[Herddb-dev] New Diskless Cluster Mode v2

[Enrico Olivelli]

Hi all,
we have committed option 2: "create default tablespace 'herd' with replica
= '*', storageMode: bookkeeper and maxleaderinactivitytimeout=30 seconds"
(but with 1 minute of timeout)

I feel we are ready for cutting 0.19.0,

I would like to see an official docker image, but we can make it for 0.19.1

thoughts ?


Enrico

Il giorno lun 10 ago 2020 alle ore 15:28 Enrico Olivelli <
eolivelli at gmail.com> ha scritto:

> Hi all,
> I have created a PR for Diskless Cluster Mode v2
> https://github.com/diennea/herddb/pull/676
>
> See the description for the details.
>
> This change introduces the ability to set '*' as 'replicas' for a
> tablespace, meaning that every node is automatically a good replica for the
> tablespace.
>
> This makes sense in Diskless Cluster Mode v2 because in that mode only one
> node works, the leader, and followers are stand-by only and do not store
> additional data.
>
> As a follow up I would like to work in two directions:
> - make the cluster mode: 'traditional' vs 'diskless' configurable
> per-tablespace and not per cluster, I would call it 'storageMode: file vs
> bookkeeper'
> - create default tablespace 'herd' with replica = '*', storageMode:
> bookkeeper and maxleaderinactivitytimeout=30 seconds
>
> with these two features the tablespace 'herd' will be always available,
> and this will ease working in an HerdDB cluster, because by default all of
> the queries, event the ones about metadata (systablespaces, sysnodes.....)
> are by default routed to the server for 'herd' tablespace.
>
> An alternative would be to add a new virtualtablespace, like  'metadata'
> that cannot contain tables and that it is assigned to every node
> (replica=*,  maxleaderinactivitytimeout=30 seconds)
>
> I would like to get this stuff in for 0.19.0, as I am preparing for the
> ApacheCon talk, and we need to be more userfriendly
>
> Thoughts ?
> Enrico
>
>
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