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https://issues.apache.org/jira/browse/HIVE-7307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049066#comment-14049066
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Alan Gates commented on HIVE-7307:
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[~ted_yu], not sure why we should be synchronizing calls to connPool. Are you
worried that they are not thread safe?
> Lack of synchronization for TxnHandler#getDbConn()
> --------------------------------------------------
>
> Key: HIVE-7307
> URL: https://issues.apache.org/jira/browse/HIVE-7307
> Project: Hive
> Issue Type: Bug
> Reporter: Ted Yu
> Priority: Minor
>
> TxnHandler#getDbConn() accesses connPool without holding lock on
> TxnHandler.class
> {code}
> Connection dbConn = connPool.getConnection();
> dbConn.setAutoCommit(false);
> {code}
> null check should be performed on the return value, dbConn.
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