etcd 3.3.9 发布，高可用 Key/Value 存储系统

etcd 3.3.9 已发布，etcd 是一个高可用的 Key/Value 存储系统，主要用于分享配置和服务发现，灵感来自于 ZooKeeper 和 Doozer。更新内容如下：

Improved

• Improve Raft Read Index timeout warning messages.

Security, Authentication

• Compile with Go 1.10.3 to support crypto/x509 "Name Constraints".

Metrics, Monitoring

Note that any etcd_debugging_* metrics are experimental and subject to change.

• Add etcd_server_go_version Prometheus metric.

• Add etcd_server_heartbeat_send_failures_total Prometheus metric.

• Add etcd_server_slow_apply_total Prometheus metric.

• Add etcd_disk_backend_defrag_duration_seconds Prometheus metric.

• Add etcd_mvcc_hash_duration_seconds Prometheus metric.

• Add etcd_mvcc_hash_rev_duration_seconds Prometheus metric.

• Add etcd_server_slow_read_indexes_total Prometheus metric.

• Add etcd_server_quota_backend_bytes Prometheus metric.

• Use it with etcd_mvcc_db_total_size_in_bytes and etcd_mvcc_db_total_size_in_use_in_bytes.

• etcd_server_quota_backend_bytes 2.147483648e+09 means current quota size is 2 GB.

• etcd_mvcc_db_total_size_in_bytes 20480 means current physically allocated DB size is 20 KB.

• etcd_mvcc_db_total_size_in_use_in_bytes 16384 means future DB size if defragment operation is complete.

• etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes is the number of bytes that can be saved on disk with defragment operation.

• Add etcd_mvcc_db_total_size_in_bytes Prometheus metric.

• In addition to etcd_debugging_mvcc_db_total_size_in_bytes.

• Add etcd_mvcc_db_total_size_in_use_in_bytes Prometheus metric.

• Use it with etcd_mvcc_db_total_size_in_bytes and etcd_mvcc_db_total_size_in_use_in_bytes.

• etcd_server_quota_backend_bytes 2.147483648e+09 means current quota size is 2 GB.

• etcd_mvcc_db_total_size_in_bytes 20480 means current physically allocated DB size is 20 KB.

• etcd_mvcc_db_total_size_in_use_in_bytes 16384 means future DB size if defragment operation is complete.

• etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes is the number of bytes that can be saved on disk with defragment operation.

client v3

• Fix lease keepalive interval updates when response queue is full.

• If <-chan *clientv3LeaseKeepAliveResponse from clientv3.Lease.KeepAlive was never consumed or channel is full, client was sending keepalive request every 500ms instead of expected rate of every "TTL / 3" duration.

Go

• Compile with Go 1.10.3.

各平台下载地址请查看发行列表：

https://github.com/coreos/etcd/releases/tag/v3.3.9