Apache Spark commented on SPARK-23275:

User 'liufengdb' has created a pull request for this issue:

> hive/tests have been failing when run locally on the laptop (Mac) with OOM 
> ---------------------------------------------------------------------------
>                 Key: SPARK-23275
>                 URL: https://issues.apache.org/jira/browse/SPARK-23275
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.3.1
>            Reporter: Dilip Biswal
>            Assignee: Dilip Biswal
>            Priority: Major
>             Fix For: 2.3.0
> hive tests have been failing when they are run locally (Mac Os)  after a 
> recent change in the trunk. After running the tests for some time, the test 
> fails with OOM with  Error: unable to create new native thread. 
> I noticed the thread count goes all the way up to 2000+ after which we start 
> getting these OOM errors. Most of the threads seem to be related to the 
> connection pool in hive metastore (BoneCP-xxxxx-xxxx ). This behaviour change 
> is happening after we made the following change to HiveClientImpl.reset()
> {code}
>  def reset(): Unit = withHiveState {
>     try {
>       // code
>     } finally {
>       runSqlHive("USE default")  ===> this is causing the issue
>     }
> {code}
> I am proposing to temporarily back-out part of a fix made to address 
> SPARK-23000 to resolve this issue while we work-out the exact reason for this 
> sudden increase in thread counts.

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