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https://issues.apache.org/jira/browse/ACCUMULO-1502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13746890#comment-13746890
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Jared Winick commented on ACCUMULO-1502:
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I would like to help out here. I have starting playing around with tracing and
have seen the existing docs in docs/distributedTracing.html. I just have a few
initial questions, technical and administrative.
1.) Should the documentation go in 1.5.1-SNAPSHOT? Seems like it would be
reasonable to get into the 1.5 code
2.) Is the Administration chapter of the user manual the appropriate place?
Maybe right after Monitoring?
3.) What server-side operations are traced by default? I have seen minor/major
compactions and GC.
4.) Sampling rate is currently left explicitly to the user via CountSampler,
correct?
5.) Is there a good way to trace a write without flushing the BatchWriter? I
know the actual writes to the tablet servers are asynchronous from adding
mutations so maybe it isn't possible.
Thanks for any feedback that can be provided.
> Add Trace Table docs to user manual
> -----------------------------------
>
> Key: ACCUMULO-1502
> URL: https://issues.apache.org/jira/browse/ACCUMULO-1502
> Project: Accumulo
> Issue Type: Sub-task
> Components: docs, trace
> Reporter: Sean Busbey
> Fix For: 1.6.0
>
>
> Our feature list includes:
> {quote}
> TRACING
> It can be difficult to determine why some operations are taking longer than
> expected. For example, you may be looking up items with very low latency, but
> sometimes the lookups take much longer. Determining the cause of the delay is
> difficult because the system is distributed, and the typical lookup is fast.
> Accumulo has been instrumented to record the time that various operations
> take when tracing is turned on. The fact that tracing is enabled follows all
> the requests made on behalf of the user throughout the distributed
> infrastructure of Accumulo, and across all threads of execution.
> {quote}
> and the user manual makes no mention of the facility, its defaults, how to
> configure it, nor how to leverage it in ops.
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