[
https://issues.apache.org/jira/browse/IGNITE-20895?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Alexey Scherbakov updated IGNITE-20895:
---------------------------------------
Labels: ignite-3 (was: )
> Optimize hierarchy lock manager
> -------------------------------
>
> Key: IGNITE-20895
> URL: https://issues.apache.org/jira/browse/IGNITE-20895
> Project: Ignite
> Issue Type: Improvement
> Affects Versions: 3.0
> Reporter: Alexey Scherbakov
> Priority: Major
> Labels: ignite-3
> Fix For: 3.0
>
>
> Recently a (not very efficient) parentLockManager [1]was introduced to
> handle hierarchy (coarse-grained) locks.
> Currently it's only purpose is to provide strict serializability during full
> table scans, which happed very rarely.
> It comes at the cost of acquiring additional lock on each update op. IS locks
> are never used at all.
> It should be improved. Possible optimizations:
> # Get rid of hierarchy locks and instead scan the primary index for table
> scane.
> # Replace lock queuing for IS,IX locks with counters. This prevents waiting,
> but is looks ok for this kind of locks. Only stronger locks should be allowed
> to wait.
> [1] org.apache.ignite.internal.tx.impl.HeapLockManager#parentLockManager
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
