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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Resolved] (CASSANDRA-1123) Allow tracing query details
Date Thu, 30 Aug 2012 05:24:10 GMT


Jonathan Ellis resolved CASSANDRA-1123.

    Resolution: Fixed

committed.  (turns out I didn't push the revert earlier, so I just left that out when I did
> Allow tracing query details
> ---------------------------
>                 Key: CASSANDRA-1123
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: David Alves
>             Fix For: 1.2.0 beta 1
>         Attachments: 1123-3.patch.gz, 1123.patch, 1123.patch, 1123.patch, 1123.patch,
1123-v6.txt, 1123-v7.patch, 1123-v8.patch, 1123-v9.patch, 1123-v9.txt, 1123-v9.txt
> In the spirit of CASSANDRA-511, it would be useful to tracing on queries to see where
latency is coming from: how long did row cache lookup take?  key search in the index?  merging
the data from the sstables?  etc.
> The main difference vs setting debug logging is that debug logging is too big of a hammer;
by turning on the flood of logging for everyone, you actually distort the information you're
looking for.  This would be something you could set per-query (or more likely per connection).
> We don't need to be as sophisticated as the techniques discussed in the following papers
but they are interesting reading:

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