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From "Billie Rinaldi (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3715) Decrease sampling percentage for tracing
Date Wed, 08 Apr 2015 14:59:12 GMT


Billie Rinaldi commented on ACCUMULO-3715:

I suggest two approaches; one is to introduce configurable sampling parameters for majc, minc,
gc, and replication tracing, defaulting slightly lower than they do now (currently trying
out majc 1.0 => 0.1, minc 1.0 => 0.1, gc 0.01 stays, replication 1.0 and 0.1 for different
ops => 0.1).  Another is to reintroduce a minimum span length to the span receiver (in
earlier versions the min span size was 1ms, but now it is 0ms).  This could be configured
differently for HDFS and Accumulo, so we could keep min 0ms for Accumulo and set a higher
min for HDFS, e.g. 1ms.

> Decrease sampling percentage for tracing
> ----------------------------------------
>                 Key: ACCUMULO-3715
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: trace
>            Reporter: Billie Rinaldi
>            Assignee: Billie Rinaldi
>            Priority: Critical
>             Fix For: 1.7.0
> Now that HDFS has tracing, individual traces might collect much more tracing data than
they did previously.  We should have a way of controlling how much tracing data is collected
other than just turning off HDFS tracing.

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