CODEWITHSUNDEEP
hadoophbase
AKC
AKC

Reputation: 1023

Hbase: How to know if a row had particular column family or not?

Let's assue that rowkey 1 has values for f1:c1, f1:c2 Where as rowkey 2 has values for f1:c1 only. row 2 doesn't have f1:c2.

How do i recognize such rows(the ones without column populated)?

Upvotes: 1

Views: 74

Answers (1)

Ram Ghadiyaram
Ram Ghadiyaram

Reputation: 29155

  • You want to know from row then try like this...

     HTable t = new HTable(conf....);
 ResultScanner scanner = t.getScanner(new Scan());    
 for (Result rr = scanner.next(); rr != null; rr = scanner.next()) 
 {
       if (rr.getValue("YourFamily" , "YourQualifier").equals(Bytes.toBytes("d"))
       {
        // do some thing
       } else { return; // if you want to skip     } } }

  • See Result

result.getFamilyMap() is one more way. But its not recommended due to performance.. see the doc of this method

However, HTableDescriptor.html has already hasfamily method.

boolean hasFamily(byte[] familyName)
Checks to see if this table contains the given column family

Upvotes: 1

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