May 2024
Intermediate
425 pages
12h 29m
Chinese
Content preview from CockroachDB权威指南
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404
|
第
15
章
导致重要工作的故障或性能的下降。
管控旨在对工作进行优先排序，以避免这些问题出现。当管控被启用时，
CockroachDB
将请求和响应操作按优先级排序到工作队列中，优先给高优先级的操作。对节点运行状
况至关重要的内部操作（如节点活动性心跳）给予高优先级处理。管控系统还对持有锁
的事务进行优先级排序，通过及时释放锁来减少争用。默认情况下，管控是关闭的。启
用管控需要执行以下操作：
·
对于
KV
存储系统执行的工作，将
admission.kv.enabled
集群设置为
true
。
·
当接收
KV
响应时，为在
SQL
层执行的
admission.sql_kv_response.enabled
集群
设置为
true
。
·
当从分布式
SQL
接收响应时，为在
SQL
层执行的
admission.sql_sql_response.
enabled
集群设置为
true
。
如果你决定使用管控能力，我们建议对所有层启用管控。过载仪表板也会显示与管控系
统相关的指标，这些指标可以从
DB
控制台的
Metrics
部分获得。这些仪表板会显示诸如
CPU
利用率、存储引擎健康状态、管控系统状态等指标。过载仪表板界面如图
15-16
所示。
图 15-16：CockroachDB 控制台过载仪表板（高清版本请参考
https://cockroa.ch/cockroachDB-
figs
）
CockroachDB权威指南 正文.indd 404CockroachDB权威指南 正文.indd 404 2024-5-30 9:43:192024-5-30 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.