Answer Happy

Question is related to Big Data system, pls dont answerif its not relevent to the subject
This is a subjective question, hence you have to write your answer in the Text-Field given below. Figur 308 Figures (a) and (b) show two independent sequences of reads and writes for data items in a distributed DB across various nodes P1, P2, P3, P4 on a timeline "R: X-V" at Pi means read operation on data item X returns value V at node Pi and "W: Y=V" at Pj means data item Y is written with value V by node Pj. In each case, evaluate if the sequence satisfies or violates causal consistency ? Give reasons for your answer. [4 Marks] P1 P2 P3 P4 W: X=1 W: Y-6 R: X=2 R: X-1 time (a) R: Y=6 P1 P2 P3 P4 W: X-1 W: X-6 R: Y-2 R: X-6 W: Y=4 R: X=6 time (b) R: Y-4 R: X-1