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From "Jared Winick (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1502) Add Trace Table docs to user manual
Date Mon, 26 Aug 2013 21:27:51 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13750577#comment-13750577
] 

Jared Winick commented on ACCUMULO-1502:
----------------------------------------

Just added a patch to the Administration chapter of the docs. Does the User Manual HTML get
generated somehow from the TeX? I also started examples at https://github.com/jaredwinick/accumulo-tracing-example
that could be incorporated in with the other samples if desired. With respect to #5 above,
I am unable to get the behavior you describe (tracing of writes without explicitly calling
flush()) to work. I have attempted to make sure the asynchronous writes inside the BatchWriter
have completed by setting the timeout very low, but still no luck.
                
> 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
>
>         Attachments: ACCUMULO-1502.patch
>
>
> 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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