mirror of
https://github.com/luxfi/zapdb.git
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94 lines
2.9 KiB
Go
94 lines
2.9 KiB
Go
/*
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* SPDX-FileCopyrightText: © 2017-2025 Istari Digital, Inc.
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* SPDX-License-Identifier: Apache-2.0
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*/
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package badger
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import (
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestBuildKeyValueSizeHistogram(t *testing.T) {
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t.Run("All same size key-values", func(t *testing.T) {
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runBadgerTest(t, nil, func(t *testing.T, db *DB) {
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entries := int64(40)
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err := db.Update(func(txn *Txn) error {
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for i := rune(0); i < rune(entries); i++ {
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err := txn.SetEntry(NewEntry([]byte(string(i)), []byte("B")))
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if err != nil {
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return err
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}
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}
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return nil
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})
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require.NoError(t, err)
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histogram := db.buildHistogram(nil)
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keyHistogram := histogram.keySizeHistogram
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valueHistogram := histogram.valueSizeHistogram
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require.Equal(t, entries, keyHistogram.totalCount)
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require.Equal(t, entries, valueHistogram.totalCount)
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// Each entry is of size one. So the sum of sizes should be the same
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// as number of entries
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require.Equal(t, entries, valueHistogram.sum)
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require.Equal(t, entries, keyHistogram.sum)
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// All value sizes are same. The first bin should have all the values.
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require.Equal(t, entries, valueHistogram.countPerBin[0])
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require.Equal(t, entries, keyHistogram.countPerBin[0])
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require.Equal(t, int64(1), keyHistogram.max)
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require.Equal(t, int64(1), keyHistogram.min)
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require.Equal(t, int64(1), valueHistogram.max)
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require.Equal(t, int64(1), valueHistogram.min)
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})
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})
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t.Run("different size key-values", func(t *testing.T) {
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runBadgerTest(t, nil, func(t *testing.T, db *DB) {
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entries := int64(3)
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err := db.Update(func(txn *Txn) error {
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if err := txn.SetEntry(NewEntry([]byte("A"), []byte("B"))); err != nil {
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return err
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}
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if err := txn.SetEntry(NewEntry([]byte("AA"), []byte("BB"))); err != nil {
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return err
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}
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return txn.SetEntry(NewEntry([]byte("AAA"), []byte("BBB")))
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})
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require.NoError(t, err)
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histogram := db.buildHistogram(nil)
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keyHistogram := histogram.keySizeHistogram
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valueHistogram := histogram.valueSizeHistogram
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require.Equal(t, entries, keyHistogram.totalCount)
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require.Equal(t, entries, valueHistogram.totalCount)
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// Each entry is of size one. So the sum of sizes should be the same
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// as number of entries
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require.Equal(t, int64(6), valueHistogram.sum)
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require.Equal(t, int64(6), keyHistogram.sum)
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// Length 1 key is in first bucket, length 2 and 3 are in the second
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// bucket
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require.Equal(t, int64(1), valueHistogram.countPerBin[0])
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require.Equal(t, int64(2), valueHistogram.countPerBin[1])
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require.Equal(t, int64(1), keyHistogram.countPerBin[0])
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require.Equal(t, int64(2), keyHistogram.countPerBin[1])
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require.Equal(t, int64(3), keyHistogram.max)
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require.Equal(t, int64(1), keyHistogram.min)
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require.Equal(t, int64(3), valueHistogram.max)
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require.Equal(t, int64(1), valueHistogram.min)
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})
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})
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}
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