Wednesday, 2017-10-04

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openstackgerritTom Barron proposed openstack/manila master: WIP: Use constants for microversion values  https://review.openstack.org/50915203:07
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bswartzganso tbarron: soft deletes are not only about auditing -- they're also faster18:12
bswartzganso: I agree it should be possible to query for deleted records or not as long as we continue with soft deletes18:13
bswartzhowever I'm not sure why anyone would want that18:14
bswartzwhat is the use case for loading deleted driver private share data18:14
tbarronif there's no use case (and I don't think there is) for loading deleted driver share private share data then the only justification is speedup when deleting private share data18:16
tbarronis that an optimization that we care about?18:17
bswartzconsistency is often more valuable than optimization18:17
tbarronthe cost here is proportional to the number of records rather than its size, right?18:17
bswartzwhich cost18:18
tbarronbswartz: ack on consistency, which was a point in the earlier conversation18:18
tbarronspeed cost, your point on soft deletes18:18
bswartzI have no data to back that up18:18
bswartzon older SQL databases, updates were always dramatically faster than deletes18:19
tbarronwell I think soft deletes are a speed optimization too (w/o current data)18:19
tbarronbut I think the number of records deleted matter18:19
tbarronand suspect that with driver private data that number is usually one18:19
bswartzthe downside is that you need to index on the deleted column to no slow down your queries as garbage accumulates18:19
tbarronsince we load k-v pairs inside a single record18:20
tbarronso I think the consistency argument (we always do soft deletes, even if in some cases there is no speedup and no audit need) is more important18:20
tbarronAnd that that consistency argument could be met by "but it makes this code ugly (when we fix the bug ganso pointed to) and we can add in-code comment and devref doc so no one gets confused18:21
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tbarronBut I'm not dug in on this, just explaining my reaction to ganso's posing of the issue.18:22
tbarronganso was of course posting rather than posing18:22
* tbarron is not accusing ganso of being a *poser*18:23
gansotbarron: yea I am actually confused by that last statemtn18:23
bswartzwhat is the bug we're trying to fix?18:24
bswartzdoes someone care that listing deleted records is broken?18:24
gansobswartz: lemme grab launchpad link for you18:24
tbarronganso: don't worry about it, but a "poser" would be kinda like a faker18:24
gansotbarron: yea I was confused if you were saying I was a poser or not lol18:25
tbarronganso: just a typo18:25
ganso#link https://bugs.launchpad.net/manila/+bug/172112318:25
openstackLaunchpad bug 1721123 in Manila "cannot update previously deleted drivers_private_storage entries" [Undecided,New] - Assigned to Rodrigo Barbieri (rodrigo-barbieri2010)18:25
gansobswartz: ^18:25
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gansobswartz: listing deleted records is not broken18:45
gansobswartz: updating deleting records (undeleting them, which is how drivers_private_storage was initially designed) is broken18:45
gansos/updating deleting/updating deleted18:45
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openstackgerritOpenStack Proposal Bot proposed openstack/manila-ui master: Imported Translations from Zanata  https://review.openstack.org/50959819:11
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bswartzI see20:50
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