Xushaohong commented on code in PR #643:
URL: https://github.com/apache/ratis/pull/643#discussion_r869187595
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ratis-server/src/main/java/org/apache/ratis/server/impl/SnapshotInstallationHandler.java:
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@@ -206,16 +209,16 @@ private InstallSnapshotReplyProto
notifyStateMachineToInstallSnapshot(
state.setLeader(leaderId, "installSnapshot");
server.updateLastRpcTime(FollowerState.UpdateType.INSTALL_SNAPSHOT_NOTIFICATION);
- if (inProgressInstallSnapshotIndex.compareAndSet(0,
firstAvailableLogIndex)) {
+ if (inProgressInstallSnapshotIndex.compareAndSet(INVALID_LOG_INDEX,
firstAvailableLogIndex)) {
LOG.info("{}: Received notification to install snapshot at index {}",
getMemberId(), firstAvailableLogIndex);
// Check if snapshot index is already at par or ahead of the first
// available log index of the Leader.
final long snapshotIndex = state.getLog().getSnapshotIndex();
- if (snapshotIndex + 1 >= firstAvailableLogIndex &&
firstAvailableLogIndex > 0) {
+ if (snapshotIndex >= firstAvailableLogIndex && firstAvailableLogIndex
> INVALID_LOG_INDEX) {
Review Comment:
> Do I understand correctly that `snapshotIndex` is the last index in a
snapshot that follower already installed, and `firstAvailableLogIndex` is the
first index available from leader that would be part of a new snapshot if
follower requested?
>
> If so, assume `snapshotIndex = 9` and `firstAvailableLogIndex = 10`. In
this case 9+1 >= 10, hence follower responds with `ALREADY_INSTALLED`. Does
that seem right?
I think so. Hope @szetszwo help confirm it
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