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rafttest: reduce waitLeader flakiness #195
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There are a few tests requiring a stable leader. For example, TestBasicProgress waits for a leader, submits 100 proposals, and expects that all 100 proposals are committed. In rare cases, a leader is elected, and the test proceeds, but in the meantime another node campaigns and wins a higher-term election. After this, some proposals end up not committed (legitimately), and the test fails. This commit modifies the waitLeader function with a better heuristic for a stable leader. It now waits until the leader has the highest term in the cluster, which more reliably (although not 100%) guarantees that there is no in-flight campaign that is about to win. Signed-off-by: Pavel Kalinnikov <[email protected]>
Example log of a === RUN TestBasicProgress
23:05:24 INFO: 1 switched to configuration voters=()
23:05:24 INFO: 1 became follower at term 0
23:05:24 INFO: newRaft 1 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
23:05:24 INFO: 1 became follower at term 1
23:05:24 INFO: 1 switched to configuration voters=(1)
23:05:24 INFO: 1 switched to configuration voters=(1 2)
23:05:24 INFO: 1 switched to configuration voters=(1 2 3)
23:05:24 INFO: 1 switched to configuration voters=(1 2 3 4)
23:05:24 INFO: 1 switched to configuration voters=(1 2 3 4 5)
23:05:24 INFO: 2 switched to configuration voters=()
23:05:24 INFO: 2 became follower at term 0
23:05:24 INFO: newRaft 2 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
23:05:24 INFO: 2 became follower at term 1
23:05:24 INFO: 2 switched to configuration voters=(1)
23:05:24 INFO: 2 switched to configuration voters=(1 2)
23:05:24 INFO: 2 switched to configuration voters=(1 2 3)
23:05:24 INFO: 2 switched to configuration voters=(1 2 3 4)
23:05:24 INFO: 2 switched to configuration voters=(1 2 3 4 5)
23:05:24 INFO: 3 switched to configuration voters=()
23:05:24 INFO: 3 became follower at term 0
23:05:24 INFO: newRaft 3 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
23:05:24 INFO: 3 became follower at term 1
23:05:24 INFO: 3 switched to configuration voters=(1)
23:05:24 INFO: 3 switched to configuration voters=(1 2)
23:05:24 INFO: 3 switched to configuration voters=(1 2 3)
23:05:24 INFO: 3 switched to configuration voters=(1 2 3 4)
23:05:24 INFO: 3 switched to configuration voters=(1 2 3 4 5)
23:05:24 INFO: 4 switched to configuration voters=()
23:05:24 INFO: 4 became follower at term 0
23:05:24 INFO: newRaft 4 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
23:05:24 INFO: 4 became follower at term 1
23:05:24 INFO: 4 switched to configuration voters=(1)
23:05:24 INFO: 4 switched to configuration voters=(1 2)
23:05:24 INFO: 4 switched to configuration voters=(1 2 3)
23:05:24 INFO: 4 switched to configuration voters=(1 2 3 4)
23:05:24 INFO: 4 switched to configuration voters=(1 2 3 4 5)
23:05:24 INFO: 5 switched to configuration voters=()
23:05:24 INFO: 5 became follower at term 0
23:05:24 INFO: newRaft 5 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
23:05:24 INFO: 5 became follower at term 1
23:05:24 INFO: 5 switched to configuration voters=(1)
23:05:24 INFO: 5 switched to configuration voters=(1 2)
23:05:24 INFO: 5 switched to configuration voters=(1 2 3)
23:05:24 INFO: 5 switched to configuration voters=(1 2 3 4)
23:05:24 INFO: 5 switched to configuration voters=(1 2 3 4 5)
23:05:24 INFO: 3 is starting a new election at term 1
23:05:24 INFO: 3 became candidate at term 2
23:05:24 INFO: 3 [logterm: 1, index: 5] sent MsgVote request to 1 at term 2
23:05:24 INFO: 3 [logterm: 1, index: 5] sent MsgVote request to 2 at term 2
23:05:24 INFO: 3 [logterm: 1, index: 5] sent MsgVote request to 4 at term 2
23:05:24 INFO: 3 [logterm: 1, index: 5] sent MsgVote request to 5 at term 2
23:05:24 INFO: 3 received MsgVoteResp from 3 at term 2
23:05:24 INFO: 3 has received 1 MsgVoteResp votes and 0 vote rejections
23:05:24 INFO: 4 [term: 1] received a MsgVote message with higher term from 3 [term: 2]
23:05:24 INFO: 4 became follower at term 2
23:05:24 INFO: 4 [logterm: 1, index: 5, vote: 0] cast MsgVote for 3 [logterm: 1, index: 5] at term 2
