[Feature]集群均衡支持LogDir级别的Disk均衡(#1164) #1166
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变更的目的是什么
fix issue #1164
简短的更新日志
集群均衡时,将原有的Node级别的Disk均衡修改为LogDir级别的Disk均衡。初始从broker拉取每个Replica在LogDir上的分布,LogDir总容量默认为broker磁盘总容量/该broekr上LogDir数量 (默认每个LogDir大小相同),由此计算出合理的Replica迁移方案,实现LogDir级别的Disk均衡。
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