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From Chris Lohfink <>
Subject Re: How to get information of each read/write request?
Date Tue, 30 Aug 2016 19:31:17 GMT
Running a query with trace (`TRACING ON` in cqlsh) can give you a lot of
the information for an individual request. There has been a ticket to track
time in queue ( but no
ones worked on it yet.


On Tue, Aug 30, 2016 at 12:20 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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