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From "Corentin Chary (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13031) Speed-up start-up sequence by avoiding un-needed flushes
Date Tue, 27 Dec 2016 07:33:58 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15779823#comment-15779823
] 

Corentin Chary commented on CASSANDRA-13031:
--------------------------------------------

Ok, back on the machine with a 2 HDD + RAID-0 (wich is not that uncommon): a single flush
takes ~500ms.
Boot time with the patch is 6 seconds with a single flush for the new generation number.
Boot time without that is 22 seconds (and that would be worse if we had views or peers).

I atteched both debug.log which contains detailed timing information.

> Speed-up start-up sequence by avoiding un-needed flushes
> --------------------------------------------------------
>
>                 Key: CASSANDRA-13031
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13031
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Corentin Chary
>            Priority: Minor
>             Fix For: 3.x
>
>         Attachments: 0001-Avoid-un-needed-system-flushes-on-startup.patch, debug-fast.log,
debug.log, debug_130131.diff, debug_130131_2.diff
>
>
> Similar to CASSANDRA-12969, do a conditional update for all functions
>     with a forced blocking flush to avoid slowed-down boot sequences. The
>     small performance hit of doing a read is always smaller than the one
>     associated with a fsync().



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