23:05:24 INFO: 1 [term: 1] received a MsgVote message with higher term from 3 [term: 2]
23:05:24 INFO: 1 became follower at term 2
23:05:24 INFO: 1 [logterm: 1, index: 5, vote: 0] cast MsgVote for 3 [logterm: 1, index: 5] at term 2
23:05:24 INFO: 5 is starting a new election at term 1
23:05:24 INFO: 5 became candidate at term 2
23:05:24 INFO: 5 [logterm: 1, index: 5] sent MsgVote request to 1 at term 2
23:05:24 INFO: 5 [logterm: 1, index: 5] sent MsgVote request to 2 at term 2
23:05:24 INFO: 5 [logterm: 1, index: 5] sent MsgVote request to 3 at term 2
23:05:24 INFO: 5 [logterm: 1, index: 5] sent MsgVote request to 4 at term 2
23:05:24 INFO: 5 received MsgVoteResp from 5 at term 2
23:05:24 INFO: 5 has received 1 MsgVoteResp votes and 0 vote rejections
23:05:24 INFO: 5 [logterm: 1, index: 5, vote: 5] rejected MsgVote from 3 [logterm: 1, index: 5] at term 2
23:05:24 INFO: 3 received MsgVoteResp from 4 at term 2
23:05:24 INFO: 3 has received 2 MsgVoteResp votes and 0 vote rejections
23:05:24 INFO: 3 [logterm: 1, index: 5, vote: 3] rejected MsgVote from 5 [logterm: 1, index: 5] at term 2
23:05:24 INFO: 1 [logterm: 1, index: 5, vote: 3] rejected MsgVote from 5 [logterm: 1, index: 5] at term 2
23:05:24 INFO: 3 received MsgVoteResp from 1 at term 2
23:05:24 INFO: 3 has received 3 MsgVoteResp votes and 0 vote rejections
23:05:24 INFO: 3 became leader at term 2
23:05:24 INFO: raft.node: 3 elected leader 3 at term 2
23:05:24 INFO: 5 received MsgVoteResp rejection from 3 at term 2
23:05:24 INFO: 5 has received 1 MsgVoteResp votes and 1 vote rejections
23:05:24 INFO: 4 [logterm: 1, index: 5, vote: 3] rejected MsgVote from 5 [logterm: 1, index: 5] at term 2
23:05:24 INFO: raft.node: 4 elected leader 3 at term 2
23:05:24 INFO: 5 became follower at term 2
23:05:24 INFO: raft.node: 5 elected leader 3 at term 2
23:05:24 INFO: raft.node: 1 elected leader 3 at term 2
23:05:25 INFO: 2 [term: 1] received a MsgVote message with higher term from 3 [term: 2]
23:05:25 INFO: 2 became follower at term 2
23:05:25 INFO: 2 [logterm: 1, index: 5, vote: 0] cast MsgVote for 3 [logterm: 1, index: 5] at term 2
23:05:25 INFO: 2 [logterm: 1, index: 5, vote: 3] rejected MsgVote from 5 [logterm: 1, index: 5] at term 2
23:05:25 INFO: raft.node: 2 elected leader 3 at term 2
23:05:25 INFO: 2 is starting a new election at term 2
23:05:25 INFO: 2 became candidate at term 3
23:05:25 INFO: 2 [logterm: 2, index: 6] sent MsgVote request to 1 at term 3
23:05:25 INFO: 2 [logterm: 2, index: 6] sent MsgVote request to 3 at term 3
23:05:25 INFO: 2 [logterm: 2, index: 6] sent MsgVote request to 4 at term 3
23:05:25 INFO: 2 [logterm: 2, index: 6] sent MsgVote request to 5 at term 3
23:05:25 INFO: raft.node: 2 lost leader 3 at term 3
23:05:25 INFO: 2 received MsgVoteResp from 2 at term 3
23:05:25 INFO: 2 has received 1 MsgVoteResp votes and 0 vote rejections
23:05:25 INFO: 2 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 2] received a MsgVote message with higher term from 2 [term: 3]
23:05:25 INFO: 5 became follower at term 3
23:05:25 INFO: 5 [logterm: 2, index: 6, vote: 0] cast MsgVote for 2 [logterm: 2, index: 6] at term 3
23:05:25 INFO: raft.node: 5 lost leader 3 at term 3
23:05:25 INFO: 2 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgVoteResp message with lower term from 2 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 2] received a MsgVote message with higher term from 2 [term: 3]
23:05:25 INFO: 3 became follower at term 3
23:05:25 INFO: 3 [logterm: 2, index: 78, vote: 0] rejected MsgVote from 2 [logterm: 2, index: 6] at term 3
23:05:25 INFO: raft.node: 3 lost leader 3 at term 3
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 2] received a MsgVote message with higher term from 2 [term: 3]
23:05:25 INFO: 4 became follower at term 3
23:05:25 INFO: 4 [logterm: 2, index: 6, vote: 0] cast MsgVote for 2 [logterm: 2, index: 6] at term 3
23:05:25 INFO: raft.node: 4 lost leader 3 at term 3
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored entry appends from a MsgStorageAppendResp message with lower term [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 4 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 4 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 4 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 2] received a MsgVote message with higher term from 2 [term: 3]
