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Posted to mapreduce-issues@hadoop.apache.org by "ramtin (JIRA)" <ji...@apache.org> on 2015/02/09 19:56:34 UTC
[jira] [Updated] (MAPREDUCE-6246) DBOutputFormat.java appending
extra semicolon to query which is incompatible with DB2
[ https://issues.apache.org/jira/browse/MAPREDUCE-6246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ramtin updated MAPREDUCE-6246:
------------------------------
Description:
In DBOutputFormat class there is constructQuery method that generates "INSERT INTO" statement with semicolon(;;)) at the end.
Semicolon is ANSI SQL-92 standard character for a statement terminator but this feature is disabled(OFF) as a default settings in IBM DB2.
Although by using -t we can turn it ON for db2. (http://www-01.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.admin.cmd.doc/doc/r0010410.html?cp=SSEPGG_9.7.0%2F3-6-2-0-2). But there are some products that already built on top of this default setting (OFF) so by turning ON this feature make them error prone.
I changed the current DBOutputFormat class by checking the product name from connection object to see if it is DB2 then generates "INSERT INTO" command without semicolon(;).
This technique is already used in DBInputFormat class for generating different "SELECT" statements for Oracle and MySQL databases.
was:
In DBOutputFormat class there is constructQuery method that generates "INSERT INTO" statement with semicolon(;) at the end.
Semicolon is ANSI SQL-92 standard character for a statement terminator but this feature is disabled(OFF) as a default settings in IBM DB2.
Although by using -t we can turn it ON for db2. (http://www-01.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.admin.cmd.doc/doc/r0010410.html?cp=SSEPGG_9.7.0%2F3-6-2-0-2). But there are some products that already built on top of this default setting (OFF) so by turning ON this feature make them error prone.
I changed the current DBOutputFormat class by checking the product name from connection object to see if it is DB2 then generates "INSERT INTO" command without semicolon(;).
This technique is already used in DBInputFormat class for generating different "SELECT" statements for Oracle and MySQL databases.
> DBOutputFormat.java appending extra semicolon to query which is incompatible with DB2
> -------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6246
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6246
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1, mrv2
> Affects Versions: 2.4.1
> Environment: OS: RHEL 5.x, RHEL 6.x, SLES 11.x
> Platform: xSeries, pSeries
> Browser: Firefox, IE
> Security Settings: No Security, Flat file, LDAP, PAM
> File System: HDFS, GPFS FPO
> Reporter: ramtin
> Assignee: ramtin
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> In DBOutputFormat class there is constructQuery method that generates "INSERT INTO" statement with semicolon(;;)) at the end.
> Semicolon is ANSI SQL-92 standard character for a statement terminator but this feature is disabled(OFF) as a default settings in IBM DB2.
> Although by using -t we can turn it ON for db2. (http://www-01.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.admin.cmd.doc/doc/r0010410.html?cp=SSEPGG_9.7.0%2F3-6-2-0-2). But there are some products that already built on top of this default setting (OFF) so by turning ON this feature make them error prone.
> I changed the current DBOutputFormat class by checking the product name from connection object to see if it is DB2 then generates "INSERT INTO" command without semicolon(;).
> This technique is already used in DBInputFormat class for generating different "SELECT" statements for Oracle and MySQL databases.
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