bookkeeper-server/src/main/java/org/apache/bookkeeper/util/collections/ConcurrentOpenHashMap.java [147:168]:
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    public ConcurrentOpenHashMap(int expectedItems, int concurrencyLevel,
                                 float mapFillFactor, float mapIdleFactor,
                                 boolean autoShrink, float expandFactor, float shrinkFactor) {
        checkArgument(expectedItems > 0);
        checkArgument(concurrencyLevel > 0);
        checkArgument(expectedItems >= concurrencyLevel);
        checkArgument(mapFillFactor > 0 && mapFillFactor < 1);
        checkArgument(mapIdleFactor > 0 && mapIdleFactor < 1);
        checkArgument(mapFillFactor > mapIdleFactor);
        checkArgument(expandFactor > 1);
        checkArgument(shrinkFactor > 1);

        int numSections = concurrencyLevel;
        int perSectionExpectedItems = expectedItems / numSections;
        int perSectionCapacity = (int) (perSectionExpectedItems / mapFillFactor);
        this.sections = (Section<K, V>[]) new Section[numSections];

        for (int i = 0; i < numSections; i++) {
            sections[i] = new Section<>(perSectionCapacity, mapFillFactor, mapIdleFactor,
                    autoShrink, expandFactor, shrinkFactor);
        }
    }
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bookkeeper-server/src/main/java/org/apache/bookkeeper/util/collections/ConcurrentLongHashMap.java [158:179]:
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    public ConcurrentLongHashMap(int expectedItems, int concurrencyLevel,
                                 float mapFillFactor, float mapIdleFactor,
                                 boolean autoShrink, float expandFactor, float shrinkFactor) {
        checkArgument(expectedItems > 0);
        checkArgument(concurrencyLevel > 0);
        checkArgument(expectedItems >= concurrencyLevel);
        checkArgument(mapFillFactor > 0 && mapFillFactor < 1);
        checkArgument(mapIdleFactor > 0 && mapIdleFactor < 1);
        checkArgument(mapFillFactor > mapIdleFactor);
        checkArgument(expandFactor > 1);
        checkArgument(shrinkFactor > 1);

        int numSections = concurrencyLevel;
        int perSectionExpectedItems = expectedItems / numSections;
        int perSectionCapacity = (int) (perSectionExpectedItems / mapFillFactor);
        this.sections = (Section<V>[]) new Section[numSections];

        for (int i = 0; i < numSections; i++) {
            sections[i] = new Section<>(perSectionCapacity, mapFillFactor, mapIdleFactor,
                    autoShrink, expandFactor, shrinkFactor);
        }
    }
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