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https://issues.apache.org/jira/browse/LENS-1251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15403388#comment-15403388
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Amareshwari Sriramadasu commented on LENS-1251:
-----------------------------------------------
Logs for the same :
{noformat}
lensserver.log.2015-12-15.38:15 Dec 2015 09:57:34
[b3708823-80bb-4e9e-8802-aa8cfc515426] [QuerySubmitter] INFO
org.apache.lens.driver.hive.HiveDriver - New hive session for user: user1 ,
lens session: 389498de-016d-4b66-b2f5-51663b6f28ce.db1 hive session handle:
9e7edb6b-a851-403c-83f8-739e1d1e5417
lensserver.log.2015-12-15.38:15 Dec 2015 09:57:34
[b3708823-80bb-4e9e-8802-aa8cfc515426] [QuerySubmitter] INFO
org.apache.lens.server.query.QueryExecutionServiceImpl - No resources to
restore for session 389498de-016d-4b66-b2f5-51663b6f28ce
lensserver.log.2015-12-15.38:15 Dec 2015 09:57:34
[b3708823-80bb-4e9e-8802-aa8cfc515426] [QuerySubmitter] INFO
org.apache.lens.server.query.QueryExecutionServiceImpl - Added resource to hive
driver for session 389498de-016d-4b66-b2f5-51663b6f28ce cmd: add jar
file:///home/lens/dbresources/db1/x.jar
lensserver.log.2015-12-15.38:15 Dec 2015 09:57:34
[b3708823-80bb-4e9e-8802-aa8cfc515426] [QuerySubmitter] INFO
org.apache.lens.server.query.QueryExecutionServiceImpl - Added resource to hive
driver for session 389498de-016d-4b66-b2f5-51663b6f28ce cmd: add jar
file:///home/lens/dbresources/db1/y.jar
lensserver.log.2015-12-15.38:15 Dec 2015 09:57:34
[b3708823-80bb-4e9e-8802-aa8cfc515426] [QuerySubmitter] INFO
org.apache.lens.server.query.QueryExecutionServiceImpl - Added resource to hive
driver for session 389498de-016d-4b66-b2f5-51663b6f28ce cmd: add jar
file:///home/lens/dbresources/db1/lz.jar
lensserver.log.2015-12-15.38:15 Dec 2015 09:57:34
[b3708823-80bb-4e9e-8802-aa8cfc515426] [QuerySubmitter] INFO
org.apache.lens.server.query.QueryExecutionServiceImpl - Adding pending 0
session resources for session 389498de-016d-4b66-b2f5-51663b6f28ce for database
db1
{noformat}
Upon new session in hive :
{noformat}
lensserver.log.2015-12-16.43:16 Dec 2015 22:44:24
[488fab1c-d2dd-4cfa-ad76-b93692cbd669] [QuerySubmitter] INFO
org.apache.lens.server.query.QueryExecutionServiceImpl - No need to add DB
resources for session: 389498de-016d-4b66-b2f5-51663b6f28ce db= db1
lensserver.log.2015-12-16.43:16 Dec 2015 22:44:24
[488fab1c-d2dd-4cfa-ad76-b93692cbd669] [QuerySubmitter] INFO
org.apache.lens.server.query.QueryExecutionServiceImpl - Adding pending 0
session resources for session 389498de-016d-4b66-b2f5-51663b6f28ce for database
db1
lensserver.log.2015-12-16.43:16 Dec 2015 22:44:24
[488fab1c-d2dd-4cfa-ad76-b93692cbd669] [QuerySubmitter] INFO
org.apache.lens.driver.hive.HiveDriver - New hive session for user: user1 ,
lens session: 389498de-016d-4b66-b2f5-51663b6f28ce.db1 hive session handle:
9642959e-6b8a-4986-a2f7-99e3635c5d03
lensserver.log.2015-12-16.43:16 Dec 2015 22:44:24
[488fab1c-d2dd-4cfa-ad76-b93692cbd669] [QuerySubmitter] INFO
org.apache.lens.server.query.QueryExecutionServiceImpl - No resources to
restore for session 389498de-016d-4b66-b2f5-51663b6f28ce
{noformat}
> Hive server restart without lens server restart results in
> ClassNotFoundException sometimes
> -------------------------------------------------------------------------------------------
>
> Key: LENS-1251
> URL: https://issues.apache.org/jira/browse/LENS-1251
> Project: Apache Lens
> Issue Type: Bug
> Components: server
> Reporter: Amareshwari Sriramadasu
> Assignee: Amareshwari Sriramadasu
>
> We have seen the following scenario in production :
> - Restart hive server without restarting lens server.
> - DB resources are not added properly by lens server to existing hive
> sessions - which results in ClassNotFoundException for the classes used in
> the queries later.
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