(t, err)
keys[i], values[i] = n, n
}
})
t.Run("check switchover during insertion", func(t *testing.T) {
// Importing data for over 10s with 1.6ms break between each object
// should result in ~100kB of commitlog data in total.
// With couple of flush attempts happening during this 10s period,
// and with threshold set to 4kB, first .wal size should be much smaller than 100kb
// when commitlog switched to new .wal file.
ctxTimeout, cancelTimeout := context.WithTimeout(context.Background(), 10*time.Second)
wg := &sync.WaitGroup{}
wg.Add(1)
go func() {
for {
for i := range keys {
if i%100 == 0 && ctxTimeout.Err() != nil {
wg.Done()
return
}
assert.Nil(t, bucket.Put(keys[i], values[i]))
time.Sleep(1600 * time.Microsecond)
}
}
}()
var firstWalFile string
var firstWalSize int64
out:
for {
time.Sleep(time.Millisecond)
if ctxTimeout.Err() != nil {
t.Fatalf("Import finished without flushing in the meantime. Size of first WAL file was (%d)", firstWalSize)
}
bucket.flushLock.RLock()
walFile := bucket.active.commitlog.path
walSize := bucket.active.commitlog.Size()
bucket.flushLock.RUnlock()
if firstWalFile == "" {
firstWalFile = walFile
}
if firstWalFile == walFile {
firstWalSize = walSize
} else {
// new path found; flush must have occurred - stop import and exit loop
cancelTimeout()
break out
}
}
wg.Wait()
if !isSizeWithinTolerance(t, uint64(firstWalSize), walThreshold, tolerance) {
t.Fatalf("WAL size (%d) was allowed to increase beyond threshold (%d) with tolerance of (%f)%%",
firstWalSize, walThreshold, tolerance*100)
}
})
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
require.Nil(t, bucket.Shutdown(ctx))
require.Nil(t, flushCycle.StopAndWait(ctx))
}
// This test ensures that the Memtable threshold is being adhered to, and
// that a flush to segment followed by a switch to a new WAL is being
// performed once the threshold is reached
func TestMemtableThreshold_Replace(t *testing.T) {
dirName := t.TempDir()
amount := 10000
sizePerValue := 8
keys := make([][]byte, amount)
values := make([][]byte, amount)
memtableThreshold := uint64(4096)
tolerance := 4.
flushCallbacks := cyclemanager.NewCallbackGroup("flush", nullLogger(), 1)
flushCycle := cyclemanager.NewManager(cyclemanager.MemtableFlushCycleTicker(), flushCallbacks.CycleCallback)
flushCycle.Start()
bucket, err := NewBucket(testCtx(), dirName, "", nullLogger(), nil,
cyclemanager.NewCallbackGroupNoop(), flushCallbacks,
WithStrategy(StrategyReplace),
WithMemtableThreshold(memtableThreshold))
require.Nil(t, err)
t.Run("generate random data", func(t *testing.T) {
for i := range keys {
n, err := json.Marshal(i)
require.Nil(t, err)
keys[i] = n
values[i] = make([]byte, sizePerValue)
rand.Read(values[i])
}
})
t.Run("check switchover during insertion", func(t *testing.T) {
// Importing data for over 10s with 0.8ms break between each object
// should result in ~100kB of memtable data.
// With couple of flush attempts happening during this 10s period,
// and with threshold set to 4kB, first memtable size should be much smaller than 100kb
// when memtable flushed and replaced with new one
ctxTimeout, cancelTimeout := context.WithTimeout(context.Background(), 10*time.Second)
wg := &sync.WaitGroup{}
wg.Add(1)
go func() {
for {
for i := range keys {
if i%100 == 0 && ctxTimeout.Err() != nil {
wg.Done()
return
}
assert.Nil(t, bucket.Put(keys[i], values[i]))
time.Sleep(800 * time.Microsecond)
}
}
}()
var firstMemtablePath string
var firstMemtableSize uint64
out:
for {
time.Sleep(time.Millisecond)
if ctxTimeout.Err() != nil {
t.Fatalf("Import finished without flushing in the meantime. Size of first memtable was (%d)", firstMemtableSize)
}
bucket.flushLock.RLock()
activePath := bucket.active.path
activeSize := bucket.active.Size()
bucket.flushLock.RUnlock()
if firstMemtablePath == "" {
firstMemtablePath = activePath
}
if firstMemtablePath == activePath {
firstMemtableSize = activeSize
} else {
// new path found; flush must have occurred - stop import and exit loop
cancelTimeout()
break out
}
}
wg.Wait()
if !isSizeWithinTolerance(t, uint64(firstMemtableSize), memtableThreshold, tolerance) {
t.Fatalf("Memtable size (%d) was allowed to increase beyond threshold (%d) with tolerance of (%f)%%",
firstMemtableSize, memtableThreshold, tolerance*100)
}
})
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
require.Nil(t, bucket.Shutdown(ctx))
require.Nil(t, flushCycle.StopAndWait(ctx))
}
func isSizeWithinTolerance(t *testing.T, detectedSize uint64, threshold uint64, tolerance float64) bool {
return detectedSize > 0 && float64(detectedSize) <= float64(threshold)*(tolerance+1)
}
func TestMemtableFlushesIfIdle(t *testing.T) {
t.Run("an empty memtable is not flushed", func(t *testing.T) {
dirName := t.TempDir()
flushCallbacks := cyclemanager.NewCallbackGroup("flush", nullLogger(), 1)
flushCycle := cyclemanager.NewManager(cyclemanager.MemtableFlushCycleTicker(), flushCallbacks.CycleCallback)
flushCycle.Start()
bucket, err := NewBucket(testCtx(), dirName, "", nullLogger(), nil,
cyclemanager.NewCallbackGroupNoop(), flushCallbacks,
WithStrategy(StrategyReplace),
WithMemtableThreshold(1e12), // large enough to not affect this test
WithWalThreshold(1e12), // large enough to not affect this test
WithIdleThreshold(10*time.Millisecond),
)
require.Nil(t, err)
t.Run("assert no segments exist initially", func(t *testing.T) {
bucket.disk.maintenanceLock.RLock()
defer bucket.disk.maintenanceLock.RUnlock()
assert.Equal(t, 0, len(bucket.disk.segments))
})
t.Run("wait until idle threshold has passed", func(t *testing.T) {
// First flush attempt should occur after ~100ms after creating bucket.
