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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7392) Abort in-progress queries that time out
Date Tue, 06 Oct 2015 00:01:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14944284#comment-14944284
] 

Ariel Weisberg commented on CASSANDRA-7392:
-------------------------------------------

bq.  I don't think it strictly matters if we incorrectly say that there were more dropped
operations in one interval rather than the next. WDYT?
I agree it's fine.

bq. As for logging during unit tests, I've changed logback-test.xml since we cannot change
the log level at runtime, I hope that's OK. I think we have a problem with the TeeingAppender,
I could not see any log messages in the log files, only on stdout.
You are right it is dropping log output pretty badly in the test configuration. In the production
configuration it would drop less, but still doesn't have a working shutdown hook.

I dug a lot and finally got it to work by using the status listener to find out when file
appenders are created, cache them, then stop them on shutdown. I think this is a problem for
Paulo's work as well because this means the async appender won't be stopped. I created CASSANDRA-10447
for it.

So you set the filter in the logging to be more permissive, but only have the monitoring logger
running at debug? The other loggers won't emit debug statements? That sounds fine.

It looks like the NanoTimeToCurrentTimeMillis test can't check the condition it was checking
before which was that it kinda sort of work to try and propagate NTP updates. You could have
the test submit the update task to the STPE instead of notifying it. That could be a function
in NanoTimeToCurrentTimeMillis so the details aren't foisted onto the test.

> Abort in-progress queries that time out
> ---------------------------------------
>
>                 Key: CASSANDRA-7392
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7392
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Stefania
>            Priority: Critical
>             Fix For: 3.x
>
>
> Currently we drop queries that time out before we get to them (because node is overloaded)
but not queries that time out while being processed.  (Particularly common for index queries
on data that shouldn't be indexed.)  Adding the latter and logging when we have to interrupt
one gets us a poor man's "slow query log" for free.



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