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f89b06dc6d
The suggested pattern for Raft proposals is that they be retried periodically until they succeed. This turns out to be an issue when a leader cannot commit entries because the leader will continue to append re-proposed entries to its log without committing anything. This can result in the uncommitted tail of a leader's log growing without bound until it is able to commit entries. This change add a safeguard to protect against this case where a leader's log can grow without bound during loss of quorum scenarios. It does so by introducing a new, optional ``MaxUncommittedEntriesSize configuration. This config limits the max aggregate size of uncommitted entries that may be appended to a leader's log. Once this limit is exceeded, proposals will begin to return ErrProposalDropped errors. See cockroachdb/cockroach#27772
Contrib
Scripts and files which may be useful but aren't part of the core etcd project.
- systemd - an example unit file for deploying etcd on systemd-based distributions
- raftexample - an example distributed key-value store using raft
- systemd/etcd2-backup-coreos - remote backup and restore procedures for etcd2 clusters on CoreOS Linux
- systemd/etcd3-multinode - multi-node cluster setup with systemd