Harry Hough created CASSANDRA-14451:
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             Summary: Infinity ms Commit Log Sync
                 Key: CASSANDRA-14451
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14451
             Project: Cassandra
          Issue Type: Bug
         Environment: Cassandra 3.11.2

2 DC

6 Servers per dc
            Reporter: Harry Hough


Its giving commit log sync warnings where there were apparently zero syncs and 
therefore gives "Infinityms" as the average duration

{code:java}
WARN [PERIODIC-COMMIT-LOG-SYNCER] 2018-05-16 21:11:14,294 NoSpamLogger.java:94 
- Out of 0 commit log syncs over the past 0.00s with average duration of 
Infinityms, 1 have exceeded the configured commit interval by an average of 
74.40ms 
WARN [PERIODIC-COMMIT-LOG-SYNCER] 2018-05-16 21:16:57,844 NoSpamLogger.java:94 
- Out of 0 commit log syncs over the past 0.00s with average duration of 
Infinityms, 1 have exceeded the configured commit interval by an average of 
198.69ms 
WARN [PERIODIC-COMMIT-LOG-SYNCER] 2018-05-16 21:24:46,325 NoSpamLogger.java:94 
- Out of 0 commit log syncs over the past 0.00s with average duration of 
Infinityms, 1 have exceeded the configured commit interval by an average of 
264.11ms 
WARN [PERIODIC-COMMIT-LOG-SYNCER] 2018-05-16 21:29:46,393 NoSpamLogger.java:94 
- Out of 32 commit log syncs over the past 268.84s with, average duration of 
17.56ms, 1 have exceeded the configured commit interval by an average of 
173.66ms{code}



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