Cassandra not value inserted -

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I am using cassandra.my column testcassa and column is test1. I tried to insert the value like < Strong> set testcassa ['123'] [test1] = 'sample' but it gives 'blank'. And no error message .. someone can help me ..

Thanks in advance. 

  [default @ unknown] create keys mykeyspace; [Default @ unknown] use mykeyspace; [Default @mikespace] set CF1 [1] ['C2'] = UTF8 ('test'); [Default @micyspace] get CF1 [1]; [Default @micyspace] set CF1 [1] ['C2'] = UTF8 ('Test2'); [Default @micyspace] del cf1 [1];

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