// Buffer of 200ms guarantees, flush will be called during sleep period.
time.Sleep(200 * time.Millisecond)
})
t.Run("assert no segments exist even after passing the idle threshold", func(t *testing.T) {
bucket.disk.maintenanceLock.RLock()
defer bucket.disk.maintenanceLock.RUnlock()
assert.Equal(t, 0, len(bucket.disk.segments))
})
t.Run("shutdown bucket", func(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
require.Nil(t, bucket.Shutdown(ctx))
require.Nil(t, flushCycle.StopAndWait(ctx))
})
})
t.Run("a dirty memtable is flushed once the idle period is over", func(t *testing.T) {
dirName := t.TempDir()
flushCallbacks := cyclemanager.NewCallbackGroup("flush", nullLogger(), 1)
flushCycle := cyclemanager.NewManager(cyclemanager.MemtableFlushCycleTicker(), flushCallbacks.CycleCallback)
flushCycle.Start()
bucket, err := NewBucket(testCtx(), dirName, "", nullLogger(), nil,
cyclemanager.NewCallbackGroupNoop(), flushCallbacks,
WithStrategy(StrategyReplace),
WithMemtableThreshold(1e12), // large enough to not affect this test
WithWalThreshold(1e12), // large enough to not affect this test
WithIdleThreshold(50*time.Millisecond),
)
require.Nil(t, err)
t.Run("import something to make it dirty", func(t *testing.T) {
require.Nil(t, bucket.Put([]byte("some-key"), []byte("some-value")))
})
t.Run("assert no segments exist initially", func(t *testing.T) {
bucket.disk.maintenanceLock.RLock()
defer bucket.disk.maintenanceLock.RUnlock()
assert.Equal(t, 0, len(bucket.disk.segments))
})
t.Run("wait until idle threshold has passed", func(t *testing.T) {
// First flush attempt should occur after ~100ms after creating bucket.
// Buffer of 200ms guarantees, flush will be called during sleep period.
time.Sleep(200 * time.Millisecond)
})
t.Run("assert that a flush has occurred (and one segment exists)", func(t *testing.T) {
bucket.disk.maintenanceLock.RLock()
defer bucket.disk.maintenanceLock.RUnlock()
assert.Equal(t, 1, len(bucket.disk.segments))
})
t.Run("shutdown bucket", func(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
require.Nil(t, bucket.Shutdown(ctx))
require.Nil(t, flushCycle.StopAndWait(ctx))
})
})
t.Run("a dirty memtable is not flushed as long as the next write occurs before the idle threshold", func(t *testing.T) {
dirName := t.TempDir()
flushCallbacks := cyclemanager.NewCallbackGroup("flush", nullLogger(), 1)
flushCycle := cyclemanager.NewManager(cyclemanager.MemtableFlushCycleTicker(), flushCallbacks.CycleCallback)
flushCycle.Start()
bucket, err := NewBucket(testCtx(), dirName, "", nullLogger(), nil,
cyclemanager.NewCallbackGroupNoop(), flushCallbacks,
WithStrategy(StrategyReplace),
WithMemtableThreshold(1e12), // large enough to not affect this test
WithWalThreshold(1e12), // large enough to not affect this test
WithIdleThreshold(50*time.Millisecond),
)
require.Nil(t, err)
t.Run("import something to make it dirty", func(t *testing.T) {
require.Nil(t, bucket.Put([]byte("some-key"), []byte("some-value")))
})
t.Run("assert no segments exist initially", func(t *testing.T) {
bucket.disk.maintenanceLock.RLock()
defer bucket.disk.maintenanceLock.RUnlock()
assert.Equal(t, 0, len(bucket.disk.segments))
})
t.Run("keep importing without ever crossing the idle threshold", func(t *testing.T) {
rounds := 20
data := make([]byte, rounds*4)
_, err := rand.Read(data)
require.Nil(t, err)
for i := 0; i < rounds; i++ {
key := data[(i * 4) : (i+1)*4]
bucket.Put(key, []byte("value"))
time.Sleep(25 * time.Millisecond)
}
})
t.Run("assert that no flushing has occurred", func(t *testing.T) {
bucket.disk.maintenanceLock.RLock()
defer bucket.disk.maintenanceLock.RUnlock()
assert.Equal(t, 0, len(bucket.disk.segments))
})
t.Run("wait until idle threshold has passed", func(t *testing.T) {
// At that point 2 flush attempt have already occurred.
// 3rd attempt should occur after ~930ms after creating bucket.
// Buffer of 500ms guarantees, flush will be called during sleep period.
time.Sleep(500 * time.Millisecond)
})
t.Run("assert that a flush has occurred (and one segment exists)", func(t *testing.T) {
bucket.disk.maintenanceLock.RLock()
defer bucket.disk.maintenanceLock.RUnlock()
assert.Equal(t, 1, len(bucket.disk.segments))
})
t.Run("shutdown bucket", func(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
require.Nil(t, bucket.Shutdown(ctx))
require.Nil(t, flushCycle.StopAndWait(ctx))
})
})
}
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