[jira] [Assigned] (SPARK-34573) SQLConf sqlConfEntries map has a global lock, should not lock on get

["Apache Spark (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-34573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-34573:
------------------------------------

    Assignee:     (was: Apache Spark)

> SQLConf sqlConfEntries map has a global lock, should not lock on get
> --------------------------------------------------------------------
>
>                 Key: SPARK-34573
>                 URL: https://issues.apache.org/jira/browse/SPARK-34573
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.4.7, 3.0.2
>            Reporter: Gabriele Nizzoli
>            Priority: Major
>
> SQLConf object has a sqlConfEntries map, which has a global lock (since it implements a Collections.synchronizedMap).
>  Every operation (like get or set) blocks the full object.
>  Concurrent threads may wait on lock.
> An example is the DatatType.sameType method, that queries SQLConf entries map:
> {code:scala}
> if (SQLConf.get.caseSensitiveAnalysis) 
>  ...
> {code}
> If this data type check is run in a custom piece of code on an executor with multiple cores (eg: 40), then a lot of time will be lost waiting on the lock.
>  An easy fix is to use the a ConcurrentHashMap that does not lock on read SQLConf.get): " ... retrieval operations do not entail locking ..."
> NOTE: originally discovered by benson.h@taboola.com



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