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Posted to issues-all@impala.apache.org by "Quanlong Huang (Jira)" <ji...@apache.org> on 2020/06/23 01:32:00 UTC
[jira] [Commented] (IMPALA-7933) Consider using read-write locks
for partial fetch requests.
[ https://issues.apache.org/jira/browse/IMPALA-7933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17142519#comment-17142519 ]
Quanlong Huang commented on IMPALA-7933:
----------------------------------------
I think this is critical when query concurreny is high. Maybe we need to refactor the table lock before enabling LocalCatalog by default.
cc [~vihangk1]
> Consider using read-write locks for partial fetch requests.
> -----------------------------------------------------------
>
> Key: IMPALA-7933
> URL: https://issues.apache.org/jira/browse/IMPALA-7933
> Project: IMPALA
> Issue Type: Sub-task
> Components: Catalog
> Affects Versions: Impala 3.1.0
> Reporter: Bharath Vissapragada
> Priority: Critical
> Labels: catalog-v2
>
> Partial table fetches currently use an exclusive lock. Switch to a read-write lock instead?
> {code}
> // TODO(todd): consider a read-write lock here.
> table.getLock().lock();
> try {
> return table.getPartialInfo(req);
> } finally {
> table.getLock().unlock();
> }
> {code}
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