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Linux Cassandra修复工具:Repair 的原理、策略与调度实践

  • 2026-01-15 02:19:40
Linux Cassandra修复工具:Repair 的原理、策略与调度实践

Linux Cassandra修复工具:Repair 的原理、策略与调度实践

一、Repair 原理详解:反熵与 Merkle Tree

1.1 为什么需要 Repair?

Cassandra 最终一致性模型:

  • 写操作:Coordinator 并行写RF副本,根据一致性级别ACK
  • 故障场景:节点宕机 → Hinted Handoff临时存储(默认3小时)
  • Hint超时或网络分区 → 副本间数据不一致

反熵机制(Anti-Entropy):

  • Repair:主动比较副本间数据差异,同步缺失/旧版本
  • Read Repair:读时被动修复(概率默认10%)
  • Hinted Handoff:临时修复

生产依赖:主动Repair是保证强一致性的必须操作。

1.2 Merkle Tree(默克尔树)原理

Repair核心数据结构:Merkle Tree(哈希树)

  • 每个节点为范围(Token range)构建Merkle Tree
  • 叶子节点:数据块哈希(默认每128行)
  • 上层:子节点哈希组合
  • 根哈希相同 → 数据一致;不同 → 递归比较子树 → 定位差异范围

优势:

  • 差异检测高效(O(log n))
  • 传输最小差异数据

构建过程:

  1. 每个副本节点独立构建树(内存开销,5.0 Trie优化降低)
  2. 交换树,比较根哈希
  3. 差异子树 → streaming同步

5.0优化:更深树层级,内存更省。

1.3 Repair 类型

  • Full Repair:全范围重建Merkle树,同步所有差异(耗资源)
  • Incremental Repair(4.0+推荐):仅未repair部分,标记已repair SSTable(anticompaction避免风暴)
  • Subrange Repair:指定Token范围
  • Validation Repair:轻量,仅构建树不同步(诊断用)

二、Repair 策略与命令实战

2.1 nodetool repair 核心选项

基本命令:

nodetool repair [options] [keyspace] [table]

关键选项:

  • -full:全量repair(慎用)
  • -inc:增量repair(默认,推荐)
  • -pr:Primary Range,仅修本节点主范围(并行安全,必加)
  • -seq:Sequential,顺序修范围(与-pr结合,分批)
  • -j:并行job数(默认1)
  • -tr:Tracer概率
  • -start-token / -end-token:子范围repair

生产推荐:

nodetool repair -pr -inc keyspace table   # 单表增量主范围
nodetool repair -pr -seq -inc             # 全集群顺序增量

2.2 策略对比

策略
适用场景
资源消耗
一致性保障
生产推荐度
Full Repair
小集群/初始化
最强
低(风暴风险)
Incremental Repair
大中型生产集群
高(必选)
Subrange Repair
热点范围/紧急修复
局部
Read Repair Only
测试/低一致性业务
极低
不推荐

5.0变化:增量repair更高效,支持UCS anticompaction自动。

2.3 多DC Repair 注意

  • 默认仅本DC
  • 加-dc:指定DC
  • 跨DC:网络带宽评估

三、Repair 调度实践

3.1 调度频率与窗口

  • 小集群:每周full repair
  • 中大型:每周增量repair + 每月full(或仅增量)
  • 时间窗口:夜间低峰,结合Compaction限速

3.2 自动化调度脚本

Opscenter或自研脚本:

#!/bin/bash
# weekly_repair.sh

KEYSPACES="prod logs"

for ks in$KEYSPACESdo
    TABLES=$(cqlsh -e "DESC TABLES FROM $ks" | grep -v system)
for table in$TABLESdo
echo"Repairing $ks.$table"
        nodetool repair -pr -inc -seq $ks$table
done
done

crontab:

0 2 * * 0 /opt/scripts/weekly_repair.sh >> /var/log/cassandra_repair.log 2>&1

大集群:分批(nodetool -h host repair)

工具:Reaper for Cassandra(开源repair管理器,推荐)

  • 自动分段、并行、安全暂停

3.3 Anticompaction 防控风暴

增量repair后:

  • 标记已repair SSTable
  • Compaction跳过已标记 → 避免立即合并风暴

监控:nodetool compactionstats


四、Repair 监控与诊断

4.1 Metrics

  • cassandra_repair_*
  • Pending/Completed/Successful

Grafana面板:Repair进度、失败率

4.2 日志

grep "Repair" /var/log/cassandra/system.log
# 关注:Merkle tree build time, differences found

4.3 验证一致性

工具:cassandra-consistency-checker 或读写对比测试


五、生产最佳实践与常见坑

  1. 必加-pr:避免多节点重复修同一范围
  2. 优先增量:full仅初始化或紧急
  3. 分批调度:大集群>100节点,用Reaper
  4. 结合备份:repair后snapshot
  5. 多DC独立:每个DC单独调度

常见问题:

  • Repair卡住 → Merkle树构建慢(大Partition) → 分区优化
  • 网络风暴 → 未-seq → 加顺序
  • 不一致未修复 → 漏表 → 脚本覆盖所有
  • 内存高 → 树构建 → 调repair_session_space_in_mb

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  1. CONNECT:[ UseTime:0.000639s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000792s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002462s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001266s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000500s ]
  6. SELECT * FROM `set` [ RunTime:0.000183s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000703s ]
  8. SELECT * FROM `article` WHERE `id` = 462245 LIMIT 1 [ RunTime:0.012841s ]
  9. UPDATE `article` SET `lasttime` = 1770600550 WHERE `id` = 462245 [ RunTime:0.000790s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000256s ]
  11. SELECT * FROM `article` WHERE `id` < 462245 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000651s ]
  12. SELECT * FROM `article` WHERE `id` > 462245 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000403s ]
  13. SELECT * FROM `article` WHERE `id` < 462245 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.014662s ]
  14. SELECT * FROM `article` WHERE `id` < 462245 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.044846s ]
  15. SELECT * FROM `article` WHERE `id` < 462245 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001804s ]
0.156002s