Hi Roman,
Yes, you're right - OSDs list all objects during peering and take the latest full version of each object. Full version is a version that has at least min_size parts for XOR/EC, or any version for replicated setups which is OK because writes are atomic. If there is a newer "committed" ("stabilized") version of the object, but it doesn't have sufficient number of parts, the object is marked as incomplete.
By the way, did you receive my reply that I sent directly to your email? - it could've ended up in spam because yourcmc.ru is my own mail server.
> Hi Vitaliy,
>
> Awesome what you did. I like the minimalistic approach focused on
> performance very much. A long way you've passed implementing the
> whole stack from client to storage.
>
> Could you please describe peering process and object recovery in more
> details? You write in the README that there is no PGLog in your
> storage. After a brief glance into osd_ops.h and blockstore_impl.cpp I
> see there is a 'version' field. I can assume that every object is
> marked with a version and recovery happens taking the whole up-to-date
> object, right?
>
> --
> Roman
>
> On 2020-09-23 00:44, vitalif@xxxxxxxxxx wrote:
>
>> Hi!
>> After almost a year of development in my spare time I present my own
>> software-defined block storage system: Vitastor - https://vitastor.io
>> I designed it similar to Ceph in many ways, it also has Pools, PGs,
>> OSDs, different coding schemes, rebalancing and so on. However it's
>> much simpler and much faster. In a test cluster with SATA SSDs it
>> achieved Q1T1 latency of 0.14ms which is especially great compared to
>> Ceph RBD's 1ms for writes and 0.57ms for reads. In an "iops
>> saturation" parallel load benchmark it reached 895k read / 162k write
>> iops, compared to Ceph's 480k / 100k on the same hardware, but the
>> most interesting part was CPU usage: Ceph OSDs were using 40 CPU cores
>> out of 64 on each node and Vitastor was only using 4.
>> Of course it's an early pre-release which means that, for example, it
>> lacks snapshot support and other useful features. However the base is
>> finished - it works and runs QEMU VMs. I like the design and I plan to
>> develop it further.
>> There are more details in the README file which currently opens from
>> the domain https://vitastor.io
>> Sorry if it was a bit off-topic, I just thought it could be
>> interesting for you :)
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