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https://issues.apache.org/jira/browse/HIVE-14296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15390272#comment-15390272
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Naveen Gangam edited comment on HIVE-14296 at 7/22/16 10:06 PM:
----------------------------------------------------------------
In-corporating the feedback from the review.
1) I removed the counter that tracks the session count. Instead am using the
SessionManager.getOpenSessionCount()
2) The log record is now logged from the SessionManager.openSession() and
closeSession() instead. This ensures more consistent counts in the logs.
was (Author: ngangam):
In-corporating the feedback from the review.
> Session count is not decremented when HS2 clients do not shutdown cleanly.
> --------------------------------------------------------------------------
>
> Key: HIVE-14296
> URL: https://issues.apache.org/jira/browse/HIVE-14296
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 2.0.0
> Reporter: Naveen Gangam
> Assignee: Naveen Gangam
> Attachments: HIVE-14296.2.patch, HIVE-14296.patch
>
>
> When a JDBC client like beeline abruptly disconnects from HS2, the session
> gets closed on the serverside but the session count reported in the logs is
> incorrect. It never gets decremented.
> For example, I created 6 connections from the same instance of beeline to HS2.
> {code}
> 2016-07-20T15:05:17,987 INFO [HiveServer2-Handler-Pool: Thread-40]
> thrift.ThriftCLIService: Opened a session SessionHandle
> [28b225ee-204f-4b3e-b4fd-0039ef8e276e], current sessions: 1
> .....
> 2016-07-20T15:05:24,239 INFO [HiveServer2-Handler-Pool: Thread-45]
> thrift.ThriftCLIService: Opened a session SessionHandle
> [1d267de8-ff9a-4e76-ac5c-e82c871588e7], current sessions: 2
> .....
> 2016-07-20T15:05:25,710 INFO [HiveServer2-Handler-Pool: Thread-50]
> thrift.ThriftCLIService: Opened a session SessionHandle
> [04d53deb-8965-464b-aa3f-7042304cfb54], current sessions: 3
> .....
> 2016-07-20T15:05:26,795 INFO [HiveServer2-Handler-Pool: Thread-55]
> thrift.ThriftCLIService: Opened a session SessionHandle
> [b4bb8b86-74e1-4e3c-babb-674d34ad1caf], current sessions: 4
> 2016-07-20T15:05:28,160 INFO [HiveServer2-Handler-Pool: Thread-60]
> thrift.ThriftCLIService: Opened a session SessionHandle
> [6d3c3ed9-fadb-4673-8c15-3315b7e2995d], current sessions: 5
> .....
> 2016-07-20T15:05:29,136 INFO [HiveServer2-Handler-Pool: Thread-65]
> thrift.ThriftCLIService: Opened a session SessionHandle
> [88b630c0-f272-427d-8263-febfe2222f8d], current sessions: 6
> {code}
> When I CNTRL-C the beeline process, in the HS2 logs I see
> {code}
> 2016-07-20T15:11:37,858 INFO [HiveServer2-Handler-Pool: Thread-55]
> thrift.ThriftCLIService: Session disconnected without closing properly.
> 2016-07-20T15:11:37,858 INFO [HiveServer2-Handler-Pool: Thread-40]
> thrift.ThriftCLIService: Session disconnected without closing properly.
> 2016-07-20T15:11:37,858 INFO [HiveServer2-Handler-Pool: Thread-65]
> thrift.ThriftCLIService: Session disconnected without closing properly.
> 2016-07-20T15:11:37,858 INFO [HiveServer2-Handler-Pool: Thread-60]
> thrift.ThriftCLIService: Session disconnected without closing properly.
> 2016-07-20T15:11:37,859 INFO [HiveServer2-Handler-Pool: Thread-50]
> thrift.ThriftCLIService: Session disconnected without closing properly.
> 2016-07-20T15:11:37,859 INFO [HiveServer2-Handler-Pool: Thread-45]
> thrift.ThriftCLIService: Session disconnected without closing properly.
> 2016-07-20T15:11:37,859 INFO [HiveServer2-Handler-Pool: Thread-55]
> thrift.ThriftCLIService: Closing the session: SessionHandle
> [b4bb8b86-74e1-4e3c-babb-674d34ad1caf]
> 2016-07-20T15:11:37,859 INFO [HiveServer2-Handler-Pool: Thread-40]
> thrift.ThriftCLIService: Closing the session: SessionHandle
> [28b225ee-204f-4b3e-b4fd-0039ef8e276e]
> 2016-07-20T15:11:37,859 INFO [HiveServer2-Handler-Pool: Thread-65]
> thrift.ThriftCLIService: Closing the session: SessionHandle
> [88b630c0-f272-427d-8263-febfe2222f8d]
> 2016-07-20T15:11:37,859 INFO [HiveServer2-Handler-Pool: Thread-60]
> thrift.ThriftCLIService: Closing the session: SessionHandle
> [6d3c3ed9-fadb-4673-8c15-3315b7e2995d]
> 2016-07-20T15:11:37,859 INFO [HiveServer2-Handler-Pool: Thread-45]
> thrift.ThriftCLIService: Closing the session: SessionHandle
> [1d267de8-ff9a-4e76-ac5c-e82c871588e7]
> 2016-07-20T15:11:37,859 INFO [HiveServer2-Handler-Pool: Thread-50]
> thrift.ThriftCLIService: Closing the session: SessionHandle
> [04d53deb-8965-464b-aa3f-7042304cfb54]
> {code}
> The next time I connect to HS2 via beeline, I see
> {code}
> 2016-07-20T15:14:33,679 INFO [HiveServer2-Handler-Pool: Thread-50]
> thrift.ThriftCLIService: Client protocol version: HIVE_CLI_SERVICE_PROTOCOL_V8
> 2016-07-20T15:14:33,710 INFO [HiveServer2-Handler-Pool: Thread-50]
> session.SessionState: Created HDFS directory:
> /tmp/hive/hive/d47759e8-df3a-4504-9f28-99ff5247352c
> 2016-07-20T15:14:33,725 INFO [HiveServer2-Handler-Pool: Thread-50]
> session.SessionState: Created local directory:
> /var/folders/_3/0w477k4j5bjd6h967rw4vflw0000gp/T/ngangam/d47759e8-df3a-4504-9f28-99ff5247352c
> 2016-07-20T15:14:33,735 INFO [HiveServer2-Handler-Pool: Thread-50]
> session.SessionState: Created HDFS directory:
> /tmp/hive/hive/d47759e8-df3a-4504-9f28-99ff5247352c/_tmp_space.db
> 2016-07-20T15:14:33,737 INFO [HiveServer2-Handler-Pool: Thread-50]
> session.HiveSessionImpl: Operation log session directory is created:
> /var/folders/_3/0w477k4j5bjd6h967rw4vflw0000gp/T/ngangam/operation_logs/d47759e8-df3a-4504-9f28-99ff5247352c
> 2016-07-20T15:14:33,737 INFO [HiveServer2-Handler-Pool: Thread-50]
> thrift.ThriftCLIService: Opened a session SessionHandle
> [d47759e8-df3a-4504-9f28-99ff5247352c], current sessions: 7
> {code}
> So while the sessions itself are closed and cleaned up, the session count
> reported is not accurate.
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