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From "Chris Goffinet (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2116) Separate out filesystem errors from generic IOErrors
Date Tue, 17 May 2011 22:51:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035111#comment-13035111
] 

Chris Goffinet commented on CASSANDRA-2116:
-------------------------------------------

Unfortunately the best we can get is IOError from Java. For example we use this patch to actually
detect when our raid array dies, the OS will tell java to throw IOError. I think we should
error on the side of, if data is corrupt, we should let the operator decide what mode he wants.
For us, any errors or any corruption of data, we want to take the node out right away.

We have been testing this in production for awhile and it works really well when disks die,
and we also did tests involving removing drives from the system while it was serving traffic.


The Read/Write classes was a similar idea of how the Hadoop code base handles this very issue.


> Separate out filesystem errors from generic IOErrors
> ----------------------------------------------------
>
>                 Key: CASSANDRA-2116
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2116
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Chris Goffinet
>            Priority: Minor
>             Fix For: 1.0
>
>         Attachments: 0001-Separate-out-filesystem-errors-from-generic-IOErrors.patch
>
>
> We throw IOErrors everywhere today in the codebase. We should separate out specific errors
such as (reading, writing) from filesystem into FSReadError and FSWriteError. This makes it
possible in the next ticket to allow certain failure modes (kill the server if reads or writes
fail to disk).

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