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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2012/08/20 16:37:38 UTC
[jira] [Commented] (CASSANDRA-1123) Allow tracing query details
[ https://issues.apache.org/jira/browse/CASSANDRA-1123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13437903#comment-13437903 ]
Jonathan Ellis commented on CASSANDRA-1123:
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bq. Finally I'm having issues using the index from thrift. Is there an incompatibility (i.e., using an IndexExpression with a CQL3 table?).
Yes, see https://issues.apache.org/jira/browse/CASSANDRA-4377?focusedCommentId=13436817&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13436817
> Allow tracing query details
> ---------------------------
>
> Key: CASSANDRA-1123
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1123
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: David Alves
> Fix For: 1.2.0
>
> Attachments: 1123-3.patch.gz, 1123.patch, 1123.patch
>
>
> 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:
> http://research.google.com/pubs/pub36356.html
> http://www.usenix.org/events/osdi04/tech/full_papers/barham/barham_html/
> http://www.usenix.org/event/nsdi07/tech/fonseca.html
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