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From "Peter Schuller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2405) should expose 'time since last successful repair' for easier aes monitoring
Date Mon, 18 Apr 2011 12:37:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13021005#comment-13021005
] 

Peter Schuller commented on CASSANDRA-2405:
-------------------------------------------

IMO yes, since the aim was to make it easy to write a script. Poking JMX in a shell script
!= easy unless you happen to have crossed that threshold already; nodetool is one way to do
that.

Also: From brief inspection it seems it's storing the time of the *completion* of the last
successful repair. It needs to store the time of the *commencement* of the last successful
repair in order to be useful for monitoring for gc grace seconds purposes since that it what
determines at what point in the timeline the node is "guaranteed" to have seen writes.

> should expose 'time since last successful repair' for easier aes monitoring
> ---------------------------------------------------------------------------
>
>                 Key: CASSANDRA-2405
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2405
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Peter Schuller
>            Assignee: Pavel Yaskevich
>            Priority: Minor
>             Fix For: 0.7.5
>
>         Attachments: CASSANDRA-2405.patch
>
>
> The practical implementation issues of actually ensuring repair runs is somewhat of an
undocumented/untreated issue.
> One hopefully low hanging fruit would be to at least expose the time since last successful
repair for a particular column family, to make it easier to write a correct script to monitor
for lack of repair in a non-buggy fashion.

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