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From "Aihua Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12541) Using CombineHiveInputFormat with the origin inputformat SymbolicTextInputFormat ,it will get a wrong result
Date Thu, 10 Dec 2015 15:18:10 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15051111#comment-15051111
] 

Aihua Xu commented on HIVE-12541:
---------------------------------

[~wisgood] I checked the patch. Are you saying if the symbolic path is regex, then it will
give incorrect result? Or even it's a regular symbolic path per line, it will give an incorrect
result? 

I tried the regular case with CombineHiveInputFormat format (which is actually by default),
and seems to work fine. Can you give a repro step if this is the case?

If you are talking about the regex in the symbolic path, then that's a new feature which we
are not handling right now.

Can you clarify?



> Using CombineHiveInputFormat with the origin inputformat  SymbolicTextInputFormat  ,it
will get a wrong result
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-12541
>                 URL: https://issues.apache.org/jira/browse/HIVE-12541
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.14.0, 1.2.0, 1.2.1
>            Reporter: Xiaowei Wang
>            Assignee: Xiaowei Wang
>             Fix For: 1.2.1
>
>         Attachments: HIVE-12541.1.patch
>
>
> Table desc :
> {noformat}
> CREATE External TABLE `symlink_text_input_format`(
>   `key` string,
>   `value` string)
> ROW FORMAT SERDE
>   'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'
> STORED AS INPUTFORMAT
>   'org.apache.hadoop.hive.ql.io.SymlinkTextInputFormat'
> OUTPUTFORMAT
>   'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'
> LOCATION
>   'viewfs://nsX/user/hive/warehouse/symlink_text_input_format'  
> {noformat}
> There is a link file in the dir '/user/hive/warehouse/symlink_text_input_format' ,  
the content of the link file is 
> {noformat}
>  viewfs://nsx/tmp/symlink* 
> {noformat}
> it contains one path ,and the path contains a regex!
> Execute the sql : 
> {noformat}
> set hive.rework.mapredwork = true ;
> set hive.input.format=org.apache.hadoop.hive.ql.io.CombineHiveInputFormat;
> set mapred.min.split.size.per.rack= 0 ;
> set mapred.min.split.size.per.node= 0 ;
> set mapred.max.split.size= 0 ;
> select count(*) from  symlink_text_input_format ;
> {noformat}
> It will get wrong result :0 
> At the same time ,I add a test case in the patch.



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