[GitHub] [zookeeper] hanm opened a new pull request #989: ZOOKEEPER-3430: Observability improvement: provide top N read / write path queries.

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hanm opened a new pull request #989: ZOOKEEPER-3430: Observability improvement: provide top N read / write path queries.
URL: https://github.com/apache/zookeeper/pull/989
 
 
   We would like to have a better understanding of the type of workloads hit ZK, and one aspect of such understanding is to be able to answer queries of top N read and top N write request path. Knowing the hot request paths will allow us better optimize for such workloads, for example, enabling path specific caching, or change the path structure (e.g. break a long path to hierarchical paths).
   
   This commit adds a RequestPathMetricsCollector which will collect path requests stats and answers such queries. There are also a set of new Java system properties that make this collector highly configurable, including disable it totally (the default option is on.).
   
   The stats can also be queried through commands, which I will add in a different pull request once this landed, since this one is already big.

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