[jira] [Created] (RATIS-2134) `logMetadata` could append wrong `commitIndex` in the `metadataEntry`

["Chung En Lee (Jira)" <ji...@apache.org>]

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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