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From "Nick Bailey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10907) Nodetool snapshot should provide an option to skip flushing
Date Mon, 21 Dec 2015 18:18:46 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15066826#comment-15066826
] 

Nick Bailey commented on CASSANDRA-10907:
-----------------------------------------

My only objection is that the behavior of what information is actually backed up is basically
undefined. It's possibly it's useful in some very specific use cases but it also introduces
potential traps when used incorrectly.

It sounds to me like you should be using incremental backups. When that is enabled a hardlink
is created every time a memtable is flushed or an sstable streamed. You can then just watch
that directory and ship the sstables off node on demand as they are created.

> Nodetool snapshot should provide an option to skip flushing
> -----------------------------------------------------------
>
>                 Key: CASSANDRA-10907
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10907
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Configuration
>         Environment: PROD
>            Reporter: Anubhav Kale
>            Priority: Minor
>              Labels: lhf
>
> For some practical scenarios, it doesn't matter if the data is flushed to disk before
taking a snapshot. However, it's better to save some flushing time to make snapshot process
quick.
> As such, it will be a good idea to provide this option to snapshot command. The wiring
from nodetool to MBean to VerbHandler should be easy. 
> I can provide a patch if this makes sense.



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