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From Eric Newton <>
Subject Re: Trace log
Date Wed, 07 May 2014 20:55:24 GMT
Your request can cause some spans to start asynchronously.  Also, spans are
sent to the tracer asynchronously.  The result is that some of the spans
may not be recorded by the time that your request finishes.  When this
happens, children of those requests will exist, but their parent spans are
not found.  The shell retries a few times with a small wait, but it will
give up and just print the child spans not knowing what started them.

It can also be a bug in the trace logic.  A span that was opened, but never
closed, for example.


On Mon, May 5, 2014 at 7:28 PM, Amit Kapoor <> wrote:

> Hi folks,
>   We are trying to use a variation of IntersectingIterator and turned on
> trace to help us debug
>   certain performance issues (more on that in a separate email). The trace
> log page is showing
>   this:
>        Warning: the following spans are not rooted!
>   49561cfdf8e1ca5e fa33ce2827eb1141 client:startMultiScan
>   c70795aa7b14de02 f6457a7e4060dec4 client:startMultiScan
>   8ecd2bd6e0342911 751d55532acecba7 client:startMultiScan
>   74a8d66d235750b2 b82977a699403c46 client:startMultiScan
>   ...
>   Any hints on what is going on here?
>   regards
> Amit

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