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[ISSUE #144] node abnormal status detection and recovery #145

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[ISSUE #144] node abnormal status detection and recovery #145

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Fix #144

  • Records the current term of each node when the master node sends a heartbeat to the slave node.
  • Check whether the term of each node is normal when the master node sends a heartbeat and keeps the master node state normally.
  • Send a status check heartbeat to the slave node when the term of the slave node is greater than that of the master node.
  • When the slave node receives the status detection heartbeat, check whether it is CANDIDATE and its term is greater than that of the master node, and recovery to FOLLOWER when this scenario is met.

@Git-Yang
[ISSUE openmessaging#144] node abnormal status detection and recovery
1105619 
Signed-off-by: zhangyang21 <zhangyang21@xiaomi.com>
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Node abnormal status detection and recovery
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