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From Matija Gobec <>
Subject Re: How to get information of each read/write request?
Date Tue, 30 Aug 2016 19:08:45 GMT
Hi Jun,

If you are looking to track each request zipking is your best bet. The last
pickle has a blog
about tracing using zipkin.
Regarding the stats you see in nodetool did you check the metrics package
in cassandra and what it exposes over JMX?


On Tue, Aug 30, 2016 at 7:20 PM, Jun Wu <> wrote:

> Hi there,
>      I'm very interested in the read/write path of Cassandra.
> Specifically, I'd like to know the whole process when a read/write request
> comes in.
>     I noticed that for reach request it could go through multiple stages.
> For example, for read request, it could be in ReadStage,
> RequestResponseStage, ReadRepairStage. For each stage, actually it's a
> queue and thread pool to serve the request.
>    First question is how to track each request in which stage.
>    Also I'm very interested int the waiting time for each request to be in
> the queue, also the total queue in each stage. I noticed that in nodetool
> tpstats will have this information. However, I may want to get the
> real-time information of this, like print it out in the terminal.
>     I'm wondering  whether someone has hints on this.
>    Thanks in advance!
> Jun

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