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Re: Clarification on --initial
From: Jon Stephens <jon(at)mysql.com>
Date: Fri Aug 17 2007 - 12:12:43 EDT
>> Hi!
>>
>> Thus spake Al on 08/16/2007 06:58 PM:
>>> Say I have two data nodes in my cluster that uses on-disk memory, and
>>> I'd like to add two more data nodes to the cluster. When restarting
>>> the cluster, I'll need to run ndbd --initial on all the data nodes,
>>> not just the new ones, correct?
>> I think not. If I get it right, starting a node with --initial will
>> effectively wipe it clean, so in your above scenario, you'd have a brand new
>> but empty four-node cluster.
>> I guess that's not what you want.
>> But I am getting a little confused by the whole tread...
>> Perhaps one of the enlightened could explain, what /is/ a scenario where you'd
>> use --initial?
>> It now seems there isn't one and I wonder why keep the option if it's not
>> dangerously misnamed but also superfluous?
>>
Date: Fri Aug 17 2007 - 12:12:43 EDT
Stewart Smith wrote:
> On Thu, 2007-08-16 at 19:53 +0200, Philipp Taprogge wrote:
>> Hi!
>>
>> Thus spake Al on 08/16/2007 06:58 PM:
>>> Say I have two data nodes in my cluster that uses on-disk memory, and
>>> I'd like to add two more data nodes to the cluster. When restarting
>>> the cluster, I'll need to run ndbd --initial on all the data nodes,
>>> not just the new ones, correct?
>> I think not. If I get it right, starting a node with --initial will
>> effectively wipe it clean, so in your above scenario, you'd have a brand new
>> but empty four-node cluster.
>> I guess that's not what you want.
> > It's the only (current) way to add data nodes. start a fresh cluster and > restore from backup. >
>> But I am getting a little confused by the whole tread...
>> Perhaps one of the enlightened could explain, what /is/ a scenario where you'd
>> use --initial?
>> It now seems there isn't one and I wonder why keep the option if it's not
>> dangerously misnamed but also superfluous?
>>
> > There is. > a) some configuration changes require --initial > b) when wanting to force a resync.
Thanks to all who've participated in this discussion; I've just overhauled the Manual's description of ndbd --initial and when it ought to be used. Feel free to drop me a note if I've missed anything.
cheers
jon.
-- Jon Stephens - jon@mysql.com Technical Writer - MySQL Documentation Team Mobile (Sweden): +46 (0) 73 677 39 93 (GMT +02.00) MySQL AB: www.mysql.com -- MySQL Cluster Mailing List For list archives: http://lists.mysql.com/cluster To unsubscribe: http://lists.mysql.com/cluster?unsub=lists@pantek.comReceived on Fri Aug 17 12:12:57 2007
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