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From "121476721@qq.com" <121476...@qq.com>
Subject a misunderstanding of ZAB
Date Mon, 02 Sep 2019 02:49:42 GMT
hi, i'm a new to zookeeper, and this problem confuses me for nearly two months...
papers tell me that zab must satisfy:
A message delivered by one sever must be delivered on quorum.
A message skipped must always be skipped.
Then consider two cases below, L is short for leader, F is short for follower, p is short
for proposal.
Case1:
L send p1 to F2 F3 F4 F5.
F2 F3 ack p1, reach a quorum.
L1 is about to send commit but failed...
L2 become new leader, he should commit.

Case2:
L1 send p1 to F2 F3 F4 F5.
Only F2 ack p1, not reach a quorum.
Then L1 failed...
L2 become new leader, he should skip p1.

i think L2 should handle the cases in election&recovery phase. but how L2 can know the
global state and decide if commit p1 or skip p1?
if anyone helps, i will be much appreciate.



121476721@qq.com
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