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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12542) Delete a family of table online will crash regionserver
Date Mon, 22 Dec 2014 21:22:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14256205#comment-14256205
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stack commented on HBASE-12542:
-------------------------------

bq. Please use EnvironmentEdgeManager

[~ted_yu] If you are going to ask that contributors do this, suggest you write up a page for
the refguide on why contribs should do this in first place; without it your suggestion seems
to come out of thin air given some places do this but other places in code base still do System.currentTimeMillis

> Delete a family of table online will crash regionserver 
> --------------------------------------------------------
>
>                 Key: HBASE-12542
>                 URL: https://issues.apache.org/jira/browse/HBASE-12542
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: HBASE-12542-v1.diff
>
>
> Using alter command to delete a family of table online will make the regionsevers that
serve the regions of the table crash.
> {code}
> alter 't', NAME => 'f', METHOD => 'delete'
> {code}
> The reason is that TableDeleteFamilyHandler in HMaster delete the family dir firstly
and then reopen all the regions of table.
> When the regionserver reopen the region, it will crash for the exception in flushing
memstore to hfile of the deleted family during closing the region, because the parent dir
of the hfile has been deleted in TableDeleteFamilyHandler.
> See: TableDeleteFamilyHandler.java #57
> A simple solution is change the order of operations in TableDeleteFamilyHandler.
> - update table descriptor first, 
> - reopen all the regions,
> - delete the the family dir at last.
> Suggestions are welcomed.



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