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Posted to dev@bookkeeper.apache.org by "Rakesh R (Commented) (JIRA)" <ji...@apache.org> on 2012/03/30 14:56:26 UTC
[jira] [Commented] (BOOKKEEPER-199) Provide bookie readonly mode,
when journal/ledgers flushing has failed with IOE
[ https://issues.apache.org/jira/browse/BOOKKEEPER-199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242308#comment-13242308 ]
Rakesh R commented on BOOKKEEPER-199:
-------------------------------------
Following are just some thoughts to take the first step:
# *ledger flushing throws IOException:*
Say bookie has multiple ledger dirs -> /tmp/bk1-data, /tmp/bk2-data)
On IOException, bookie should consider next ledger dir and probably mark the tried dirs as BAD_FOR_WRITE, so this will not be selected next time. Finally, if there is no success, then switch bookie to r-o mode.
# *Journal flushing throws IOException:*
Immediately switch to r-o mode. AFAIK, there is no multiple dirs for the journal.
Thanks,
Rakesh
> Provide bookie readonly mode, when journal/ledgers flushing has failed with IOE
> -------------------------------------------------------------------------------
>
> Key: BOOKKEEPER-199
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-199
> Project: Bookkeeper
> Issue Type: Sub-task
> Components: bookkeeper-server
> Affects Versions: 4.0.0
> Reporter: Rakesh R
> Assignee: Rakesh R
> Priority: Critical
>
> Bookkeeper should change to readonly(r-o) mode when the journal/ledgers flushing has failed with IOException. Later on, reject write requests on server side and will accept only the read requests from the clients, because even if flushing fails, the data in the bookie which has been flushed is still valid.
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