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From "Jeremiah Jordan (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-6042) Add WARN when there are a lot of tombstones in a query
Date Wed, 18 Sep 2013 23:46:52 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13771401#comment-13771401
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Jeremiah Jordan edited comment on CASSANDRA-6042 at 9/18/13 11:45 PM:
----------------------------------------------------------------------

Or we can set it as DEBUG, and people can enable the message when they need to debug it. 
But *I* still like the idea of yelling at people who are "doing it wrong".  Even at DEBUG
I would still put some kind of threshold on it, as you don't want EVERY read triggering the
log message, though at DEBUG it could be small, like 100 or 200.
                
      was (Author: jjordan):
    Or we can set it as DEBUG, and people can enable the message when they need to debug it.
 But *I* still like the idea of yelling at people who are "doing it wrong".
                  
> Add WARN when there are a lot of tombstones in a query
> ------------------------------------------------------
>
>                 Key: CASSANDRA-6042
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6042
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jeremiah Jordan
>            Assignee: Lyuben Todorov
>            Priority: Minor
>             Fix For: 1.2.10
>
>
> Now that we count the number of tombstones hit (so it can go in tracing), can we pick
some threshold (or make it configurable with 0 being don't warn), and spit out a warning saying
"Just went through 10000 tombstones in partition XYZ".
> Right now if you are having GC problems because some row got a bunch of tombstones, you
can turn on server side tracing, and hope the bad query gets in there, or you can keep making
heap dumps, dig through them, and hope you catch the query in there.
> I have seen code problems at multiple places causing this same issue (some code causing
way more tombstones than it should, for just one row).  And it is a PITA+Luck to debug it
right now.

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