To start the Ruby debugger, you execute which of the following commands?
A. ruby -i debug
B. ruby -e debug
C. ruby -x debug
D. ruby -r debug
Answer: D
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In a decentralized variant of the two-phase commit protocol the participants communicate directly with one another instead of indirectly via the coordinator. In Phase 1, the coordinator sends its vote to all the participants. In Phase 2, if the coordinator's vote is No, the participants just abort the transaction; if it is Yes, each participant sends its vote to the coordinator and the other participants, each of which decides on the outcome according to the vote and carries it out. Calculate the number of messages and the number of rounds it takes. What are its advantages or disadvantages in comparison with the centralized variant?
What will be an ideal response?
When you paint the image with a _____ foreground, the size of the mask increases, and each brush stroke hides pixels on the image layer.
A. white B. black C. gray D. clear