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From "Jonathan Shook (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-9378) Instrument the logger with error count metrics by level
Date Thu, 14 May 2015 02:16:59 GMT
Jonathan Shook created CASSANDRA-9378:

             Summary: Instrument the logger with error count metrics by level
                 Key: CASSANDRA-9378
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Jonathan Shook
            Priority: Minor

The ability to do sanity checks against logged errors and warning counts could be helpful
for several reasons. One of the most obvious would be as a way to verify that no errors were
logged during a (semi-) automated upgrade or restart process.

Fortunately, this is easy to enable as described here:

It was pointed out by [~jjordan] that this ability should exist in current version if the
user is willing to drop in the right jars and modify the appender config.

It would also be helpful as a programmatic feature with a toggle to enable or disable, possibly
with a cassandra.yaml config parameter. There may be some users who would prefer to disable
it to avoid calling another appender. If testing shows the overhead for this to be sufficiently
low, we could just leave it on by default.

These should be exposed via JMX when they are enabled.

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