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Posted to commits@cassandra.apache.org by "C. Scott Andreas (JIRA)" <ji...@apache.org> on 2019/04/01 22:42:00 UTC
[jira] [Commented] (CASSANDRA-14108) Improve commit log chain
marker updating
[ https://issues.apache.org/jira/browse/CASSANDRA-14108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16807242#comment-16807242 ]
C. Scott Andreas commented on CASSANDRA-14108:
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[~jasobrown] Sorry for the assignment change; I hit the key combo by mistake while viewing this issue.
> Improve commit log chain marker updating
> ----------------------------------------
>
> Key: CASSANDRA-14108
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14108
> Project: Cassandra
> Issue Type: Bug
> Reporter: Jason Brown
> Assignee: Jason Brown
> Priority: Normal
> Fix For: 3.0.16, 3.11.2, 4.0
>
>
> CASSANDRA-13987 addressed the commit log behavior change that was introduced with CASSANDRA-3578. After that patch was committed, [~aweisberg] did his own review and found a bug as well as having some concerns about the configuration. He and I discussed offline, and agreed on some improvements.
> Instead of requiring users to configure a deep, dark implementation detail like the commit log chained markers (via {{commitlog_marker_period_in_ms}} in the yaml), we decided it is best to eliminate thew configuration and always update the chained markers (when in periodic mode).
> The bug [~aweisberg] found was when the chained marker update is not a value that evenly divides into the periodic sync mode value, we would not sync in an expected manner. For example if the marker interval is 9 seconds, and the sync interval is 10 seconds, we would update the markers at time9, but we would then sleep for another 9 seconds, and when we wake up at time18, it is then that we flush - 8 seconds later than we should have.
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