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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2011/04/01 20:27:05 UTC

[jira] [Commented] (HBASE-3660) HMaster will exit when starting with stale data in cached locations such as -ROOT- or .META.

    [ https://issues.apache.org/jira/browse/HBASE-3660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014782#comment-13014782 ] 

stack commented on HBASE-3660:
------------------------------

Confirmation that this patch fixes the above issue beyond Cosmin's thumbs-up can be found here: http://search-hadoop.com/m/lsm232yCTxf/oRouteToHostException+causes+Master+abort+when+the+RegionServer+hosting+ROOT+is+not+available%2522&subj=NoRouteToHostException+causes+Master+abort+when+the+RegionServer+hosting+ROOT+is+not+available

> HMaster will exit when starting with stale data in cached locations such as -ROOT- or .META.
> --------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3660
>                 URL: https://issues.apache.org/jira/browse/HBASE-3660
>             Project: HBase
>          Issue Type: Bug
>          Components: master, regionserver
>    Affects Versions: 0.90.1
>            Reporter: Cosmin Lehene
>            Priority: Critical
>             Fix For: 0.90.2
>
>         Attachments: 3660.txt, HBASE-3660.patch
>
>
> later edit: I've mixed up two issues here. The main problem is that a client (that could be HMaster) will read stale data from -ROOT- or .META. and not deal correctly with the raised exceptions. 
> I've noticed this when the IP on my machine changed (it's even easier to detect when LZO doesn't work)
> Master loads .META. successfully and then starts assigning regions.
> However LZO doesn't work so HRegionServer can't open the regions. 
> A client attempts to get data from a table so it reads the location from .META. but goes to a totally different server (the old value in .META.)
> This could happen without the LZO story too.

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