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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Uber race between the balancer and parents that haven't been cleaned?
Date Wed, 25 Jan 2012 04:57:10 GMT
Oh yeah it's on top of handleSplitReport... mmm then I'm really
confused how the user on IRC got an uncleaned parent reassigned...

J-D

On Tue, Jan 24, 2012 at 8:41 PM, Stack <stack@duboce.net> wrote:
> On Tue, Jan 24, 2012 at 5:28 PM, Jean-Daniel Cryans <jdcryans@apache.org> wrote:
>> Right now it's possible to get split parents stuck in PENDING_CLOSE
>> simply by trying to balance them. Looking over the 0.90 code, we don't
>> remove the parent from AssignmentManager.servers until
>> CatalogJanitor.cleanParent() calls AssignmentManager.regionOffline()
>> BUT HMaster.balance() calls AssignmentManager.getAssignments() which
>> uses AssignmentManager.servers.
>>
>> Basically the issue is that a parent is considered well and assigned
>> until it gets cleaned up, which means that it's also considered during
>> reassignment.
>>
>
> This is 0.90?  Not 0.92?
>
> In 0.90, when we receive a split, the AM.handleSplit is called and it
> seems to do right thing (remove parent from RIT, regions and servers
> lists) so that it shouldn't be considered doing assignments.
>
> St.Ack

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