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From "David Alves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3564) flush before shutdown so restart is faster
Date Tue, 24 Jul 2012 21:15:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421757#comment-13421757
] 

David Alves commented on CASSANDRA-3564:
----------------------------------------

I suggest that we add flag that when enabled waits for the full flush for all tables and maybe
we don't even need the wait period since the user explicitely told that he wanted a full flush
and should be willing to wait. When the flag disabled reverts to the current setting (flush
only non-durable tables).

Even in the default setting (say the admin remembered he wanted to flush everything *after*
the daemon started) he can always use nodetool to do so.

                
> flush before shutdown so restart is faster
> ------------------------------------------
>
>                 Key: CASSANDRA-3564
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3564
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Packaging
>            Reporter: Jonathan Ellis
>            Assignee: David Alves
>            Priority: Minor
>             Fix For: 1.2
>
>         Attachments: 3564.patch, 3564.patch
>
>
> Cassandra handles flush in its shutdown hook for durable_writes=false CFs (otherwise
we're *guaranteed* to lose data) but leaves it up to the operator otherwise.  I'd rather leave
it that way to offer these semantics:
> - cassandra stop = shutdown nicely [explicit flush, then kill -int]
> - kill -INT = shutdown faster but don't lose any updates [current behavior]
> - kill -KILL = lose most recent writes unless durable_writes=true and batch commits are
on [also current behavior]
> But if it's not reasonable to use nodetool from the init script then I guess we can just
make the shutdown hook flush everything.

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