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From Aditya Narayan <>
Subject Concatenating ids with extension to keep multiple rows related to an entity in a single CF
Date Thu, 03 Nov 2011 20:48:26 GMT
I am concatenating  two Integer ids through bitwise operations(as described
below) to create a single primary key of type long. I wanted to know if
this is a good practice. This would help me in keeping multiple rows of an
entity in a single column family by appending different extensions to the
Are there better ways ? My Ids are of type Integer(4 bytes).

    public static final long makeCompositeKey(int k1, int k2){
        return (long)k1 << 32 | k2;

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