使用MetricsServlet在Cassandra中获取指标 [英] Using MetricsServlet to fetch metrics in Cassandra

问题描述

我想获取我的每个Cassandra节点（不使用JMX）作为JSON对象的各种指标，例如读/写延迟，磁盘利用率等。在我看来， MetricsServlet 可以做到这一点。但是，我仍然无法弄清楚，要使用它，我需要做些什么（Cassandra不附带metrics-servlets）。如果能得到一些建议/示例代码（用于获取任何指标），我将不胜感激。

I want to fetch various metrics like read/write latency, disk utilisation etc. of each of my Cassandra nodes(without using JMX) as a JSON object. It seems to me that MetricsServlet, can do exactly that. However, I'm still not able to figure out, what all do I need to do in order to use it(metrics-servlets does not come with Cassandra). I'll appreciate if I can get some advice/sample code(for fetching any metric).

推荐答案

Cassandra不是Java Web服务器，它不支持Servlet。您需要在与Cassandra相同的JVM中启动Java Web服务器并加载这些servlet。虽然可能通过JMX查询指标并使用外部应用程序将其转换为JSON或使用 MX4J （我会推荐）

Cassandra is not a java web server, it doesnt support servlets. You would need to start a java web server in same JVM as Cassandra and load those servlets. While possible its probably a lot less work to just query the metrics via JMX and convert to JSON with an external application or to expose JMX via http with something like MX4J (what I would recommend)

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