Hanisha Koneru created RATIS-874:
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Summary: Fix AppendEntry validity checks to take the SnapshotIndex
into account
Key: RATIS-874
URL: https://issues.apache.org/jira/browse/RATIS-874
Project: Ratis
Issue Type: Bug
Reporter: Hanisha Koneru
Assignee: Hanisha Koneru
This Jira aims to fix the following:
# Before sending an appendEntry request to follower, leader checks the validity
of the request be verifying if the follower has the previous log entry. But if
the follower had installed a snapshot, the previous could be missing and the
appendEntry would still be valid. Hence, the SnapshotIndex should be factored
in while checking the validity of appendEntry request. Leader should store
Follower's SnapshotIndex for this.
# When follower receives appendEntry request, it checks the validity of log
entry - the first index of the log entry is exactly 1 more than the last log
index. During this check, the snapshotIndex should also be considered i.e. the
first index of the log entry can be 1 more than the last log index or the
snapshotIndex.
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