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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7948) client doesn't need to refresh meta while the region is opening
Date Tue, 05 Mar 2013 18:10:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13593694#comment-13593694

Sergey Shelukhin commented on HBASE-7948:

Can you please elaborate about more dangerous parts? 
In my experience it's not safe to trust anything forever as a general principle, not because
I think RS code is unreliable.
Even hardware itself is not reliable. Something as simple can happen as coincidence of RS
bug and watchdog bug. Maybe RS will go into some crazy state where noone can reach it except
client. Perhaps someone was debugging and killed some threads or whatever, so now RS won't
die and behaves abnormally. 
If master/RS cannot trust itself it may assert/halt/shut down, to prevent data loss.
But for client there's no data loss potential from flushing the cache, but there's potential
to be stuck forever in case of abnormal RS behavior. With remote things I prefer to be defensive
on all sides if practical :)
> client doesn't need to refresh meta while the region is opening
> ---------------------------------------------------------------
>                 Key: HBASE-7948
>                 URL: https://issues.apache.org/jira/browse/HBASE-7948
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>         Attachments: HBASE-7948-v0.patch, HBASE-7948-v1.patch, HBASE-7948-v1.patch, HBASE-7948-v2.patch

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