23:05:25 INFO: 1 became follower at term 3
23:05:25 INFO: 1 [logterm: 2, index: 7, vote: 0] rejected MsgVote from 2 [logterm: 2, index: 6] at term 3
23:05:25 INFO: raft.node: 1 lost leader 3 at term 3
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 2 received MsgVoteResp from 5 at term 3
23:05:25 INFO: 2 has received 2 MsgVoteResp votes and 0 vote rejections
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 4 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 4 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgHeartbeatResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 4 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 4 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 4 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 received MsgVoteResp from 4 at term 3
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 has received 3 MsgVoteResp votes and 0 vote rejections
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 became leader at term 3
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: raft.node: 2 elected leader 2 at term 3
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 5 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 4 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 2 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgApp message with lower term from 3 [term: 2]
23:05:25 INFO: 1 [term: 3] ignored a MsgHeartbeat message with lower term from 3 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 4 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgHeartbeatResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: 3 [term: 3] ignored a MsgAppResp message with lower term from 1 [term: 2]
23:05:25 INFO: raft.node: 1 elected leader 2 at term 3
23:05:25 INFO: raft.node: 5 elected leader 2 at term 3
23:05:25 INFO: found conflict at index 7 [existing term: 2, conflicting term: 3]
23:05:25 INFO: replace the unstable entries from index 7
23:05:25 INFO: raft.node: 4 elected leader 2 at term 3
23:05:25 INFO: found conflict at index 7 [existing term: 2, conflicting term: 3]
23:05:25 INFO: replace the unstable entries from index 7
23:05:25 INFO: raft.node: 3 elected leader 2 at term 3
node_test.go:47: commits failed to converge!
23:05:30 raft.1: stop
23:05:30 raft.2: stop
23:05:30 raft.3: stop
23:05:30 raft.4: stop
23:05:30 raft.5: stop
23:05:30 INFO: 1 switched to configuration voters=()
23:05:30 INFO: 1 became follower at term 0
23:05:30 INFO: newRaft 1 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
23:05:30 INFO: 1 became follower at term 1
23:05:30 INFO: 1 switched to configuration voters=(1)
23:05:30 INFO: 1 switched to configuration voters=(1 2)
23:05:30 INFO: 1 switched to configuration voters=(1 2 3)
23:05:30 INFO: 1 switched to configuration voters=(1 2 3 4)
23:05:30 INFO: 1 switched to configuration voters=(1 2 3 4 5)
23:05:30 INFO: 2 switched to configuration voters=()
23:05:30 INFO: 2 became follower at term 0
23:05:30 INFO: newRaft 2 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
23:05:30 INFO: 2 became follower at term 1
23:05:30 INFO: 2 switched to configuration voters=(1)
23:05:30 INFO: 2 switched to configuration voters=(1 2)
23:05:30 INFO: 2 switched to configuration voters=(1 2 3)
23:05:30 INFO: 2 switched to configuration voters=(1 2 3 4)
23:05:30 INFO: 2 switched to configuration voters=(1 2 3 4 5)
23:05:30 INFO: 3 switched to configuration voters=()
23:05:30 INFO: 3 became follower at term 0
23:05:30 INFO: newRaft 3 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
23:05:30 INFO: 3 became follower at term 1
23:05:30 INFO: 3 switched to configuration voters=(1)
23:05:30 INFO: 3 switched to configuration voters=(1 2)
23:05:30 INFO: 3 switched to configuration voters=(1 2 3)
23:05:30 INFO: 3 switched to configuration voters=(1 2 3 4)
23:05:30 INFO: 3 switched to configuration voters=(1 2 3 4 5)
23:05:30 INFO: 4 switched to configuration voters=()
23:05:30 INFO: 4 became follower at term 0
23:05:30 INFO: newRaft 4 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
