猫熊小才天の书院

public byte[] buildRowKey(ValueGetter valueGetter, ImmutableBytesWritable rowKeyPtr, byte[] regionStartKey, byte[] regionEndKey, long ts)  {
    ImmutableBytesWritable ptr = new ImmutableBytesWritable();

//判断是否是构建本地索引，考虑两个条件：1.本地索引是否开启 2.startRK 是否传进来了
    boolean prependRegionStartKey = isLocalIndex && regionStartKey != null;
    boolean isIndexSalted = !isLocalIndex && nIndexSaltBuckets > 0;

//如果开启本地索引，则在数据前面添加前缀，判断startRK是否是region起始startRK，如果是则使用该region的EndRK
    int prefixKeyLength =
            prependRegionStartKey ? (regionStartKey.length != 0 ? regionStartKey.length
                    : regionEndKey.length) : 0;
    TrustedByteArrayOutputStream stream = new TrustedByteArrayOutputStream(estimatedIndexRowKeyBytes + (prependRegionStartKey ? prefixKeyLength : 0));

// 构建数据流对象，对数据进行put
    DataOutput output = new DataOutputStream(stream);