Ceph Crimson Weekly, 20 Oct 2021

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From YouTube: Ceph Crimson/SeaStore 2021-10-20

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A

All right, let's get started.

A

Let's see the multi-device stuff merged last week, um what else uh working againstology to work with c-store uh chimney is also working in that and working on the cash? How are you uh joyhot? I just I think I found the bug in lower bound. So that's the first bug I think. um Okay, what did you do to reproduce it? If I might ask.

B

I just run it and uh yeah it crashes after eight or nine seconds makes sense.

A

This one- and this one at least, should be able to yeah. It should be able to make. It should be easy to make a unit test for this bug, at least so that'll be good.

A

There are probably other bugs in here better unit testing I'll try to do that. um That is it for me. How's it going.

C

uh I can use uh shanghai teams to solid test environment currently and uh figure out how to build the beam package for crimson ost, and I filmed the technology switch logger that I I saw. The system is set up and the printout and so to solve. The report error is that the there, the osd metadata is not written to the wireless fosd, uh this folder, so for the blue stone every metadata will write a copy to the uh to this folder to this directory.

C

um So so I just want to confirm with you and just as well c star. We we have we. uh We also need to support that feature right.

A

Yeah, I think so.

C

Since the self disc will separate a 100 megabits partition to for this, this folder will monitor that's.

A

How that works? Okay,.

C

Yeah yeah, so so that will mount to this uh directory and save the os metadata, and I think the deploy will check that folder and yeah.

A

That's perfect.

C

So I will writing. Add the code to write that folder for the ose metadata will write to the one called write metadata, both right to the root block and uh under the directory.

A

Yeah, that's perfect.

C

Okay, so that's all just uh doing the cody ended back.

A

Yeah for what it's worth, unless we run into something, that's like a problem, we're pretty much just going to mimic bluestore's file layout like bluester, does the same thing. We do. We take a block device and format it specially.

C

A

C

Sim partition right, like blue cell yeah,.

A

C

A

C

Is a one-handed megabits partition for this one.

A

Yeah exactly so, we might as well do the same thing. It's we're going to have to do all the same stuff. We're still going to need um tooling, to be able to detect and mount d store um block devices. So we may have used this. We may as well use the same tricks. Blue store is using that'll.

A

Yep, if we run into something that's like a problem. Well, that's when we'll have to figure something out, but I don't. I don't think we will. So I think it's gonna be fine.

A

A

D

Sorry keep forgetting that it mutes me on entrance or something after previewing me. It's not muted, uh I'm trying to build enough interfaces that I can actually do like a separate pg reactor or something and feed into like two of them from one messenger and then into a single object store, or you know, however, many numbers we want, um so that I can do more interesting things than just that, but I need interfaces first, that can speak the right kinds of primitives so trying to make that happen.

A

I have the following opinion about that: don't use the word reactor.

D

A

Sorry, uh it's not a problem. I'm I'm thinking ahead to needing to explain to people the difference between c-store c-stars.

D

Okay, yes, okay,.

A

Yeah all I had there yeah that makes.

D

Sense, nope good thought was the whole thing.

A

All right how's it going.

B

Last week I was still trying to see uh how my implementation of the sprite lfs strategy in sistor works um and at first I I can run it smoothly, but I found I found that uh the segment then the segment cleaner, just didn't clean quickly enough to catch up with the uh actual rights.

B

So I uh I increased uh the amount of data that the signal cleaner can reclaim during one gc cycle from one megabyte to uh 128, megabytes and uh ice came up and it came up with uh the the bug we we discussed yesterday.

A

Oh, that makes sense.

B

Yeah- and um uh I also uh uh there isn't also another uh issue that I met uh during the test- uh that is, we didn't handle uh right v. The function called uh correctly uh when the the actual extents tri uh we're trying to we're trying. We were trying to write uh yeah. This is the uh iov max threshold, uh so I submitted pr for it. uh That was all for me.

B

A

All right is there anything else.

A

All right have a good week, y'all.