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From "Keith Turner (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-84) Logger should fail into read-only mode with disk full
Date Wed, 16 Nov 2011 18:38:51 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-84?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151409#comment-13151409
] 

Keith Turner commented on ACCUMULO-84:
--------------------------------------

I think when the logger switches to read only, the tablet server should get an error when
trying to write to it.  At that point the tablet server should switch to another logger. If
it can not find any logger, it will keep trying to find a logger and writes will be held.

I think a requirement that the logger leaves READ-ONLY mode and enters READ-WRITE mode once
disk space becomes available is reasonable and desirable.

                
> Logger should fail into read-only mode with disk full
> -----------------------------------------------------
>
>                 Key: ACCUMULO-84
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-84
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: logger
>    Affects Versions: 1.3.5, 1.4.0, 1.5.0
>            Reporter: John Vines
>            Assignee: Eric Newton
>              Labels: failover
>             Fix For: 1.5.0
>
>
> If the disk is full for a Logger it will kill itself quickly. Instead we should have
it fail into a 'read-only' mode, that way tservers can still do log recovery based on the
data it has. It needs to be treated in such a way that tservers won't rely on it to log their
new data, but can be used to recover older data.

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