Xushaohong commented on PR #643:
URL: https://github.com/apache/ratis/pull/643#issuecomment-1121875913
As SCM uses bootstrap to set up HA, it goes through this branch.
```
if (isFollowerBootstrapping && !follower.hasAttemptedToInstallSnapshot()) {
// If the follower is bootstrapping and has not yet installed any
snapshot from leader, then the follower should
// be notified to install a snapshot. Every follower should try to
install at least one snapshot during
// bootstrapping, if available.
LOG.debug("{}: follower is bootstrapping, notify to install snapshot
to {}.", this, firstAvailable);
return firstAvailable;
}
```
Meanwhile, the leader is also newly started, which has not truncated the
raft log yet. The `firstAvailable` will be 0 here.
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