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https://issues.apache.org/jira/browse/HIVE-12517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032164#comment-15032164
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Yongzhi Chen commented on HIVE-12517:
-------------------------------------
+1
> Beeline's use of failed connection(s) causes failures and leaks.
> ----------------------------------------------------------------
>
> Key: HIVE-12517
> URL: https://issues.apache.org/jira/browse/HIVE-12517
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Naveen Gangam
> Assignee: Naveen Gangam
> Priority: Minor
> Fix For: 2.0.0
>
> Attachments: HIVE-12517.patch
>
>
> Beeline adds a bad connection(s) to the connection list and makes it the
> current connection, so any subsequent queries will attempt to use this bad
> connection and will fail. Even a "!close" would not work.
> 1) all queries fail unless !go is used.
> 2) !closeall cannot close the active connections either.
> 3) !exit will exit while attempting to establish these inactive connections
> without closing the active connections. So this could hold up server side
> resources.
> {code}
> beeline> !connect jdbc:hive2://localhost:10000 hive1 hive1
> scan complete in 8ms
> Connecting to jdbc:hive2://localhost:10000
> Connected to: Apache Hive (version 2.0.0-SNAPSHOT)
> Driver: Hive JDBC (version 1.1.0-cdh5.7.0-SNAPSHOT)
> Transaction isolation: TRANSACTION_REPEATABLE_READ
> 0: jdbc:hive2://localhost:10000> !connect jdbc:hive2://localhost:10000 hive1
> hive1
> Connecting to jdbc:hive2://localhost:10000
> Connected to: Apache Hive (version 2.0.0-SNAPSHOT)
> Driver: Hive JDBC (version 1.1.0-cdh5.7.0-SNAPSHOT)
> Transaction isolation: TRANSACTION_REPEATABLE_READ
> 1: jdbc:hive2://localhost:10000> !connect jdbc:hive2://localhost:10000 hive1
> hive1
> Connecting to jdbc:hive2://localhost:10000
> Connected to: Apache Hive (version 2.0.0-SNAPSHOT)
> Driver: Hive JDBC (version 1.1.0-cdh5.7.0-SNAPSHOT)
> Transaction isolation: TRANSACTION_REPEATABLE_READ
> 2: jdbc:hive2://localhost:10000> !tables
> +------------+--------------+---------------------+-------------+----------+--+
> | TABLE_CAT | TABLE_SCHEM | TABLE_NAME | TABLE_TYPE | REMARKS |
> +------------+--------------+---------------------+-------------+----------+--+
> | | default | char_nested_1 | TABLE | NULL |
> | | default | src | TABLE | NULL |
> | | default | char_nested_struct | TABLE | NULL |
> | | default | src_thrift | TABLE | NULL |
> | | default | x | TABLE | NULL |
> +------------+--------------+---------------------+-------------+----------+--+
> 2: jdbc:hive2://localhost:10000> !list
> 3 active connections:
> #0 open jdbc:hive2://localhost:10000
> #1 open jdbc:hive2://localhost:10000
> #2 open jdbc:hive2://localhost:10000
> 2: jdbc:hive2://localhost:10000> !connect jdbc:hive2://localhost:11000 hive1
> hive1
> Connecting to jdbc:hive2://localhost:11000
> Error: Could not open client transport with JDBC Uri:
> jdbc:hive2://localhost:11000: java.net.ConnectException: Connection refused
> (state=08S01,code=0)
> 3: jdbc:hive2://localhost:11000 (closed)> !tables
> Error: Could not open client transport with JDBC Uri:
> jdbc:hive2://localhost:11000: java.net.ConnectException: Connection refused
> (state=08S01,code=0)
> 3: jdbc:hive2://localhost:11000 (closed)> !list
> 4 active connections:
> #0 open jdbc:hive2://localhost:10000
> #1 open jdbc:hive2://localhost:10000
> #2 open jdbc:hive2://localhost:10000
> #3 closed jdbc:hive2://localhost:11000
> 3: jdbc:hive2://localhost:11000 (closed)> !close
> Error: Could not open client transport with JDBC Uri:
> jdbc:hive2://localhost:11000: java.net.ConnectException: Connection refused
> (state=08S01,code=0)
> 3: jdbc:hive2://localhost:11000 (closed)> !closeall
> Error: Could not open client transport with JDBC Uri:
> jdbc:hive2://localhost:11000: java.net.ConnectException: Connection refused
> (state=08S01,code=0)
> 4: jdbc:hive2://localhost:11000 (closed)> !exit
> Error: Could not open client transport with JDBC Uri:
> jdbc:hive2://localhost:11000: java.net.ConnectException: Connection refused
> (state=08S01,code=0)
> Error: Could not open client transport with JDBC Uri:
> jdbc:hive2://localhost:11000: java.net.ConnectException: Connection refused
> (state=08S01,code=0)
> {code}
> The workaround is to use !go to set the current connection to a "good"
> connection.
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