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Jeremiah Jordan edited comment on CASSANDRA-6042 at 9/18/13 8:57 PM:
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I still think it is useful to have this, unless CASSANDRA-6057 is going to tell
me the offending row key. This is helping for the case of "I know I have a
tombstone issue, wtf row is it in?". Also I have no problem making it painful
for people who do this knowing they are "doing it wrong", to give a nudge to
people who don't realize they are "doing it wrong".
was (Author: jjordan):
I still think it is useful to have this, unless CASSANDRA-6057 is going to
tell me the offending row key. This is helping for the case of "I know I have
a tombstone issue, wtf row is it in?"
> 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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