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From "Bing Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13850) File name conflict when have multiple INSERT INTO queries running in parallel
Date Wed, 08 Jun 2016 14:49:20 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15320675#comment-15320675
] 

Bing Li commented on HIVE-13850:
--------------------------------

Hi, [~ashutoshc]
Thank you for your comments. 
Yes, you're right. The issue hasn't been resolved by naming the target file with timestamp.
We ran into it again...

We tried to set the following properties, but still got the error. 
Hive.support.concurrency -> true                                        
Hive.txn.manager -> org.apache.hadoop.hive.ql.lockmgr.DbTxnManager    

Are there any other properties required?

Thank you.

> File name conflict when have multiple INSERT INTO queries running in parallel
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-13850
>                 URL: https://issues.apache.org/jira/browse/HIVE-13850
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 1.2.1
>            Reporter: Bing Li
>            Assignee: Bing Li
>         Attachments: HIVE-13850-1.2.1.patch
>
>
> We have an application which connect to HiveServer2 via JDBC.
> In the application, it executes "INSERT INTO" query to the same table.
> If there are a lot of users running the application at the same time. Some of the INSERT
could fail.
> The root cause is that in Hive.checkPaths(), it uses the following method to check the
existing of the file. But if there are multiple inserts running in parallel, it will led to
the conflict.
> for (int counter = 1; fs.exists(itemDest) || destExists(result, itemDest); counter++)
{
>               itemDest = new Path(destf, name + ("_copy_" + counter) + filetype);
>             }
> The Error Message
> ===========================
> In hive log,
> org.apache.hadoop.hive.ql.metadata.HiveException: copyFiles: error      
> while moving files!!! Cannot move hdfs://node:8020/apps/hive/warehouse/met          
                             
> adata.db/scalding_stats/.hive-staging_hive_2016-05-10_18-46-            
> 23_642_2056172497900766879-3321/-ext-10000/000000_0 to hdfs://node:8020/apps/hive   
                              
> /warehouse/metadata.db/scalding_stats/000000_0_copy_9014                
>         at org.apache.hadoop.hive.ql.metadata.Hive.copyFiles(Hive.java: 
> 2719)                                                                   
>         at org.apache.hadoop.hive.ql.metadata.Hive.loadTable(Hive.java: 
> 1645)          
>                                                         
> In hadoop log, 
> WARN  hdfs.StateChange (FSDirRenameOp.java:     
> unprotectedRenameTo(174)) - DIR* FSDirectory.unprotectedRenameTo:       
> failed to rename /apps/hive/warehouse/metadata.db/scalding_stats/.hive- 
> staging_hive_2016-05-10_18-46-23_642_2056172497900766879-3321/-ext-     
> 10000/000000_0 to /apps/hive/warehouse/metadata.                        
> db/scalding_stats/000000_0_copy_9014 because destination exists



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