Chung En Lee created RATIS-2134:
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Summary: `logMetadata` could append wrong `commitIndex` in the
`metadataEntry`
Key: RATIS-2134
URL: https://issues.apache.org/jira/browse/RATIS-2134
Project: Ratis
Issue Type: Bug
Reporter: Chung En Lee
Assignee: Chung En Lee
Now, RaftLog appends a metadata entry with the lastCommitIndex and checks
whether the entry at the lastCommitIndex is neither a metadata entry nor an
entry with a smaller commit index.
However, RaftLog doesn't always log metadata entries in order. Sometimes, it
misses some commit indexes. For example:
STATEMACHINELOGENTRY(1, 1)
STATEMACHINELOGENTRY(1, 2)
METADATAENTRY(commitIndex: 1)
If a {{METADATAENTRY}} is missed and the lastCommitIndex is a metadata entry,
RaftLog won't append it.
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