23:05:30 INFO: 4 became follower at term 1
23:05:30 INFO: 4 switched to configuration voters=(1)
23:05:30 INFO: 4 switched to configuration voters=(1 2)
23:05:30 INFO: 4 switched to configuration voters=(1 2 3)
23:05:30 INFO: 4 switched to configuration voters=(1 2 3 4)
23:05:30 INFO: 4 switched to configuration voters=(1 2 3 4 5)
23:05:30 INFO: 5 switched to configuration voters=()
23:05:30 INFO: 5 became follower at term 0
23:05:30 INFO: newRaft 5 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
23:05:30 INFO: 5 became follower at term 1
23:05:30 INFO: 5 switched to configuration voters=(1)
23:05:30 INFO: 5 switched to configuration voters=(1 2)
23:05:30 INFO: 5 switched to configuration voters=(1 2 3)
23:05:30 INFO: 5 switched to configuration voters=(1 2 3 4)
23:05:30 INFO: 5 switched to configuration voters=(1 2 3 4 5)
--- FAIL: TestBasicProgress (5.25s) |
One unclear bit in this log, though, is: 23:05:25 INFO: 2 [term: 1] received a MsgVote message with higher term from 3 [term: 2]
23:05:25 INFO: 2 became follower at term 2
23:05:25 INFO: 2 [logterm: 1, index: 5, vote: 0] cast MsgVote for 3 [logterm: 1, index: 5] at term 2
23:05:25 INFO: 2 [logterm: 1, index: 5, vote: 3] rejected MsgVote from 5 [logterm: 1, index: 5] at term 2
23:05:25 INFO: raft.node: 2 elected leader 3 at term 2
23:05:25 INFO: 2 is starting a new election at term 2
23:05:25 INFO: 2 became candidate at term 3
23:05:25 INFO: 2 [logterm: 2, index: 6] sent MsgVote request to 1 at term 3
23:05:25 INFO: 2 [logterm: 2, index: 6] sent MsgVote request to 3 at term 3
23:05:25 INFO: 2 [logterm: 2, index: 6] sent MsgVote request to 4 at term 3
23:05:25 INFO: 2 [logterm: 2, index: 6] sent MsgVote request to 5 at term 3 Specifically, the node 2 has voted for node 3 @ term 2, and immediately went to the candidate state for term 3, even though it had no reason to do so. |
My immediate guess is that it was just a very bad timing of messages:
OTOH, I don't see any code path in this test that would call this
The second scenario shouldn't be possible though, because we do reset the timeout after voting. |
So, the last hypothesis is that the 5ms ticks are too small, and the election timeout could have simply fired in short succession after the vote. For example, there was a slight Go runtime scheduling delay, and there has been a more than 10x5ms stall, which eventually caused the campaign. |
@@ -35,7 +35,7 @@ func TestBasicProgress(t *testing.T) { | |||
nodes = append(nodes, n) | |||
} | |||
|
|||
waitLeader(nodes) | |||
waitStableLeader(nodes) |
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Maybe a better fix for this test, specifically, would be to relax the expectation in line 44 that all 100 entries are committed. In fact, we don't have any guarantee that any entry is going to be committed. If the leader election is completely unstable, and every single submitted entry that gets routed to a now-leader ends up wiped because there is already a higher-term leader, we won't commit anything.
We can require in this test, however, that most entries are committed (say, at least 70 out of 100), to demonstrate that there is liveness in this implementation.
Alternatively, once we have a leader, we can stop ticking the nodes, so that no re-election will occur and disrupt the 100 entries flow.
I think there are two possible reasons:
It isn't correct to expect all nodes have all the 100 entries committed. The correct expectation should be that,
Also it seems the PreVote isn't enabled in the test. I think it would be better,
|
There are a few tests requiring a stable leader. For example,
TestBasicProgress
waits for a leader, submits 100 proposals, and expects that all 100 proposals are committed. In rare cases, a leader is elected, and the test proceeds, but in the meantime another node campaigns and wins a higher-term election. After this, some proposals end up not committed (legitimately), and the test fails.This commit modifies the
waitLeader
function with a better heuristic for a stable leader. It now waits until the leader has the highest term in the cluster, which more reliably (although not 100%) guarantees that there is no in-flight campaign that is about to win.