fluss-common/src/main/java/com/alibaba/fluss/record/KvRecordBatchBuilder.java [145:171]:
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    public long writerId() {
        return writerId;
    }

    public int batchSequence() {
        return batchSequence;
    }

    public boolean isClosed() {
        return isClosed;
    }

    @Override
    public void close() throws IOException {
        isClosed = true;
    }

    public int getSizeInBytes() {
        return sizeInBytes;
    }

    // ----------------------- internal methods -------------------------------
    private void writeBatchHeader() throws IOException {
        // pagedOutputView doesn't support seek to previous segment,
        // so we create a new output view on the first segment
        MemorySegmentOutputView outputView = new MemorySegmentOutputView(firstSegment);
        outputView.setPosition(0);
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fluss-common/src/main/java/com/alibaba/fluss/record/MemoryLogRecordsIndexedBuilder.java [168:194]:
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    public long writerId() {
        return writerId;
    }

    public int batchSequence() {
        return batchSequence;
    }

    public boolean isClosed() {
        return isClosed;
    }

    @Override
    public void close() throws IOException {
        isClosed = true;
    }

    public int getSizeInBytes() {
        return sizeInBytes;
    }

    // ----------------------- internal methods -------------------------------
    private void writeBatchHeader() throws IOException {
        // pagedOutputView doesn't support seek to previous segment,
        // so we create a new output view on the first segment
        MemorySegmentOutputView outputView = new MemorySegmentOutputView(firstSegment);
        outputView.setPosition(0);
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