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https://issues.apache.org/jira/browse/SPARK-32118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17810776#comment-17810776
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xichenglin commented on SPARK-32118:
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Why does spark3 have this problem, but spark2 does not? spark2 does not use
read-write locks
> Use fine-grained read write lock for each database in HiveExternalCatalog
> -------------------------------------------------------------------------
>
> Key: SPARK-32118
> URL: https://issues.apache.org/jira/browse/SPARK-32118
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0, 3.1.0
> Reporter: Lantao Jin
> Priority: Major
>
> In HiveExternalCatalog, all metastore operations are synchronized by a same
> object lock. In a heavy traffic Spark thriftserver or Spark Driver, users's
> queries may be stuck by any a long operation. For example, if a user is
> accessing a table which contains mass partitions, the operation
> loadDynamicPartitions() holds the object lock for a long time. All queries
> are blocking to wait for the lock.
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