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From "Steven Wong (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1816) Reporting of (seemingly inconsequential) transport exception has major impact on performance
Date Tue, 30 Nov 2010 22:20:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965457#action_12965457
] 

Steven Wong commented on HIVE-1816:
-----------------------------------

HiveResultSet stops using DynamicSerDe in 0.7, so this stack trace should not be possible
starting in 0.7.


> Reporting of (seemingly inconsequential) transport exception has major impact on performance
> --------------------------------------------------------------------------------------------
>
>                 Key: HIVE-1816
>                 URL: https://issues.apache.org/jira/browse/HIVE-1816
>             Project: Hive
>          Issue Type: Improvement
>          Components: Drivers
>    Affects Versions: 0.5.0
>         Environment: Custom Java application using the Hive JDBC driver to connect to
a Hive server, execute a Hive query and process the results. 
>            Reporter: Guy le Mar
>            Priority: Minor
>
> During the process of executing a hive query and then fetching the results, the following
stack track is continually output to seterr.
> For the query I executed, 47Mb of this text was generated. As a consequence, the performance
of the application itself suffered.
> (Redirecting stderr to file halved the time it took my application to fetch the results
- from 2 minutes down to 70 sec.)
> Note, this also occurs if you use an application such as SQuirrel SQL (http://www.squirrelsql.org)
to execute a Hive query using the Hive JDBC driver.
> The stack trace that is repeatedly reported is...
> org.apache.thrift.transport.TTransportException
> 	at org.apache.thrift.transport.TIOStreamTransport.read(TIOStreamTransport.java:132)
> 	at org.apache.hadoop.hive.serde2.thrift.TCTLSeparatedProtocol$SimpleTransportTokenizer.fillTokenizer(TCTLSeparatedProtocol.java:215)
> 	at org.apache.hadoop.hive.serde2.thrift.TCTLSeparatedProtocol$SimpleTransportTokenizer.<init>(TCTLSeparatedProtocol.java:210)
> 	at org.apache.hadoop.hive.serde2.thrift.TCTLSeparatedProtocol.internalInitialize(TCTLSeparatedProtocol.java:336)
> 	at org.apache.hadoop.hive.serde2.thrift.TCTLSeparatedProtocol.initialize(TCTLSeparatedProtocol.java:417)
> 	at org.apache.hadoop.hive.serde2.dynamic_type.DynamicSerDe.initialize(DynamicSerDe.java:94)
> 	at org.apache.hadoop.hive.jdbc.HiveResultSet.initDynamicSerde(HiveResultSet.java:117)
> 	at org.apache.hadoop.hive.jdbc.HiveResultSet.<init>(HiveResultSet.java:74)
> 	at org.apache.hadoop.hive.jdbc.HiveStatement.executeQuery(HiveStatement.java:178)
> 	at com.quest.orahive.HiveJdbcClient.main(HiveJdbcClient.java:117)

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