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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-934) Assigning all regions to one server only
Date Wed, 01 Sep 2010 05:32:54 GMT

     [ https://issues.apache.org/jira/browse/HBASE-934?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

stack resolved HBASE-934.

    Resolution: Won't Fix

New LoadBalancer added by HBASE-2692 does away with this 'single-server-only' notion.  The
prob. described above is no longer possible

> Assigning all regions to one server only
> ----------------------------------------
>                 Key: HBASE-934
>                 URL: https://issues.apache.org/jira/browse/HBASE-934
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>             Fix For: 0.90.0
> From Rong-en who has two regionservers:
> {code}
> When the second HRS starts up, but when all regions
> are still not assigned to the first server. The 2nd HRS keeps
> silence (though it's visible at master's ui). Once all regions are
> assigned to first server, the balancer kicks in. Finally, the
> regions are evenly split to two servers.
> {code}
> And then on IRC:
> {code}
> [21:38]    <rafan>    st^ack: got my mail?
> [21:48]    <st^ack>    You have two HRSs?
> [21:49]    <st^ack>    There is an odd decision made in the master that goes something
like "is there only one regionserver? or are there more". If it decides the answer is 1, it
just dumps all to it.
> [21:49]    <st^ack>    My guess is that in your case, it decided that all regions
were for server 1.
> [21:50]    <st^ack>    Mind making a JIRA? Let the master parcel out the regions...
the rate can vary with the number of OPEN messages it gets back.
> [21:50]    <st^ack>    Allow that other regions could come in meantime? 
> {code}
> If many regions, master should allow that while its assigning, other regionservers could
come online rather than make the binary decision "There is only one regionserver in this cluster"

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