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Linux Cassandra集群升级:滚动升级与零停机实践

  • 2026-02-05 00:13:38
Linux Cassandra集群升级:滚动升级与零停机实践

Linux Cassandra集群升级:滚动升级与零停机实践

一、Cassandra 升级原理与兼容性

1.1 滚动升级(Rolling Upgrade)原理

Cassandra 无主架构支持混合版本运行:

  • 新版本节点加入集群(如扩容)
  • 协议兼容:Gossip、Streaming、CQL协议向后兼容
  • 数据格式:SSTable格式逐版本演进(需upgradesstables)

过程:

  1. 一个一个节点停机、升级二进制、启动
  2. 新节点bootstrap或replace加入
  3. 全集群升级后,运行upgradesstables转换格式

零停机关键:RF≥3 + QUORUM一致性,确保升级中多数副本可用。

1.2 版本兼容矩阵(截至2026年1月)

从\到
4.0.x
4.1.x
5.0.x
3.11.x
支持
支持
不支持
4.0.x
-
支持
支持(在线)
4.1.x
不支持
-
支持(在线)
5.0.x
不支持
不支持
-
  • 小版本(5.0.1 → 5.0.6):直接滚动,二进制替换
  • 大版本(4.1 → 5.0):官方支持在线滚动,但需注意SSTable格式(mc/mv新格式)
  • 不支持跳重大版本(如3 → 5)

Java兼容:5.0要求Java 11/17(推荐17)

1.3 风险评估

  • 低风险:小版本patch(bugfix)
  • 中风险:minor(如5.0.0 → 5.0.6)
  • 高风险:major(如4 → 5),新特性可能引入回归

生产建议:先读CHANGES.txt与release notes。


二、小版本滚动升级实战(5.0.x 内)

2.1 准备工作

  1. 备份:全Snapshot + Incremental
  2. 测试集群验证:相同配置升级,压测
  3. 监控就绪:Grafana告警抑制升级窗口
  4. 下载新版本:/opt/apache-cassandra-5.0.6-bin.tar.gz

2.2 单节点升级步骤

对每个节点顺序执行(建议一次1-3节点):

  1. nodetool drain # flush Memtable,停止写
  2. systemctl stop cassandra
  3. 备份旧二进制:mv /opt/cassandra /opt/cassandra-old
  4. 解压新版本,软链 /opt/cassandra → 新目录
  5. 对比配置文件(yaml/env),合并变更
  6. systemctl start cassandra
  7. 监控:nodetool status(新节点JOINING → NORMAL)
  8. nodetool netstats 检查streaming

全集群后:

nodetool upgradesstables  # 转换SSTable格式(可选,小版本通常无需)

2.3 自动化脚本

#!/bin/bash
# upgrade_node.sh <host>

HOST=$1
NEW_TAR=/opt/apache-cassandra-5.0.6-bin.tar.gz

ssh $HOST << EOF
nodetool drain
systemctl stop cassandra
mv /opt/cassandra /opt/cassandra-$(date +%Y%m%d)
tar -xzf $NEW_TAR -C /opt
ln -sfn /opt/apache-cassandra-5.0.6 /opt/cassandra
systemctl start cassandra
EOF

# 监控
nodetool status

Ansible playbook更佳。


三、大版本升级实战(4.1 → 5.0)

3.1 特殊准备

  • Java升级到17
  • 配置变更:num_tokens降低(5.0推荐32)、memtable_allocation_type=offheap_objects
  • 新特性测试:Trie Memtable、UCS

3.2 升级步骤(滚动)

相同小版本,但额外:

  1. 升级后节点启动,可能日志警告旧格式SSTable
  2. 全集群升级完成(混合运行期监控一致性)
  3. 执行:
nodetool upgradesstables -a  # 全表升级格式(耗IO,夜间)
  • 5.0新SSTable(Trie)不可降级

3.3 零停机保障

  • 客户端驱动支持token aware + 降级一致性
  • RF=3 + QUORUM:单节点升级不影响
  • 流量切换:升级前drain,升级后验证

四、回滚方案

4.1 小版本回滚

  • 保留旧二进制
  • drain + stop + 切换软链 + start
  • 若upgradesstables已跑:不可回(格式变更)

4.2 大版本回滚

  • 高风险:5.0新格式不可读4.x
  • 方案:从备份Snapshot + sstableloader重建旧版本集群
  • 预防:升级前全备份

生产黄金法则:升级前必备份,可回滚窗口内禁upgradesstables。


五、常见升级问题排查

  1. 节点无法加入 → 版本不兼容 → 检查CHANGES.txt协议变更
  2. Streaming失败 → 新格式不兼容 → 先升级部分节点
  3. 性能回归 → 新GC行为 → 调G1参数
  4. upgradesstables卡住 → IO风暴 → 限速 + 分表
  5. CQL不兼容 → 新保留字 → 应用调整

日志关键:grep "Upgrade" system.log

案例:

  • 某公司4.1→5.0,upgradesstables后读延迟高 → Trie bloom filter调优,恢复
  • 小版本patch,节点OOM → 新bug → 回滚旧版
  • 跳版本升级失败 → 中间版本过渡

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  1. CONNECT:[ UseTime:0.000862s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001345s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000595s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000558s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001414s ]
  6. SELECT * FROM `set` [ RunTime:0.000493s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001315s ]
  8. SELECT * FROM `article` WHERE `id` = 462991 LIMIT 1 [ RunTime:0.000887s ]
  9. UPDATE `article` SET `lasttime` = 1770545035 WHERE `id` = 462991 [ RunTime:0.013271s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000522s ]
  11. SELECT * FROM `article` WHERE `id` < 462991 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001028s ]
  12. SELECT * FROM `article` WHERE `id` > 462991 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001030s ]
  13. SELECT * FROM `article` WHERE `id` < 462991 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001983s ]
  14. SELECT * FROM `article` WHERE `id` < 462991 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001837s ]
  15. SELECT * FROM `article` WHERE `id` < 462991 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003162s ]
0.166639s