[
https://issues.apache.org/jira/browse/IGNITE-19344?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Evgeny Stanilovsky updated IGNITE-19344:
----------------------------------------
Fix Version/s: 3.2
(was: 3.1)
> Generate unique txId suffix per node
> ------------------------------------
>
> Key: IGNITE-19344
> URL: https://issues.apache.org/jira/browse/IGNITE-19344
> Project: Ignite
> Issue Type: Improvement
> Reporter: Roman Puchkovskiy
> Priority: Major
> Labels: ignite-3
> Fix For: 3.2
>
>
> We need txId (transaction ID) to have the following properties:
> # Contain beginTs inside it so that we can extract beginTs from txId
> # txId must be globally unique
> # Its length must be 128 bits (to fit in UUID) - this requirement comes from
> the current implementation and it's not clear why exactly we need it
> Current approach is to construct txId as a concatenation of txId prefix (aka
> nodeId) and beginTs taken as HLC.now() on the node that generates the txId.
> txId prefix must be unique among all coordinators. If we make it unique among
> all nodes in the logical topology, this solves our problem.
> We need to design and implement a way to choose a unique txId prefix. We
> probably need to validate this value on join to make sure it's unique. On the
> generation, here are some ideas:
> # Use MAC address to generate the prefix (but MAC addresses are not unique;
> we not always have access to MAC address; more than one Ignite nodes might be
> started on the same machine; we need to hash the MAC to fit in 32 bits, so
> collisions may happen even with different MACs)
> # Use hash code from consistentId (this could lead to a necessity to change
> it by the user if a collision happens)
> # Generate txId prefix using a cluster-global cyclic 32 bit counter on join
> (the downside is that it looks like an additional ID [additional to
> consistentId])
> # Use the approach from the previous item to replace consistentId (and so
> remove consistentId from the system completely)
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
