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Re: [RFC v2] migration: Add migrate-set-bitmap-node-mapping
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From: |
Max Reitz |
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Subject: |
Re: [RFC v2] migration: Add migrate-set-bitmap-node-mapping |
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Date: |
Thu, 14 May 2020 11:09:49 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 |
On 13.05.20 22:09, Vladimir Sementsov-Ogievskiy wrote:
[...]
> 1. So, you decided to make only node-mapping, not bitmap-mapping, so we
> can't rename bitmaps in-flight and can't migrate bitmaps from one node
> to several and visa-versa. I think it's OK, nothing good in such
> possibilities, and this simplifies things.
On second thought, I wonder whether it would be useful to migrate
bitmaps from multiple nodes to a single one. But probably not, this
would only make sense for filters, really, and in such a case the
bitmaps should probably just be moved prior to migration.
(And I can’t imagine any other case. When flattening backing chains,
the bitmaps from the dropped layers basically become useless.)
Max
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